JPS583105A - Digital recorder and reproducer - Google Patents

Abstract

PURPOSE:To provide a simple operability and to give convenience for usage, by automatically forming a no signal part with a prescribed length only with the operation of a pause operator at recording and providing a time difference between the pause and its release. CONSTITUTION:In a PCM deck 20, a PCM processor 21 and a VTR for recording and rproduction are incorporatedly provided. The PCM deck 20 performs normal recording/reproduction, digital mixing recording with a VTR 23 externally connected to the VTR 22 with signal switching circuits 24-28, digital dubbing and function of PCM adaptor for recording or reproduction. When the PCM deck 20 is at recording state, if a pause switch SW4 is turned on, a digital recording mute signal is transmitted from a digital muting circuit 291 and the PCM deck 20 is a temporary halt state for recording with a delay for a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transmitting audio signals that have been digitalized, for example, converted into PCM (pulse code modulation), to a home VTR.
A system for recording and reproducing using a video tape recorder (Video tape recorder) This invention relates to a suitable digital recording and reproducing device.

Recently, as part of the transition to digital audio, so-called P
A commercial recording system has been developed. In other words, this input is sampled at a frequency that is more than twice the highest frequency of the (analog) audio signal band, is recorded as a P (M (a type of digital code) digital signal, and is converted back to an analog signal when played back. This system demodulates the original (analog) audio signal by removing components outside the audio signal band (go < t).

Figure 1 shows a conventional PCM recording system realized using a standard method based on the assumption that a home VTR can be used as a recording/playback device. VTR
12 and a second VTRI J for playback only are connected.

In other words, 1 PCM processor requires 11A of line manpower!
The (analog) audio signal supplied to the (LINE-IN) is converted into PGM (digital) as described above by an encoder, that is, a recording processing system, and then is converted to a PGM (digital) signal at the video output terminal (
vrngo -OUT, ).

This video output signal is supplied to the video input terminal (VID'FIO-IN, ) of the first VTR 12 and digitally recorded on a videotape. In addition, this first VTR1
The playback signal from 2 is output to the video output terminal (VIDBO-OUT
, ) and is supplied to the video input i (VIDFIO-IN, ) of the PCM processor 11.

Then, the PCM processor 11 demodulates the reproduced video signal using a decoder, that is, a reproduction processing system, and outputs it as an original (analog) audio signal to the line output terminal (LINFj -
0UT) to an external stereo playback device (not shown).

Here, in addition to the above-mentioned analog-to-digital conversion and digital-to-analog conversion techniques in its recording processing system and playback processing system, the PCM processor 11 uses a method to avoid the synchronization signal portion when recording digital data on a video signal. In order to compensate for signal loss due to dropouts, etc., time axis compression, decompression, interleaving, and decoding using memory-based delay circuit technology are used.
Interleaving technology etc. are adopted and used.

By the way, the PCM processor 77 and @1's VTR 1j as described above can only perform normal digital recording and playback, but by using other VTRs, functions such as so-called digital dubbing and digital dubbing recording can be performed. It is strongly desired to do so.

For this reason, conventionally, as shown in FIG.
An input terminal dedicated to copying (duplicate) is provided, and the second VTR is connected to this copy terminal (COPY-IN).
The copy mode is set only when a video signal for digital dubbing or digital dubbing recording is input from video output terminals (VIDEO-OUTs) 1 and 9. .

However, with this, digital dubbing and digital dubbing recording can only be performed from the second VTRI J to the first VTRJ 2;
In order to be able to do this with R, it would be necessary to change the connections, making it extremely inconvenient to use.

In other words, this avoids various problems caused by the fact that the video input signal applied to the video input terminal of a normal VTR is directly derived as a video output signal by the so-called IJFM function except in playback mode. This is an inevitable result of this.

In other words, to improve usability, the PCM processor 11
For the outer lc of the copy input terminal (COPY-IN) -
tLl' - Output end (Copy-oUT) (Set shown)
f') f') It is sufficient to provide f, but if it is only provided with the above-mentioned 88 functions, due to the nature of the video output terminal of other VTRs, it may be undesirable to use the mixing circuit included in the PCM processor 1 to interact with other VTRs. This is because a loop will be formed that will lead to the occurrence of a photo-shooting phenomenon.

This also applies to the case where you wish to perform other functions other than the digital dubbing and digital mixing recording described above, and it is necessary to give some consideration to the switching of monitors, etc.

Also, in this type of PCM recording system, in order to facilitate song selection, editing, etc., a no-signal area called a blank is created between songs. There is. In other words, in the conventional case shown in FIG. 1, first the recording mute (R113CMUTlit) provided in the PCM processor 11 is
Suin? (not shown) to set the data to be recorded to digital zero (0), and then
Pause for temporary stop (PA) provided on RJ2゜13 side
By operating a (USE) operator (not shown), a song interval of a required length is formed.

The reason why the recording mute switch is used to set the data to be recorded to digital 0 (zero) before operating the pause controller is to prevent the loss of music information due to dropouts during recording, as described above. This is for the purpose of avoiding the inconvenience caused by recording data on a tape after delaying and distributing data using the axial compression technique. In other words, especially when the input level is high and music signals are recorded so as to be connected at predetermined intervals simply by turning on and off the pause control, abnormalities tend to occur because the data are unrelated. This is because.

