JPS5952464A - Disc record reproducer - Google Patents

Abstract

PURPOSE:To attain quick search, by shifting a pickup by a distance based on a distance data between the radius of the present position and that of the objective position of the pickup, in the reproduction of a disc on which a digital data is recorded. CONSTITUTION:The radius of a disc 140 of the present and the objective positions is calculated from the absolute address of the positions of a pickup 142 and the distance to shift the pickup is determined by obtaining the difference of the both. Then, the pulse number of a position detecting signal generating one pulse every time the pickup is shifted and the spot crosses one track is counted and when the shift distance of the pickup is equal to the said distance data, the shift is stopped. In this case, the pickup is shifted near the objective position based on the distance data produced from the absolute address of the present position and the objective position of the pickup 142, and then the pickup is shifted based on the distance data calculated from the absolute address of the present and the objective positions of the pickup produced by using the relative address.

Description

[Detailed description of the invention] [Technical field of the invention] This invention V, for example, a CD (optical connoct disc) system DAD (digital audio disc)
The present invention relates to a disc record playback device ++'j suitable for use in applications, and particularly to a search system for quickly selecting (cueing) desired data.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, PcM (-+rus code modulation) is being used to achieve as high fidelity reproduction as possible.
Digital recording and playback methods using technology are being adopted. In other words, this is called IT7J digital audio conversion, and the audio characteristics are independent of the characteristics of the recording medium and are far superior to those using conventional analog recording and playback methods. This is because it has been established in principle.

In this case, a system that uses a disk as a recording medium is called a DAD system, and optical, electrostatic, and mechanical recording and reproducing methods have been proposed. Even if this method is adopted, the playback device that embodies it is still required to be able to satisfy a high degree of control and performance that is not found in conventional methods. There is.

In other words, if we take the CD system as an example,
A transparent 4☆l fat disk with a diameter of 12 [rust] and a thickness of 1.2 [body] is coated with a metal thin film that forms a pattern (irregularities with different reflectances) corresponding to digital (PCM) data. A disk made of 500 to 200 [r, p.

m] is rotated at a variable rotational speed, and reproduced in a linear tracking manner from the inner circumferential side to the outer circumferential side using an optical pickup containing a semiconductor laser and a photoelectric conversion element.1. The disc has a track pitch of 1.6 [μm], and a huge amount of information is recorded in the grogram area (radius 25 to +81:wm+:), which can provide about 1 hour of stereo viewing even on one side. In addition, those index data etc. are stored in the lead-in area (
This can be easily seen from the fact that it is recorded within a radius of 23 to 25 m+).

However, this Jil? If there is a disk record player in 'C', 'l:M', the desired data (songs) from among the multiple data (songs) recorded in the program area will be output from the slot. ) It is said that this is an issue that needs to be solved urgently because nothing has been realized that can perform the so-called search function accurately and quickly.

[Purpose of the invention]

This invention has been made based on the above circumstances, and is capable of providing a quick and accurate search function with a simple configuration in a disc record playback device (i) that plays a disc on which digitized data is recorded. It is an object of the present invention to provide an extremely good disc record internal reproduction device a.

[Summary of the invention]

That is, in the present invention, a plurality of digital data obtained by converting an information signal into PCM are sequentially connected to the plurality of digital data in a time-wise manner. Is it a disc recorded with an absolute address obtained by adding j information and a relative address obtained by adding temporal information for each of the plurality of y''cc notations?
the digital data via an optical pickup;
In a disc record playback device that reads out an absolute address and a relative address, the target position fi:Z to which the pickup should be moved is set as the absolute address and the absolute address as the relative 'address of the digital data of the previous user. a setting means for converting the difference number between the absolute address set by the setting means and the absolute address read from the pickup into first distance data corresponding to the difference number, and moving the pickup to 1) the 1J destination position; The y conversion means of ε1゛S1 generates a drive signal for moving the pickup in the direction, and the difference component between the relative address set by the setting means and the relative address extracted from the pickup is converted into a corresponding Converting the distance r-= of 2 and converting the pitch 7° to the previous ml objective 6γli
'Move in the j direction. a second converting means for generating a driving signal 411, and a current 6', 1i (of the pickup);
switching means for selectively guiding the first and second distances 1) f+Itr-1) when the difference in distance between f and the target position is greater than or equal to a predetermined value; movement [i-detection means and movement h1-detection data outputted from the movement amount detection means and stop means for stopping the movement of the pickup in a state corresponding to the first and second distance data guided by the switching means, and the target position if- 'J' is designed to move the pickup quickly and accurately.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. First, the D of the CD system to which this invention is applied.
An outline of the AD playback device will be explained below.

In other words, Figure 1 shows a front external view, and 1 in the figure shows
Reference numeral 11 denotes a kangaroo jacket-type disk loading section provided on the front surface of the cabinet 1-0 so as to be openable and closable. And, on the left side of this disk loading section 11, there is a disk loading section! An eject (gJEcT) key 112 for opening/closing the A section and a power (POWER) key 113 for connecting/disconnecting the power supply are provided.

Further, on the upper right side of the disk loading section 1 horn, there is a display section 114 for making various displays, a reverse (RFV) key 115 for so-called pack word operation, and a fast forward (FF) key 116 for fast forward operation. A PLAY key 117 for play operation is also provided. Also in the middle row is Nex i
- Play (NEXT PLAY) key 118, repeat (REPEAT) key 119, and pause (PAUS)
E) A key 120 and a STOP key 12 are provided.

Similarly, in the lower row, 0, 1.2. ..., 9 number key 1
22 to 13, a memory read (MRgAD) key 132, a memory key 133, and a CLEAR key 134 are provided.

Then, the above-mentioned display section 114 displays
ECT) Display z14*z Search (SF:ARCH) Display 14b1 Error (ERROR) Display J14c.

REPEAT display J14d, MANUAL display 1-4e, auto play (A
UTO) indicator 1141. Memory (Hata MORY) display 114g and 8 channel memory indicator (MF
MORY INI) ICATOR) 174 h
A song tB (P, IITJSICA) display 1141 and a time (TIME) display 114j are provided.

