JP2901809B2 - Digital signal recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a plurality of digital magnetic tape devices such as an R-DAT (Rotary Head Digital Audio Tape Recorder) and records a plurality of audio signals such as audio signals in synchronization with each other. The present invention relates to a synchronous operation device of a plurality of digital signal recording / reproducing devices that can reproduce.

[0002]

2. Description of the Related Art A rotary head digital audio tape recorder (hereinafter, referred to as DAT) has been developed as a device for recording an audio signal such as an audio signal as a digital signal on a magnetic tape using a rotary head. In such a DAT, subcode information such as an absolute time (A-Time) from the start of recording of the magnetic tape and a time (P-Time) from the start of each recorded program is also used as a main signal such as an audio signal. Are recorded separately on the same track. Thereby, the above-mentioned subcode information can be easily recorded.

[0003]

However, in the above-mentioned conventional configuration, when recording / reproducing sound sources of a large number of channels, a multi-channel analog tape recorder or a digital tape recorder exists. However, there is a problem that the recording time is short and the recording time is short.

On the other hand, DAT is characterized by high sound quality, long recording time (2 hours in standard play (SP)), and a small medium cassette. Therefore, D
Record and synchronize multiple channels using multiple ATs
If it can be reproduced, it can be cheap and small. However, it has not been possible to record and reproduce in a synchronized manner by an operator's manual operation.

[0005]

In order to solve the above-mentioned problems, a digital signal recording / reproducing apparatus according to the first aspect of the present invention uses a sub-code signal such as an absolute time and a main signal such as an audio signal on a magnetic tape. In a digital signal recording / reproducing apparatus for recording / reproducing and having a search servo mechanism, a plurality of digital signal recording / reproducing apparatuses are used, and one digital signal recording / reproducing apparatus selected from the digital signal recording / reproducing apparatuses is used.
A transmission means for outputting a sub-code signal and a status signal indicating an operation state of the master unit to a slave unit other than the master unit as a digital signal recording / reproducing device at the time of recording or reproduction is provided in one of the master units. A first control unit for controlling the slave unit so as to record the sub-code signal together with a main signal; and a detection unit for detecting an operation state of the slave unit and outputting the operation state to the master unit. And a second control means for controlling the master unit based on a signal from the detection means.

According to a second aspect of the present invention, there is provided a digital signal recording / reproducing apparatus which records and reproduces a subcode signal such as an absolute time and a main signal such as an audio signal on a magnetic tape. In a digital signal recording / reproducing apparatus provided with a search servo mechanism and a capstan servo mechanism, a plurality of the digital signal recording / reproducing apparatuses are used, and recording is performed on one master unit selected from the digital signal recording / reproducing apparatuses. Or, at the time of reproduction, there is provided sending means for outputting a subcode signal and a status signal indicating the operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and the subcode signal First control means for controlling the slave unit so that the slave unit is recorded together with the main signal is provided. With detection means for are provided,
A second control unit for controlling the master unit based on a signal from the detection unit is provided, and compares a subcode signal from the master unit with a subcode signal reproduced in the slave unit during reproduction. Comparing means for detecting the difference by using a signal from the comparing means, and controlling the capstan servo mechanism to reduce the difference based on a signal from the comparing means.
It is characterized in that control means is provided.

According to a third aspect of the present invention, there is provided a digital signal recording / reproducing apparatus for recording / reproducing a sub-code signal such as an absolute time and a main signal such as an audio signal on a magnetic tape. In a digital signal recording / reproducing apparatus provided with a search servo mechanism and a capstan servo mechanism, a plurality of the digital signal recording / reproducing apparatuses are used, and recording is performed on one master unit selected from the digital signal recording / reproducing apparatuses. Or, at the time of reproduction, there is provided sending means for outputting a subcode signal and a status signal indicating the operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and the subcode signal First control means for controlling the slave unit so that the slave unit is recorded together with the main signal is provided. With detection means for are provided,
Second control means for controlling the master unit based on a signal from the detection means is provided, and at the time of recording, the master unit and the slave unit move the magnetic tape from a position returned by a predetermined distance from a set position at which recording is started. A fourth control means for controlling the start of the traveling of the vehicle is provided.

According to a fourth aspect of the present invention, there is provided a digital signal recording / reproducing apparatus for recording / reproducing a sub-code signal such as an absolute time and a main signal such as an audio signal on a magnetic tape. In a digital signal recording / reproducing apparatus provided with a search servo mechanism and a capstan servo mechanism, a plurality of the digital signal recording / reproducing apparatuses are used, and recording is performed on one master unit selected from the digital signal recording / reproducing apparatuses. Or, at the time of reproduction, there is provided sending means for outputting a subcode signal and a status signal indicating the operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and the subcode signal First control means for controlling the slave unit so that the slave unit is recorded together with the main signal is provided. With detection means for are provided,
A second control unit that controls the master unit based on a signal from the detection unit; an output unit that outputs a rotation frequency and a phase of the rotary head to the slave unit; The machine is provided with fifth control means for controlling the rotary head of the slave unit based on a signal from the output means.

