JPH04158685A - Recorder - Google Patents

Abstract

PURPOSE:To record a signal at a consecutive signal recording position not requiring much processing time by using a preceding head so as to record a signal taking much processing time to a deviated position corresponding to the processing time. CONSTITUTION:A recording system consists of a video signal recording processing circuit comprising a video signal encoder 1, an FM modulator 2, a laser driver 3, of an audio signal recording processing circuit comprising an audio signal encoder 5, an FM modulator 6 and a laser driver 7, of a timing controller 4 and of a multi-beam laser 8. Then an audio signal taking much signal processing time is recorded by using a head active in timewise precedence over plural other heads to a position equivalent to a signal processing resident time such as a position corresponding to one frame while the position of a recording medium is deviated by, e.g. one track. Thus, signals whose recording processing times are different are recorded to consecutive positions of a recording medium and succeeding various signal processings such as reproduction processing are smoothly implemented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording/reproducing device such as a video disk system or a magnetic tape device. The present invention relates to a device for recording a plurality of signals having different signal processing times while maintaining a predetermined temporal and positional relationship.

(Prior art) In the video disc system G, video (image) signals and audio (sound) are transmitted in units of fields or frames.
FIG. 1 is a circuit configuration diagram of a conventional video disc system that records signals on a disc and plays them back.

Signal processing timing diagrams and diagrams explaining the operation thereof are shown in FIGS. 7 to 10, respectively.

This video disc system is a single beam type video disc system that transmits video and audio signals to a recording medium by using one laser in a time-division manner.

In the recording system RFC, 1 analog format input video signal S V + and input audio signal 5 AIN are each A
The signal is applied to D converters 41 and 47 and converted into a digital signal. The video signal from the AD converter 41 is stored in a FIFO/2 frame memory 424 which has a memory capacity of two frames and performs first-in first-out (FIFO) processing for time axis compression. The video signal stored in the memory 42L is time-base compressed by a time-base compression control circuit 43. On the other hand, the audio signal from the AD converter 47 is pulse coat modulated (pcM
) PCM modulated by the processor 48ζ and stored in the RAM 51 via the RAM controller 50. F
The time axis compressed video signal from the XFO/2 frame memory 42 and the PCM modulated audio signal stored in the RAM 51 are synchronized to the synchronization signal generation/audio signal mixer circuit 45.
and mixed with the synchronization signal. DA converter 4
4 performs a multiplex song on the mixed audio signal and video signal using sample clock 7, and outputs it to the FM modulator 46 as an analog signal. The FM modulator 46 performs FM modulation on the multiplexed audio and video signals. A laser (not shown) mounted on the head transmits FM modulated video and audio signals to the disk 55.
recorded on a predetermined track.

The recycled yarn PB performs a processing operation opposite to the above recording.

Audio and video signals recorded on the disc 554 are detected by a light receiving element (not shown), and these detected signals are demodulated by an FM demodulator 61 and AD converted by an AD converter 62. AD conversion output is FIFO memory υ6
5, the time axis expansion process is performed under the control of the TBC control circuit 640, and the DA converter 65
DA conversion is performed. The output of the DA converter 65 is output as an output video signal SVO which is stored in the frame memory 71, while an audio signal is extracted by an audio signal separator 66, and the extracted audio signal is converted into PCM.
The signal is demodulated by the processor 67 and stored in the RAM 69 via the RAM controller 68. Furthermore, the audio signal stored in the RAM 69 is applied to the DA converter 70 via the PCM processor 67, converted into an analog signal, and output as a reproduced audio signal 5AOUT.

Recording processing timing of the audio signal To be specific, the 5-man powered audio signal 5A111 has a PCM processor 48.
The video signal is stored on the disk 55 with a delay from the video signal of the corresponding field by the time of PCM modulation, that is, the time of 11 frames (FIGS. 8(a) to (C)).
. For example, when using a CAV disc that records one frame of video per revolution, the audio signal of the video signal is recorded using a single laser, so the field video signal VIDE of n
O! 1 is recorded on track m of the disk 55,
The audio signal AUDTon of the same n fields is recorded in trunk m+1, one trunk outside, by the amount of the delay. FIG. 10 shows the positional relationship between the laser beam spot 5POTI when recording a video signal and the laser beam spot SPOT2 when recording an audio signal.