In addition, the play (PLAY) key 117 and the pause (PA
During the USE ) key 120, you can also press the PLAY (PLA) key.
Y) Display 114k and PAUSE display z7
Noah 4T is provided.

Here, FIG. 2 shows the basic configuration of the electric circuit system of the CD-based DAD playback device shown in FIG. 1. That is, 140 in FIG. 2 is a disk, which is attached to the disk loading section 11 and connected to the disk motor 14 so that its rotational force is transmitted when the disk loading section 11 is closed.

Further, a pickup 142 is provided so as to intersect with the No. 1) recording surface of the disc 140. This pickup 142 is supported movably in the radial direction of the disk 140, and is supported by a pickup feed motor j.
It is moved by IIK power of 4 J. Incidentally, the upper ML big Azzo 142 is actually installed on the side of the disc motor 4 where several lines are marked (that is, the lower side of the disc (J 4 o ) in Fig. 2), but the upper ML big Azzo 142 is In the figure, for convenience, the picker 76142 is drawn above the disk 14θ.Although not shown in the figure, it is equipped with a laser emitting section, a beam splitter, a converging lens, a photoelectric conversion element, etc., and first irradiates from the laser emitting section. The laser beam is converged by a converging lens via a beam sifter and focused (spot) on the surface of the disk 140. Then, the laser beam is reflected depending on the presence or absence of pits on the disk 40, travels backward through the converging lens, and is guided by the beam splitter to the photoelectric conversion element.

To avoid this, the photoelectric conversion element outputs an electrical signal (hereinafter referred to as RF (number i)) corresponding to the presence or absence of the bit and its time length, and the digitized data recorded on the disk 140 is read out from this. be.

By the way, in the program area (radius 25 to 58 [vmn]) of the upper A4 disk 140, there is a plurality of audio data (hereinafter described as songs), as well as data indicating each song number (TNO) and data in the same song. data indicating each divided area (hereinafter referred to as index data), data indicating the elapsed time from the start to the end of each song (hereinafter referred to as relative address), and data indicating each divided area (hereinafter referred to as index data).
Address data such as data indicating continuous elapsed time (hereinafter referred to as absolute address) from the start of the performance of the music piece to the end of the performance of the last music piece is recorded. That is, the RF signal includes audio data and address data, and in this case, both data are transmitted in parallel.
).

Also, the lead-in area (radius 2) of the disc 140 is
3 to 25 [Battle]), there is data (table) showing the songs a (TNO) of multiple songs that have been completely recorded in the program area, their respective relative addresses, and their absolute addresses at the start point (beginning) of their performance. of contents (TOC data) is recorded.

Here, in the above-mentioned DAD M production device j+41, the pickup 142 is normally located at the inner circumferential portion of the disc 40, more specifically, at a portion corresponding to the playback start position of the lead-in area of the disc 140. There is. Further, the DAD playback device detects that the disk 140 is loaded in the disk loading section 111, that the ice loading section 111 is closed, and that the front 11] power (PO
According to the three conditions that the WIThR) key 113 is operated, the disc motor 14 is rotated and the contents of the lead-in area are automatically transferred to the big AR f142.
The data is read in and stored in a lead-in data memory to be described later, and the pickup 142 is controlled to be placed in a standby state with the pickup 142 positioned one color at a portion corresponding to the playback start position 1\i' in the program area of the disk 140. If, for example, the PLAY key 1 is operated in this standby state, the contents of the program area will be read out.

Here, the R F output from the pickup 142 is
(The signal is supplied to the focus control circuit 144, the tracking control circuit 145, and the gross circuit 146. Of these, the focus control circuit 144 generates a focus error signal from the RF multiplied signal and sends it to the big By giving feedback to Jin,
In order to accurately focus the light beam on the surface of the disk 140, a so-called focus servo is performed by controlling the converging lens in the pickup 142 in the direction of the surface of the disk 140. Further, the tracking control circuit 145 also controls the tracking error 1 from the RF (G).
Generate No. 21. This tracking error 1. A)
, the spot of the light beam on the surface of the L1 disk 40 deviates from the center of the track toward the inner and outer peripheries of the disk 40, which distorts the negative electrode 1 and positive electrode levels, and determines the magnitude of the deviation. In (i), the absolute value level changes by 1.1 degrees, and becomes 0 level when the spot is located at the center of the track. Then,
The tracking control circuit 145 feeds the tracking error No. 41 to the big up node 42 via a switch circuit 147 and an adder circuit 148, which will be described later.
By checking the disk 140,
7) The converging lens in the big-up lens 42 is controlled in the radial direction of the disk 1400 so that the spot of the L beam is accurately located at the center of the track, and a so-called tracking sensor is used. It is intended to provide

In addition, the tracking error (t4 + "ri,i, sat HI2
After passing through the switch circuit 47, the feed motor control circuit 1
49 and a switching circuit 150 to be described later, the pick-up 142 is supplied to the pickup 142 and the disc 14 as the raw operation progresses.
0 from the inner circumference to the outer circumference.

Further, the process circuit 146 has an upper NtiRF (
After time axis conversion, error correction, etc. are performed on No. iI, the TOC data is stored in the aforementioned lead-in data memory 15) if it is the content of the RF multiplied signal lead-in area.

In addition, if the content is in the RF multiplied signal GLODARAM area, the audio data and address data are separated, the audio data is output to the DA conversion circuit 152, and the address data is output to the current address memory node 53. do. The upper 61 audio data is converted back to the original analog data by the DA conversion circuit 152, and is used to drive, for example, a speaker (not shown) through the output terminal 154. Further, the address data is sequentially stored in the current address memory 53.

Here, a case will be described in which a search function for selecting a desired song from among a plurality of songs recorded on the disc 140 is performed. That is, 155 in FIG. 2 is a key gate part,
These correspond to the keys JJ5 to 134 in FIG.

Each of the keys 115 to 1 of this key gate section 155
34 according to a predetermined procedure, it is possible to set the song number (TNO) of the song to be selected and the relative address within that song. For example, song number "5"
If you want to select the beginning of the song, you only need to set the song number to ``5.'' If you want to select a song whose total playing time is longer than 3 minutes, set the song number to ``5'' and set the relative address of that song to ``3.''
You can set it as "minute".

