JPH0266789A - Recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus such as a rotary head type digital tape recorder used for electronic editing.

2. Description of the Related Art An example of the configuration of an editing system using a conventional rotary head type digital recording/reproducing device is shown in FIG.

FIG. 4 shows the case of a rotary head type digital audio tape recorder (hereinafter abbreviated as DAT) 21, 22 and an audio editing device using the same. In the DAT21 in Fig. 4, 1 is an A/D converter, 4 is a signal processing device, and when recording
Parity for error correction is added to the digital signal after /D conversion, and after passing through a modulator, a tracking signal is added, and the signal is supplied to the head of the cylinder 6 via the recording amplifier 5. On the other hand, during playback, the playback amplifier 7 from the recording head
The amplified and waveform-shaped reproduced signal is demodulated by the signal processing device 4, subjected to error correction, and then supplied to the D/A converter 9. The servo circuit 10 controls the speed and phase of the cylinder 6 and the capstan motor 36, and also controls the speed of the reel motor 37. 15 is a microcomputer for system control. Further, the system control microcomputer 15 is provided with a time code input/output function by connecting an external time code input circuit 11 and a time code output circuit 12. Also, the signal output 34 from the DAT 21 is applied to the audio signal input terminal of the DAT 22, and the time code output 33 from the bipedal DAT 22 is applied to the time code input terminal of the DAT 21. 16 is a time code comparison circuit that compares the input time code 33 and the DAT2L playback AMP.
7 to the reproduction time code 50 that has passed through the signal processing device 4. Further, a controller 35 is connected to the DAT2L 22, and editing operations are realized by issuing instructions from this controller. Note that the configuration of the DAT 22 is the same as that of the DAT 21, so a description thereof will be omitted.

In FIG. 4, the editing operation is roughly as follows. In advance, an editing tape on which a time code is recorded as time information together with PCM audio is placed on the recording side DAT 22, and an editing tape is placed on the playing side DAT 21, and respective editing points are designated from the controller 35. FIG. 5 shows the editing operation. After the start point 23 of the editing operation, tape positions are set at positions separated by a predetermined time from the editing in points 29 and 31 of each of the reproduction side and recording side number tapes (pre-roll 25).

Then, the system control microcomputer 15 checks the relative positional relationship based on the comparison information from the time code comparison circuit 16 up to the editing point, and gives multi-step speed commands to the servo circuit 10, so that the tape Fine-tune the speed and perform alignment (Harmony 26). Editing 27 is performed between the editing in point 29°31 and the editing out point 30.32. After passing the edit out point 28, it is run for a while (post roll 28).

The harmonization process 26 that determines editing accuracy in this process will be explained using FIG. 4. . The recording side DAT22 is
The time code 33 which is in the reproduction state in the phase adjustment 26 and is reproduced is given to the reproduction side DAT 21. On the other hand, the playback side DA
T21 is the input time code 33 and the playback side DAT2
The time code comparison circuit 16 compares the playback time code of i itself.
The comparison information is sent to the system control microcomputer 15. The system control microcomputer 15 finely adjusts the tape speed by issuing multi-step speed commands to the capstan motor 36, reel motor 37, and cylinder motor 6 through the servo circuit 10 based on the above comparison information, and finely adjusts the tape speed. Controls the relative position of the tape.

In addition, in the above fine adjustment, when the relative position is too small, the tape speed of the playback side DAT 21 is set faster, and as the relative position difference becomes smaller, the tape speed of the playback side DAT 21 is slowed to approach the tape speed of the recording side DAT 22. Set it as follows. That is, the recording side DAT22,
The DAT 21 on the playback side is controlled so as to reach each edit in point 29 and 31 at the same time.

In this conventional example, a case has been described in which the reproducing side DAT 21 adjusts the phase, but the recording side DAT 22 may also adjust the phase and in this case, the control is equivalent to the above control.

Problems to be Solved by the Invention However, in the above conventional example, the relative positioning of the tape by phase adjustment is performed by controlling the tape speed of the reproduction side DAT. A servo mechanism is required to finely adjust the tape speed in multiple stages.

2) Also, near the phase adjustment position, the tape speed of the reproducing side DAT approaches the tape speed of the recording side DAT, and the tracking speed becomes extremely slow.

3) There was a drawback that it was difficult to realize highly accurate editing such as editing in units of PCM samples (for example, 20.8 μs when the sampling frequency was 48 KHz).

In view of the above-mentioned problems, it is an object of the present invention to shorten the harmonization time and easily realize harmonization in units of samples without finely adjusting the tape speed of the reproduction side DAT in multiple stages.

