JPS59217208A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a video signal without causing the horizontal synchronizing signals of a reproduced video signal and a video signal to be recorded to be dissident in phase by comparing the synchronizing signal in the reproduced video signal with the synchronizing signal in the video signal to be recorded, and controlling the time base of the video signal to be recorded on the basis of the comparison output. CONSTITUTION:The video signal V containing a component to be recorded is supplied to an input terminal 5 to obtain the horizontal synchronizing signal FH and vertical synchronizing signal FV in the video signal, and they are supplied to one-side terminals of phase comparing circuits 8 and 9. A frequency deviding circuit 22 is reset for every reproduced vertical synchronizing signal RV to divide the frequency of a pulse signal G, and an output signal G' which has one or two pulses in every turn of a disk 1 is supplied to the other input terminal of the phase comparing circuit 9. The phase comparing circuit 9 compares the phase of the vertical synchronizing signal FV with that of the output signal G' to generate the comparison output S1 corresponding to the phase difference between both at the output terminal, and the output is supplied to the control terminal of a motor 3 for disk rotation through a driving circuit 23 for control.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the entire recording of video signals on a disc having a recording surface adapted for recording video signals, and Disc background technology and its problems for reproducing video signals from discs that have been recorded A spiral groove for tracking during recording is formed in advance on the recording surface, so that the signal can be recorded only - times, for example. A recordable disc has been proposed. When recording a video signal using a disc recording device using such a recordable disc, for example,
After the disk is rotated at a predetermined rotational speed and a video signal is recorded on the rotating disk for each field period or one frame period per rotation, halfway 1 of the recording surface, a recording track is formed. , once the recording is stopped and the disk is removed from the disk recording device, after the seventh disk is inserted into the disk recording device again and rotated, starting from the middle of the recording surface, / per rotation /
When a video signal is edited and recorded to form a recording track by recording the video signal for each field period or frame period, the entire rotation of the disk is recorded. or a frame synchronization signal), for example, due to eccentricity associated with a rotating disk, the recording tracks on the disk that were recorded before the disk was once removed from the disk recording device may Horizontal synchronization signal in each field period or each frame period between the video signal in the recording track on the disk and the video signal in the recording track on the disk that was once removed and reinstalled. Therefore, the horizontal synchronization f on each recording track, the alignment relationship of the recording position of No. N,
There is a risk that the so-called H arrangement may not be properly obtained.

phase mismatch of horizontal synchronization signals of such recorded video signals;
And the disorder of the H line? When a video signal is reproduced from a disc on which the same recording has been performed, jumping of the horizontal synchronization signal in the reproduced video signal occurs at the junction between the previous recorded part and the recorded part after the previous recorded part. Moreover, in a portion where a recording track of a previous recording portion and a recording track of a subsequent recording portion are adjacent to each other, crosstalk and interference between the tracks due to the horizontal synchronization signal occur significantly.

Purpose of the Invention In view of the above, the present invention provides that when editing and recording a video signal as described above using a recordable disk, even if the fully rotatable Deinek is eccentric, Signals can be recorded on each recording track on all disks without phase mismatch in the horizontal synchronization signal of the video signal between them, so that the H arrangement is properly maintained. In addition, there is a disc recording and reproducing device f! that can reproduce all video signals from the disc on which the video signals have been recorded. The entire purpose is to provide

SUMMARY OF THE INVENTION A disk recording and reproducing apparatus according to the present invention is provided with a disk on which a video signal can be recorded, and when recording all video signals on this disk, reproduces video signals already recorded on the disk. What is the synchronization word in the water playback video signal obtained by doing this, and the synchronization signal in the video signal recorded on the disc? Based on the comparison output obtained by this comparison, the time axis control of the video signal recorded on the disk is performed. According to the disc recording and reproducing apparatus according to the present invention, the phase of the horizontal synchronization signal of the video signal recorded on each recording track of the disc can be made to have no mismatch, and therefore, The H arrangement between each recording track can be maintained appropriately.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an entire example of a disc recording/reproducing apparatus according to the present invention. This example is an optical disc recording and reproducing device that optically records a video signal on a recordable disc and optically reproduces the video signal from the disc on which the video signal has been recorded. .

First, the disk used in this example will be described.A spiral groove for tracking during recording is formed on the recording surface of the disk.For example, when exposed to a recording laser beam, A photosensitive material whose reflectance can be varied is provided, so that a recording track on which a video signal is optically recorded can be formed.