The reproduced audio signal also lags behind the video signal by one frame by the PCM demodulation time (FIG. 8(C) to (e)).

Since the reproduced video signal and the reproduced audio signal of the same field n must be output at the same time, 1. For this time adjustment, a frame memory 71 is provided in the reproduced thread PB to store the reproduced video signal from the DA converter 65. The frame memory 71 outputs an output video signal 5vout whose timing is aligned with the output audio signal 5Aouy. Each sound in the frame memory 71 requires a capacity equivalent to at least one frame of the video signal, but in this example, the adjustment time is equivalent to one frame of two frames, and the capacity of the frame memory 71 is equivalent to one frame of two frames.

[Problem to be solved by the invention]

If the frame memory 71 is provided in the recycled yarn PB, there is a problem in that the device becomes expensive.

Next, since the audio signal is delayed by one frame with respect to the same video signal, when dubbing is performed, a delay of l frames is accumulated, causing the problem that the correspondence between the reproduced audio signal and the reproduced video signal is out of order. .

Furthermore, since the video signal and audio signal of the same field are recorded on different trunks, there is a problem that when attempting to erase a predetermined video signal and audio signal, an audio signal that should not be erased will be erased.

The video disk system has been described above as an example, and a first signal and a second signal that has a temporal relationship with this signal and has a processing time different from that signal are simultaneously recorded and reproduced at corresponding positions. Problems similar to those described above occur in other devices.

Accordingly, one aspect of the present invention is to record a plurality of signals related to each other in a predetermined time relationship such as frame units and having different recording processing times on the same continuous recording medium, and to record the signals recorded in this way. The purpose is to reproduce the original temporal relationship.

[Means and operations for solving the problems] In order to solve the above-mentioned problems, the present invention stores a plurality of signals having different signal processing times in consecutive positions on a recording medium.

For this reason, the recording device of the present invention independently processes signals recorded via a plurality of nodes disposed in a predetermined positional relationship and recording recording signals on a recording medium, and the nodes. and a plurality of signal processing circuits.

[Operation] A signal that requires a long signal processing time in the signal processing circuit, for example, an audio signal in a video disc system, is processed through a vent that operates temporally ahead of the plurality of heads to reduce the signal processing delay time, for example. , the recording medium is recorded by shifting the position of the recording medium by a position corresponding to one frame, for example, 1) rack.

In this way, by recording signals that require processing time using the preceding head and at positions that are shifted according to the processing time, it is possible to record signals that do not require processing time, for example, at positions that are consecutive to the recording position of video signals. recorded.

〔Example〕

As an embodiment of the present invention, FIG. 1(a) shows a block diagram of the recording system REC of a video disc system, and the block diagram of the reproduction system PB corresponding to the recording system RFC is shown in the first block diagram.
Shown in Figure (b).

The recording system REC includes a video signal encoder 1, an FM modulator 2. A video signal recording processing circuit consisting of a laser driver 3, an audio signal encoder 5, and an FM modulator 6.
It consists of an audio signal recording processing circuit consisting of a laser dryer, a timing controller 4 and a multi-beam laser 8. The multi-beam laser 8 has two lasers, a video signal recording laser and an audio signal recording laser, and these two lasers are mounted on two recording heads 111 and 112 (FIG. 2).

The video signal recording processing circuit and the audio signal recording processing circuit independently process the video signal and audio signal, and the two lasers of the multi-beam laser 8 are attached by timing control to the laser driver 3.7 of the timing controller 4. to strengthen

FIG. 2 shows a detailed circuit configuration of the recording system REC shown in FIG. 1(a).