However, in order to eliminate this inconvenience, as mentioned above, for each metropolitan drama, first operate the recording mute switch on the PCM processor 11 side, then mute the first one.
Or the second VTR7,? , . Since extremely complicated operations such as operating the pose operator on the ls side must be repeated, there is a problem in that the usability is extremely poor.

The present invention has been made in view of the above-mentioned points, and it is possible to automatically form a no-signal portion of a predetermined length by simply operating a pause operator during recording. It is an object of the present invention to provide an extremely good digital recording/reproducing device which has simple operability and is easy to use by being configured to have a release/placement time difference.

That is, the digital recording/reproducing apparatus according to the present invention has P
This is a PCM (tape) deck type with a built-in VTR for both recording and playback purposes in the CM processor section.In particular, in the recording state, the pause signal generated by the operation of the pause operator is delayed for a certain period of time, and during that time the data is converted to digital zero (0). ) By setting the digital recording mute state, it is possible to automatically form a no-signal portion of a predetermined length, and also to enter a pause state with a certain time delay, and to immediately release the pause state for a predetermined period of time when the pause is released. The feature is that it is configured so that a recording mute state can be obtained. First, a basic example to which the present invention is applied will be explained.

That is, FIG. 2 (R) shows the basic structure of the basic hammer according to the present invention. - is PCM
Processor jJ and first VTR 22 for both recording and playback
are integrated internally. In this case, the PCM deck 20 connects the PDM processor 21 with a line input terminal (LI■-IN) and a line output terminal (LINEi-OUT) connected correspondingly to an analog audio signal source and a stereo playback device (not shown). have. In addition, the video input terminal (VI
DliilO-IN, □) Oyohihihiteo output ill
(VIDlilo-OUT, ) is the video output terminal (VIDlilo-OUT,
) and the video input terminal (WIDEIO-IN, ). Furthermore, the PMC deck 12 connects the PCM processor 21 to the video output terminal (VID) of the second VTR 23, which can be used for external recording and playback.
F)0-OUTs) and video input terminal (VID1
Copy input terminal (C
0PY-IN) and copy output terminal (COPY-OUT
)(!:have.

FIG. 2(b) shows a schematic layout of the panel section as an example of mounting the PCM deck 20 of FIG. 2(a), in which 20a is a power switch and 20b is a timer switch. Also,
20C is a VTR video cassette tape insertion section, and a front-loading type is adopted in which when a β code video cassette is set, it is automatically drawn in. 2gd and IOe are an electronic counter display section and a digital beak meter display section, respectively, which are integrated using a liquid crystal unit.

Furthermore, 20f to 20m are a group of key switches for control, and the eject (FIJIILCT) is from the left end.
), stop (8 TOP), rewind (R entry playback (P end Y)
Fast forward (PF), pause (PAUSEt), recording mute (nuc, MUTEt), especially (R) and (
A review (RBVIW) is performed by simultaneous operation of PLAY), and a cue (CUIil) is performed by simultaneous operation of (PLAY) and (F'F).

In addition, 20n to 20p are counter mode key switches, clear (CLBAR), stop (STOP), automatic playback (
AUTO-PLAY), and the same (2oq, 2or is bare (PEIARχ auto-play) with the meter mode key switch.
Dynamic (AUTO).

208 is a key switch for the built-in reference oscillator for full-scale calibration, 20t is a headphone jack, 20u is an output bell adjustment volume, and 20
v is the tracking adjustment volume, 20W is the cue and review speed adjustment volume, 20x is the slide line f (for function switching, recording enhancement switching, copy signal attenuator, and input switching)
A non-locking key switch is also possible), and 2
0Wm202 are the recording master volume and microphone jack, respectively.

Further, % (8Wl) is a key switch for mixing.

Note that the digital beak meter display section 20d may be configured to display tracking.

FIG. 3 shows one of the normally required left and right channels L and H as a specific example of each part shown in FIG. 2(a) (however, the operation system is omitted).

In other words, along with the reproduction processing system (P-P) described later, the PCM
The recording processing system (R@P) constituting the processor 21 performs necessary processing on the analog audio signal applied to the line input terminal (LINli!-IN) by a preprocessing section (not shown) and converts it into an analog-to-digital conversion circuit. 21m, and here it is accompanied by so-called attachment and encoding (P
CM) Digital signal number conversion. This digital signal is transmitted to a digital mixing circuit 21C and LS, which will be described later, which is made up of a parallel-serial conversion circuit 21b and a full adder circuit.
It is supplied to, for example, an LSI-based recording processing circuit 21e via the B-MSB conversion circuit 21d, and as described above, time axis compression, interleaving, etc., which are necessary when recording with the video signal added thereto, are supplied. After the processing is performed, the above-mentioned PCM processor 2 is used as the PCM deck 20.
The signal is supplied to a first VTR 22 for both recording and reproduction, which is built-in and integrated with the same.

Here, if the PMC deck 20 is in a recording state in the normal mode without copying power, which will be described later, the video signal as described above will be recorded as is in the built-in VTR 2J of @l.