[0009]

According to the first, second, third, and fourth aspects of the present invention, when each main signal such as a multi-channel audio signal is recorded in each of the master unit and the slave unit, Since the operation state of the master unit is output to the slave unit using the transmission unit, the master unit is operated to transmit a subcode signal from the transmission unit to the slave unit using the first control unit. It is possible to record with the signal.

With this configuration, when reproducing each main signal of a multi-channel or the like recorded in each of the master unit and the slave unit, the operating state of the master unit and the subcode signal are transmitted using the transmission unit. By being output to the slave unit, the master unit can be operated to control the magnetic tape of the master unit at a position indicated by a predetermined subcode signal by the search servo mechanism of the master unit, and the search servo mechanism of the slave unit can be controlled. Thus, the magnetic tape of the slave unit can be controlled at the position indicated by the subcode signal.

Therefore, in the above configuration, the master unit and the slave unit can be reproduced from the respective magnetic tape positions where the same subcode signal is recorded by the detection means and the second control means.
Synchronous reproduction of each main signal recorded in each parent device and each child device becomes possible.

Further, according to the configuration of the second aspect, since the comparison means and the third control means are provided, a difference in reproduction between the master unit and the slave unit due to elongation of the magnetic tape or the like can be eliminated. Even in the case where it occurs, the difference can be adjusted and the difference can be avoided.

In addition, according to the configuration of the third aspect, for example, when recording another main signal subsequent to the recording area on a magnetic tape on which a predetermined amount of the main signal is recorded, By the fourth control means, the magnetic tapes of the master unit and the slave unit can be started from the position where the master unit and the slave unit are returned by a predetermined amount in the area for recording the main signal. As a result, a pre-recorded sub-code signal can be used, so that the main unit and the slave unit can be synchronized and each main signal can be continuously recorded on the pre-recorded magnetic tape area. is there. Therefore, the continuity of each subcode signal between the master unit and the slave unit can be maintained.

Further, according to the configuration of the fourth aspect, the rotation of the rotary heads of the master unit and the slave unit can be synchronized by using the output unit and the fifth control unit. At the time of recording, each main signal can be recorded together for each track. Therefore, at the time of reproducing each of the main signals recorded as described above, the main signal recorded on each track of the master unit and the slave unit is controlled only by controlling the running of the magnetic tape by the capstan servo mechanism. Can be synchronized and played.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In the digital recording / reproducing apparatus of the present embodiment, a plurality of rotary head type digital audio tape recorders (R-DATs, hereinafter referred to as DATs) for recording audio signals such as audio signals as digital signals on a magnetic tape using a rotary head. For example, as shown in FIG. 3, four units are used. Therefore, 4
When one of the DATs 1a to 1d is used, it is possible to record and reproduce a main signal such as audio data of 2 (L, R) × 4 = 8 channels. These DATs 1a to 1d have the same configuration and the same function as shown in FIG.

In each of the above DATs 1a to 1d,
Although not shown, a predetermined distance (Min. 10
A blank of 0 mm) is provided, and after the blank, a U-TOC, which is a TOC (Table Of Content) for the user, is provided for a predetermined time, for example, 18 seconds.

Further, in each of the DATs 1a to 1d, after the above-mentioned U-TOC, each subcode signal and a main signal such as an audio signal are recorded in one track of the magnetic tape. As the above subcode signal, time code information (A-Time) which is an absolute time from the end of the U-TOC as a starting point, a time from each program such as a start of each music (P-Time), etc. Can be mentioned. ATF signals for ATF servo, which will be described later, are also recorded at two locations before and after each track on the magnetic tape.

As shown in FIG. 2, each of the DATs 1a to 1d includes a main body 1 for recording or reproducing digital signals on a magnetic tape stored in a DAT cassette as a recording medium, and a DAT 1a. And a connection section 24 serving as connection control means in connection between the first and second connections.

A main body 1 includes a mechanical section 2 having various driving members such as a rotary drum on which a rotary head is mounted, amplifiers 3 and 4 for recording and reproduction, a servo control circuit 5, and a bit converter. A modulation / demodulation circuit 6, a system microcomputer 7 serving as central control means, a system control circuit 8 for generating a drum synchronization reference signal (hereinafter referred to as a DRUMSYNC signal) and an LR clock, and a system control circuit 8 between the system microcomputer 7 and the system control circuit 8. And a sub-code generation circuit 9 connected to the sub-code generation circuit 9.

Further, the main body 1 has a RAM 10 on which a reproduced digital signal is written and which has a storage capacity of 2.times.64 kbits, and an input terminal A for recording signals.
/ D converter 11, D / A with output terminal for reproduction signal
A converter 12, each of the A / D and D / A converters 11
A signal processing circuit 13 having an input / output terminal for digital signals, a key input means as an input means for operating the DAT, and a key / display section 14 for performing various displays.

