JPS5952467A - 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 the disc on which a digital data is recorded. CONSTITUTION:The radius of a disc 140 at the present position and the objective position 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 number of pulses of the position detecting signal generating one pulse every time the pickup is shifted and a spot crosses one track is counted and when the shift distance of the pickup is equal to the said distance data, the shift of the pickup is stopped. In this case, the absolute address is converted into the radius data with a conversion table stored in an ROM. Then, the ROM is stored with the conversion table converting the absolute address into the radius data of the disc 140 at each prescribed unit time.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a disc record F+8 production device suitable for, for example, a CD (optical compact disc) type DAD (digital audio disc). This invention relates to a search system for quickly selecting (cueing) data.

[Technical background of the invention and its problems]

Recently, in the field of sound and crushing equipment, PCIν1 (pulse code modi,...
The digital N[i recording and playback system, which uses L1/-John) technology, is being fully adopted. This is called digital audio, and the audio characteristics do not depend on the characteristics of the recording medium and are much superior to the analog recording and playback system used in the United States. This is because it is established in principle.

In this case, a system that uses a disk as a 612 recording medium is called an I) At) system, and optical, electrostatic, and mechanical recording and reproducing methods have been proposed. However, no matter which method is adopted, the playback device that embodies it must be able to satisfy extremely advanced control functions and performance that are not found in those in the United States. has been done.

In other words, if we take the CD system as an example,
A transparent resin disk with a diameter of 12 (cm) and a thickness of 1.2 cm is coated with a metal thin film that forms pits (irregularities with different reflectances) corresponding to digital (PCM) data. Approximately 500 ~ by CLv (constant linear velocity) method
It is driven to rotate at a variable rotational speed of 200 (r, p, m), and reproduced in a linear tracking manner towards the inner circumference III using an optical pickup containing a semiconductor laser and a photoelectric conversion element. , the track pitch of the disc ζ1 is 1.6 [μm], and a huge amount of information that can be played in stereo for one hour even on one side is recorded in the Zorograno area (radius 25 to -48 [rnm]). This can be easily seen from the fact that their index data and the like are recorded in the lead-in area (radius 23 to 25 (m)).

However, in this type of disc record production device that has been known in the past, it is particularly important to select desired data (songs) from among a plurality of data (songs) recorded in the program area (select (start) This is considered to be a problem that needs to be solved urgently because no one has yet realized a search function that can be used accurately and quickly.

[Purpose of the invention]

This invention was made based on the above-mentioned circumstances, and is an extremely effective method that enables a quick and accurate search function with a simple configuration, especially in a disc record playback device that plays back a disc containing digitized data. The purpose is to provide and distribute good disc record playback equipment.

[Summary of the invention]

That is, the present invention provides a disc record reproducing apparatus which reads digital data and temporal information from a disc on which digital data obtained by converting an information signal into PCM together with temporal information is recorded via an optical pickup. , the big-up 1r: temporal information of the target position to be moved'? I: a setting means for setting, a conversion table for converting the temporal information recorded on the disk into radius information of the disk every predetermined unit time, and the temporal information and the temporal information set in the setting means; storage means for converting the temporal information read from the pickup into radius information of the disk; and storage means for subtracting each radius information converted by the storage to calculate the distance between the current position of the pickup and the target position. subtraction means for generating distance data and a drive signal for moving the pickup in the direction of the target position h1 forward; and movement line detection data corresponding to a distance yta by which the pickup has been moved in the radial direction of the disk by the subtraction means. and a stop means for stopping the movement of the pickup in a state where the movement detection data output from the movement detection means corresponds to the distance data calculated by the subtraction means. It is characterized by (and)
The pickup is moved quickly and accurately to the target position.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. First, a general description will be given of the CI) type t) AD reproducing device 6 to which the present invention is applied.

That is, ej < 1 Figure 1 shows a front external view, in which 111 is a kangaroo pocket-type disk drive J that is provided in the front of the key cabinet 110 so as to be openable and closable.
This is County IIi. On the left 1fl of this disc loading section 111, there are provided an eject (p,, rgcT) key 12 for opening and closing the disc loading ro 11, and a noyawar (poWFJR) key 113 for the concubine. There is.

1. On the upper right side of the disk drive 114 part 11, there are 6 inserts for the display section 114, the reverse (+TGV) key 115 for backward operation, and the reverse (+TGV) key 115 for fast forward operation. A fast forward (FF) key 116 and a play (PLAY) key 117 for !ray operation are provided.Also in the middle row are Q'1, Netast Play (NEXT P)
LAY) key 118 and Libby) (REPF, AT
') key 119 and PAUSE key 120
and a strug (5TOP) key 121. Also phantom at the bottom: o t 1 r21..., 9
numeric keys 122 to 131 and memory read (M R
An EAD ) key 132 , a MEMORY key 133 , and a CIJAR key 134 are provided.

Then, the eject ([eJE
CT) Display 114a + 5EARCJI display 114b, 1-R (ERitoR) display 11
4er repeat) (REPEAT) indicator 114d,
MANUAL display 114e, AUTO display 1141. Memory (Mp:M
O+ty) Display 114g and 8 channel memory indicator (MEMORY INDICATOR) 1
14 h and song number (MO8ICNo.) display 1141
and a time (TlMg) indicator 114j.