On the other hand, if the PCM deck 20 is in the PLAY state, the built-in first VTR, ? The playback (video) signal from 2 is transferred to the first signal switching circuit 2, which will be described later.
The data is supplied to the playback/processing system (P-P) through the B contact of the switch circuit (8W-B) controlled by 4 and to the synchronization separation circuit 21f, where the synchronization signal separation and data separation are performed. After that, the signal is supplied to a reproduction processing circuit 21g formed into an LSI, for example. This reproducing circuit 21g derives a digital signal that has undergone processing such as time base expansion, digital interleaving, and data correction necessary for demodulation. The demodulated digital signal resulting from this is sent to the MSB-LSB conversion circuit 210.
and (B) of a switch circuit (8W-A) controlled by a third signal switching circuit 26, which will be described later, on a path passing through the digital mixing circuit 21 of the recording processing system (R, P) and the LSB-M8B conversion circuit 21d. It is supplied to the digital-to-analog converter zxi through the contacts and the serial-to-parallel converter 21h, where it is converted to the original analog audio signal and sent to the line output terminal (LINE-OU).
When derived from T), the common number is supplied to the meter circuit 21j and used for indicating peak values and the like.

In addition, in Figure @3, the AD/D controller 21 is a circuit that generates a signal to control the operation timing of analog-to-digital conversion, etc. of the recording processing system (R, P) and the reproduction processing system (p, p). .

By the way, in addition to the above-mentioned (normal) recording and reproduction, the PCM deck 20 is equipped with the first to fifth signal switching circuits 24, 25, 26, and 111°28 described below. The digital dubbing function between the first VTR 22 and the externally connected second VTR 23, the digital dubbing function, and the PCM adapter function for recording or playback can be performed reliably without forming an undesired oscillation loop. It is possible to increase the number of functions that can be achieved through operation, and to perform each function in a more desirable state by rationally switching the monitor and system clock signal sources accordingly.

First, the first signal switching circuit 24 is a PCM
Only when the deck is in the recording (REC) state and when there is copying power from the externally connected second VTR 23, the input system for the reproduction processing system (P, P) switches to the side where the copying power is accepted. At the same time, in any other state, the video output from the built-in first VTR 22 is switched to the input side.

In other words, when the copy input terminal (CopY-iN) detects whether there is a copy input terminal (CopY-iN) and the copy input terminal (CopY-iN) detects whether or not there is a copy input input from the sign detection circuit 241, which detects whether there is a copy input input terminal (CopY-iN) or not, and the PCM deck log record ( C) Level terminal (II')
An ant game that takes an AND with the REC signal from
) (Al, ), the switch circuit (5W-B) is switched to a state in which it can accept the input terminal (COPY-IN), i> input terminal (COPY-IN), and supply it to the data and synchronization separation circuit 21f. This is what we do. This copying force is then applied to one input end of the digital mixing circuit 21G in the same manner as described above.

In this case, the digital mixing circuit 21C has the aforementioned line input terminal (LINllil-IN) at its other end.
If a line input is being supplied from the VTR 23, the line input and the manual copying from the externally connected second VTR 23 are digitally mixed, and if the PCM deck 20 is in the recording state, the built-in 1st V
TR22 enables sophisticated digital mixing.

It is of course possible to digitally mix the playback output from the built-in first VTR 22 and the line input in accordance with the above-described manner, and perform digital mixing using the externally connected second VTR 23. In other words, the recording processing circuit 2 described above
The output of 1e is output from (a) a switch circuit controlled by a second signal switching circuit 25 (to be described later) located on the contact side, except during recording.
sw-C) via the copy output terminal (COPY-OUT'
), and the copy output from this is supplied to the video input terminal (V
ID1130-IN, )ζ is added.

In addition, the playback output (only) of the built-in first VTR 15-22 is transferred to the externally connected VTR @2.
2B, or conversely, a second VTR.
Of course, it is also possible to perform digital exchange between M1 and the 29'th VTR 22, 23 by recording (only) the reproduced output of Z3 in a 1:1 VTR 22.

Furthermore, it is also possible to use the PCM deck 20 as a PCM adapter for recording or playback, such as by using the line input to derive the playback output from an externally connected second VTR 2J as a line output. It is.

In addition, it is necessary to switch the output from the reproduction processing system port and the line input terminal (L
Switching of analog-to-digital conversion data etc. from INIit-IN) will be performed by third and $4 signal switching circuits 26 and 21, which will be described later. Further, in that case, switching of the system clock signal source will be performed by the fifth signal switching circuit 28.

FIG. 4 shows a specific example of a part of the first signal switching circuit 2416 in the above.
A switch circuit (8
It is connected to the fourth input terminal OY of W-B) and also to the input terminal of the signal detection circuit 241.

It has an operational amplifier OP1, and the negative phase input terminal of the operational amplifier OP1 is connected to resistors R2 to R and a capacitor ? Cs
, Cz are connected to a reference voltage circuit (8V) and a feedback circuit (FIB).

In addition, the output terminal of the operational amplifier OF1 is connected to the capacitor C1oC.
4% Two-man NAND gate NAN via waveform shaping port #8 (W8) consisting of diodes D, D, and resistor R6, and first and second inverters 11w and Is in series.
D, (corresponding to AND gate All in FIG. 3) is connected to one input end of the gate. The other end of the NAND is connected to the input terminal IN to which a 0 level signal is supplied when the built-in first VTR 22 or PCM deck 20 is in the recording state, and its output terminal The control input of the switch circuit (8W-B) and BJ are commonly connected through the output terminal of the signal detection circuit 241.