The mechanical section 2 includes a drum motor (not shown) for driving the rotary drum, a capstan motor 15 shown in FIG. 7B for driving the capstan, and a high-speed running of the magnetic tape during a high-speed search. And a reel motor (not shown).

The servo control circuit 5 includes a capstan drive circuit 16 for driving the capstan motor 15 and a servo mechanism (not shown) for controlling the drum motor and the reel motor.

The capstan motor 15 is controlled so that the magnetic tape travels at a predetermined traveling speed, for example, 8.15 mm / s at the time of recording, but at the time of reproducing, the above-mentioned ATF (Automatic Track Following) is used. By servo
In order for the rotating head to accurately trace each recorded track, the speed is changed within a predetermined range around the running speed and servo-controlled.

Each of the master DATs 1a and the slaves DATs 1b to 1d is provided with a search servo mechanism for performing a high-speed search of each track, for example, in order to easily find the beginning of each program. Such a search servo mechanism uses the servo control circuit 5 to
By controlling the rotation of the reel motor (not shown) and the drum motor (not shown), a desired track of the magnetic tape can be searched using the subcode signal read from the magnetic tape running at high speed. It has become.

That is, at the time of high-speed search, the reel motor is controlled so that the magnetic tape runs in the FF or REW direction at about 200 times the normal running speed of 8.15 mm / s. On the other hand, the above-mentioned drum motor is controlled at a constant speed of 2000 rpm during normal magnetic tape running, but during a high-speed search, the relative speed between the rotating head and the magnetic tape is kept constant according to the high-speed running of the magnetic tape. To do
1000-3000rp depending on the running speed and direction of the magnetic tape
It is controlled in the m speed range.

The signal processing circuit 13 processes four kinds of ATF signals recorded and reproduced on a magnetic tape in order to apply ATF servo to the capstan motor 15, that is, detection of each synchronization signal, and detection of each pilot signal. A signal is detected, and A is detected by the pilot signal from each adjacent track.
An ATF signal processing circuit that generates a TF error signal is provided.

The ATF error signal in the above-mentioned ATF servo is such that the previous value is held unless an ATF synchronizing signal is detected. By the way, at startup,
If the positional relationship between the magnetic tape and the rotating head is in the opposite phase where it is difficult to detect the ATF synchronization signal, it may take time to pull in the servo. In such a case, an error signal is intentionally given to speed up the pull-in, so that the servo pull-in can be speeded up.

As described above, each of the DATs 1a to 1d is:
When recording digital signals on the magnetic tape,
Drum motor (not shown) and capstan motor 15
A drum servo mechanism and a capstan servo mechanism are provided so as to independently apply servos to and
When reproducing a digital signal from a magnetic tape, servo is applied to the rotating drum, while ATF servo is applied to the capstan motor 15.

Therefore, when reproducing a digital signal, the ATF servo allows the rotary head to accurately trace the track on the tape with reference to the signal recorded on the tape, so that a more accurate digital signal can be reproduced. It is possible.

On the other hand, the connection control unit 24
a to 1d are master (master) or slave (slave)
/ Slave switching circuit 25 for switching to
And first and second system terminals 26 and 27 which are connection terminals between the DATs 1a to 1d. As shown in FIG. 6, the system terminals 26 and 27
Each of the three lines is connected to a DRUMSYNC signal line, an LR clock line, and a CMD / RET line.

The DRUMSYNC signal line is connected to the master DA
From T1a, each slave DAT1b, 1c, 1d
This is a line for transmitting the DRUMSYNC signal. The LR clock line is connected from the master DAT1a to each slave DAT1b.
A line for transmitting an LR clock signal to 1c and 1d.

The CMD / RET line is connected to the master DAT1
a command signal (hereinafter, referred to as a CMD signal) and a subcode signal for transmitting an operation command such as recording, reproduction, or pausing to each of the slave DATs 1b, 1c, and 1d. DAT1a
As shown in FIG. 1, a transmitting means 31 for outputting the operating state of the master DAT 1a and the subcode signal to the outside is provided. In FIGS. 1 and 6, some slave DATs are omitted.

On the other hand, the RET line is the master DAT1a
In addition, each slave DAT1b ・ 1c ・ 1d accompanying the CMD signal
A line for transmitting a preparatory operation information response signal (hereinafter referred to as a RET signal) to notify the operation status of
Therefore, each slave DAT1b ・ 1c ・ 1d has
A DET (Detecter) circuit (detection means) 28 is provided for detecting the operating states and outputting the detected state to the master DAT 1a.

The above CMD and RET lines are CMD / RET
The CMD / RET line is a bidirectional line that shares the same line as the line.
CMD line for CMD signal communication
It is set so that when the SYNC signal is Low, it becomes the RET line for RET signal communication.