The disk thus formed is mounted on the disk mounting portion λ of an example of the disk recording and reproducing apparatus according to the present invention, and is rotated by the disk conversion motor 3 at a predetermined number of rotations. In connection with this disk rotation motor 3, there is disposed a frequency generator which generates a signal with a pulse having a number of revolutions corresponding to the rotation speed of the motor 3 and therefore the rotation speed of the disk-1.

An input terminal S is provided to which a video signal from the outside to be recorded on the disk is supplied. It is connected to each input terminal of the circuit 7. The output terminals of the horizontal synchronization signal separation circuit B and the vertical synchronization signal separation circuit 7 are connected to one input terminal of each of the phase comparison circuits g and f.

The input terminal is also connected to the input terminal of the variable delay circuit 10, and the variable delay circuit 1 is connected to the input terminal of the variable delay circuit 10 to obtain a delayed video signal.
The output terminal of 0 is connected, for example, to the input terminal of a modulation circuit // that carries out a frequency shift p+*.

The output terminal 1 of the modulation circuit // is connected to the input terminal of the recording/reading section 9/4 via a recording amplifier circuit /2 and a switch /3.

The recording/reading section 9/ll has a fully variable recording laser beam for the video signal modulated by the modulation circuit.
By making the modulated recording laser beam, that is, the recording laser beam corresponding to the content of the video signal, enter, for example, onto the spiral groove of the disk, the video signal is transferred to the disk with each rotation of the disk. For example, a recording unit that records for each frame period to form a recording track, and a reading laser 5Y: for example, a recording unit that records a video signal formed on the disk/4'. It is composed of a reading section that detects all of the reflected laser light incident on the track and reads the video signal sound recorded on the disk, the disk's /゛rotation/field period, or / frame period. has been done.

The output terminal of the recording/reading section 9/4, that is, the output terminal of the reading section 1 is connected to the input terminal of the demodulating circuit/B via the reproduction amplification circuit 15. The output end of the demodulation circuit/B is connected to the respective input ends of the horizontal synchronization signal separation circuit/7 and the vertical synchronization signal separation circuit/g, and outputs the demodulated reproduced video signal to the outside.

The output terminal of the horizontal synchronization signal separation circuit /7 is connected to the other input terminal of the phase comparison circuit, and the output terminal of this phase comparison circuit is connected to the output terminal of the horizontal synchronization signal separation circuit /7 through the switch /9 which is interlocked with the switch /3.
It is connected to the input end of the memory 20. Memo IJ-,
20 is a phase comparator circuit g during each rotation of the disk.
The readout circuit 2 is assumed to have a memory capacity that can store all the comparison outputs sent from the readout circuit 2.
/ is connected, which allows writing or reading during each revolution of the disk /. The output terminal of the memory 20 is connected to the variable delay circuit 10.
0 control terminal.

Further, the output terminal of the frequency generator g is connected to the input terminal of the frequency dividing circuit 22, and the output terminal 1 of the vertical synchronizing signal separation circuit/g is connected to the reset terminal of the frequency dividing circuit 22. There is. The frequency divider circuit 22 is reset by the output of the vertical synchronization signal divider circuit /g, and divides the entire pulse signal from the frequency generator to produce a pulse per revolution of the disc or half a revolution of the disc. generates an output signal that yields a per/pulse. The output end of the frequency divider circuit λ from which this output signal is obtained is connected to the other input end of the phase comparison circuit 9, and the output end of the phase comparison circuit 9 is connected to the disk via the control drive circuit 23. It is connected to the control end of the rotation morph 3.

In the example shown in FIG. 1 with such a configuration, the video signal from the input terminal S is transmitted through the variable delay circuit 10, the modulation circuit /2, the switch /3 and The video signal is recorded on the disk via the recording section of the recording/reading section/I, and the video signal recorded on the disk is transferred to the reading section of the recording/reading section/I, the reproduction amplification circuit/S, and the demodulation circuit. The video is played through /B, but the
When editing and recording a signal, that is, the video signal has already been recorded on the recording surface of the disk in the middle part 1, and the video signal from the input terminal S is recorded from the middle part of the recording surface. The case where recording is started will be described below.