Here, the switch circuit (SW-B) is formed into an IC', and its first input terminal IX connects to the video output terminal VI of the built-in first VTR 22 via an inductance L1.
DFIO-OUT, and its third input terminal 7Y is connected to its first output terminal (X-COM), and its second output terminal (Y-COM) is connected to the current nuclear signal. The output terminal of the switching circuit 24 is connected to the data and synchronization signal separation circuit 21f of the PCM processor 2. In addition, the switch circuit (SW-B) is -1 & IJ
Both the control signal input terminal Ci and the second input terminal OX are grounded, and the channels corresponding to the logics that the control signal input terminals B and C can take or oX and oY are turned on.

So, the above IJ! In the configuration of the signal switching circuit 24 section of No. 1, the externally connected second VTR! ' If there is copy power from 3, the first inverter 1 of the signal detection circuit 141
1 output terminal is at ■ level, the output terminal of inverter 11 of the same gJ2 is at 0 level, and the same output terminal is at (G) level (however, when the input terminal IN port is in the recording state where it is at H level), that is, this copy The input terminals OX, OY@channels of the input terminal OX and OY are switched to the ON state l, contrary to the illustrated state, so that only the copying power is derived from the output terminal OUT.

Of course, in the case of normal mode where there is no copying power - contrary to the above description (as shown), the built-in first VTR
j j 7J), etc. will be derived.

By the way, if you need to set the PCM key L and switch the copy input terminal, (1) Copy the playback signal from the externally connected second VTR 2s to the built-in first VTR J. Recording (when dubbing digitally) 14! J - (2) The playback signal from the externally connected second VTR 2J is input to the line input terminal L of the built-in first VTR 2, 9.
When performing digital mixing recording with signals from INE-IN 7J) etc. (3) PCM processor 21, that is, PCM deck 2
There are three possible ways to use 0 as a PCM processor for reproducing the playback signal from the second externally connected VTRzs, but of these, excluding (3) because it is a special purpose as a PCM deck, there is no copying power required. , and the PCM deck 2o is in the recording state.

In other words, according to the first signal switching circuit 24 as described above, the copying system is disconnected except in the case of digital dubbing or digital mixing recording, so there is no need to disconnect the second VTR 2J. This can prevent the formation of undesired oscillation loops.

Next, regarding the second signal switching circuit 25, first the second signal switching circuit 25
The reason why the signal switching circuit 25 is necessary will be described below.

20- That is, if the first signal switching circuit 24ζ fails, it is true that the PC'M deck 20
- is in the recording state and the copying manual system is disconnected except in the case of digital dubbing or digital mixing recording where the copying manual is available, so it appears that undesired oscillation loops are not formed in that case.

However, if the first VTR 22 built into the PCM deck 20 only records the line input, the video signal to be recorded will still be sent to the copy output terminal C.
20th) VTR23 (D
Since the input terminal VIDBO-LN and Ic are supplied, as mentioned above, ordinary VTRs have the property that the current video input is directly output as the video output except during playback. As a result, there is a problem in that an undesired oscillation loop is ultimately formed.

In other words, the first signal switching circuit 24 only disconnects the copying power line when the mode is not in the copy recording mode, but only the PCM connection is disconnected when the mode is not in the copy recording mode. This is because, since the normal recording mode is also included, it is not sufficient to switch the copying system manually using the first signal switching circuit 24.

For this purpose, in the copy mode in which the first signal switching circuit 24 selectively switches and introduces the copying power from the externally connected second V'I'R2J, the 20th) V
It is necessary to provide a new second signal switching circuit 25 that automatically disconnects or mutes the copy output system for TRs 2 and 9.

Further, as this second signal switching circuit 25, PCM
7' When recording luck 20, the second externally connected
If the output system for the VTR 23 is cut off or muted, it is necessary to have an output mute function.

Next, the second signal switching circuit 25, which is constructed in consideration of one or more points, will be explained with reference to FIG.

That is, as shown in FIG. 5, the video signal from the recording processing circuit 216 included in the PCM processor 21 is transmitted via the differential amplifier 251 to the built-in first (7)
z (7) Hit;t Input nA VIDBO-IN
, 1C, and is also supplied to the copy output terminal C0PY-OUT via the buffer amplifier 252 consisting of an emitter follower transistor Q1, etc.; A second signal switching circuit j11 consisting of a transistor Q6 etc. which is switched by the RFIL signal which is at the company level in the distribution state of the PCM deck 20! ! 25.

This ζthus prevents the formation of an undesired oscillation loop under any conditions in conjunction with the first key number switching circuit 24 described above in a device that enables bidirectional digital dubbing and digital dubbing recording. This allows the PCM deck 20 to function as an output mute during recording.

23- Next is the third signal switching circuit 26, which is connected to the PC.
'@1 VTR with M deck 20 built-in line input
In other words, there is a normal recording state and a state other than playback (PLAY) and recording (REIC) (for example, stop: 5TOP, fast forward: F'F).

This is intended to prevent the formation of an undesired oscillation loop (including the case caused by the B11f output of the built-in first VTR 2!' itself) during rewinding (REW). - In this case, in addition to the normal recording described above, the PCM deck key 20 can also perform copy recording that records copying manually, and mixing recording of copying manually and line input, so consider each of these recording conditions. It is required to switch the signal system. It is also desirable to be able to monitor the EII output of the built-in VTR 2B, especially in the normal recording state.