The CMD signal has a data length of 8 bits, a stop bit length of 1 bit, no parity, and a bit rate of 1562.
5bit / sec asynchronous communication signal and 9 bytes of 0-8
Consists of As its contents, Byte 0 is COMMND
Bytes 1 to 4 are composed of the time (H), minute (M), second (S), and frame number (F) of the absolute time (hereinafter referred to as A-TIME) from the tape start point. Bytes 5 to 8 include, for example, “Mute request during PLAY” and “L
Other information including each signal such as "P / SP switching". LP is an abbreviation of Long Play, SP is Standard Pla
Abbreviation of y.

On the other hand, the RET signal is output from the slave DAT1b
DET circuit 28 for detecting the operation state in 1c and 1d
From each slave DAT 1b, 1c, 1d
Indicates that the instruction is being executed from the master DAT1a or is in a standby state after the execution of the instruction.

For example, when the DRUMSYNC signal of the master DAT1a is in the "H" period, the master DAT1a sends a common CMD command or a subcode signal such as A-TIME information to each of the slave DATs 1b, 1c, and 1d, and outputs "L". During the “period”, each slave DAT 1 b, 1 c, 1 d responds to the CMD command from the master DAT 1 a when receiving the CMD or during execution of the CMD, “Busy (L)”, and after completion of the execution, “Ready (H)”. I do.

Therefore, the DET circuit 28 of each of the slave DATs 1b, 1c and 1d is provided in the master DAT 1a.
A second control means 32 is provided for controlling the operation of the master DAT 1a, for example, the operation of canceling the standby state of recording, based on the signal from the controller DAT1a.

Master DAT1a and slave DAT1b
-The interface between 1c and 1d has an open collector type on the output side of the CMD / RET line for communication described above, and each line has a 10kΩ pull-up resistor as shown in FIG. VCC5V is applied through this.

As described above, each slave DAT 1b, 1c,
Since the response from 1d is of the open collector type, it is wired OR. Thereby, the master DAT1a and each slave DAT1b ・ 1c ・ 1
d is governed by the response speed of the slowest slave DAT2, and after the responses from the DET circuits 28 of all the slaves DAT1b, 1c, 1d are completed, the master DAT1a
Will proceed to the next operation.

Then, in the master DAT 1a, the DRUMSYNC signal generated by the system control 8 and L
Output means (not shown) is provided so that the R clock is output to each of the slave DATs 1b, 1c, and 1d. Each of the slave DATs 1b, 1c, and 1d outputs each of the slave DATs 1b, 1c, and 1d from the DRUMSYNC signal and the LR clock.
The clock signals for demodulation of 1c and 1d and the drum motors of each slave DAT 1b, 1c and 1d are transmitted to the master D
A PLL (Phase Locked Loop) circuit (fifth control means) 23 for generating a signal for rotating in synchronization with the rotating drum of the AT 1a is provided.

As shown in FIG. 7A, the PLL circuit 23 includes first and second phase comparators 17 and 18 respectively.
And a VOC (Voltage Controlled Oscillator) 1 having a crystal oscillator having an oscillation frequency of 24.576 MHz, for example.
9 and 1/512 to divide the signal from the VOC 19
Of the slave DATs 1b, 1c, and 1d shown in FIG. 1 by the respective members 19, 20, and 21 and the counter 22 in the system control circuit 8. Master DAT
A clock signal that matches the frequency and phase of the DRUMSYNC signal in 1a is generated.

Each slave DAT 1b, 1c, 1d
As shown in FIG. 1, the master DA
A subcode signal (A-TIME information) sent from T1a,
A comparison unit 34 is provided for comparing the sub-code signals (A-TIME information) reproduced in the slave DATs 1b, 1c, and 1d and detecting a difference therebetween.

Further, each slave DAT 1b, 1c, 1
In (d), a third control means 35 for controlling the capstan drive circuit 16 in a direction to make the difference zero based on a signal from the comparison means 34 is provided.

In addition, the master DAT 1a and the slave DATs 1b, 1c and 1d have a fourth control for controlling the capstan drive circuit 16 so as to rewind the magnetic tape from the set recording start position by a predetermined amount during recording. Means 36 are provided.

As described above, in each of the master DAT 1a and each of the slave DATs 1b, 1c, and 1d, at the time of recording, the drum motor (not shown) and the capstan motor 15 are used.
Are independently servo-controlled, while the capstan motor 15 is speed-controlled (ATF servo) so as to accurately trace the track on the basis of the ATF signal recorded on each magnetic tape during reproduction.

The ATF servo method and A-TIME which is a subcode recorded together with a main signal such as an audio signal.
By using the recording, the synchronous operation of the master DAT 1a and each of the slave DATs 1b, 1c, and 1d can be performed. That is, if the DRUMSYNC signal, which is the reference for the rotation of the rotating drum during recording and playback, and the inter-frame phase of the time code such as A-TIME recording are matched, the synchronization within the frame is automatically achieved by the ATF servo. .

