JP2856975B2 - Digital recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an R-DAT (Ro
The present invention relates to a digital recording / reproducing apparatus capable of recording / reproducing with a digital signal such as a tary head digital audio tape recorder.

[0002]

2. Description of the Related Art Conventionally, generally, people called professional mixing engineers edit music or the like by a recording method such as a multi-microphone method. The multi-mic method is a method in which the sound of each instrument is separately recorded on a multi-track tape deck and then edited (mixed down) into multiple channels.

A device for synchronizing the rotation of the drum, such as multi-channel editing, is also applied to a measuring instrument. In such a case, a plurality of recording devices are used, or multi-input recording is performed. By using the device,
A plurality of measurement results are recorded simultaneously.

[0004]

However, in a recording / reproducing apparatus such as a tape deck used in the above-mentioned conventional multi-microphone system, a sufficient recording capacity cannot be obtained or the apparatus becomes large. It has a problem, and furthermore, there is a problem that when people called amateurs and semi-professionals perform music editing as a hobby, it becomes very expensive.

Further, when a recording device in which the rotation of a drum is synchronized is applied to a measuring device, if the measuring device is composed of a plurality of recording devices, more accurate synchronizing operation of each recording device is not caused. However, it is difficult to see accurate measurement results at the same time. On the other hand, when the measuring device is configured by a multi-input recording device, although it is possible to see accurate measurement results, the device becomes very expensive,
There is also a problem that the recording capacity and the number of inputs are limited.

[0006]

The digital recording / reproducing apparatus according to the first aspect of the present invention employs the following means to solve the above-mentioned problems.

In other words, a plurality of digital recording / reproducing apparatuses for performing at least one of recording and reproduction by a digital signal with respect to a recording medium are provided, one of which is used as a master unit and the other is used as a master unit. In the digital recording / reproducing apparatus to be a slave unit, the synchronization between the master unit and each slave unit is performed by making the drum rotation coincide with the DRMSY signal and using the absolute time from the tape start point at the time of recording. A-TI for matching phases between frames with each slave unit
This is achieved by matching the phases between frames by ME recording, and at the same time, synchronization within the frame is achieved by the ATF servo method, and the master unit and each slave unit are synchronized .
The connection control means is connected between the
The stage is associated with operations such as recording / reproduction on the recording medium of the master unit.
Each child by the command signal of the master unit including the position information of the recording medium.
While operating the machine, the operation status of each slave unit by command signal
Is notified to the master unit by the preparatory operation information return signal from each slave unit.
Command signal and preparation operation between the master unit and each slave unit.
For transmission and reception of the operation information return signal, one line
Switching based on High / Low of MSY signal
And done by

[0008]

According to the first aspect of the present invention, when the master unit performs an operation such as recording / reproducing on the recording medium, the master unit records data in each slave unit via the connection control means. A command signal including the location information of the medium is transmitted. Thereby, each child device that has received the command signal performs an operation such as recording and reproduction according to the operation of the parent device.

At this time, each slave unit is synchronized with the master unit using the DRMSY signal, A-TIME recording, and the ATF servo method.

When a command signal is transmitted from the master unit to each slave unit, a preparatory operation information return signal is transmitted from the slave unit to the master unit via the connection control means, and the command signal is transmitted to the slave unit. In response, whether or not each child device is operating is notified to the parent device. As a result, the operation of each slave unit according to the command signal from the master unit is reliably performed.

Furthermore, by DRMSY signal to each slave unit via the connection control unit from the master unit is transmitted, the synchronization transmitting and receiving instruction signals and preparation operation information return signal between the master unit and the slave unit Is taken. Thereby, it becomes possible to operate each slave unit synchronously according to the operation of the master unit.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a DAT (Digital Audio Tape Recorder) as a digital recording / reproducing apparatus according to the present embodiment includes a total of nine devices having the same configuration and the same function. Is the master DAT (master unit)
As a, the remaining 8 units are slave DATs (child units)
b to i are set.

As shown in FIG. 2, each of the above-mentioned DATAs is composed of a main unit 1 for performing recording and reproduction operations on a DAT cassette tape as a recording medium by digital signals, and a connection in connection between respective devices. And a connection control unit 24 serving as control means.

The main body 1 includes a mechanical section 2 having various components such as a drum and a capstan on which a rotary head is mounted, amplifiers 3 and 4 for recording and reproduction, a servo control (circuit) 5, A modulation / demodulation (circuit) 6 for converting data into bits, a system microcomputer 7 serving as central control means, a system control (circuit) 8 for generating a DRMSY signal described later, and connected between the system microcomputer 7 and the system control circuit 8 Sub-code (circuit)
Two RAMs 1 each having a storage capacity of 9, 64 kbits
0, A / D (converter) 1 with input terminal for recording signal
1. D / A (converter) 1 having an output terminal for a reproduced signal
2. A / D and D / A converters 11 and 12 are connected, signal processing (circuit) 13 having input / output terminals for digital signals, key operation of the device, and various displays. And a key / display unit 14 for performing the following operations.