Then, the song number and relative address set in the Φ-board section 155 as described above are stored in the target address memory register 156 as 1 and 15. This target address memory register 156 outputs the song number to the previous I:1: lead inputter memory 15 and outputs the relative address to one input terminal of the adder circuit 157. Then, first, the absolute address 'f:H' of the beginning of the song corresponding to the song number outputted from the lead-in data memory tsrtj,I-like address memory register 166 is read out, and the address is stored in the adder η circuit 157. Output to the other input terminal.

At this time, if a relative address is not set in the target address memory register 156, the adder circuit 15
Since one input terminal of 7 is "0", the absolute address output from the lead-in data memory 151 is added to "0", and as a result, the output terminal of the adder circuit 157 receives the lead-in data. The absolute address output from the memory 151 is output as is, and this is the pickup 142.
This is the absolute address of the destination position to which the target position should be moved. Further, when a relative address is set in the destination address memory register 156, the absolute address output from the relative address read-in data memory 15 is added in the addition circuit 152, and The output is the absolute address of the target position where the big controller 76142 is to be fZ ili++.

On the other hand, the current address memory j 5 ,? Kit:
, since the address data of the current document is stored, the absolute address is read out from the address gutter and the calculation circuit 1 reads the absolute address from the address gutter.
58. Also, the absolute address t output from the addition circuit 157 is the second position! '! tS′?
: Supplied to circuit 59. The first and second position calculation circuits 1514. Based on the absolute address, which is temporal information, the radius (distance information) of the disk 740 corresponding to the absolute address is calculated. 1/11 is an absolute address and is the 10th part 1
How many [■] +t(> A$
Whether it becomes j- is what is given. That is, the first position Ff1g? .

The output of circuit 1B11 is the current (5
The second digit 1r (the output of the 4 arithmetic circuit 159 is the radius data of the target position at which the pickup 0142 should be moved).

And the total of the first and second digits above is 14! F circuit 15B,
Each radius data output from 159 is reduced)91 circuit 1
At 60, the force is reduced from one side to the other side, and the absolute value of the difference component is output. Therefore, the output of the subtraction circuit 160 is
This is distance pica data indicating the distance between the current position 16 of the picker 76142 and the target position 1 loaf. The distance data output from this subtraction circuit 160 is
The data is set as initial data in the counter 161, and is also supplied to a kick noise generation circuit 162, which will be described later.

Further, the current address memory 153 and the applying circuit 15
Each absolute address output from 7 is supplied to a subtraction circuit 163 and a pattern-number construction circuit 164, which will be described later. The subtraction circuit 163 subtracts one of the input absolute addresses from the other and outputs the difference component, that is, the time difference component between the current position of the pickup 142 and the target position Jfj to the numerical comparator 165. and,
The threshold value controller 165 converts the time difference component outputted from the reduction↓-circuit 163 into a reference value (this reference value is related to the number of kick pulses that can be generated by the kick pulse generation circuit 162). ). here,"
When the time difference component is larger than the reference value, that is, when the distance utl# between the current position and the target position of the pickup 142 is long, the second output terminal O1 is・Irepel (hereinafter referred to as H level)
When the time difference component is smaller than the reference number I1, that is, when the distance between the current position and the destination position of the big array 7'' 142 is short, the second output terminal 02 is set to H level.

Then, the subtraction circuit 163 determines whether the subtraction result is positive or negative (this indicates whether the target position 16'' is on the outer circumference side or the inner circumference side of the disk 140 with respect to the current position of the pickup 142. A polarity signal is supplied to a level shaping circuit 166 and a polarity inverting circuit 167 in accordance with the output signal (corresponding to 1).

Here, the key is played by the first hand section 155.
(TNO) and relative address etc. are set! When the last operation corresponding to the search function of the key date unit 155 is completed, this DAD (reproduction device city) starts the search operation. is turned on.One end of this search switch 168 is connected to a direct current (DC) 41 with the polarity shown.
: is grounded via a source 169, and the other end is connected to a set input terminal S of a set/reset flip-flop circuit (hereinafter referred to as an S-RFF circuit) 1700. Therefore, when the upper search switch 168 is turned on, the S -
Since the set input terminal S of the RFF circuit 170 becomes H level, its output terminal Q is set to H level.

And now, Big Alazino 42's current position +41't'
In contrast, it is assumed that the target position is on the outer peripheral side of the disk 140, and that the distance between the current position 11'N and the target position is sufficient. Then, the first output of the numerical comparator 165? :WO1 is at H level and S-
Since the output yMi Q of the RFF circuit 170 is also at H level, both outputs A! The output terminal of the AND circuit 17 to which 01 +Q is connected to the input terminal becomes H level. The output of this AND circuit NOR 1 is supplied to one input terminal of another AND circuit NOR 2. The output end of the monostable multipipe l/-tor 173 is connected to the other input end of the AND circuit NOR 2. Here, the monostable multivibrator 173 outputs No. 4.4 of private II level, and the 5M1lJ 'tA-, +il'>J
When a flow signal (described later) is generated from the counter 16, this flow signal is used as a trigger to output a signal at a low level (hereinafter referred to as L level) for a predetermined period of time.

Therefore, the output terminal of the AND circuit 172 is connected to the level L (this causes the front rudder switching circuit).
is switched to supply the In other words, this switching circuit 15θ is AND times h! ii 7 y,? The IgJ is changed to supply the output of the level shaping circuit h'6166 whose output terminal is at H level to the pickup and feed motor 14.7, and when the output terminal of the AND circuit 172 is at L level, the output of the feed motor control circuit h'6166 is The output can be switched to supply the output to the pickup feed motor 143. Therefore, in normal playback conditions, the search switch 16
8 is in the off state, the output terminal Q of the 5-RFP' signal 170 is at L level, and therefore the AND circuit 1
Outputs of 71 and 172) are both at L level,
The pickup feed motor 143 is connected to the feed motor control circuit 1.
It is controlled by the output from 49, and stable reproduction is performed.

Here, in the search operation as described above, since the output terminal of the AND circuit 172 is at H level, it is controlled by the output of the pickup feed motor) 43d level shaping circuit 166.