At this time, the slave DATs 1b, 1c, 1
It is desirable that the drum rotation of d be made to coincide with the frequency and phase of the drum rotation of the master DAT 1a, and the PLL circuits 23 of the slave DATs 1b, 1c and 1d
As shown in FIG. 7A, the DRUMSYNC signal is prepared in two stages because the frequency difference from the original oscillation crystal oscillator (24.576 MHz) is large.

First, an original oscillation frequency whose phase is synchronized with the master DAT 1a is produced from the LR signal (48 kHz) of the master DAT 1a by the first PLL circuit 23a, and subsequently, the master DAT 1b is produced by the second PLL circuit 23b.
1a DRUMSYNC signal (33.3Hz) and first PLL circuit 2
The DRUMSYNC signal having the same phase as that of the master DAT1a is generated from the original oscillation frequency of the master DAT1a.

By the way, the master DAT 1a and the slave DATs 1b, 1c, and 1d shown in FIG. 1 are recorded and synchronized in time within a practical range even when the phases between the frames do not match. Reproduction becomes possible.

However, by making the phases between frames in each of the DATs 1a to 1d also coincide, it is possible to achieve more complete synchronization. From this, in order to match the phases between the respective frames, the master D
AT1a sends A- to each slave DAT1b, 1c, 1d.
Always transfer TIME information. On the other hand, each slave DAT1b
・ 1c ・ 1d is A- from master DAT1a at the time of recording.
Based on the TIME information, each of the slave DATs 1b, 1c, and 1d records its own A-TIME information such that the phases match with the master DAT 1a.

At the time of reproduction, the master DAT 1a
A difference between the A-TIME information and the A-TIME information reproduced by the slave DATs 1b, 1c, and 1d is detected by the comparing means 34. If a difference occurs, the third control means 35 responds to the time difference. The kick pulse is given as a disturbance to the capstan motor drive circuit 16 to advance or delay the frame on the magnetic tape, and the A-TI
Match with ME position. As shown in FIG. 7B,
As a kick pulse as a disturbance, CDRRIV (forced forward rotation pulse) or CAP-REV (forced reverse rotation pulse) is used.

Next, a description will be given of each operation when each main signal such as a multi-channel audio signal is recorded / reproduced on each magnetic tape of each of the DATs 1a to 1d as described above. First, using the master / slave switching circuit 25 shown in FIG. 2, as shown in FIGS. 1 and 3, one master DAT 1a and slave DATs 1b, 1c, and 1d are set in a system composed of each DAT. The terminals 26 and 27 of the DATs 1a to 1d are connected by the system cable 3.

In the master DAT 1a and the slave DATs 1b, 1c, and 1d, the same time code information (A-Time) as that of the master DAT 1a is recorded in the slave DATs 1b, 1c, and 1d when each main signal is recorded. The master DAT 1a and each of the slave DATs 1b, 1c and 1d can reproduce their time code information in synchronization with each other.

That is, each DAT1 connected in this way is
In a to 1d, when the operator operates the input operation key 14 of the master DAT 1a, a command command signal is transmitted through the CMD / RET line to the other slave DATs 1b, 1c, 1d.
, So that they can operate synchronously.

Next, the sequence of the synchronous recording operation of each of the DATs 1a to 1d will be described with reference to FIG. 1) Master DAT1a and each slave DAT1b
1c and 1d are equipped with DAT cassettes, and each DAT1a ~ 1
Set d to the synchronous recording mode. 2) A key is operated on the master DAT1a to adjust a tape position at which recording is started. 3) Press the record key of the master DAT1a (hereinafter, referred to as REC key). 4) The master DAT 1a first enters the REC-PAUSE state, and moves the magnetic tape a predetermined distance (16 to 25) from the start position.
mm) Rewinds in the direction of the start of the magnetic tape (in the figure), sets the approach start position (in the figure), waits (in the figure), and sends the A-TIME information of the current position and the REC-PAUSE command to each slave DAT1b.・ Transfer to 1c and 1d via the system cable 3.

5) Each slave DAT 1b, 1c, 1d stores A-TIME information and REC-PAUSE from master DAT 1a.
Following the A-TIME search (in the figure) on the magnetic tape using the high-speed search servo mechanism so that the tape position of each slave DAT1b, 1c, 1d matches the tape position of the master DAT1a according to the instruction, the magnetic tape runs. Set to the start position and enter REC-PAUSE state (in the figure).

6) The master DAT 1a is connected via the system cable 3 to all the slave DATs 1b-1d.
When it is confirmed that the tape is in the -PAUSE state, the tape is run toward the recording start position to start REC-PLAY.
The current A-TIME information and REC-PLAY command are output to 1d. The running time at the above-mentioned approach distance is about 2500 ms at a normal magnetic tape running speed.

7) The slave DATs 1b, 1c and 1d are:
In accordance with the A-TIME information / command from the master DAT1a, each magnetic tape position runs in synchronization with the magnetic tape position of the master DAT1a (in the figure, note 1), and the same as the master DAT1a during REC-PLAY. While recording the A-TIME information at the same magnetic tape position at the time, each channel of the audio signal
Multi-channel synchronous recording is performed with T1a and each slave DAT1b, 1c, 1d (in the figure and in the figure, '). In this way, a synchronous recording operation of each of the DATs 1a to 1d is possible.