Means for Solving the Problems In order to achieve the above object, the recording and reproducing apparatus of the present invention includes a time information input means, and a comparison between the input time information and the reproduction time information obtained by reproducing the tape of the apparatus. a comparison means for obtaining time difference information between the two; a tape speed control means for varying the tape running speed of the apparatus; a signal delay means for delaying the reproduced PCM signal obtained by reproducing the tape of the apparatus; The control means is provided for setting a delay amount for delaying the two-leg reproduction PCM signal by a predetermined period of time for the signal delay means based on the time difference information.

Further, in the recording and reproducing apparatus, a time information delaying means for delaying the reproduction time information obtained by reproducing the tape of the recording and reproducing apparatus, a time information output means for outputting the reproduction time information after the delay, and a time information output means for outputting the reproduction time information after the delay, and the input The device is equipped with a control means for setting a delay amount for delaying the bipedal playback time information by a predetermined period of time based on the time difference information between the time information and the playback time information obtained by playing the tape of the device. be.

Operation The present invention has the above-mentioned configuration to adjust the harmonic side DAT during phase adjustment.
Compares the above input time information with the playback time information obtained by playing the tape on the device, obtains the time difference information between the two, varies the tape running speed, and sets several speeds to shorten the time. Approximate values are adjusted so that the relative position on the harmonic side is slightly advanced from the relative position on the reference side, and then, based on the time difference information obtained from the comparison means, a delay amount is determined to delay the reproduced PCM signal by the error in the relative position. By setting the above signal delay means, the above error can be instantly corrected, and by making the set delay unit of the signal delay means small, the delay time can be set finely.
It is possible to harmonize CM signals with high precision.

Furthermore, by setting a delay amount for delaying the playback time information by a predetermined period of time for the time delay means based on the time difference information obtained from the comparison means, the error can be instantly corrected, and the setting delay of the time delay means can also be delayed. By making the quantity unit small, the delay time can be set finely, and the time information output from the device can be harmonized with high precision.

Embodiment An embodiment of the present invention is shown in FIGS. 1 and 2. In addition, the first
In the drawings and FIG. 2, the same parts as in FIG. 4 are given the same symbols and perform the same operations, so the explanation will be omitted. In FIG. 1, 19.20 is the DA of this embodiment.
19 is a reproduction side DAT, and 20 is a recording side DAT. Further, 2 and 8 are signal delay memories each having 4 megabits. If the sampling frequency is 48 kHz and the number of quantization bits is 16 bits, 5.46 seconds of PCM data can be stored. 3 is a memory control means. The general operation during editing is the same as that of the conventional example described above.

FIG. 2 is an operational diagram illustrating phase adjustment processing during editing by DAT using the configuration of the present invention. In FIG. 2, the relative position of the playback DAT from the edit-in point is delayed by the relative position from the edit-in point of the recording-side DAT in the pre-roll 24, and the tape speed of the playback-side DAT is changed to the recording-side DAT in the phase adjustment 26. overtake by making it faster than the tape speed.

The error (X in FIG. 2) generated at this time is corrected by the signal delay memory 8.

Returning to FIG. 1, the write address and read address of the signal delay memories 2 and 8 are determined by the memory control means 3.
controlled by If this address bus is 18 bits, the memory control means 3 can control the signal delay memories 2 and 8 in units of one sample (16 bits). In addition, by setting the read address to be temporally delayed from the write address, that is, by providing an offset, the signal output from the signal processing device 4 described in 1. Supplied to A converter 9.

In this embodiment as well, the reproduction side DAT 19 adjusts the phase. During harmonization, the playback side DAT 19 is the time code input circuit 11
Compare the input time information obtained through the device with the playback time information obtained through the playback amplifier 7 and signal processing 4 by playing back the tape in the device, obtain the time difference information between the two, vary the tape running speed, and perform several steps. Set the speed and match the approximate values so that the relative position on the harmonic side slightly advances from the relative position on the reference side in a short time. As a result, it is assumed that the relative position error becomes 1/3 frame (10 msec). ]
- Determine a delay amount to delay the reproduced PCM signal by the relative position error based on the time difference information obtained from the comparison means, and set the delay amount from the system control microcomputer 15 to the memory control means 3. The offset address of the signal delay memory 8 given by the memory control means 3 is as follows. Sampling frequency is 48kHz
Therefore, the number of PCM samples in 10m5ec is 480
become. Therefore, the offset address is 480. This address processing can normally be performed in a time of several m5ec or less. Furthermore, the error is smaller and 1 sample (2
Even in the case of 0.8 micro 5ec), by reducing the set delay amount unit of the signal delay means, that is, by setting the offset address to 1, the delay time can be set finely, and harmonization can be performed with high precision. It is something.