The level shaping circuit 166 generates all jljg motion signals having a constant level of positive polarity +4 or negative polarity based on the polarity signal output from the subtraction circuit 163. Then, because the objective I'I device is on the outer circumferential side of the disk 140 with respect to the current 61 of the pickup 142, the subtraction circuit Noro 3 subtracts /J'? The result is positive. Therefore, the reduction initial circuit 163 outputs a polarity signal corresponding to the mounting result "stop", and thereby the level N so (form rotation h'+516t; outputs a drive signal of positive polarity level to the pickup feed motor 143). Hey, pickup 14
2 is shifted by 71i% toward the outer circumference of the disk 40. If the subtraction result of the subtraction circuit 163 is still a square, the subtraction η1 circuit 163 outputs a polarity signal corresponding to the “negative” result, and thereby the level shaping circuit 16
When the drive signal 6 outputs a drive signal of negative polarity level, the pickup 142 is moved toward the inner circumference of the disk 140.

On the other hand, when the search switch 168 is turned on, 5-RFF
When the output terminal Q of the circuit 7717 becomes H level, the output of the monostable multi-ibrator 173);1. Since it is at H level, the output terminal of the AND circuit 174 whose both output terminals are connected to the input terminal becomes tri:II level. Then, the previous switch IO port '9j 147 is controlled to be in the OFF state. That is, this switch circuit 1
47 is controlled so that when the output terminal of the AND1 river path 174 is at J (level), it is in the off state and when it is at the L level, it is in the on state. Therefore, in the normal h raw state, the search switch 168 is in the off state. Since it is in the off state, the output terminal of the AND circuit 174 is at L level, so the switch circuit 147 is in the on state, and the tracking surge by the front i tracking control side 1 circuit 145 becomes 1 [
+, and stable re-IJF is performed.

However, as described above, in the Zarch shape 9g where the pickup 142 is moved by the 1 drive signal output from the level shaping circuit 166, the switch circuit 147f
In the off state, no tracking servo is applied, and the pickup 142 can be smoothly moved without being affected by the tracking sar.

Here, when the pick gear 42 is moved toward the outer periphery of the disc 4θ as described above, the big gear 7”
How far has 142 moved from the original place 11'1' (current position iff in terms of the above d cost 1 light)? f, IJ is detected by the gigazzo position detection circuit NOA 5. This pickup position 1° to 1° detection circuit 175 is used to generate one pulse each time the pickup 142 moves in the radial direction of the disk 140 and crosses each track, as will be described in detail later. detection(
It outputs the M number.

For this reason, the moving hand calculation counter (number) starts from the previously set initial data and sequentially counts in the reverse direction the device detection (M number) consisting of the pickup position detection circuit 175. , the movement amount calculation counter 16) generates the previous H1i flow number 1) when the count result becomes all rOJ, and outputs it to the monostable multi-gulator 173. In this case, the output terminal of the monostable multivibrator NOR 3 becomes L level, and thereby the output terminals of AND circuits 172 and 174 both become L level. Therefore, the switching circuit 150 described in O11 is switched to supply the output of the feed motor control circuit 149 to the pickup feed motor 143, the movement of the pickup 142 in the outer circumferential direction of the push disk 140 is stopped, and the switch circuit 147 is turned on and a tracking sensor is applied. Then, the disc 140 is played back at the position where the picker f142 stops.

Here, the position 14 at which the upper ML pickup 142 stops is approximately the same as the target position described above. That is, the initial data set in the shift counter 16 is distance data indicating the distance between the current position of the pickup 142 before the target position and the target position, as described above. On the other hand, the device detection signal tt1 constituted by the pickup position detection circuit 125 is 1 pulse generated every time the pickup 142 crosses one track on the disk 140, and the track pitch is as described above. Since it is 1.6 (:z*m), in short, it indicates the position where the pickup 142 has moved from its current position + int.For this reason,
1) Using the initial data set in counter 16 as the starting point, count the signals of the detection signal 1?j in the reverse direction sequentially, and the count result becomes all 0. , without recovering from defeat, Big Up No. 42
This is because it is certain that the distance i11 has moved between the current position 1j and the destination position 1N.

Therefore, theoretically, the position where t, 1 and big ara f142 stop coincides with the destination position IN, but in reality, due to eccentricity of the disk 140, variations in track pitch, etc. Approximately equivalent devices are also used.

As mentioned above, the pickup 142 is
The disc 140 is played back at the position where it was stopped. At this time, the RF number output from the pickup 142 is again separated by the processing circuit 146 into Oy#io data and address data, and the address data is stored in the current address memory 153. Then, the absolute address of the new address data stored in the current address memory 53 and the previous address 81: adder circuit 1.
The absolute address of the destination 1t output from 57 is the first
and the second position converting circuits 1511 and 159, respectively, and are subtracted by the subtraction circuit 160, and this new distance data is set as initial data in the movement amount calculation counter 16). Here, the previous H self-tanya 5.1 multivibrator 1
73VJ... is set to hold the L level for a sufficient period of time to perform playback at the position where the pickup 142 is stopped and to store the address data in the current address memory 75.9. Then, when the output end of the monostable multi-gulator 173 is returned to level 11 again, the Zurg operation as described above is started again.

・When the movement of Big Anono 42 is stopped again in such a second Chi 1 + 1 mountain production, Pickup 142 is in the first position of that stop, IF, and ILR live! Each piece is made one by one, and the above-mentioned search operation is repeated.

Here, the repetition number of such search operation is J1.
The current position (7) absolute address of the pickup node 42 output from the current address memory 153 and the addition circuit 157
The absolute address of the 14th position 1′ outputted from the 14th position 1′ becomes extremely equal, and the time difference component outputted from the reduction j′1 circuit 16.9 becomes the reference number n〆(
It will be stopped when it becomes smaller than . In other words, ``1
When the time difference component output from the reduction yr circuit 163 becomes smaller than the reference value, the numerical value comparator No. 5
The first output terminal 01 is set to L level, and the second output terminal 02 is set to H level. Then, and times F1 ~ 171.17
Since the output terminals of 2 are both at L level, the switching circuit 150
Is the output of the feed motor control circuit 1.11 circuit 149 the pickup feed motor J 4 ? This is because it is switched so that it is supplied to

“It’s a size,” - written! ? li-,! When the time difference component output from the l-road groove 3 becomes smaller than the reference value of the numerical compiler 165, on the disk 140, the current position t6゛ of the pickup 142 and the target position 1rt of the pickup 142 are expressed.
This is when the difference is less than a few [μm] in terms of the number of tracks and the distance of several tracks.