Next, the sequence of the synchronous reproduction operation of each of the DATs 1a to 1d will be described with reference to FIG. 1) Master DAT1a and each slave DAT1b
1c and 1d, the DAT cassettes in which the synchronized A-TIME information is recorded as described above are mounted, and
T1a to 1d are set to the synchronous playback mode. 2) Key operation of the master DAT1a is performed to adjust the tape position at which reproduction is started. 3) Press the PLAY key of the master DAT1a (in the figure).

4) The master DAT 1a enters the PAUSE state, and transfers the A-TIME information of the current position and the A-TIME search command to each slave DAT 1b, 1c, 1d via the system cable 3. 5) Each slave DAT 1b, 1c, 1d
An A-TIME search is performed by moving each magnetic tape in accordance with the information and instructions from the AT 1a (in the figure), and the respective magnetic tape positions are matched with the magnetic tape positions of the master DAT 1a to be in a PAUSE state (in the figure).

6) The master DAT 1a is connected to all slave DATs 1b, 1c and 1d via the system cable 3.
When the PAUSE state is confirmed, the PLAY operation is started, and the current A-TIME information and the PLAY command are transferred to each of the slaves DAT1b, 1c, and 1d (in the figure).

7) The slave DATs 1b, 1c and 1d perform a PLAY operation while aligning each tape position with the position of the running magnetic tape of the master DAT 1a in accordance with the information and command from the master DAT 1a (Note 1). Play the same A-TIME position at the same time as. In this way, synchronized playback operations of the DATs 1a to 1d can be performed. Note that Note 1 above indicates that A-TIME alignment between the master DAT 1a and the slave DATs 1b to 1d is performed in track units.

That is, as a positioning method, a disturbance (kick pulse) is given to the speed control (ATF servo) circuit of the capstan motor to jump to the previous and next tracks. The width and polarity of such a disturbance are determined by the A-TIME information from the master DAT1a and the slave DAT1b.
The difference from the A-TIME information reproduced by 1c and 1d is calculated and set.

As described above, according to the configuration of the above embodiment, each main signal such as a multi-channel audio signal is
Master DAT1a and each slave DAT1b ・ 1c
・ When recording to each 1d, the above master DAT1a
Is output to each of the slave DATs 1b, 1c, and 1d through the CMD / RET line using the transmission means 31, so that the master DAT 1a is operated to operate the A-TIME information, which is a subcode signal from the transmission means 31. In each slave DAT 1 b, 1 c, 1 d.
And can be recorded together with each main signal.

In addition, the above-described structure is equivalent to the master DAT1a
When reproducing each main signal such as a multi-channel recorded in each slave DAT 1b, 1c, 1d, the operating state of the master DAT 1a and the A-TIME information are transmitted to each slave DAT 1b,
1c and 1d, the master DAT
1a, the reel servo (not shown) or the capstan motor 15 is controlled by the search servo mechanism of the slave DATs 1b to 1d, and the magnetics of the slave DATs 1b, 1c, and 1d are moved to the positions indicated by the A-TIME information. The tape can be moved individually.

Therefore, the above-described configuration allows the DET circuit 28 and the second control means 32 to reproduce the master DAT 1a and the slave DATs 1b, 1c and 1d from the respective magnetic tape positions where the same subcode signal is recorded. And the main signals recorded in the master DAT 1a and the slave DATs 1b, 1c and 1d can be synchronously reproduced.

Further, according to the above configuration, the comparing means 3
4 and the third control means 35, even if there is a difference in reproduction between the master DAT 1a and each of the slave DATs 1b, 1c and 1d due to elongation of the magnetic tape, etc. It can be adjusted as follows. Thereby, the above configuration is
Master DAT1a and each slave DAT1b ・ 1c
Synchronous reproduction in 1d can be completely matched, and stable synchronous reproduction of each main signal can be performed.

In addition, according to the above configuration, for example, when another second main signal is recorded on a magnetic tape on which a predetermined amount of the first main signal has been recorded, following the recording area, (4) The control unit 36 can start running the magnetic tapes of the master unit and the slave unit from the position where the master DAT 1a and the slave DATs 1b, 1c, and 1d are returned by a predetermined amount in the area where the main signal is recorded.

As a result, a pre-recorded subcode signal can be used.
1a and each slave DAT 1b, 1c, 1d can be synchronized so that each main signal can be successively recorded in a previously recorded magnetic tape area.

Therefore, the above-described configuration is equivalent to the master DAT
1a and each of the slave DATs 1b, 1c, and 1d can maintain the continuity of each subcode signal, so that the master DAT1a and each of the slave DAT1b.
Synchronous reproduction can be easily performed even in the magnetic tape connection recording areas 1c and 1d, and the recording areas of the respective magnetic tapes can be effectively used without waste.