Note that the signal delay can be performed by the signal delay memory 2 instead of the signal delay memory 8, so that only one of the signal delay memories 2 and 8 may be used as the signal delay memory.

A second embodiment of the invention is shown in FIG. Note that for components having the same configuration and the same operation as those of the conventional example and the first embodiment, the same symbols will be replaced and the explanation will be omitted.

In FIG. 3, 17.18 is the DA according to the configuration of the present invention.
T, 17 is the playback side DAT, 18 is the recording side DAT113
1 is a memory control means, and 14 is a time code delay memory. In FIG. 3, it is assumed that the relative position on the post-harmonization phase side is 1/3 frame ahead of the relative position on the reference side. Similarly to the PCM signal, a delay amount is determined to delay the reproduction time code by the relative position error based on the time difference information obtained from the comparison means, and the system control circuit 15 sets the delay amount to the memory control means 14. do. The memory control means 14 can finely set the address of the time code delay memory 13 in the same way as in the first embodiment, so it is possible to adjust the phase of the output time code with high precision. can.

Effects of the Invention As described above, the present invention records and reproduces diagonal tracks on a tape by rotating a cylinder equipped with a plurality of rotary heads, and records at least time information along with a PCM signal on each track. In a digital recording and reproducing apparatus for reproducing, a time information input means, a comparison means for comparing the input time information and reproduction time information obtained by reproducing the tape of the apparatus to obtain time difference information between the two, and a tape of the apparatus. tape speed control means for varying the running speed; signal delay means for delaying the reproduced PCM signal obtained by reproducing the tape of the device; and a delay amount for delaying the reproduced PCM signal by a predetermined time based on time difference information obtained from the comparison means. By providing a control means for setting the signal delay means for the signal delay means, it is possible to finely set the delay amount of the signal delay means when aligning the edit point of the reference side tape and the edit point of the harmonic side tape in electronic editing. Since it is possible to match editing points more precisely than on a frame-by-frame basis, a high-precision electronic editing machine can be realized.

Further, in the recording and reproducing apparatus, a time information delaying means for delaying the reproduction time information obtained by reproducing the tape of the recording and reproducing apparatus, and a time information output means for outputting the reproduction time information after the delay, "1 By comprising a control means for setting a delay amount for the time delay means to delay the reproduction time information by a predetermined period of time based on time difference information between the input time information and the reproduction time information obtained by reproducing the tape of the apparatus, After harmonization during electronic editing, harmonization side DAT
Since it is possible to match the playback sound and output time code with higher precision than in frame units, the time code output can be used as a time code accurately synchronized with the playback sound from the reference side (recording side) DAT or the third Can be supplied to equipment.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic editing system according to a first embodiment of the present invention, FIG. 2 is an operation diagram illustrating harmonization processing during editing according to this embodiment, and FIG. 3 is a block diagram of an electronic editing system according to a second embodiment of the present invention. FIG. 4 is a block diagram of the electronic editing system in the example, FIG. 4 is a block diagram of the conventional electronic editing system, and FIG. 5 is an operation diagram explaining the editing operation of the conventional example. 20 signal delay memory, 3 memory control means,
411・Signal processing device, 8・・Signal delay memo 1c 10I・Servo circuit, 11・・Time code input circuit, 12・・Time code output circuit, 13
...Time code delay memory, 14...Memory control means, 1511.System control microcomputer, 1f3--Time code comparison circuit.

Claims (2)

[Claims] (1) A digital recording and reproducing device that records and reproduces diagonal tracks on a tape by rotating a cylinder equipped with a plurality of rotary heads, and records and reproduces at least time information along with a PCM signal on each track,
time information input means; comparison means for comparing the input time information and playback time information obtained by playing back the tape of the apparatus to obtain time difference information; and tape speed control for varying the tape running speed of the apparatus. a signal delaying means for delaying a reproduced PCM signal obtained by reproducing a tape of the device; and a signal delaying means for delaying the reproduced PCM signal by a predetermined time based on the time difference information obtained from the comparing means. A recording/reproducing device characterized by comprising a control means for setting. (2) In the recording and reproducing apparatus, a time information delaying means for delaying the reproduction time information obtained by reproducing the tape of the recording and reproducing apparatus, a time information output means for outputting the reproduction time information after the delay; It is characterized by comprising a control means for setting a delay amount for delaying the reproduction time information by a predetermined time to the time information delay means based on time difference information between the input time information and the reproduction time information obtained by reproducing the tape of the apparatus. A recording/playback device for