A video f-word V containing the part to be recorded at the input terminal S
is supplied, and this video signal (2) is supplied to the horizontal synchronization signal separation circuit B and the vertical synchronization signal separation circuit 7, and the horizontal synchronization signal FH and vertical synchronization signal Fv in the video signal V are obtained from the respective circuits, It is supplied to one input terminal of each of the phase comparator circuits g and wo. And first, switch/
3 is turned off, switch /9 is turned on, and the video already recorded on the disk / is played back. The recorded video signal is read from the disk rotated by the disk rotation motor 3 for each field period or frame period per rotation of the disk by the reading section of the recording/reading section. The read output is supplied to the demodulation circuit/B through the entire reproduction amplification circuit 15, and a demodulated reproduction video signal VR is obtained from the demodulation circuit/B. This reproduced video signal vR is supplied to a vertical synchronizing signal separation circuit /g to obtain a reproduced vertical synchronizing signal Rv, which is supplied to the reset terminal of the frequency dividing circuit 22. The input terminal of the frequency divider circuit 2.2 is supplied with the pulse signal G from the frequency generator G, and the frequency divider circuit 22 is reset to the reproduction vertical synchronization signal Rv 475, and the pulse signal G' is frequency-divided and the output signal G' from which a pulse or a λ pulse is obtained per rotation of the disk is supplied to the other input terminal of the phase comparator circuit 9. It is supplied to the other input terminal of the phase comparator circuit 7. In the phase comparator circuit W, a phase comparison is made between the vertical synchronization word Fv and the output signal G', and a comparison output S/ corresponding to the phase difference between the two is obtained at its output terminal. It is supplied to the control end of the disc rotation motor 3 through the control drive circuit 23, and when the disc rotation motor 3 is set to 1 comparison output S/, the rotation of the disc l is synchronized with the vertical synchronization signal -Fv. It is controlled so that it becomes what it is. − Also, if the reproduced video signal VR is the horizontal period 1δ separation circuit/
7 to obtain a reproduced horizontal synchronizing signal RH, which is supplied to the other input terminal of the phase comparator circuit. In the phase comparison circuit g, a phase comparison is made between the horizontal synchronization signal FH and the reproduced horizontal synchronization signal RH, and a comparison output S2 corresponding to the phase difference between the two is obtained at the output terminal, which is output to the switch. /9 to the input of the memory 20.

At this time, the memory 20 includes a write/read circuit, 2
A comparison output S from the phase comparator circuit is obtained during the rotation period of the disk /, that is, during the period in which the recording trunks/cycles are read 9 when the write control word Pw is supplied from /. The write is frozen and is written sequentially with each revolution of the disk.

When the reading position of the recording/reading section 9/11t reaches the recording end of the video signal that has been recorded up to the middle of the recording surface of the disk, switch /3 is turned on. At the same time, the switch /9 is turned off, and the recording unit of the recording/reading unit /ll starts recording the video signal from the portion following the recording end portion. At the time of starting this recording, the memory 20 contains the playback horizontal synchronization signal RH obtained from the last/period t of the recording track related to the video signal recorded up to the middle part of the recording surface of the disk, and the horizontal synchronization signal Comparison outputs S and 2L based on phase comparison with FH are stored. Then, the read control signal PR from the write/read circuit 2/ is supplied to the memory 20, and the comparison output S2L is repeatedly read out from the memory 20 for each rotation period of the disk. The signal is supplied to the control end of the variable delay circuit 10 as a control signal for the amount of delay.

At this time, the video signal V from the input terminal +3 is supplied to the variable delay circuit 10 whose delay amount is controlled by the comparison output S2L read out from the memory 20, and the video signal V from the memory 20 is supplied to the comparison output S2L from the memory 20. A corresponding delay is made, so that the horizontal synchronizing signal is synchronized with the horizontal synchronizing signal in the recorded video signal recorded on the last cycle t of the above-mentioned recording track on the disk. ,
Time axis is controlled. The delayed video signal V' obtained at the output terminal of the variable delay circuit 10, which has been subjected to time axis control in this manner, is supplied to the modulation circuit // where a predetermined frequency modulation is performed, and the video signal V' is A modulated video first word V" is immediately obtained. Modulated: raw video signal y/
/ is supplied to the recording section of the recording/reading section /q via the recording amplifier circuit /, 2 and switch /3''k.
This recording section allows the video signal V' to be recorded in the form of a modulated video signal V'' on the recording surface of the disk.
During the period in which the recording section of the recording/reading section/g is still recording after the recording track is formed by recording from the part following the end of the last/circle section (B) of the above-mentioned recording track, The phase comparator circuit 7 receives a vertical synchronizing signal J.
At the same time, the pulse signal G from the frequency generator is supplied via the frequency divider circuits 2 and 2, and the vertical synchronizing signal FV and the pulse signal are output from the phase comparator circuit. A comparison output is obtained by comparing the phase with the signal G, and in addition to this, the disk rotation motor 3 is controlled by the control XI 8.
The rotation of the disk / is maintained in synchronization with the vertical synchronization signal FV.