The video signal encoder l is an AD converter lQl, F
IFO memory 1021 time axis compression control circuit 103. D.A.
Consisting of a converter 104, these circuits 101 to 1
03 is the AD converter 41.03 in FIG. FIFO/
This is similar to the 2-frame memory 42 and the time axis compression control circuit 43. The DA converter 104 is provided to perform FM modulation in the FM modulator 2 independently of the audio signal. Input video signal in analog format S V I N
is converted into digital format by the AD converter 101,
The video signal stored in the FIFO memory 102 is time-domain compressed by the time-domain compression control circuit 103, the time-domain compressed video signal is converted into an analog format by the DA converter 104, FM modulated by the FM modulator 2, and then sent to the laser driver 3.
is recorded on a predetermined track of the disk 15 via the second laser of the multi-beam laser 8. Second
The laser is mounted on the second head 112.

The audio signal encoder 5 includes an AD converter 501,
PCM modulation circuit 502. RAM controller 503. R
AM504. 1 circuit 5 consists of DA converter 505
01 to 504 are converters 47. PCM
Modulation circuit 48. RAM controller 50. It is similar to RAM51. Analog format input audio signal S A
IN is converted into a digital format by an AD converter 501, PCM modulated by a PCM modulation circuit 502, and D
The analog format audio signal Q is converted by the A converter 505, FM modulated by the FM modulator 6, and transmitted from the first laser mounted on the first head 111 via the laser driver 7 to a predetermined area of the disk 15. recorded in the trunk.

The first laser mounted on the first head 111 is
The positional relationship with the second laser mounted on the head 112 is shown in FIG. 3(a). The first 7F for audio signal recording [11 is the second 7F' for video signal recording.
It is located at a position preceding 112. 1st 7 To-11
A first laser mounted on the head 112 irradiates the disk 15 with a first beam SPOT1, and a second laser mounted on the second head 112 emits a second beam SPOT2. The disk 15 is irradiated with light.

Also in the circuit shown in Figure 2, the audio signal is PCM
It lags behind the video signal of the same field by an amount of I frame that undergoes modulation processing. Taking this delay into consideration, the timing controller 4 controls the driving timing of the laser driver 3 and the laser dryer huff. That is, the leading first head 111 accesses the outer track m+1.

The trailing second head jl 12 accesses the track m4. In this example as well, the disk 15 is a CAV disk in which one frame of data is recorded.

The positional relationship between the video signal and audio signal to be recorded is
Shown in Figure (b). According to the above processing.

The video signal VIDEOn and audio signal AUD I On of the same field n are continuously recorded on the same track m.

FIG. 4 shows a waveform diagram within one frame (IH) of the recorded audio signal. Synchronous signal SYNC.

First color difference signal R-Y with audio signal AUD10.3 value
, a ternary second color difference signal [3-Y, and a luminance signal Y.

As shown in FIG. 1(b), the recycled yarn PB is passed through a video signal detection detector 21. Amplifier 22. FM demodulator 23. A video signal reproduction processing circuit consisting of a video signal decoder 24 and an audio signal detection detector 25. Amplifier 26. F
It has an audio signal reproduction processing circuit consisting of an M demodulator 274 and an audio signal decoder 28. The detector 21 and the detector 25 are mounted on first and second reproduction heads (not shown). In this way, the corresponding recycled yarn P
Also in B, the video signal reproduction processing circuit and the audio signal reproduction processing circuit are configured independently.

The operation processing of the video signal reproduction processing circuit and the audio signal reproduction processing circuit is opposite to the processing of the video signal recording processing circuit and the audio signal recording processing circuit of the recording system REC.

FIG. 5 shows the detailed circuit configuration of FIG. 1(b).

The video signal decoder 24 includes an AD converter 241, F
IFO242, time axis expansion/TBC control circuit 243.0
A converter 244, these circuits are AD converter 62, FIF063 . This is similar to the time axis expansion/TBClii control circuit 64 and the DA converter 65. Moreover, the audio signal decoder 28
converter 281, PCM demodulation processor 282. R.A.
M controller 283. RAM284. It consists of a DA converter 285, and these circuits 67 to 70 are connected to P in FIG.
CM processor 67, RAM controller 6B, RAM
69. It is similar to the DA converter 70.