Then, when the second output terminal 02 of the numerical converter/mother generator 165 is brought to the H level, the 5-RF'F circuit 1
Since the output terminal Q of 70 is also at II level, both output terminals Ox
, Q are connected to the input terminals of the AND circuit 176, and the output terminal thereof becomes I (level).

Here, when the second output terminal 02 of the numerical controller or controller 165 is set to 1 (level), the movement of the pickup 142 is stopped during the aforementioned search operation and the address data at that position is Since this is the time of reading, the output terminal of the monostable multivibrator 173 is set to L level.Therefore, when the output terminal of this monostable multivibrator 173 is returned to II level,
This output terminal and the output terminal of the AND circuit 177, which is connected to the input terminal of the AND circuit 76, are set to level 2). For this reason, the kick noise and rush generation circuit 162 is increased by "+" (!+Q).

This kick pulse generation circuit 162θ1, the details of which will be described later, outputs a so-called kick pulse to accurately move the pickup 0142 by several tracks, and it uses the distance data output from the verse reduction circuit 160. Based on the distance data (several tracks), a kick pulse is generated to move the pickup 42 by a distance corresponding to the distance data (several tracks). Then, the positive polarity and negative polarity of the kick pulse are determined by a polarity inverting circuit 167 based on the polarity signal output from the subtracting circuit 163, and the kick pulse is supplied to the adder circuit 148. At this time, the 5-R
Since the output terminal Q of the FP circuit 170 and the output terminal of the monostable multivibrator 173 are both at 1 level, the output terminal of the AND circuit 174 is set to H level, and the switch circuit 1
Unless 47 is in the off state, the tracking servo is not applied.

The kick pulse is then supplied to the pick-up feed motor 143 via the feed motor control circuit 49 and the switching circuit 150 after passing through the addition circuit 148.

At this time, Big Ag j42rJ: Moved by several tracks.
1111 and reaches the previous 1111 destination 1d. Note that when the upper kick pulse 812 is of positive polarity or negative polarity, the pickup 142 is activated by the disk 14.
0 by several tracks in the outer and inner circumferential directions. When the pick-up node 42 reaches the target position and that position is reproduced, the absolute addresses output from the current address memory node 53 and the adder circuit 157 become completely equal. Therefore, the i9 turn coincidence detection circuit 164 detects that the direct delivery pair address has completely reached 11tt, and outputs an H level signal to the reset terminal R of the 5-RFP circuit 170.

Then, the 5-RFF circuit 170d is reset and its output terminal Q is inverted to L level, and the entire search operation is completed here. Then, 5-RFF circuit Noah 0
As the output terminal Q of the switch becomes L level, the output of the AND circuit 174 also becomes the El level, and the switch IL! l
Since the It' self 147 is turned on and a tracking search is performed, the selected target position 1 can also be stably reproduced.

Next, the pickup position 1ti': detection times M 175
The details will be explained below. In other words, this pickup position 1r side output circuit 175 receives the track 1. This uses the King error signal. 9. As shown in Figure 3,
The input terminal 178 to which the above-mentioned toking L Rai^ is supplied is the () level controller 9 regulator 179 and the output y
It is connected to the moving mouse calculation counter 161 through the M child j g o @.

In other words, the tracking error signal t falls on the surface of the disk 140 as described above) Y; the beam spot is shifted from the center of the track toward the inner and outer circumferences of the disk 140. , has polarity and positive polarity, and the absolute value level changes depending on the size of the deviation. When the spot is at the center of the track, the O level is reached. Therefore, the soil + iL spot is moved in the radial direction of the disk 140, and the number of tracks is
1 go, -to's tracking error, -i month's earthquake t
'', 4th 1(n) ノJ('su-9 ni Unaru. 4th
In 1gl (a), the period during which the tracking error information rises in the figure is tracking third day iiJ.
The period in which tracking is impossible (iH area) is indicated, and the period in which it is on the left in I':':1 indicates the area in which tracking is impossible. The () level cross point in the period indicated by , indicates that the spot is located at the center of the track, and the 0 level cross point in the period indicated in the upper left corner of the figure indicates that the spot is located at the track and adjacent to the track. This indicates that the spot is located in the center of the other tracks.Therefore, this tracking error 1. In one monthly cycle, the spot is 1)
truck k.

4 Yellow

For this reason, ``2^self-tracking coniler (,:4 M
k f Rubercon/4' rater 17'9''' Corehe) L = , l!: Jt comparison 1., a When the level of the fire tracking en-yi is greater and less than the 0 level, the Ii level and L level When a signal of f is generated, f
't\4 A 2 pulse waveform as shown in Figure (b) is generated. Therefore, since one cycle of this flat pulse waveform corresponds to the spot crossing one track,
A J zf pulse is generated in a book whose spot crosses one track on the disk 140, and the pre-coordination ji
(14.+) This is the output signal.

next,! ? About Kick Kitskus.

That is, as shown in FIG. 5, when the kick pulse starts to generate at time TI, a signal with a constant level of positive polarity is output, and this becomes negative (constant level of positive polarity) at time T2. The level of
It's about getting back to the level.

Then, at time Tl, the pickup 142 is on disk 1.
40, and its movement speed reaches time T.
It reaches the maximum at 2, and after that, it is sequentially reduced by r11 by the negative polarity level 4M ”:), and pick-up 1 is reached at 11S time T3.
42 is stopped. Therefore, the kick pulse generation circuit 162 moves the pickup 142 by a predetermined number of tracks by appropriately setting the width from time T1 to T3 based on the 1 city 1ii11 data output from the front 112 reduction initial circuit 160. It is something that can be done.

Here, the negative polarity level bucket → 3", Ribic Ano 1
As a result, the pickup 42 may overrun the target position due to its fault, or it may be difficult to stop at the target position due to damped vibrations before and after the target position. Therefore, the pickup 142 can be quickly moved to the target position and can be completely stopped on the track at the target position.