In other words, the @3 signal switching circuit 26 takes into account the above points and connects the reproduction processing circuit 21g and the digital-to-analog converter wI (actually, the serial-to-parallel converter 21h) 21i. Connect the inserted line to the circuit 8W-A to the A contact on the NORMAL side or M
This is to switch to the B contact side on the IX side, but there are two cases in which it is necessary to switch to the A contact side, which supplies the output of the reproduction processing circuit 21g as it is to the digital-to-analog conversion circuit 221.

(1) When using the PCM deck 20 as a recording adapter (in this case, the built-in first V'I'R22
(2) When performing normal recording using the PCM deck 20 These conditions are cases where it is necessary to directly monitor the FIG output of the built-in first VTR 22.

In other words, switching the line circuit 5W-A to the NORMAL side is for the state in which PCM deck 2o performs normal recording (recording other than copy recording) and the state other than recording or playback (ST
OP, FP, R seats] and MIX
The state is switched to fill in other states.

The third signal switching circuit 26 is connected to the signal detection circuit 2.
Inverter II+ which inverts the output of 14, and the output of this inverter I11 and the iC signal from the terminal IN, which gives a (c) level at the time of RW. Inverter Ill and this inverter ■1
．． Terminal IN, which gives 0 level during output and PLAY, □
It has an AND gate ^, with the PLAY signal (actually obtained through the OR circuit OR1,) from the PLAY signal (actually obtained through the OR circuit OR1, In other words, (a) it is switched to the contact side.

In addition, when the switch circuit 5W-A is switched to the A contact side in this way, the regeneration processing circuit 21g
When the output from the circuit is input to the digital mixing circuit 21G, which is a full adder circuit, it forms a loop and oscillates.
■ Level output of the above AND gate ^, MSB-LSB
By applying the signal to the clear terminal CL of the conversion circuit 210 and setting it to a so-called digital zero (0), the state is the same as when the signal is turned off.

Note that the MSB-LSB conversion circuit 210 is necessary because the total addition in the digital mixing circuit 21C is performed serially starting from the LSB.

As described above, by the third signal switching circuit 26, P
When using the CM deck 201i as a recording PCM adapter and when performing normal recording, the BE small output playback processing circuit 21g from the built-in first VTR 2ff is used.
Otherwise, the output of the reproduction processing circuit 21g is supplied directly to the digital-to-analog converter 21i for monitoring via the digital mixing circuit J! Must H via r o
This makes it possible to supply the signal to the digital-to-analog converter 214 after it is in a state where digital mixing is possible, thereby ensuring that each of the above-mentioned functions can be performed without any problems. . □ ゛Next is the signal switching circuit 27 of @4, which in the above-mentioned normal recording state will switch the output of the analog-to-digital converter circuit 21m to digital mixing regardless of whether the mixing switch SwI is on or off. This is to allow the signal to be input to the circuit 21c, thereby allowing normal recording and digital mixing (recording) to be performed rationally and favorably.

In other words, in this type of device, the recording volume R11)C-
It is conceivable to use the switch Swf that is linked to VR to set up the mixing mode without providing a mixing switch, but in such a case, an inconvenient situation as described later will occur, so it is still necessary to use the mixing light f8. It is necessary to provide However, if a mixing light is simply provided, an unreasonable situation will arise in which the mixing light must be turned on even in the normal recording state, which is not originally a mixing mode. The role of the fourth signal switching circuit 27 is to prevent this from happening and to make normal recording and digital mixing (recording) reasonable and good.

In other words, even if the mixing switch is not installed, the copy mode is set when the copying power is available and the recording volume RBC-VR is set to the maximum setting, and the mixing mode is set when the copying power is available and the recording volume RFIC-VR is turned up. It is possible to do so.

However, the line input terminal LIN of the PCM deck key 20-
B-IN and line output i LINK-OUT$i are connected to an amplifier, etc., and it is considered that a signal is always input to the line input terminal LINE-IN. Also, PC
The M deck 20 is also capable of mixing playback, but if it is configured to use the recording volume REC-VR to obtain the mixing mode as described above, even during normal playback, if the recording volume RTilC-VR happens to be raised. The device enters mixing playback mode, and sounds that are difficult to hear are played.

Therefore, to avoid this, the mixing switch SwI
However, simply doing so would lead to an unreasonable situation when performing normal recording as described above.

For this reason, the signal switching port j1327 of '@4 is an OR game (ORII) that takes the OR between the output of the AND gate A11 mentioned above and the output that is supplied from the mixing gate S through the T flip-flop FF%, and this OR game). ORI
AND gate A1.I and the output of the recording volume circuit RFC-VR. By applying the output of AND gate No. 4 to the clear terminal CL of the parallel-to-serial conversion circuit 21b in the recording processing system 1, the output from the analog-to-digital conversion circuit 21m is converted to the digital mixing circuit 21C. It controls on/off the input to the

In other words, when the mixing light switch S is off in a state other than normal recording, the analog-to-digital conversion data is converted to digital zero (0), and the level output is converted from parallel to serial to the above AND gate. circuit 21b
Apply to the clear terminal CL.