In addition, the gray (PLAY) key 117 and the pause (p
Also during the Ausg) key 120, each play (PL)
AY) Pause on display 114 (PAUSIi:)
A display 1141 is provided.

Here, Figure 2 shows 1) AI) of the CD system shown in Figure 1.
The basic electric circuit system of the endogenous device C' also shows four components. In other words, 140 in FIG.
At this time, the rotational force is transmitted to the disk motor 141.

′! ! Additionally, a pickup 142 is provided to face the signal recording surface of the recording disk 140. This pickup 142←11 is supported so as to be movable in the radial direction of the disk 140, and is moved by the driving force of the pickup feed motor 143. Note that the pickup 142 is actually provided on the side to which the disk motor J4J is attached (that is, the bottom 1+t++ of the disk 140 in FIG. 2);
In FIG. 2, for convenience, the disk 140 is drawn at 1111.

The pickup 142 is equipped with a laser beam part, a beam splitter, a convergent lens, a light IL conversion element, etc. (not shown), and first, the laser beam irradiated from the laser source part passes through the beam splitter. The light is converged by a converging lens and focused (spot) on the surface of the disk 140. Then, the laser beam changes depending on the presence or absence of pits on the disk 140 and is reflected, travels backward through the converging lens, and is applied to the photoelectric conversion element by the beam sinter.

For this reason, the photoelectric conversion element generates an electrical signal (hereinafter referred to as an RF multiplied signal) corresponding to the presence or absence of the bit and its temporal length.
'! i=output, and the digitized data recorded on the disk 140 is read here.

By the way, in the program area (radius 25 to 58 [mm]) of the disk 140, along with a plurality of audio data (hereinafter described as songs), six song numbers (
TNO), data that divides the same song into factors and indicates each divided area (hereinafter referred to as index data), data that indicates the elapsed time from the start to the end of each song (hereinafter referred to as relative address) Address data such as data indicating the elapsed time (hereinafter referred to as an absolute address) of consecutive 1's from the start of the performance of the first song to the end of the performance of the last song is recorded. That is, the RF multiplied signal V includes audio data and address data, and in this case, both data are read out in parallel.

Also, Saturday hL: In the lead-in area of the disc 140 (half 1 A, 23-25 [key]), η is the opening note (TNo) of the number of songs recorded in the program area.

Data (Table of Contents) showing the relative address of famous pieces and the absolute address at the beginning of each performance (Table of Contents)
TOC data) has been recorded 6 times.

Here, the DAD playback device 1 (7) normally positions the picker 70142 at the inner circumferential portion of the disc 140, that is, at first glance, the part corresponding to the playback start position of the lead-in area of the disc 140 [6, Further, the DAD playback device detects that the disk 140 is loaded in the disk loading section 111, that the disk loading section 11) is closed, and that the
owart) key 113 is (・), i! According to the three conditions that were created, the disk motor 141 is rotated, the pickup 142 picks up 8 elements within the lead-in area, and then the lead-in data is transferred to the lead-in data memory. I made myself 1.4, big up 142
ヲy」Isk 140's Zorograno Area Reproduction 1noi
At the beginning f) 'r, position ir, j is set to the part 6 relative to the position, and wait (it is set 11'l so that it returns to the j3Q state. Then,
For example, in this waiting state H:,'@,
) When the key 117 is operated, the contents of the program area are read out.

Here, the RF multiplied signal output from the pickup 142, focus: lil, is supplied to the l-1 circuit 144, the tracking Ib1J control circuit 145, and the process circuit 146, respectively. Of these, Phocus 1ljlJ
The i wholesale iI near 6 J 44 generates a focus error (ff1) from the RF i1 and feeds it back to the pickup 142, so that the focus of the light beam on the disk 140 surface is iE. In order to ensure accurate connection, the converging lens in the above-mentioned big-up 142 is moved in both directions of the disk 140, and a so-called focus sensor is applied. 1 ii+2 All tracking error signals are generated from the RF signal.This tracking error (i3&:t) causes the spot of the original beam on the disk 140 surface to shift from the center of the track to the disk 1
It has negative polarity and iE polarity level due to deviation in the inner and outer circumference directions of 40, and the absolute value level changes depending on the size of the deviation, and the spot is located at the center of the track. When () level is reached.

Then, the tracking system ++DI circuit 145 converts the tracking error signal into the switching circuit 14 described above.
7 and the adder circuit 148 to the pickup 142, the converging lens in the pickup 142 is placed on the disk 140 so that the spot of the light beam on the surface of the disk 140 is accurately located at the center of the track. in the radial direction! It is said that the so-called tratsuki (tratsuki)/guyase is given under the control of 1jij.