When the pickup 142 is moved to the inner circumferential direction of the block 140, the period from T1 to T2 is set to the negative L level (+j, and the period from T2 to T3 is set to J[polarity level The number J+ is good.Then, it is determined by the reduction circuit 16 whether to output a kick pulse that moves the pickup 142 toward the outer periphery of the push disk 140 or to output a kick pulse that moves the pickup 142 toward the inner periphery.
,? The polarity outputted from the Fj signal (the polarity inversion circuit based on the Fj number) is set by the polarity inversion circuit 62.

Note that the time T2 at which the positive polarity level is reversed from the negative polarity level and from the negative 4 @ residence level to the positive polarity level does not necessarily have to be at the center of the times TI and T3, but may be set at the pick-up 142 depending on the comfort. Depending on the number of tracks to be moved, etc., the kick pulse generation times l1ll'1162
So 1iijl ii! It can be made to do so.

Therefore, according to the search means shown in FIG. 2, first, the radius of the disk 140 is calculated from the absolute address of the current position of the pickup 142, and
From the absolute address of the target position to the disk 140 at that position
Determine the radius of (1) and determine the distance to which the pickup 42 should be moved by finding the difference between the two tongues (distance data).

Then, each time the spot crosses one track by moving the big ara f142, the number of pulses of the position detection signal that is generated is counted 2, and the number of pulses is increased 14.
The moving distance of 2 is 11'1jIl! Since the movement of the pickup 142 is stopped when the f data and appetizers are reached, the pickup 1 can be moved quickly and fairly accurately.
42 can be moved to the target location using a jd machine, and the performance of the search function can be improved.

Regarding this point, conventional search means-1 is performed as follows. First, the track number (TNO) of the target position 1 and the relative address within that song are specified, and it is determined whether the target position 11 is on the inner or outer side of the disc with respect to the current position of the pickup, and then the pickup move in the determined direction. At this time, focus servo and tracking serve are applied, and while pickup 0 is moving, 7
;The address data is read out at t.

Then, using this advantage, move the pickup until the address y'-evening song 11i is distorted to the target position 11 and -4.(r).Next, move the pickup The speed is slowed down and the pickup is moved so that the width of 1 minute of the relative address in the read address data matches the width of 1 minute of the relative address at target position 16. 4j11 Slow down the speed of the pickup until the digit of ``1 second'' of the relative address in the address data extracted to t''1 matches the digit of ``second'' of the relative address at the target position. The pickup is made to pile up S;, and the pickup is moved to destination 16.

For this reason, even when the pickup is moving at its fastest speed, it must be fast enough to stop the address data from being read, which poses the problem of not being able to perform a quick search operation.

However, by the search means shown in FIG. 2, r, r,
Based on the distance y゛-Y between the radius of the current location and the radius of the destination position of Getsuquanono 42-C1 the distance Yl(
Since it is a sea urchin, there is no need to read the address data while moving, and the movement and use of the pickup 142 can be done quickly. 12.

Unfortunately, 4.1 ~ is also easy [ii'i, especially if you use a microconverter, most circuits can perform their functions through program processing.
1. It's a no-brainer.

Furthermore, during the search operation, the drive signal and kick pulse output from the level shaping circuit 166 and the kick pulse-generating circuit 162 are
When the kick pulse 11ri:, J: is being moved, the switch circuit 147 is turned off so that the tracking sensor d- is not applied. Is it Tracker Zu? Since the disk 1400 is moved in the radial direction without being affected by any interference, the disk 1400 can be moved smoothly, and it can be smoothly moved to the L1 position.

In addition, the position detection signal of the pickup 0142 is generated using the change in tracking error that occurs when the spot actually crosses one track.
When ir is layered with exactly one eRus,
Secure! It is the one who does the work and works. Furthermore, 1st place! Detection (described in 8-1') by converting the dragging error signal into a 0-level converter /#t, /!'179) into a 4-pulse waveform. (- is something that can be done.

Then, the search operation performed by the above h1 is the search operation of the dosugetsukup'142, and the :l' between the current position and the target position 111'.
If lj separation is long, level shaping 1i-i1tl! 1
5 Pickup 1 with the drive signal output from t66
42, and when the distance between the current position and the target position of the pickup 142 becomes 171) pronation of yyr'J￥:, move the big a-no-no 42 to the target position 11't with a kick pulse! 11b, it is possible to perform a quick and accurate search operation.

Basic cases like I-hi and Nasano 1. Regarding I) AD reproducing device, the features of the present invention will be explained below. In FIG. 6, parts that are the same as those in FIG. 2 are designated by the same number -m1, and only the different 1115 minutes will be described here. That is, 8+'z 6 181 in the figure is the TOC7' output from the process circuit 146.
- This is an input terminal to which address data and address data are supplied.

Of these, TOC data is the lead-in data as mentioned above.
' - is stored in the data memory 15. Further, the address data is separated into absolute addresses and relative addresses, and sequentially stored in the absolute address memory 182 and the relative address memory 183, respectively. Then, the output of the absolute address memory 182 is supplied to one input terminal of the cutoff circuit 184, and the output of the relative address memory 183 is
Output of the lead-in data memory 15) and addition circuit 1
85, the other hand power ψ1 of the soil 1 switching circuit 184
Mi) is supplied to Also, "2ft1-: j, J
J41. Q times h! ? 'r 1/? The output end of 4 is
Previous i71 Shimei λ1 position instrumentation 1ijllllA 7
s s, decrease ↑-: connected to the circuit 163 and the pattern matching circuit 164 not shown in FIG.

Here, the switching circuit 7114 i, ll, the above equation 11
The switching is controlled by the output of the 1'7 comparator 65. That is, this numerical comparator 165 outputs the first and second outputs 1
It has a third output Xj OB outside of 02. This numerical value converter 165 is connected to the subtraction circuit 16.
The time difference component output from 3 is compared with a predetermined judgment value larger than the reference value mentioned above, and when the time difference component is larger than the judgment number (1^), the third output terminal 03 is set to II level, and the time difference component is set to II level. When the value is smaller than the determination value, the third output terminal 03 is set to L level.