In addition, in normal recording (recording other than copy recording), the above digital zero (0) is forcibly canceled, and the analog-to-digital conversion data is can be input to the digital mixing circuit 1lJc. In this case, the normal recording (detection) signal given as an output to the AND gate is at 0 level, and the output of the recording volume circuit RBC-V is also at (B) level because the volume is increased. . (Incidentally, the switch vortex linked to the volume is turned on when the volume is fully turned down.) As described above, the fourth signal switching circuit 27 controls the recording volume even if the recording volume R11tC-
Even if the V sub f is raised, if the mixing light is turned off, it is possible to prevent unrelated music signals from being mixed and played. In other words, it is possible to automatically input line input, so that normal recording can be performed without failure, and thus normal recording and digital mixing (recording) can be done rationally and well. become.

Figure 6 shows the signal switching circuit 2 of the third right and @4 in the above.
A specific example of the 6.2fI section is shown.

First, the third signal switching circuit 26 section will be explained.
An and gate similar to that shown in the figure.

The output from is the input end, ~ gourd and the positive and negative phase output end Q,
, Q, ~Q, ,Q, are supplied to the four input terminals of a timing circuit 261 consisting of an integrated circuit D-type flip-flop. The output from the output terminal Q of this timing circuit 261 is the IC switch circuit SW--the control terminal Sl! ! M is supplied to L and is converted into an IC.
It is supplied to the clear terminal CL of the SB-L8B conversion circuit 8210.

Here, the switch circuit 5W-A connects its output terminal 3Y to the control terminal 81i! If L is (relevel), an IC-based reproduction processing circuit added to the input terminal 3A side z z
The output of g is derived, and if it is at (b) level, the recording processing system R, which is added to the input terminal 3B side, and the POIC L
The output of the SB-MSB conversion circuit 21d is derived.

Further, the MSB-L8B conversion circuit 210 converts the output of the IC-based reproduction processing circuit 21g into an I/O mode suitable for addition in a digital mixing circuit 21G consisting of a full adder circuit.
This is derived by converting B to LSB, and if the level of the clear terminal CL is, a digital zero (0) is given as the converted output.

Note that the digital mixing circuit 21C is connected to the recording processing system R,
The analog-to-digital conversion data from the IC-based analog-to-digital conversion circuit 2111 and the parallel-to-serial conversion circuit 21b constituting P is supplied from the LSB side to the other end of the input terminal, and the addition output is
It is applied to the input terminal of the LSB-M8B conversion circuit 21d converted into C.

Further, the output from this LSB-MSB conversion circuit 21d is applied from the MOB side to the input terminal 3B of the IC-based switch circuit 5W-A, and also to the input terminal of the IC-based recording processing circuit 21e. It is being

Next, the fourth signal switching circuit 821 will be explained.
The output from the AND gate ^ which is the same as that shown in FIG. Then, Q+ of this timing circuit 261
The output from the output end is the parallel output of the recording processing systems R and P.
A clear terminal C of the serial conversion circuit 21b is applied.

Here, the 1 parallel-to-serial conversion circuit 21b provides an output of digital zero (0) as analog-to-digital conversion data when the clear terminal CL is at the (6) level.

Next, the 5th function necessary to perform each function such as 1 or more.
The signal switching circuit 28 will be explained. In other words, this can be achieved by rationally switching the signal source of the system clock signal necessary for normal operation of the recording processing circuit 21e, the reproduction processing circuit 2111, and the built-in VTR '@l. It is intended that each function can be performed in a more desirable state.

In other words, the conventional PCM processor uses the voltage-controlled oscillator ■CO included in the phase-locked loop PLL circuit (technology) of the playback processing system as the system clock signal source in playback mode and copy mode, and (normal) recording. It was said that a crystal oscillator was used only in the case of mode, but
'8g1 VTR2J built in PCM deck 20
? Since it is possible to operate the PCM processor 21 and the PCM processor 21 synchronously with the same crystal oscillator, such switching of the system clock signal source between the CO and the CO is avoided.

By the way, if it is necessary to switch the system clock signal # to the VCO side as PCM deck 2, (1) copy the playback output (copy manual power) of the externally connected second VTR to the built-in first VTR (copy recording). (2) When doing digital dubbing (2) Mixing the playback output (copying manually) of the second externally connected VTR with the line input and mixing it with the built-in @1
When recording with a VTR (3) Second VTR connected externally
TR playback output (manual copying) f PCM deck 20
There are three states when used as a playback PCM adapter that performs playback processing and directly derives from the line output.

As a result, the system clock signal trace is switched to the VCO side only when the 8 PCM deck main ± is in the recording R11iC state, and in other states, it is switched to the crystal oscillator side, and the latter is the crystal oscillator side. In this case, it is synchronized as a system clock signal source for the built-in first VTR.

In other words, the signal switching circuit 28 of '@5 is switched to the A contact side or the B contact side by the output of the AND gate 8, which is shared with the first signal switching circuit 24.
D%, and in order to satisfy the above conditions, the system clock signal source is switched to the crystal oscillation gain X''TAL-O8C side or the voltage controlled oscillator VCO side, and the system clock signal is given to the recording processing circuit 21e and the reproduction processing circuit 21g. .

In this case, the voltage controlled oscillator VCO is included in the phase locked loop PLL constructed in the P, P data and synchronization separation circuit 211 section of the reproduction processing system.

Further, the output of the crystal oscillator X''1'AL-O8C is also supplied as a system clock signal to the built-in first VTR 2H via a frequency divider 211.