As shown in FIG. 3, the mechanical section 2 includes a capstan motor 15 which is a drive source for the capstan. The servo control circuit 5 includes a capstan drive circuit 16 for driving the capstan motor 15. It has. In addition, the signal processing circuit 13 transmits an ATF (Automatic Track Following) to the capstan, which will be described later.
An ATF signal processing circuit for processing an ATF signal is provided for applying a servo. First and second phase comparators 17 and 18 as shown in FIG.
(Voltage Controll)
ed Oscillator) 19 and 1/512 counter (circuit)
20 and an AND circuit 21. Then, a clock signal for demodulation is created from the reproduced signal so that each bit of the reproduced signal is accurately read by the constituent members 17 to 21 constituting the signal processing circuit 13 and the counter 22 in the system control circuit 8. PLL (Phase
(LockedLoop) circuit 23 is formed.

In this embodiment, DATa to i are respectively
When recording a digital signal on an AT cassette tape, a constant speed servo is applied to the drum and the capstan of the mechanical unit 2 independently. While applying a constant speed servo to the
F servo is applied. Therefore, at the time of 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 more accurate digital signal reproduction becomes possible. ing.

On the other hand, the connection control unit 24 includes a master / slave switching circuit 25 for switching the device between a master and a slave, and first and second system terminals 26 and 27 which are connection terminals between the devices. It is composed of

The system terminals 26 and 27 are connected to D
RMSY line, LR clock line, and COM /
It is composed of three RET lines. DR
The MSY line is transmitted from the master DATA to each slave DA.
A line for transmitting a drum synchronization signal (hereinafter, referred to as a DRMSY signal) to Tb to i is formed. The LR clock line is connected from the master DATA to each slave DATA.
Lines for transmitting LR clock signals to b to i are formed.

As shown in FIG. 4, the COM / RET line is connected from the master DATA to each slave DATb-i.
C for transmitting a command signal (hereinafter, referred to as a COM signal) for performing an operation command such as recording, reproduction, or pausing
In addition to forming an OM line, a RET line for transmitting a preparatory operation information return signal (hereinafter, referred to as a RET signal) from each slave DATb to i to the master DATa to notify the master DATa of an operation status accompanying the COM signal. I have. By the way, the above COM and RET lines are
The same line is shared as the RET line, and this COM / RET line forms a COM line for COM signal communication when the DRMSY signal is High, while
When the DRMSY signal is low, the R for the RET signal communication
ET line.

The above DRMSY line and COM
The / RET line communicates each signal in the communication format shown in FIG.

Also, C communicated on the COM line
The OM signal has a data length of 8 bits and a stop bit length of 1 b
it, no parity, bit rate 15625 bits /
In addition to the asynchronous communication signal of 9 sec, it is composed of 9 bytes of 0 to 8 as shown in FIG. Byte 0 is composed of COMMAD (instruction),
Each of ye1 to ye4 includes a time (H), a minute (M), a second (S), and a frame (F) of an absolute time (hereinafter, referred to as A-TIME) from a tape start point at the time of recording.
For example, “y5 to 8” is “Mute request at PLAY”
And other information including signals such as "LP / SP switching". Note that the COMMAD contents of Byte 0 are as follows:
This is shown below as Table 1.

[0023]

[Table 1]

This DAT is composed of one master DATa in which the master / slave switching circuit 25 is switched to the master, and eight slave DATs in which the master / slave switching circuit 25 is switched to the slave.
I and the master DATA and the slaves DATb to i are sequentially arranged in the first or second line for each line of DRMSY, LR clock, and COM / RET.
They are connected via system terminals 26 and 27. Thus, the present DAT constitutes an operation control mechanism (hereinafter, referred to as a chase lock mechanism) that synchronously operates the slave DATs b to i in accordance with operations such as recording and reproduction of the master DATA.

Hereinafter, the chase lock mechanism will be described.

This chase lock mechanism is based on the ATF
By using the servo system and the A-TIME recording,
It is relatively easy to configure. That is, the aforementioned DRMSY signal, which is a reference for drum rotation during recording and reproduction,
If the inter-frame phase of the time code is matched, the synchronization within the frame is automatically applied by the ATF servo.

The matching of the DRMSY signals is performed by matching the frequency and phase of the drum rotation with the above-mentioned PLL circuit 23. Incidentally, the coincidence of the frequency and the phase of the drum rotation by the PLL circuit 23 is as follows.
As shown in FIG. 3, the master DRMSY signal (33.3
Hz) and the original oscillation crystal of VCO19 (24.576M
Hz) is performed in two stages because the frequency difference is large.