Also, "=111 tracking 1ltlf a, tracking error No. 4j output from the 111 circuit 145 &,
I, after lc via the switch circuit 147, feed motor 1li114i+l1 circuit 149 and tJI to be described later
I8 is fed to the front 1F13 pick-up feed motor 143 via the J exchange circuit 1113150, and for example, while the playback operation is progressing, the C pickup 142 is at the same position as the disk 1.
40, it is sequentially moved in one circumferential direction from the inner circumference.

Further, the process circuit 146 converts the RF multiplied signal pair 17 into the RF multiplied signal pair 17 and performs time 4ηc conversion and error correction, and then converts the RF multiplied signal lead-in area C] into the RF multiplied signal lead-in area C. The 1-node in-data memory 151 described above has 4 1. Make him a samurai. In addition, in the case of the contents of the RF multiplied signal program area, the audio data and 71. The audio data ff1l) is output to the A conversion circuit 152, and the address data is output to the current address memory 153.

Then, the above audio data is transferred to the DA conversion circuit 152.
The output terminal 154 is returned to the original analog data by
For example, it can be used to move a loudspeaker as shown in the figure. Here, 14 songs of 01 are retrieved from among the plurality of songs recorded on the disk 140. ht:i I will explain about the 1 combination of all the steps. In other words, 75 in Figure 2
5 &;l: In the keyboard section, i4'y 1 l) S1
15 to 134, respectively.

- Then, by operating each of the keys 115 to 134 of this keyboard section 155 with a predetermined hand 111ij, the song -i'; (TNO) of the song to be played continuously and - the relative address in that song It has been made possible to configure the settings. ``Image t'': the beginning of the song with song number ``5''] If you want to make the irises appear, Q, just do 'i+D,' 5Fl to song number ``5'', and do 11) 1 of song Ta j-5J. For example, the position where 3 minutes have passed since the start of the performance (assuming that the performance time of the song with song number "5" is longer than Q13 minutes), all selections, [If 7, then set to song number 1-5. At the same time, you can set the relative address of the song as "3 minutes".

Then, as shown in Me above, the song number and relative address t''1 set on the keyboard section 155 are stored in the destination address memory register 156. This destination address memory register 156 stores the track number in the lead-in data memory 15.
1 and outputs the relative address to one input terminal of the adder circuit 157. Then, first, lead-in data memory 1
5), the absolute address 'kffl of the beginning of the song corresponding to the song number outputted from the target address memory register 156 is extracted and outputted to the other input terminal of the adder circuit 157.

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 outputted from the lead-in data memory 15 is not added to "0", and as a result, the output terminal of the adder circuit 157 contains the lead-in data. The absolute address output from the memory 151 is output as is, and this is the pin.

This is the absolute address of the target position to which the quat f142 is to be moved. Further, when a relative address is set in the destination address memory register 156, this relative address and the absolute address output from the input data memory 15 are added together in an adder circuit 157.
This addition output becomes the absolute address of the target position to which the pickup 142 is to be moved.

On the other hand, since the address data of the current position of the pickup 142 is stored in the current address memory 153, the absolute address is read from the address 9 register and supplied to the first position 11 calculation circuit 158. let

Further, the absolute address output from the adder circuit 157 is supplied to a second position calculation circuit 159. This first
and 'fJ2 position calculation circuit 1587159 calculates the radius (distance information) fit on the disk 140 corresponding to the absolute address based on the absolute address which is temporal information.
It is something to calculate. For example, in the 10 minute portion of the absolute address, the distance (fin) in the radius of the disk 140 is determined by j7. That is, the output of the first digit calculation circuit 152 is the radius data of the current position of the pickup 142, and the output of the iR2 position calculation circuit 159 is the radius j'- of the target position 1ρ to which the pickup 142 should be moved. It is evening.

The first and second position calculation circuits 158.15
A subtraction circuit 160 subtracts one of the radius data from the other radius data, and outputs the absolute value of the difference component. Therefore, the output of the subtraction circuit 160 is a distance ^ indicating the distance between the current position of the pickup 142 and the target position.
1" data.Then, the distance data output from this subtraction circuit 160 is
It is set to 1 as initial data and is also supplied to a kick i9 pulse generation circuit 162, which will be described later.

Further, the current address memory 153 and the addition circuit 15
Name output from 7? The 1ft pair address is supplied to a power reduction circuit 163 and a mother turn coincidence detection circuit 164, which will be described later. The sub-timer circuit 163 calculates rMi from one of the input absolute addresses to the other, and outputs the difference component, the time difference component between the current position of the pick-up pickup 142 and the target at position, to the numerical comparator 165. Then, the numerical controller 165 compares the time difference component outputted from the subtraction circuit 163 with a reference value (this reference value is related to the width of the kick i4 pulse that can be generated by the kick pulse generation circuit 162). . Here, when the above-mentioned time difference component is larger than the reference value, the "-indication value converter 165
When the distance between the current position of 2 and the destination position is long, 24
When the output terminal 01 of the TB pickup 51 is at a high level (hereinafter referred to as In level) and the time difference component is smaller than the reference value, and when the distance between the current position and the target position of the TB pickup 42 is short, the second The output terminal O snow) is made to n level.

Then, the subtraction circuit 163e determines whether the subtraction result is positive or negative. 166 and a polarity inverting circuit 167.
supply to.