As described above, the fifth signal switching circuit 28
When the deck 20 is playing, the PCM processor 21 and the built-in first VTR 22 are synchronized with the output of the crystal oscillator X'TAL-O8C, which is the same system clock signal source, and the externally connected VTR @2 The system clock signal source can be switched rationally by using the voltage controlled oscillator vCO output as the system clock signal source when the PCM decoder is in the recording state and the PCM decoder is in the recording state, thereby making each of the above functions more desirable. What can be done in a state becomes achievable.

FIG. 7 shows a specific example of the fifth signal switching circuit 28 shown in FIG.
The signal detection circuit 241 and the NAND game (which are shared with the case of 4) output directly or inverter 1.
is applied to one end of each input of a switch circuit 5W-D consisting of an AND-OR select gate. Here, the switch circuit 5W-D consisting of an AND-OR select gate has its other end supplied with each output from the crystal oscillator X'TAL-080 or the voltage controlled oscillator vCO correspondingly, and from its output end. Only when there is a copy signal as a system clock signal and the PCM deck 20 is in the recording REC state, the output of the voltage controlled oscillator CO is derived, and in other cases the output of the crystal oscillator X'TAL-OSC is derived.

Figures 8 to 15 show the PCM deck 20-
The signal system for each function (the diagram shows thick i!i!i).

Figure 8 shows a case where the PCM deck 1 is used as a recording PCM adapter, and the PCM deck 20 (in other words, the built-in first VTR 22 and the following) is in the 5TOP state, and the externally connected second VTR 23 is in the 5TOP state. This is achieved by setting the state to R113C.

In this case, when the mixing light attached to the PCM deck is in the OFF state, the copy output terminal (C!0PY-
Since no signal is output from the line output terminal LINE-OUT) and the line output terminal LINE-OUT, it is necessary to turn it on. In other words, the mixing light SwI has the same function as a monitor switch.

Figure 9 shows the case where the PCM deck 20 is used as a PCM adapter for playback, and the PCM deck 20 is connected to the RFIC-PA.
2nd VTR 2 in USB B state and externally connected
This is achieved by putting 3 into the PLAY state. In this case, PCM deck zo 6 REIC-PAU
8Pi state is the same state as copy recording,
PAU8F! The @ state will be canceled after a certain amount of time. Further, in this case, mixing reproduction is also possible by turning on the corner of the mixing glitch.

Figure 10 shows a case where the PCM deck 20 performs normal playback, and the second VTR 23 externally connected records or copies the playback.

In this case, even in normal playback, the copy output groove copy-O
Since the signal is output from the UT, the mixing light is kept in the off state.

Figure 11 shows mixing playback on PCM deck 20.
This is a case where recording is performed using the second externally connected VTR 2B. In this case, the mixing switch SWi is turned on.

The 12th south case is for normal recording RPC with PCM deck 20. In this case, the mixing right corner y may be in the on or off state.
The VTR 23 is in the s'rop state.

FIG. 13 shows the case of copy recording REC using "PGM deck l". In this case, the mixing light SW is turned off, and the externally connected second VTR 2J is turned off.
Set to Y state.

Figure 141 is PCM deck-20Q mixing recording-4
0 = RBC is performed. In this case, the mixing light f8W is turned on, and the second externally connected node V'I'
R2j is in the PLAY state.

FIG. 15 shows a case where the PCM deck 20 performs a queue CUEI or a review RBYIEIW. In this case, the externally connected second VTRj 3 is in the RBC-PAUSE state, but signals are output from the copy output terminal C0PY-OUT and the line output terminal LINK-OUT.

Next, an embodiment of the present invention, which is a further development of the basic example described above, will be described.

That is, in FIG. 116, the parts configured similarly to the basic example of '@3 causes are given the same reference numerals and their explanations are omitted. In this invention, the recording processing system (R, P)
It is characterized in that it includes a recording mute circuit 29 that is added to the recording mute circuit 29.

The recording mute circuit 29 includes a digital mute circuit 291 inserted between the LSD-MOB conversion circuit 21d and the recording processing circuit 21e, and a switch drive circuit 292 that controls the digital mute circuit 291. .

In addition, each switch drive port 175292 is a non-locking type recording mu) (RliiC-MUTI!
i) The switch (positive) and the pause (PAUI) switch ((SW4) are connected.

Here, the recording mute (RlilC-MUTEI) switch P (SW3) operates the switch once and operates the digital mute circuit 29 from the switch drive circuit 292 for an arbitrary period until it is released. ), it is for manual recording mute.

Also, the pose (PAUS g) swing f (S pull) is P
The first V'l'R22 built in the CM processor 11
This switch is linked to a pause operator (not shown) for playback (PL).
A pause (input) signal that causes the first VTR 22 to immediately enter the pause state when turned on in the AY) state is derived from the switch drive circuit 292. Then, the switch (
8) is turned on in the recording (REC) state, a pause signal that puts the first VTR 22 in the pause state after a certain period of delay, and a digital mute circuit 291 during the above delay period outputs a digital zero (0). A digital recording mute signal for recording is derived from the switch driving circuit 292. Furthermore, in the pose state, Bose swing y-(8%
) is turned on, the pause release signal is immediately derived from the SIN drive circuit 292, and the above-mentioned recording mute signal is derived for a predetermined period.

FIG. 7 shows a specific example of the switch drive circuit 292 mentioned above, and FIGS. 18(a) and 18(b) similarly show different specific examples of the digital mute circuit 291.