As a result, the horizontal synchronization signal in the video signal recorded later on the recording track following the last/circle of the above-mentioned recording track on the disk will not change even if there is eccentricity on the disk. , it is assumed that the phase coincides with the horizontal synchronizing signal in the video signal recorded earlier in the last/round B of the above-mentioned recording track, and therefore, The recording track related to the recorded video signal and the video signal 6 that has been completely recorded since then.
4. between the recording track related to the issue. The H arrangement will be taken appropriately. Therefore, at the time of playback, at the joining part of the recorded part of the video signal recorded earlier in the last/period tg of the above-mentioned recording track and the recorded part of the video signal recorded subsequently. Also, there is no jump in the horizontal synchronization signal of the reproduced video signal, and the difference between the end of the history/period l of the recording track described above and the adjacent recording trunk related to the video signal recorded later. There is also no noticeable crosstalk interference between tracks due to horizontal synchronization signals.

In the example shown in FIG. 1, instead of the horizontal synchronizing signal separation circuit B, phase comparison circuit g, and switch /7,
As shown in FIG. 2, a horizontal synchronizing signal separation circuit 2+ is connected to the output terminal of the variable delay circuit 10 and extracts the horizontal synchronizing signal FH' from the video signal V'! , complete phase comparison of horizontal synchronization signal FH' obtained from horizontal synchronization signal separation circuit 2'l and reproduced horizontal synchronization signal RH, comparison output S, 1'f
phase comparator circuit for fi generation, 2 phase comparator circuit 2
Arranged between the output end of Ushio and the input end of memory, 20,
Recording/reading 9 copies/Disc through 4t reading 9 copies/
It is turned on only when the video signal recorded in the video signal is played back, and the recording/reading section/ When the video signal recorded on the disc/ is played back through the reading section 9 of the I!, it is supplied to the comparison output S2', switch 2, which provides a readout output from the memory, 20 when recording takes place;
It is also possible to use a circuit group consisting of 7. In this case, the horizontal synchronization signal FH' in the video signal V' is used instead of the horizontal synchronization signal FH in the video signal V, and the same effect as in the example shown in FIG. 1 is obtained. be able to.

In addition, in the double example, after the recording section of the recording/reading section 1 starts recording the video signal onto the disk, the memory contents are gradually erased to zero as time elapses in the memory 20. You may also perform some actions. In this way, it is possible to avoid any possibility that the usable range of the variable delay circuit 10 will be exceeded as the editing and recording of the video signal is repeated.

Furthermore, although the above-mentioned example is an optical disc recording/reproducing apparatus, the disc recording/reproducing apparatus according to the present invention includes:
The method is not limited to this, and other methods may also be used.

Effects of the Invention As is clear from the above description, the disk recording and reproducing apparatus according to the present invention can be used to edit and record a video signal using a recordable disk that is capable of recording Video No. 1g. , even if the rotated disk is eccentric, the horizontal synchronization signal of the video signal recorded on the disk first and the video signal recorded later will be the same as the horizontal synchronization signal of the video signal recorded first. It is assumed that the signal and the phase match, and therefore the 1 (order) between each recording trunk on the disk where recording was performed
It is now possible to record video signals that can be properly captured. Therefore, when a video signal is reproduced from a disc on which a video signal has been edited and recorded by the disc recording and reproducing apparatus according to the present invention, even at the joining part between the earlier recorded part and the later recorded part, There is no risk of jumping of the horizontal synchronization signal in the reproduced video signal, and even in areas where the recording track of the earlier recorded part and the recording track of the later recorded part are adjacent, the horizontal synchronization signal can be used to There is no significant crosstalk interference between the two.

[Brief explanation of the drawing]

FIG. 1 is a block connection diagram showing an example of a disk recording/reproducing apparatus according to the present invention, and FIG. It is a block connection diagram showing a circuit group. In the figure, /Hadisk, 3 is a motor for rotating the disk,
/7 and 2g are horizontal synchronization signal separation circuits, 7 and 7g are vertical synchronization signal separation circuits, g, 9 and 2 left are phase comparison circuits,
10 is a variable delay circuit, /G is a recording/reading section, /B is a demodulation circuit 1.20 is a memory. Agent Patent Attorney Sadaaki Kanbara 2. ::t ,;)・ ,
' Seal Figure 2

Claims (1)

[Claims] When a disk on which a video signal can be recorded is loaded and the entire video signal is recorded on the disk, the synchronization signal in the reproduced video signal obtained by reproducing the video signal already recorded on the disk. , a disk in which the video signal recorded on the disk is completely compared with a synchronization signal in the video signal, and the time axis control of the video signal recorded on the disk is performed based on the comparison output obtained by the comparison. Recording and playback device.