Here, the track number (TNO), relative address, etc. are set by the keyboard section 155 VL, and when the last operation corresponding to the serve function of the key date section 155 is completed, this DAD playback device starts the search operation. Start. Then, at the same time as this search operation starts, the search switch 168 is turned on. One end of this search switch 168 is grounded via a 1 current power supply 169 with the illustrated polarity, and the other end is connected to a set input terminal (81) of a set/reset flip frozzo circuit (hereinafter referred to as S-)ζFF' circuit. Therefore, when the search switch 1611 is turned on, the 5-RFF circuit 1
Since the set input terminal (S) of 70 is set to the n level, its output terminal ((2) is set to the n level.

Now, take advantage of the current position of pickup 142.”
Assume that the C target position fμ is on the outer circumferential side of the disk 140, and that the distance between the current position 11't and the target position 11'1' is sufficiently far. Then, numerical comparator 1
Output 5 of 9f+1 of 65: li01 is 1 level, and the output terminal of S-11FF' circuit 17θ (Ql is also at n level, so both output terminals Oi+Q are connected to the input terminal of the AND circuit. The output of this AND circuit 171 is supplied to one input terminal of another AND circuit 172.The output of this AND circuit 171 is supplied to one input terminal of this AND circuit 172. circuit) 7
A monostable multivibrator 173 is connected to the other input terminal of 2.
The output end of is connected. Here, the upper H11 monostable multivib L/l 173 fJ,' , °l1f
41 is normally output at H level, and when flow 4N, which will be described later, is generated from the movement counter 16, this flow signal is used as a trigger to output low pel (hereinafter n level) for a predetermined period of time. ) outputs all signals.

For this reason, the output of the AND circuit Noah 2 becomes n level, and as a result, the switching circuit 150 supplies the output of the rail 1 shaping circuit 166 to the front internal big ag transmission motors 4 and 9. In other words, in this September 1 circuit 1.50, the output end of the AND circuit 172 is 1.
When the output terminal of the AND circuit 172 is n level, the output of the level shaping circuit 166 is switched to supply the output to the pick-up feed motor 143, and when the output terminal of the AND circuit 172 is at the n level, the output of the feed motor control circuit 149 is switched to the pickup feed motor 14.
It can be switched to supply 3. Therefore, in the conventional reproduction method, the search switch 168 is in the off state 1HIJJ, and the output terminal Q of the 5-RFF circuit 170 is set to n level, so the AND circuit 17
The output terminal of 1,172 is at the n level first, and the kick-up 0 feed motor 143 and the feed 9 motor 1liil
It is controlled by the output from the IIt1 circuit 149 and performs steady reproduction.

Here, in the search operation as described above, since the output terminal of the AND circuit 172 is at the I (level), the picker f transmission motor J4.1 is controlled by the output of the level shaping circuit 166.

This level shaping circuit 166 has a constant level with positive polarity or negative polarity based on the polarity signal output from the previous i-th subtraction 1i circuit 163! It outputs ii<motion 11. In the case of jin, the target position 14 is on the outer circumferential side of the disk 140 with respect to the current position of the pickup 142, so the subtraction result of the subtraction 1' mouth 1 path 76.9 is positive ◇ Therefore, the subtraction The circuit 163 outputs all the polarity signals corresponding to the "positive" subtraction result, and thereby the level shaping circuit 1
66 outputs a drive signal of positive polarity level to the pickup multi-transmission motor 143, so that the pickup 142 drives the disk 1.
40 in the outer circumferential direction. Further, when the subtraction result of the subtraction circuit 1630 is negative, the subtraction circuit 1630
Full output of polarity No. 41 corresponding to the 3Q subtraction result "negative",
As a result, the level shaping circuit 166 outputs all the drive signals of the negative polarity level, so that the pickup 142 is moved in the direction i (d) of the disk 140.

On the other hand, the search switch 168 is turned on and the 5-RFF
When the output terminal Q of the circuit 170 becomes H level, the IP,
Since the output of the stable/multivibrator 173 is at H level, both output terminals are in contact with input 1, and the output terminal of the unified AND circuit 174 is at H level. Then, the switch circuit 147 turns ++iU g so that it is turned off.
I will be treated. That is, this switch circuit 147 is controlled so that it is in the off state when the output path 1 of the AND circuit 174 is at the H level and is in the on state when it is at the L level. Therefore, in the normal 11-state IF, Q, the search switch 168 is in the OFF state, and the output terminal of the AND circuit 174 is at the L level, so the switch circuit 147 is in the ON state +B. Tracking boo by tracking control circuit 745? is applied to ensure stable regeneration.

However, as described above, in the search state where the B and Q f142 are moved by the drive signal output from the level shaping circuit 166, the switch circuit 147ff:
Tracking boo as off-state d? Is it possible to prevent tracking from occurring? The pickup 142 can be moved smoothly without being affected by this.