The relationship between the track number on the disk 15 detected by the detectors 21 and 25 and the position of the beam spot 5POT1.2 is shown in FIG. 3(C). In the playback process as well, the audio signal is delayed by one frame relative to the video signal due to PCM demodulation.1 Considering this delay and the recording arrangement of the audio signal AUDIO and video signal VIDEO shown in FIG. The audio signal AUDIOn'-, 1 of the field fnf 1 recorded on rn+1 is read at the position of beam spot 5POTI by a preceding reading node equipped with a detector 2.5, and is recorded on track m. The reading of the video signal VIDEOn of field n is carried out by the subsequent reading in which the detector 21 is mounted.

This is done at the position of the beam spot 5POT2.

As a result, the output video signal 5VOLIT output from the DA converter 244 and the output audio signal 5AOUT output from the DA converter 285 are of the same field.

In the above embodiment, the case where the recording processing of the 7-video signal is delayed by one frame with respect to the recording processing of the video signal was shown, but if the recording processing of the 7-video signal is delayed by 2 frames, the case shown in FIG.
) Recording is performed on a track two trunks away from the recording on the adjacent track shown in ).

6th [1J(a) and (b) show the configuration of the video disc stem of the first embodiment. This video disc system includes an FM modulator 2. The FM modulator 6 is shared by the FM modulator 11, and therefore a multiplexer 1O is provided, and the FM demodulators 23 and 27 shown in FIG. 30, and an audio signal separator 32 for extracting the audio signal from the FM demodulator 31. The functions of this video disc system are equivalent to those of the video disc system shown in FIGS. 1(a) and 1(b).

Although the above embodiments illustrated a video disc system, two
The present invention is applicable to recording and reproducing two or more temporally related signals, and although the signal processing times are different, multiple pieces of data are recorded while maintaining the same time and recording position on the recording medium. The present invention can also be applied to other devices that require storage and reproduction in the same time-related manner, such as magnetic tape devices.

(Effects of the Invention) As described above, according to the present invention, two or more signals having different signal processing times can be simultaneously reproduced. As a result, there is no need to provide a memory for timing adjustment.

Further, according to the present invention, since a plurality of pieces of data at the same time are recorded while maintaining the same positional relationship, various subsequent signal processing such as reproduction processing can be performed smoothly.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are block diagrams of a multi-beam laser one-type video disk system as a first embodiment of the magnetic recording apparatus of the present invention. FIG. 2 is a detailed configuration diagram of the circuit shown in FIG. 1(a). 3(a) to 3(C) are signal processing configuration diagrams explaining the operation of the video disc system of FIG. 1. FIG. 4 shows a recording signal waveform in the video disc system of FIG. 1. FIG. 5 is a detailed configuration diagram of the circuit shown in FIG. 1(b). FIGS. 6(a) and 6(b) are block diagrams of a video disc system using a multi-beam laser as a second embodiment of the magnetic recording apparatus of the present invention. FIG. 7 is a block diagram of a conventional video disc system. FIG. 8 is a signal processing timing diagram by the video disc system of FIG. 7. 9 and 10 are signal processing diagrams illustrating the operation of the video disc stem of FIG. 7. (Explanation of symbols) 1...Video signal encoder, 2,6...FM modulator,
3.7... Laser driver, 4... Timing controller, 5... Audio signal encoder, 8... Multi-beam laser, 21° 25... Detector, 22.26
...Amplifier, 23.27..FM demodulator, 24..Video signal decoder, 28..Audio signal decoder.

Claims (1)

[Claims] 1. A recording device that stores a plurality of signals having different signal processing times at consecutive positions on a recording medium, comprising a plurality of heads arranged in a predetermined positional relationship and recording the signals on the medium, and the head. a plurality of signal processing circuits that independently process signals recorded through the plurality of heads, and a signal processing circuit that requires a long signal processing time in the signal processing circuit is processed through a head that operates temporally ahead of the plurality of heads. A recording apparatus characterized in that the recording apparatus is configured to perform recording by shifting the position of the recording medium by a position corresponding to the signal processing time.