That is, when the distance between the current position ij7 of the pickup 142 and the target position is long, the numerical comparator Noro 5 outputs the output terminals 0! Let 03 to 03 be Fl, L, and H levels, respectively, and the current (r'I,
l/i li between i blue and the target position h/r, the IC becomes shorter" 2nd edition') r! , becomes shorter than the distance P11 corresponding to the numerical value, the 'Jth to third output terminals are set to H, respectively.

L, L level, 11 (I and purpose)
If (F is even shorter, then the above reference number (ij
When the level becomes more smoky than the level 1' corresponding to i, the first to third output terminals are set to L level, 11 level, and L level, respectively.

1.1: The switching circuit 184 is a numerical comparator L/
- When the third output H'44i 03 of the evening 165 is at II level, the absolute add output memo sono 820 output is set to the first digit b'
+: rit 4? , written in circuit 158, the value -t
When the third output terminal 03 of the regulator 165 is at L level, the output of the adder 22 circuit 185 is sent to the first stationary arithmetic circuit 15.
It can be switched to 8 as desired.

Therefore, the third output terminal Os of the numerical comparator 165 is at H level (current position 16 of the big I-off 0-42).
．． The distance between the target position and the previous He judgment 1 (f11'l
), the current position [1] of the pickup 142 output from the absolute address memory 182 and the M.
1] output from 7 (the absolute address of Y'r111 is the 1st and iij, 2's digits, 'nl center',
11; Reduced li1 circuit via 1 path 15B, 159) 6
θ is reduced by 17, resulting in 9 distance data for the previous h1'.

Then, this distance 1111 data is sent to the previous II self-movement counter 161 via the output terminal 186; F, IJ
It is set as jυJ data, and the first work of Yoyo Nachi II No. 1 mentioned in Mfl is performed.

Then, the search 1ijl+ is performed in this way, and the pickup 142 is set to [1 4j7' fL+ by 9, and the number ii4: I t+ L/- evening 165 a'3's output 1^HO, is L level (pickup 142
Seal 1. It is assumed that the distance between the position 1 and 4 and the target position has reached the above-mentioned determination number (i1'j is greater than i1'j). At this time, the pickup 142 can be considered to be located within the playing time of the song corresponding to the song number (TNO) set by the keyboard section 155 (the target position is within this time). . -, then this J- is 1, relative address memory 78. ,? iJ4,” 2HL
: Set 111? The relative address (+71iij) of the pickup 142 in the song corresponding to ii is output.

′! l:/ko, previous 1; own lead-in data memory 15)
As mentioned earlier, the key d? - r to the code section 155.
+ii: 'jl', based on the song t (♀ (TNO), σ), the absolute address of the 1147th point (1 night) at which the performance of the song starts is output. In this case d), the output of the adder circuit 185 which adds the output of the manual relative address memory 183 and the output of the lead-in data memory 15 is the absolute address of the current position 16 of the pickup 142. It becomes. Then, the absolute address of the current position ji'4 of the pickup 142 generated in this way,
The absolute address of the target position output from the adder circuit 157 is 11"+1 and the second position calculation circuit 758.J.
59 and is subtracted by a subtraction circuit 160, new distance data 75 (η) is output, and a search operation is performed based on this distance data.

Therefore, first, look into the pickup 142.

The distance between the current position phi and the target position 1u is r
4, when ('1, ↓ of the pickup 142 output from the absolute address memory node 82, [l position Il'+I'
and the absolute address of the target position I11' output from the addition circuit 157, the previous jt1. :
lton f'f14: f''-Yuubatsu generation, pickup 1
When the distance between the current position of 42 and the destination position 11 is within the predetermined distance, the output of the lead-in data memory 15] and the A1]me address output from the relative address memory 183 are The absolute address of the current position 1a of the pick-up node 42 obtained by adding and the destination position 1
Since the distance data is generated using the absolute address of , the search operation can be performed quickly and accurately.

In other words, the absolute address at the beginning of the performance of each side in the TOC data recorded in the lead-in area of the disc 40 is the actual address of each side obtained by playing back the address data recorded in the program area. In practice, there are many cases where the absolute address at the start point (beginning) of a performance is not accurately indicated. Therefore, as shown in FIG. 2, the distance data is generated from the absolute address of the current position of the pickup 142 output from the current address memory 153 and the absolute address of the target position output from the adder circuit 57. It is not possible to select the beginning of the set song simply by moving the pickup number 42 based on this.

However, as shown in the PI3 diagram, first the absolute address of the current position -° of the pickup 142 and the target position ll-1 are
The pickup 142 is moved to the vicinity of the destination 11' based on the distance data generated from the absolute address and the absolute address of the pickup 142, which is generated using the relative address. By moving the pickup 142 based on the distance data calculated from the absolute address of the position, a quick and accurate search operation can be performed.

FIG. 71 shows a modification of FIG. 6.

That is, the absolute address of the current position j:B of the pickup 142 output from the absolute address memory IFJ2,
The absolute address of the target position output from the adder circuit 157 is 1.11;
11. Ii'1) is done. The ROMs 187 and 788 each contain six conversion tables that convert absolute addresses (temporal information) into radius data (distance information) of the disk 140 at a predetermined unit time frJ. 1 is considered.

In other words, the ROMs 787 and 188 have the same functionality as the previous Nl'J first and second position calculation circuits 158 and 159. And these ROM117゜1
Each radius data output from 88 is reduced by j#-circuit 16
The data is subtracted by 0 and supplied to one input terminal of the switching circuit 189 as the distance data.

Further, the relative address output from the relative address memory 183 is stored in the target address memory register 156.
The time difference y'-ta is subtracted by the subtraction circuit 190 from the A address set in , and the time difference y'-ta is sent to the other input via ROM No. 9. At the end (II; x1+ is applied. This Tl0M J
A negative table 91 is stored in which the time difference data is converted into the radial distance r of the disk 40 for each predetermined unit time.

Further, the output end of the 1θ converter circuit 189 is connected to the front 11 and 186. Then, this I;IJ l(A circuit 71j 91rJ, the third output ψ;74 o 3 of the numerical converter 165
At the level, the distance jilt 7'-y output from the subtraction circuit hlt'r J 6θ is output)) 1° 14 output terminal 186, and the output terminal 03 of 133 of the numerical converter 9-lator 165
When the output terminal 186 is at the L level, the distance data output from the ROM 9) is switched to the output terminal 186).