Here, when the pickup 142 is moved toward the outer periphery of the disk 140 as shown in ``2'', the pickup 142 returns to its original position IN (-1: 1↓^ in the above explanation)
The pickup position detection circuit 175 detects how far the pickup has moved from the current position 11t). This pickup position detection circuit 175, which will be described in detail later, generates 14 detection signals so that one pulse is generated every time the pickup 142 moves in the radial direction of the disk 1400 and crosses one track. This is what is output.

Therefore, the sliding rack calculation counter 16 sequentially counts the pulses of the position detection signal output from the pickup position detection circuit 175 in the reverse direction, starting from the previously set initial data. And the moving isokisho counter 1
6 generates the flow signal and outputs it to the monostable multivibrator 173 when the counter result becomes all "()". Therefore, the output of the monostable multivibrator 173 becomes f'1iArjL level, and thereby the output terminals of AND circuits 172 and 174 both become L level. . Therefore, the switching circuit 150
is switched to supply the output of the feed motor 1 circuit 149 to the big up feed 9 motor 43, the movement of the pickup 142 toward the outer circumference of the disk 140 is stopped, and the switch circuit 147 is turned on. What? ) A racking serve is applied. Then, the disc 140 is reproduced at the position where the pickup 142 has stopped once.

Here, the position where the pickup 142 has stopped is at a position 11 which is approximately equal to the target position 1N described above. That is, the first −υj set in the moving l calculation counter 16
data (as mentioned above, distance^1t data indicating the distance hv between the current position of the pickup 142 before the search operation and the target position).On the other hand, the data output from the front 112 pickup position detection circuit 175 The position 1d detection signal is
One pulse is generated every time the pickup 142 cuts one track on the disk 140 by f,:,+7, and the track pitch is 1.6 as described above.
Since it is [l1m], it basically shows the distance that Big Ala f142 has moved from its current position. Therefore, starting from the initial data set in the moving edge calculation counter 161, the pulses of the position extraction signal are sequentially counted in the reverse direction, and the fact that the count results are all "0" means that the transaction Pickup 142 without fixing
This is because it means that the object has moved by the distance between the current position and the destination position.

Therefore, logically, the position where the pickup 142 stops matches the target position, but in reality, the Q
Since there are variations in the 1tIi center of the disk 140 and track pitch, etc., the position is approximately equal to the target position 1if.

And then, J2N's Big Ag 142r yo Mae J/Is
The disc 140 is played back at the stopped position as shown in FIG. At this time, the R output from the pickup 142
F (fi number is separated into audio data and address data by the II process circuit 146, and the address data is stored in the current address memory 153. Absolute address and previous SL of new address data
The absolute address of the destination 1 output from the addition JT circuit 157 is the 1st and 21-2 position d1 calculation path 158.15
9 respectively in the subtraction circuit 160, and this new distance! 'll# data is set in the mobile calculation counter 161 as initial data. Here, the monostable multivibrator 173t is set to hold the L level for a sufficient time to perform playback at +i when the pickup 142 is stopped and to store the address data in the current address memory 153. There is. Then, when the output terminal of the grass stabilizing multivibrator 173 is returned to the H level again, the servo operation as in the previous step 51 is started again.

When the movement of the big up □up 142 gets old and stops in such a second search l'th operation, the pickup 142
F′i That stopping position W f Play! 1IIJf5'ft
: No, in the end, a series of searches M + IJ as described above.
The work is returned fυ.

Here, by repeating such a search operation, the absolute address of the current position of the pickup 142 outputted from the current address memory 153 and the absolute address of the target position outputted from the addition circuit 18157 become extremely equal, and the subtraction It is stopped when the time difference component output from the circuit 163 becomes smaller than the reference value of the numerical comparator 165. That is, the above class value comparator 1
When the time difference component outputted from the subtraction circuit 163 becomes smaller than the reference value, the first output terminal 65 is set to the 01iL level, and the second output terminal is set to the ox' (zH level).

Then, the output terminals of AND circuit 1'11.172 both become L.
level, so the switching time F ¥1150 is the multi-feed motor 1.
This is because the output of the iilJ control circuit 149 is switched to be supplied to the pickup feed motor 143.

Also, when the time difference component output from the subtraction circuit 163 becomes smaller than the numerical value of the numerical comparator 165, on the disk 140, it means that the difference between the current position 11 of the picker f142 and the target position is The number of tracks is the number of tracks, and the distance is the number (/m)
This is when I did the following.

Then, the second output terminal 0 of the numerical comparator 165
2 is set to H level, the front 812S-RFF circuit 1
Since the output terminal Q of 70 is also at H level, both output terminals OII
, Q are connected to the input terminals of the AND circuit 176, and the output terminal of the AND circuit 176 becomes H level.

Here, the second output terminal O of the numerical comparator 165
! When the is made to H level, the big af
142 is when the movement is stopped during the above-mentioned search operation and the address data at that point 1θ is read out, so the output terminal of the previous mlη1 stable multipipe rake 173 is set to L level. . Therefore, when the output terminal of this monostable multivibrator 173 is returned to the H level, the output terminal of the AND circuit 177 to which this output terminal and the output terminal of the AND circuit b'i; 176 are connected to the input terminal becomes H level. done to the level. Therefore, the kick noise generating circuit 162 is made smaller.