Further, according to the above configuration, the DRUMSYNC signal and the LR clock signal as output means are output from the master DAT 1a to each of the slave DATs 1b, 1c, 1d, and the fifth control means (not shown) is used. , The rotations of the rotary heads of the master DAT 1 a and the slaves DAT 1 b, 1 c, 1 d can be synchronized.

From the above, it is possible to record each main signal together for each track when recording each main signal. Therefore, when reproducing each main signal recorded as described above, the capstan servo mechanism is used. The master DAT1 only controls the running of the magnetic tape
a and the main signals recorded on the respective tracks of the slave DATs 1b, 1c and 1d can be reproduced in synchronization.

Therefore, in the above-described configuration, the time required for matching the reproduced main signals by electrical processing, for example, storing the reproduced main signals and subcode signals in the RAM, and setting the frame number of the main signal or the subcode signal, There is no need to call and rearrange according to the block number, shortening the processing time for each main signal, and
The processing of each main signal can be simplified and the size can be reduced. Thus, in the configuration of the above embodiment, each of the DATs 1a to 1d
Can be recorded and reproduced with a simple configuration, and multi-channel recording and reproduction can be performed with a low-cost and small-sized configuration. As a result, the configuration of the above embodiment can expand the applicable range of the DAT, and can improve the utility value.

[0075]

As described above, the digital signal recording / reproducing apparatus according to the first aspect of the present invention is capable of recording or reproducing data on or from a single master unit selected from a plurality of digital signal recording / reproducing apparatuses used. Sometimes, there is provided a sending means for outputting a subcode signal and a status signal indicating the operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and the subcode signal is transmitted together with a main signal. First control means for controlling the slave unit for recording is provided, and detection means for detecting an operation state of the slave unit and outputting it to the master unit is provided, based on a signal from the detection unit. And a second control means for controlling the master unit.

Therefore, the above-described configuration has an effect that the parent device and the child device can be recorded / reproduced in synchronization with each other and can be made simple and small-scale, so that they can be inexpensively reduced in size.

As described above, the digital signal recording / reproducing apparatus according to the second aspect of the present invention can be used for recording or reproducing to one master unit selected from a plurality of used digital signal recording / reproducing apparatuses. Transmitting means for outputting a sub-code signal and a status signal indicating an operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and transmitting the sub-code signal to a main signal First control means for controlling the slave unit so as to record together with the information, and detection means for detecting an operation state of the slave unit and outputting the operation state to the master unit, and based on a signal from the detection means. Second control means for controlling the master unit, and comparing means for comparing the subcode signal from the master unit with the subcode signal reproduced in the slave unit during reproduction to detect a difference. Vignetting is configured such that the third control means for controlling the capstan servo mechanism to reduce the difference based on a signal from said comparison means.

Therefore, the above configuration can record and play back the master unit and the slave unit in synchronization with each other, and can achieve a simple and small-scale structure. Even when a difference in reproduction between the master unit and the slave unit occurs due to elongation of the magnetic tape or the like, the above difference can be adjusted and the difference can be avoided. This has the effect that it becomes possible.

As described above, the digital signal recording / reproducing apparatus according to the third aspect of the present invention provides a method for recording or reproducing data to or from a single master unit selected from a plurality of digital signal recording / reproducing apparatuses used. Transmitting means for outputting a sub-code signal and a status signal indicating an operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and transmitting the sub-code signal to a main signal First control means for controlling the slave unit so as to record together with the information, and detection means for detecting an operation state of the slave unit and outputting the operation state to the master unit, and based on a signal from the detection means. A second control means for controlling the master unit so that, during recording, the master unit and the slave unit start running of the magnetic tape from a position returned by a predetermined distance from a set position at which recording is started. Gosuru fourth control means is configured to are provided.

Therefore, the above-described configuration can record and play back the master unit and the slave unit in synchronization with each other, and can be made simple and small-scale. It is possible to synchronize the master unit and the slave unit and record each main signal continuously in the prerecorded magnetic tape area, so that the continuity of each subcode signal between the master unit and the slave unit is possible. Therefore, there is an effect that synchronous reproduction can be easily performed even in the connection recording area of each magnetic tape.

As described above, the digital signal recording / reproducing apparatus according to the fourth aspect of the present invention can be used for recording or reproducing data to or from one of the plurality of digital signal recording / reproducing apparatuses selected. Transmitting means for outputting a sub-code signal and a status signal indicating an operation state of the master unit to a slave unit as a digital signal recording / reproducing device other than the master unit, and transmitting the sub-code signal to a main signal First control means for controlling the slave unit so as to record together with the information, and detection means for detecting an operation state of the slave unit and outputting the operation state to the master unit, and based on a signal from the detection means. Second control means for controlling the master unit, and output means for outputting the rotation frequency and phase of the rotary head to the slave unit are provided in the master unit, and the slave unit receives a signal from the output means. Fifth control means for controlling the rotary head of said child machine based a configuration is provided.

Therefore, the above configuration can record and play back the master unit and the slave unit in synchronization with each other, and can achieve a simple and small-sized device. Since each main signal recorded on each track of the master unit and slave unit can be played back in synchronization, there is no need to match each reproduced main signal by electrical processing, simplifying the processing of each main signal. As a result, the processing time of each main signal can be shortened and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a main block diagram of a system when a digital signal recording / reproducing apparatus of the present invention is combined.

FIG. 2 is a block diagram showing a configuration of the digital signal recording / reproducing apparatus.

FIG. 3 is an explanatory diagram of a system in which a plurality of the digital signal recording / reproducing devices are connected.

FIG. 4 is a timing chart of a recording operation of the above system.

FIG. 5 is a timing chart of a reproduction operation of the above system.

FIG. 6 is a circuit diagram showing an interface of the above system.

FIG. 7 shows a PLL in the digital signal recording / reproducing apparatus.
3A and 3B are block diagrams illustrating a circuit and a capstan motor control, wherein FIG. 3A illustrates a PLL circuit and FIG. 3B illustrates a capstan motor control.

[Explanation of symbols]

 1a Master DAT (master) 1b Slave DAT (slave) 1d Slave DAT (slave) 28 Detecting means 31 Sending means 32 Second control means 33 First control means

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) G11B 27/28 G11B 27/00

Claims (4)

(57) [Claims] 1. A digital signal recording / reproducing apparatus for recording / reproducing a sub-code signal such as an absolute time and a main signal such as an audio signal on a magnetic tape and having a search servo mechanism. A subcode signal and a status signal indicating an operation state of the master unit are recorded and recorded in one master unit selected from the plurality of digital signal recording / reproducing devices during recording or playback. Sending means for outputting to the slave unit as a digital signal recording / reproducing apparatus other than the above, and first control means for controlling the slave unit so as to record the subcode signal together with the main signal is provided; Detecting means for detecting an operation state of the main unit and outputting the detected operation state to the main unit; and a second control unit for controlling the main unit based on a signal from the detecting unit is provided. A digital signal recording / reproducing apparatus characterized in that: 2. A digital signal recording / reproducing apparatus which records and reproduces a subcode signal such as an absolute time and a main signal such as an audio signal on a magnetic tape and has a search servo mechanism and a capstan servo mechanism. A plurality of signal recording / reproducing devices are used, and a sub-code signal and a status signal indicating an operation state of the parent device are provided to one master unit selected from the digital signal recording / reproducing devices during recording or playback. Is provided to a slave unit as a digital signal recording / reproducing device other than the master unit, and a first control unit for controlling the slave unit to record the subcode signal together with a main signal is provided. Detecting means for detecting an operation state of the slave unit and outputting the detected operating state to the master unit, and based on a signal from the detecting means, Second control means for controlling the master unit is provided, and comparison means for detecting a difference by comparing the subcode signal from the master unit with the subcode signal reproduced in the slave unit during reproduction is provided. And a third control means for controlling the capstan servo mechanism so as to reduce the difference based on a signal from the comparison means. 3. A digital signal recording / reproducing apparatus which records / reproduces a subcode signal such as an absolute time and a main signal such as an audio signal on a magnetic tape and has a search servo mechanism and a capstan servo mechanism. A plurality of signal recording / reproducing devices are used, and a sub-code signal and a status signal indicating an operation state of the parent device are provided to one master unit selected from the digital signal recording / reproducing devices during recording or playback. Is provided to a slave unit as a digital signal recording / reproducing device other than the master unit, and a first control unit for controlling the slave unit to record the subcode signal together with a main signal is provided. Detecting means for detecting an operation state of the slave unit and outputting the detected operating state to the master unit, and based on a signal from the detecting means, Second control means for controlling the master unit is provided, and controls the master unit and the slave unit to start running the magnetic tape from a position returned by a predetermined distance from a set position at which recording is started during recording. 4. A digital signal recording / reproducing apparatus characterized by comprising four control means. 4. A digital signal recording / reproducing apparatus which records / reproduces a subcode signal such as an absolute time and a main signal such as an audio signal on a magnetic tape and has a search servo mechanism and a capstan servo mechanism. A plurality of signal recording / reproducing devices are used, and a sub-code signal and a status signal indicating an operation state of the parent device are provided to one master unit selected from the digital signal recording / reproducing devices during recording or playback. Is provided to a slave unit as a digital signal recording / reproducing device other than the master unit, and a first control unit for controlling the slave unit to record the subcode signal together with a main signal is provided. Detecting means for detecting an operation state of the slave unit and outputting the detected operating state to the master unit, and based on a signal from the detecting means, Second control means for controlling the master unit is provided, output means for outputting the rotation frequency and phase of the rotary head to the slave unit is provided in the master unit, and the slave unit is provided with a signal based on a signal from the output means. And a fifth control means for controlling a rotary head of the slave unit.