First, an original oscillation frequency synchronized with the master is generated from the master LR clock signal (48 kHz) by the second phase comparator 18, and then the first phase is calculated from the original oscillation frequency and the master DRMSY signal. DRMSY whose phase matches that of the master by the comparator 17
A signal is created. As a result, the master and the slave do not have the same phase between the frames, but can record and reproduce in synchronization with time.

On the other hand, regarding the coincidence of the phases between frames,
A in the above-mentioned COM signal from the master to the slave
-This is performed by constantly transferring the TIME information. That is, the slave receives the A-
Based on the TIME information, the slave's own A-TIME is recorded so that the phase coincides with that of the master. At the time of reproduction, the frame shift is determined from the difference between the A-TIME information from the master and the slave's own A-TIME. To detect. Then, when a shift is detected in the frame, as shown in FIG. 3, a forced driving pulse voltage corresponding to the time difference is applied to the capstan motor drive circuit 16 as a disturbance to control the driving of the capstan motor 15. Then, the master and the A-TIME are matched by moving the frame forward or backward.

In the above configuration, each operation of recording and reproduction by the chase lock mechanism of the master DATA and the slaves DATb to i constituting the present DAT will be described below.

First, the recording operation of the master and the slave will be described.

A DAT cassette tape is mounted on each device.

The master is operated to match the tape position where recording is to be started.

Press the REC key of the master.

The master enters the REC / PAUSE state, and the A-TIME information of the current position and the REC / PAUS
The command of E is transferred to the slave via the system cable.

The slave enters the REC / PAUSE state by adjusting the tape position of the slave itself to the tape position of the master according to the information and command received from the master (A-TIME search).

The master recognizes that all the slaves have gone into REC / PAUSE via the system cable, starts a REC / PLAY operation, and gives the slaves current A-TIME information and REC / PLA information.
Outputs a Y instruction.

The slave runs in accordance with the information and instructions from the master received by the slave while adjusting the tape position of the slave itself to the tape position of the master, and the REC / P
It becomes the LAY state. At the time of REC / PLAY, the same A-TIME is recorded at the same time as the master.

Next, the reproduction operation of the master and the slave will be described.

A DAT cassette tape is mounted on each device.

The master is operated to match the tape position where reproduction is desired to start.

Press the PLAY key of the master.

The master enters the PAUSE state, and transfers the A-TIME information of the current position and the PAUSE command to the slave via the system cable.

The slave sets the tape position of the slave itself to the tape position of the master according to the information and command received from the master and enters the PAUSE state (A-TIME search).

The master recognizes that all slaves are in PAUSE via the system cable,
Start the LAY operation and send the current A to the slave.
-Output TIME information and PLAY instruction.

The slave performs the PLAY operation while adjusting the tape position of the slave itself to the tape position of the master according to the information and command received from the master, and reproduces the same A-TIME at the same time as the master.

Next, each reproducing operation process by the master and slave chase lock mechanisms will be described below.

When the PLAY key is input, the master first sets the PAU as shown in the flowchart of FIG.
The state becomes the SE state (S1). Then, P
Output the AUSE command and the current tape position (S
2) It is determined whether a READY signal is input from a slave (S3).

At S3, if there is no input of the READY signal, the process returns to S2. On the other hand, if there is an input of the READY signal, the PLAY state is set after muting (S4) (S5). Then, the current tape position and the PLAY command are output to the slave (S6), and it is determined whether a READY signal has been input from the slave (S6).
7).

In S7, if there is no input of the READY signal, the process returns to S4 again. On the other hand, if there is an input of the READY signal, the mute is released (S8), and it is determined whether or not the input of the READY signal from the slave. Is performed (S9).

At S9, if there is no input of the READY signal, the process returns to S4. If there is an input of the READY signal, it is determined whether or not the STOP key has been input (S9).
10). In S10, if the STOP key has not been input, the process returns to S9. On the other hand, if the STOP key has been input, a STOP command is output to the slave (S11). finish.

On the other hand, the slave receives the PAU from the master.
When the SE command is input, first, a BUSY signal is output (S21) as shown in the flowchart of FIG.
The tape position is searched (S22). When the search for the tape position is completed (S23), a PAUSE state is set (S24), and a READY signal is output to the master (S23).
25).

Thereafter, when a PLAY command is input from the master (S26), a BUSY signal is output (S27), and after the mute (S28), the PLAY state is set (S29). Then, the tracks are adjusted so that the same position as the tape position input from the master is reproduced (S30), and it is determined whether or not the tracks match (S30).
31). If the track does not match in S31,
While returning to S27 again, if the track matches,
The ADY signal is output to the master (S32), the mute is released (S33), and then the STOP signal from the master is output.
It is determined whether a command has been input (S34).