This kick pulse generator circuit 162 outputs a so-called kick pulse because it moves accurately by the number of 142 pieces of the front Mrr pickup, as will be described in detail later. Based on the distance #1 data, a kick pulse is generated to move the pickup 142 by a distance 9jf corresponding to the event data (several tracks). 167 based on the polarity signal output from the subtraction circuit 163.
The polarity and negative polarity are determined and supplied to the adder circuit 148. At this time, since the output terminal Q of the 5-RFF @ path 170 and the output terminal of the monostable multi-bi break 173 are both at H level, the output terminal of the AND circuit 124 is at H level.
Since the switch circuit 147 is in the OFF state, the tracking sensor? will not be applied.

After passing through the adder circuit 148, the kick pulse is supplied to the pickup feed motor 143 via the multi-feed motor 1ltlJ f+Ii1 circuit 149 and the switching circuit 150. At this time, the pickup 142 is moved several tracks and reaches the target position. Note that when the kick pulse is of positive or negative polarity, the pickup 142 is moved by several tracks in the outer and inner circumferential directions of the disk 140. When the pick-up 142 reaches the target position and reproduces that position, each absolute address t output from the current address memory 153 and the addition 1 circuit 167 becomes completely clear. Therefore, the pattern-number construction circuit 164 detects that the addresses of both criminals completely match, and the Ti1J S-1tFF circuit 1
The reset terminal RK of 70 outputs an H level signal fc.

Then, the 5-RFIi'' circuit 170 is reset and its output terminal Q is inverted to the L level, and the search operation is all completed here.Then, the output terminal Q of the S-4tFF circuit 170 is inverted to the L level. As a result, the output of the AND circuit 174 also goes to H level, and the switch circuit 147 is turned on to perform a tracking circuit, so that playback is stably performed from the target position output to 1: below. It will come to pass.

Next, details 1 of the pickup position detection circuit 175 will be explained. That is, this pickup position detection circuit 175 utilizes all the tracking error signals output from the tracking output circuit 145. That is, as shown in FIG. 3, the input terminal 178 to which the tracking error signal is supplied is
Leconno frector i 79 and output terminal 1 /? 0
*The mobile densitometer 1 is connected to the T counter 1 through the above.

That is, as mentioned above, the tracking error signal iJ1 has negative polarity and positive polarity due to the fact that the spot of the light beam on the surface of the disk 140 is shifted from the center of the track toward the inner circumference and outer circumference of the disk 140. This is a signal whose absolute value level changes depending on the magnitude of the deviation, and which is 0 level when the spot is located at the center of the track. Therefore, when the spot is moved in the radial direction of the disk 40 and crosses a plurality of tracks, the tracking error signal changes as shown in FIG. 4(a). Figure 4 (,)
In the figure, a period in which the tracking error signal is upward to the right in the figure indicates an area where tracking servo is possible, and a period in which the tracking error signal is upward to the left in the figure is an area in which tracking servo is not possible. For this reason, the tracking error signal between songs that is on the upper right side of the diagram) +/
Cross point p)', S']? y) H It is located at medium heat with the track of rrui11!-f 7Ji:.Therefore, one round j, Ii of this tracking error image rl has one spot σ) track)li '−
This is equivalent to 1JJ.

In this case, the above tracking error number 1 is set to 0 level by the 0 level converter 179. When No. 4M is generated, a Noyals waveform as shown in Fig. 4(b) is obtained.One period of this /f pulse waveform is equal to the force (one track). This corresponds to crosscutting block 4, so block 1?t is 1 on disk 140.
1 nogurusu will be generated in 4ft of the truck, and it will be the 4th tonden.

(Unfortunately, I'll look at the previous [1) Knokurusu company, No.51':<1
As shown in , when t1 raw start is requested at time TI,
A signal at a constant level with 1E polarity is output, and this is at time T.
2 and f4. The polarity is inverted to a signal with a polarity of 15 lbel, and the time T
3 returns to the original 0 level.

Then, at time T, the pickup no.
It started to be moved towards the outer circumference of 40, and that movement! The speed Iij reaches its maximum at time T2, and thereafter is sequentially decelerated by a signal of the shell 10 level, and the movement of the pickup 142 is stopped at time 'r3. For this reason, kick/'
The P pulse generating circuit 162° generates a predetermined track by setting the width t and rf4 from time T to T3 based on the distance 1'llll7j-even outputted from the subtracting circuit 160. It can be moved as many times as needed.

Here, the pick-up and pull-up 142 are
By applying the brakes and getting used to the movement in the outer circumferential direction, it is possible to prevent the pickup 142 from automatically moving to the target position due to responsibility, or causing damped vibrations before and after the target position, making it difficult to stop at the target position. Because you can, Big Ala FL
42f quickly move to the target position 1-, and then move to the target position h
'/: 'h: It is possible to place the image completely still on the t track.