For this reason, the current location and purpose of Big Up No. 42 (＼'
/l i+′i, if the distance between
The third output terminal 03 of the router 165 (H rail) stores the absolute address of the current (1, 'Ii#) and the absolute address of the destination position of the big array f142 in the ROM 787゜18.
Distance i obtained by subtracting 1f4shi from the radius data in 9
Big 17"z42 is moved based on the ff data.

On the other hand, the number (1+i
When the third output terminal 03 of the J comparator Nolo 5 goes to L level, the pickup °142 reaches the performance time of the song corresponding to the set song number (TNO) first, just like the J bed. Therefore, the phase (address) output from the relative address memory 183 and the target address set in the memory recorder 156 (11), the phase I address, indicate the time within the same song. Therefore, the time difference data between both phases and 1 address is stored in ROM 1.
91 to 1 distance data, and the pickup 42 is moved based on this distance data, it is possible to obtain the same effect as shown in Fig. 6. It is something.

Discarded temporal information in ROM 1/! 7, 188
.

Since the conversion table stored in 191 is used to convert to distance information, the speed of search Sb creation is reduced to 1.
In addition, it is not necessary to perform calculations to convert the absolute address into radius data and central data each time an absolute address is used, which is especially suitable when using a microconverter as described above. It is something that becomes.

It should be noted that the present invention is not limited to the above-mentioned embodiment, but can be implemented in various modifications without departing from the spirit thereof.

〔Effect of the invention〕

Therefore, as described in detail above, according to the present invention, it is possible to perform a quick and accurate search function with simple configuration, especially in a disc record playback device that plays back a disc on which r-notalized data is recorded. Therefore, it is possible to provide an extremely good disc record playback device.

[Brief explanation of drawings]

FIG. 1 is a front external view showing an outline of a CD-type DAD playback device i5' to which the present invention is applied, and FIG.
Figure 3 is a block diagram showing the basic structure of the electric circuit system of the reproducing device; a)
, (b) are the same big up 0th place + 1”i, respectively,
4/12 Waveform N, 51st to explain the operation of the output circuit
・0 is a waveform diagram of /ζ to explain the kick and pulse of the same electric circuit system, FIG. 6 is a block f14 diagram showing an embodiment of the disc record playback device 1 according to the present invention,
The figure is a real hf! FIG. 7 is a block configuration diagram showing a modification of example i. 110...cabinet, 11...disc side part, 112...eject key, 113...work key, 114...display section, 115...rick-
Skiing, 1 noro...first forward key, 11
'7... Gray key, 118... Next gray key, 119... Repeat key, No. 20... Pause key, No. 12... Stock key 1122 to 131.
・・Number □ character key, J32 ・・Memory read key, 1
33...Memory key, 134...Clear key, 14
0... Disc, 14 No... Disc motor, 14
2...Pickup, 143...Big Ano Okuri Tanabata, 144...Focus Kei Kamizuki 1111.14
5...Tiger. King 1lill fi! '11th time・'6.146・
...Pronas circuit, 147-...Switch circuit, 148
...Kanume +, ill road, 149... evil motor''l
1i116i11 circuit, ノ 50...17 month (-1
Times l118, 151... Lead-in y'-ta memory,
152...DA converter circuit, 153...Current address memory, 154...Output terminal, 155...Key go 1 part, 156...Target address memory record source,
157... Addition 9 circuit, 158... 1st digit lid:
Ptl circuit, )59...2nd digit 1"4.' F
TI"t'1 circuit, 160...subtraction circuit, 161...
・Move DIFi port 1 counter, 162...1 tsuku・
YaRus original rebirth 111/f1163...subtraction circuit, 16
4... No-ya turn-number configuration circuit, 165... Numerical comparator, 166... Level shaping circuit 1] 16, Noro 7... Polarity and rotation 11111.168... Search switch, Noro 9. ...i! ￥ j'f, City 5 Gen, 170・
...5-RFF circuit, 171,172...AND times &
6.77.9... Monostable multivibrator, 174
...AND circuit, 175...Birakutu 2F degree lr
J detection circuit, 176.117...AND circuit, 178
...Input terminal, 179...0 Level comparator, 180...Output terminal, 18 No...Input terminal, 18
2...Absolute address memory, 183...fil 2
9 Address memory, No. 84...Switching circuit, No. 85...
・Addition circuit, 186... Output terminal, 187, 188・
...ROM, 189...switching circuit, 190...decrease 1
Circuit 17, No. 91... ROM0 tU Disabled One Agent Patent Attorney Suzue Takehiko Figure 6 Figure 7r4

Claims (1)

[Claims] Multiple digital data obtained by converting information signals into PCM,
Optical high-speed pickup from a disc recorded with an absolute address formed by adding temporal information to the plurality of digital data consecutively and a relative address formed by adding temporal information to each of the plurality of digital data. In a disc record playback device that extracts the digital data, an absolute address, and a relative address, the target position 16'' to which the pickup should be moved is determined by the absolute address and the relative address of the digital data including the absolute address. and a setting means for converting the difference component between the absolute address set by the setting means and the absolute address read from the pickup into first distance data corresponding thereto, and moving the pickup in the direction of the target position. a first converting means for generating a drive signal for moving the pickup; and a first converting means for generating a drive signal for moving the pickup, and converting the difference component between the relative address set by the setting means and the relative address read from the pickup into a corresponding second distance r-t. a second converting means that generates a drive signal for converting and moving the pickup in the direction of the target position; and when the difference in distance between the current position left of the pickup and the target position is greater than or equal to a predetermined value and less than a predetermined value, the first and a switching means for selectively guiding second distance data, and generating a movement amount detection f-ta corresponding to a distance by which the pickup is moved in the radial direction of the disk by the first and second conversion means. a movement amount detection means; and a stop means for stopping the movement of the pickup in a state in which the movement amount detection data outputted from the movement amount detection means corresponds to the first and second distance data guided by the switching means. Be sure to have it! Disc record playback device Jd that costs 1 yen.