In S34, if the STOP command has been input, the reproducing operation process as described above is terminated. On the other hand, if the STOP command has not been input, it is determined whether or not the track has been matched (S35). . And S35
If the track does not match, the process returns to S27 again, while if the track matches, the process returns to S34 to determine again whether or not a STOP command has been input.

As described above, in the DAT of the present embodiment, the master DATA and each of the slaves DATb to i are DRMS.
Y and LR clocks and a COM / RET line are connected via a connection control unit 24 to form a chase lock mechanism. The chase lock mechanism operates according to operations such as recording and reproduction of the master DATA. The multi-channel digital recording / reproduction by DAT is realized by enabling the synchronous operation of each slave DATb-i.

The above embodiment does not limit the present invention, and various modifications can be made within the scope of the present invention.
For example, in the above embodiment, eight slave DATs b to i are operated synchronously with respect to one master DATA, but the number of such slave DATs set is not particularly limited.

[0057]

As described above, the digital recording / reproducing apparatus according to the first aspect of the present invention is a digital recording / reproducing apparatus that performs at least one of recording and reproducing operations on a recording medium by digital signals. A digital recording / reproducing apparatus comprising a plurality of units, one of which is a master unit, and the remaining units are slave units. A-TIME recording is used to match the phase between frames between the master unit and each slave unit using the absolute time from the tape start point at the time of recording. At the same time, synchronization within the frame is obtained by the ATF servo method, and
Connection control means is connected between the slave unit and the slave unit.
The connection control means operates the recording / reproducing operation on the recording medium of the master unit.
With the operation, the master unit's command signal including the position information of the recording medium
And operate each slave unit by command signal.
Operation status is sent to the master unit by the preparation operation information return signal from each slave unit.
To notify the command signal between the master unit and each slave unit
For sending and receiving the operation information return signal, one line
Switching based on High / Low of DRMSY signal
This is a configuration performed by

As a result, each slave unit can be automatically operated in accordance with the operation of the master unit, so that a convenient digital recording / reproducing apparatus can be realized.

Further, each slave unit can be reliably operated in response to a command signal from the master unit, and each slave unit can be synchronously operated in accordance with the operation of the master unit. It is possible to realize multi-channel digital recording / reproducing that enables wide-ranging recording / reproducing. Further, since such a multi-channel digital recording / reproducing apparatus can be configured by using, for example, a commercially available portable DAT, it is necessary to configure the apparatus at a lower cost and smaller size than a conventional recording / reproducing apparatus. This has the effect that it can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a master DAT and a slave DAT in one embodiment of the present invention.

FIG. 2 is a block diagram showing a main unit and a connection control unit constituting each of the above DATs.

FIG. 3 is a block diagram showing a PLL circuit, a capstan motor drive circuit, and a capstan motor of the main body.

FIG. 4 shows C of the master DAT and the slave DAT.
FIG. 3 is an explanatory diagram illustrating an outline of an OM / RET line.

FIG. 5 is an explanatory diagram showing communication formats of a DRMSY line and a COM / RET line.

FIG. 6 is an explanatory diagram showing the contents of each byte of a COM signal.

FIG. 7 is a flowchart showing a reproducing operation process by the chase lock mechanism of the master DAT.

FIG. 8 is a flowchart showing a reproducing operation process by the chase lock mechanism of the slave DAT.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body part 24 Connection control part (connection control means) 25 Master / slave switching circuit 26/27 System terminal a Master DAT (master) b-i Slave DAT (slave)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-217557 (JP, A) JP-A-3-120684 (JP, A) JP-A-2-149967 (JP, A) JP-A-63-217 239641 (JP, A) JP-A-1-287889 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 27/032 G11B 15/02

Claims (1)

(57) [Claims] A plurality of digital recording / reproducing apparatuses for performing at least one of recording and reproduction of digital signals on and from a recording medium; A digital recording / reproducing apparatus to be a slave unit, wherein the synchronization between the master unit and each slave unit is performed by making the drum rotation coincide with the DRMSY signal and using the absolute time from the tape start point at the time of recording. the a-tIME recorded to match the phase between frames between each slave with taken by matching the phases between the frames, at the same time, the synchronization in the frame is taken by the ATF servo method, and the base unit Connection control means is connected between each slave unit.
The connection control means is configured to record information on the recording medium of the master unit.
Master unit that includes location information of the recording medium during recording and playback operations
Each slave unit is operated by the command signal of
Preparing operation information return signal from each slave unit
Signal to the master unit, and a command signal and preparation operation information between the master unit and each slave unit.
The transmission and reception of the report return signal is performed by connecting one line to the DRMS of the master unit.
Switching based on High / Low of Y signal
A digital recording / reproducing apparatus characterized by being performed .