Furthermore, when moving the pickup 142 toward the inner circumference of the disk 140, from time 11 to T! It is sufficient to set the period up to No. 48 at a negative polarity level, and set the signal from time 12 to T3 at a positive polarity level. Then, a kick is made to move the pickup 142 four times in the direction of the outer circumference of the second disk 140. The polarity reversing circuit 162 determines whether to output the pulse or the kick 2 pulse that moves the subtraction circuit 163 in the inner circumferential direction based on -V of the polarity signal output from the subtraction circuit 163.

Incidentally, the time T2 at which the positive polarity level is reversed from the negative polarity level and from the negative polarity level to the positive polarity level does not necessarily have to be at the center of time T and r8, but may be set at the pick-up 142 ft. , generate kick pulses as appropriate depending on the number of tracks to be moved, etc.
It is possible to set the limit to 62.

Therefore, according to the pooch means as shown in Figures 1) and 2, first, the radius of the disk 1400 of (i'f#j) is calculated from the absolute address of the current position of the pickup 0142, and the radius of the disk 1400 of the pickup 0142 is calculated from the absolute address of the current position From the absolute address, calculate the radius of the disk 140 at that position *, +11, and calculate the difference between the two (
distance data) to determine the distance to which the pickup 142 should be moved.

Then, the pickup 142 is rotated 4'Z tjdl, and every time the spot crosses one track, one pulse ylI' is generated.
The number of pulses of the generated position detection signal is counted, and when the moving distance 11 (t) of the pickup 142 becomes equal to the recording distance e+If data, the movement of the big gear f142 is stopped, so the system can be quickly and easily The pickup 142 can be accurately moved to the target position 17, and the performance of the surgical tool can be improved.

In this regard, the conventional search means Q operates as follows. First, when the target position (TNO) and the relative address within the song are specified, it is determined whether the target position 11/J is the inner circumference 11111 of the disc or the outer circumference 1i1ij with respect to the current position 1ffl of the pickup, and the pickup Move in the direction determined to be gold.

At this time, the focus servo and tracking servo are fully activated, and the address data is projected into the bubble by 1F7G even while the pickup is moving. Then, the pick is moved until the song number in the read address data matches the 11th 1v of the target position. Next, the pickup is moved at a slower speed until the "minute" digit of the relative address in the read address data matches the "minute" digit of the phase 1 address of the target position 1ti. move it. In addition, by further slowing down the moving speed of the pickup, the 1-second digit of the relative address in the protruding address field matches the second digit of the relative address at the destination position. The pickup is moved to the target position.

For this reason, even when the pickup is moving at its fastest speed, it must be fast enough to retrieve the address data, which poses a problem in that a quick search operation cannot be performed.

However, according to the search means shown in Figure 8PJ2, based on the distance AI data between the radius of the current position of the pickup 142 and the radius of the destination position, the pickup f142'fc is moved by that distance. There is no need to read the address booter while moving, and the pickup is 14.
2 can be moved faster, and a quick search operation can be performed.

It goes without saying that if a microcomputer is used, most circuits can perform their functions through program processing.

Furthermore, during the search operation, the drive signal output from the level shaping circuit 166 and the kick noise generating circuit 16.
Pickup 1 is activated by the kick pulse output from 2.
42 is being moved, the switch circuit 147 is set to the OFF state so that no tracking laser is applied. Isk 1
400 will be moved in the radial direction, with a circular fn movement 1
IIIffi can be done, and the purpose is a) to set the positive (i) at the γ position.
It will be moved to ff.

In addition, the 1 pick-up 142 digit 16 (Φ small signal is generated using the change in the tracking error No. 41 that occurs when the spot actually crosses the track 2, so the main 1? It is possible to generate one pulse at positive 4 tm every time the track is crossed, and reliable operation can be performed.Furthermore, the position/direction No. 46 is controlled by the tracking error fg M k O level converter 179. Since it has a pulse waveform, it can be realized with an extremely simple configuration.

In the above-described search operation t, 1, first, if the distance between the current position 1d of the pickup 142 and the target position is long, the drive signal output from the level shaping circuit 166 moves the pickup 142 greatly and the pickup 142 is moved. 1
42's current position 11') (and the distance between it and the destination position 16 is J
Since the pick-up 142 is moved to the target position by the kick pulse when it becomes inside the song, a quick and accurate search operation can be performed. .

In the DAI playback device having the above-mentioned basic configuration, the features of the present invention will be described below. In FIG. 6, the same parts as in FIG. 2 are designated by the same symbols, and only the different parts will be described here. That is, the absolute address of the current position tlN of the pickup 142 outputted from the current address memory J53 and the absolute address of the target position outputted from the adder circuit J57 are transferred to the @1 and second position measuring circuits J. 5 g, , 159, respectively, 1.
Memory exclusively for output to r (hereinafter referred to as ROM) 18J,
182. these)tOM 181118
2 stores fFji conversion tables for converting absolute addresses (temporal information) into radius data (distance information) of the disk 140 at predetermined m time intervals. These ROMs 181 and 182 output radius data corresponding to the input absolute address, and the radius data is subtracted by 1 by the subtraction circuit 160 to become the distance 1-11 data and sent via the output terminal 183. , is set as initial data in the moving count counter 161.

Therefore, the absolute address is n0V11B1.

Since the conversion table stored in 182 is used to convert the Y° diameter data, there is no need to perform calculations to convert each absolute address hill to radius data, which further speeds up the search operation. can,
This becomes suitable when a microcomputer is used for 'l'f as described above.

FIG. 7 shows a modification of FIG. 6.

That is, the absolute address of the current 1!7 position of the pickup 142 outputted from the current address memory 153 and the absolute address of the target position outputted from the adder circuit 157 are selected at the selection time II! ROM selectively by 3784
185. Then, one of the pairs of addresses f and n0 is converted into radius data using the conversion table stored in the M185, and stored in the buffer memory 186 at -4.
Make yourself remember.

Thereafter, it is converted into radius data using the other absolute address i ROM 1 B 5 selected by the selection circuit 184, and the radius data and the radius data stored in the buffer memory 186 are subtracted by the subtraction circuit 160. , the above-mentioned fil 7j-ta is obtained.

Then, as shown in FIG. 7, the ROM 185 becomes 1
Only one piece is required, and the construction of the coffin can be simplified.

It should be noted that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist of the invention.

〔Effect of the invention〕

Therefore, as detailed above, according to this invention,!
■In the disc record playback device 1 which records the digitized data and produces the disc,
A1 An extremely good disc record FIj that has an easy digit structure and a quick if M# search function.
raw material j+t, 1. , can be provided to.

[Brief explanation of the drawing]

Figure 1 shows the DAI of the CD system to which this invention is applied).
IIj Front external view showing the outline of the production equipment, Figure 2 T to D
The basics of the electrical circuit system of the AD playback device (showing 14 configurations!
Lock configuration diagram, Figure 3 0: Block diagram showing the pickup position detection circuit of the 1-ho circuit system, Figure 4 (a)
*(b) is a waveform diagram for explaining the operation of the pickup position detection circuit 'fr: Figure 5 is a waveform diagram for explaining the kick pulse of the same pickup position detection circuit, Figure 5 is a waveform diagram for explaining the kick pulse of the 11'iS system, and Figure d36 is this A block showing an example of the disc record r+4 production device ie according to the invention (a complete diagram; FIG. 7 is a block diagram showing a modified example of the same embodiment). 110...cabinet; 11]... Disk loading section, 112... Eject key, 113... No. 2 work key, 114... Display section, 115... Reverse key, No. 16... Fast forward key, 117...
...Play key, 118...Next level key, No.19...Repeat key, 120...Bose key, 1
21...Stop key, 122-13...Number keys, 132...Memory read key, 133...Memory key, 134...Clear key, 140...Disk, 14... Disc motor, 142...bi,
Kua, de, 143...big ara f tun simota, 14
4... Focus control i11 circuit, 145... Tracking side ji11 circuit, 146... Process circuit,
47...Switch circuit, 148...Additional, 1'J circuit, I49...Transfer motor division (11 circuits, 150...
・Cut 1 back circuit, 151...Lead-in data memory,
152°...DA & switching open circuit 53°°Current address memory, 154...Output p) M child, 155...
Is the key one j? 14.156...Target address memory register, 157...Power loss circuit, 158...First
position calculation circuit, 159... i4'72 digit fN, calculation circuit, 160... subtraction 1 circuit, 16 no... shift It)
lii: calculation counter, 162...kick noise generation circuit, 163...subtraction circuit, 164...mother turn coincidence detection circuit, 165...numeric value converter,
166... Level shaping circuit, 167... Polarity inversion circuit, 168... Search switch, 169... I# current source, 170... 5-RFF circuit, 171, 172
...AND circuit &'3, J y, q...medium stable multi-pie break, 174...AND circuit, 175...
・Pickup position 1d outgoing circuit, 176.177...
AND circuit, 178...input terminal, Noah 9°°・01
/Pel comparator, 180...output terminal, 1111
．． 1112...TtOM, 183...Output terminal, 184...Select circuit, 185...ROM,
I II 6...Buffer memory. L11 Axis agent Liristian Suzue Takehiko 311
3 Figure jI4WJ fs5 figure++ 12 13 Figure 6

Claims (1)

[Claims] In a disc record playback device that reads out digital data and temporal information sound via an optical pickup from a disc on which digital data formed as an information signal fePCM is recorded together with temporal information, the purpose for which the pickup is moved. temporal position 1u,
a setting means for setting the fief information; and a conversion table for converting the temporal fief information recorded on the disk into radius information of the disk every predetermined unit time is stored, and the temporal information is set in the setting means. and storage means for converting the temporal information read from the pickup into radius information of the disk, and subtracting each radius information converted by the storage means to calculate the current position of the pickup and the target position. subtracting means for generating distance data between and a drive signal for moving the pickup in the direction of the target position; and a distance by which the pickup is moved in the radial direction of the disk! ] A transfer amount detection means for generating transfer amount detection data corresponding to I;
The amount of movement output from this movement sensitivity detection means (detection block)
2. A disc record reproducing device comprising: floating means for stopping the pickup by an amount of movement corresponding to the distance data calculated by the subtracting means.