First, to explain the drive port Wr292 in FIG. 17, the PCM deck 20- records (R1flC'
) recording mute (RFfCM) at any point in the state.
When the UTE) switch (SWs) is operated, a digital recording mute signal is sent out via a hold circuit (H**) and an OR circuit (OR2, ) formed by combining a Schmitt trigger and a flip-flop, for example.

43- Is this digital recording mute signal the next recording mute switch? This continues for an arbitrary period until (8Wl) is operated, thereby completing the normal recording mute operation for manually obtaining digital zero (0) for a desired period. This is shown in (a), (s, (n)) of the timing chart shown in FIG.

This is shown in the middle part of (0).

Also, if the pause (PAUSE) switch is turned on at any time when the PCM recorder is in the recording state, for example,
(NANDI t ) and -y y thea4) (ell
) and i anti(1%+).

(Rzt) connected as shown in the figure, a mono multivibrator (1), a capacitor (Cx) and a resistor (
Differential circuit (D!1)-T consisting of “Is)(R*+)
A hold circuit (H!1) consisting of a flip-flop, an inverter (I112) to (Iz, ), and an or game)
The above capacitor (ex
t) and resistance (Rxt) = C21,
A pause (input) signal is sent out after a delay of 1% r. (However, it is assumed that the transistor (TRIll) is in the OFF state.) As a result, the PCM deck 20 enters the recording pause state (RlitCPAUSE state). During the delay period leading up to this, the mono multivibrator ( The digital recording mute signal is sent out even during the delay period by applying the above-mentioned or game (or game) (O crow 1) #) output via the inverter (Its). In other words, it is possible to perform an operation (one-touch method) to automatically obtain digital zero (0) for a certain period of time. It is convenient for

If the pause switch (8) is turned on again at any point in the R11iiCPAU8B state, the pause (input) signal is immediately sent out without being delayed for a certain period of time, and this causes PCM deck 1. is released from the pause state and placed in the REC state again. In this case, since the transistor (T)%s) is in the on state, the time constant is now 1//R
The digital recording mute signal is sent for a period of 1* (for example, several tens to several hundreds of meters, 5ec). This prevents the beginning of the music signal from being overwritten and completely prevents the occurrence of abnormal sounds.

In addition, if the pause switch (SW, ) is turned on while the PCM+20 is in the playback (PLAY) state, it will be immediately put into the pause state, and the next pause switch (C3W4) will be turned on. The pause state will be canceled immediately. Even when this is released, the recording mute signal is output for a period of T above. This is to automatically create a digital zero (0) between songs even when digital tapping is performed.

In any case like this, the Bose switch
If (SW, ) is operated, a certain period of time (Tt or T,
) A digital recording mute signal is sent out to obtain a digital zero (0).

The above is based on the timing chart shown in Figure @19)
This is shown in the front and rear parts of (O).

FIG. 18 shows a specific example of the digital mute circuit 291 in the above.
For i), data is directly applied to one input terminal, and a recording mute signal is manually applied to the other terminal via an inverter (In), while there is a recording mute signal from the output terminal of the AND gate (Aas). The middle data is set to digital zero (0), and an output is taken out which allows the data to be derived as is when there is no recording mute signal.

In addition, (b) is a zero-cross detector (ZIP,) that directly adds data to one input end of the Antogame) (At,) and manually detects the zero-cross point of the data at the other end.
A D flip-flop (F
Since the sail is designed to add the Q output of F+), in this case, in addition to (a), muting is applied at the zero-crossing point of the data, which can effectively prevent the occurrence of so-called popping noise. It has advantages.

47- The digital mute circuit 2291 described below may be configured to be included in the recording processing circuit 21e.

It goes without saying that the present invention is not limited to the embodiments described above and illustrated, and that various modifications and applications can be made without departing from the gist of the invention.

Therefore, as described in detail above, according to the present invention, it is possible to automatically form a no-signal portion of a predetermined length by simply operating the pause operator during recording, and also to provide a time difference between pauses and their release. With this configuration, it is possible to provide an extremely good digital recording and reproducing device that has simple operability and is easy to use.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a conventional PCM recording system, FIG. Mounting 48 of the PCM deser section in a) - A panel layout diagram showing an example, @3 is an explanatory diagram of the configuration of each part showing the specific example of FIG. 2 (a), and FIGS. 8 to 15 are signal system diagrams for each function of FIG. 3, and FIG. 16 is an illustration of an embodiment of the present invention. A configuration explanatory diagram showing
17 and 18 are configuration explanatory diagrams showing specific examples of the recording mute circuit section of FIG. 16, and FIG. 19 is a timing chart for explaining the operation of FIG. 17. 20... PCM deck, 21... PGM processor, 22... (built-in), :VTR, 23... (external V
TR, 24-28... Signal switching circuit 1, 29... Recording mute circuit, 291... Digital mute circuit,
292...Switch drive circuit, 8...Recording mute switch, SW,...Pause switch

Claims (1)

[Claims] A first means is formed by internally connecting a VTR to a PCM processor, and transmits a pause signal delayed for a certain period of time when a pause switch is operated in a recording state, and a recording mute is provided during this first intermediate delay period. A second means for transmitting a signal, and a third means for transmitting a pause release signal immediately when a pause switch is operated in a recording pause state, and a mute signal delayed for a certain period of time. A digital recording and reproducing device characterized by: