JPS6132692A - Video disk device - Google Patents

Abstract

PURPOSE:To make a video disk device applicable not only to a camera but also to a television by recording a luminance signal and a chrominance signal on different recording channels in a camera mode, then recording a MUSE signal on the same channel as that of the luminance signal in a telelvision mode and switching a feed speed of a transducer, etc., in accordance with the mode. CONSTITUTION:In a camera mode, switches S1, 2 and S3 are connected to the side of a contact point C, and a Y signal, chrominance signals CW and CN are applied to input terminals 2, 3 and 4, respectively. In regard to the Y signal, a track 30 is recorded on a magnetic disk 12 by a magnetic head 10. The chrominance signals CW and CN are applied to a magnetic head 11, and a track 31 is recorded. In a television mode, the switches S1, S2 and S3 are connected to the side of a contact point T, and a track 32 of a MUSE signal applied to an input terminal 1 is record by the magnetic head 10. In the telelvision mode, a line speed of the disk 12 is switched to 2/5 times in the camera mode, which corresponds to about a 2/5 reduction in FM carrier frequency. Assuming that a recording track pitch of the Y signal and that of the chrominance signal are set P1 and P2, respectively, a head feed speed is set to be P1/(P/+P2) times in the camera mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rewritable video disc device for recording high-definition TV signals.

[Prior art]

As is well known, a high-quality TV signal consists of a luminance signal with a frequency band of 20'MHz (hereinafter referred to as the Y signal) and a 7MHz frequency band.
z broadband color signal (hereinafter referred to as color signal CW') and 5.5
It is composed of a MHz narrowband color signal (hereinafter referred to as color signal CN). In addition, MUSE (Multiple 5u
b-Nyquist Sampling Encodi
ng) The frequency band of the signal is compressed, and the frequency band is 8MHz.
It becomes.

FIG. 1(al) shows the frequency spectrum of the Y signal 1-wave signals CW and CN, and FIG. 1(b) shows the frequency spectrum of the MUSB signal.

Therefore, as a rewritable video disk device that records the above-mentioned high-definition TV signals, there is a video disk device that is compatible with high-definition cameras (hereinafter referred to as a camera-compatible disk device) that records the Y signal 9 signals CW and CN. and M.U.
A high-definition TV-compatible video disc device (hereinafter referred to as a TV-compatible disc device) that records SE signals is considered.

In the above-mentioned TV compatible disk device, when recording the MUSE signal, it is recorded in one channel in concentric circles for still screen recording and in a spiral for moving image recording. In addition, the camera compatible disk device records the Y signal 2 signals CW and CN created from the R, G, and B signals of the camera output.
The Y signal is recorded in the Y signal recording channel, and the color signal CW
, CN are line-sequentially made into one channel and recorded in the color signal recording channel, and are composed of a total of two recording channels. The recording trunks are concentric circles for still image recording, and spiral for video recording.

In the TV-compatible and camera-compatible video disk device (hereinafter simply referred to as a disk device) configured as described above, the TV-compatible disk device cannot record camera output that requires two recording channels. , Also, with a camera-compatible disk device, the MUSE signal can be recorded in the Y signal recording channel, but the 20MHz Y
8MHz MU'S on the recording channel that can record the signal
Since the E signal is recorded, it is inefficient. Furthermore, in this case, since the color signal is not recorded in the recording channel, there are drawbacks such as poor utilization of the disk.

[Summary of the invention]

The present invention has been made in view of this point, and it records the brightness signal and color signal of a high-definition TV signal in separate recording channels, and further records the MUSE signal in the recording channel of the brightness signal by mode switching. At the same time, by switching the feed speed of the transducer that records signals on the disk, the rotation speed of the disk, and the FM carrier frequency during FM modulation of each signal, a single device can be used for both cameras and TVs. The purpose of the present invention is to provide a video disc device that can support both.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure shows a block configuration diagram of a video disc device according to an embodiment of the second invention of the present application, and in the figure, 1
is the MUSE signal input terminal, 2.3.4 are each Y signal 1
Input terminal compatible with camera for CW and CN signals, switch S
1, 32, and 33 are switches that are switched by a mode changeover switch (not shown) for camera compatible and TV compatible modes provided on the disk device;
If it is compatible with a camera, it is connected to contact C. 5 is an FM modulator for FM modulating the Y signal or MUSE signal, and 6 is a recording amplifier. Sui Nochi S4. S5 and S6 are recording/reproducing mode switching switches which are connected to contact R2 in the recording mode and to contact P in the reproducing mode. 7 is color signal CW, CN
8 is an FM circuit that performs FM modulation of the color signal.
The modulator, 9, is a recording amplifier. 10 is Y signal or MU
A magnetic head (transducer) that records SE signals,
1) is a magnetic node (transducer) that records line-sequential color signals. 12 is a magnetic disk (hereinafter referred to as a disk), 13 is a motor, 14 is a throat support for supporting the magnetic heads 10.1 arranged side by side, and 15 is a support for feeding the magnetic head support 14 in the radial direction. The head feeding mechanism 16 is a head feeding control circuit that drives and controls the head/gutter feeding mechanism.

17 is a reproduction amplifier that amplifies the reproduction signal of the magnetic head 10; 18 is an FM demodulator for Y signal or MUSE signal; 19
2 is a reproduction amplifier for amplifying the reproduction signal of the magnetic head 1) for color signals, 20 is an FM demodulator for color signals, and 21 is a line-sequential inverse conversion circuit. 22 is an output terminal for the reproduction MUSE signal;
23, 24゜25 are Y signals 2 and 2 signals C corresponding to cameras, respectively.
These are output terminals for W and CN.

26 and 27 are synchronization separation circuits for separating the horizontal synchronization signals for the MUSE signal and the Y signal, respectively; 28 is the disk 1
Control the rotation speed of the motor 13 so that the linear velocity of the motor 2 is constant.
29 is a motor amplifier that drives the motor 1).

Next, the operation of this embodiment will be explained. The disk device of this embodiment is compatible with both cameras and TVs, and the mode is selected by a mode changeover switch (not shown).

First, the case of camera mode will be explained. By setting the mode selector switch (not shown) to camera mode, switch 31. S2. S3 are each connected to the contact C side. Y signal 1-pass signals CW and CN are applied to input terminals 2, 3, and 4 corresponding to cameras, respectively. The Y signal passes through switch S1, is applied to FM modulator 5, and is FM modulated. This FM signal is amplified by a recording amplifier 6. In the recording mode, switches 34, 35 . Since S6 is connected to the contact R side, the FM signal amplified by the recording amplifier 6 is sent from the switch S4 to the magnetic disk 12 by the magnetic head 10.
recorded in

On the other hand, the color signal CW is applied to the input terminal 3.4.

CN is converted into a line-sequential color signal by a line-sequential conversion circuit 7 and
The signal is channelized and FM modulated by an FM converter 8. This FM signal is amplified by a recording amplifier 9, applied to a magnetic head 1) via a switch 5, and recorded on a disk 12.

At this time, the tracks recorded by the magnetic head 10.1) are spiral, and the pattern is shown in Figure 3(a).
Shown below. In the figure, 30 indicates a Y signal recording track (shaded area in the figure), and 31 indicates a color signal recording track (shaded area in the figure). The Y signal recording track pitch is Pl,
The color signal recording track pitch is P2. As shown in FIG. 1, the frequency band of the color signal is narrower than that of the Y signal, so P2<Pl. In addition, in the figure, the area between the recording tracks and not shaded is a guard space.

Next, disk rotation speed control will be explained.

During recording, the CLV servo circuit 28 moves the magnetic head 10°1)
The rotational speed of the motor 13 is controlled according to the radial position of the disk 12 to keep the linear velocity of the disk 12 constant.

The output of the CLV servo circuit 28 is amplified by a motor amplifier 29 to drive the motor 13. The head feed control circuit 16 is a circuit for controlling the speed at which the magnetic head 10.1) is fed in the disk radial direction as described above.
Since the linear velocity of the magnetic head 10.2 is constant, the head feeding speed is changed depending on the position of the magnetic head 10.1) in the disk radial direction so that the recording track pinch becomes P1+P2. That is,
When the head is located on the outer periphery of the disk, the disk rotation speed is slow (the head feed speed may be slow), but when the head is located on the inner periphery of the disk, the disk rotation speed is high and the head feed speed must also be fast.

The output of the head feed control circuit 16 that performs the above control is applied to the head feed mechanism 15 to move the head support 14 supporting the magnetic head 10.1) in the disk radial direction.
The recording track pitch of the magnetic head 10.1) is P1+P
Make it 2.

In this way, as shown in FIG. 3(a), the Y signal and the line sequential color signal are recorded by the magnetic head 10.1) at a track pitch of P1+P2.

Next, the operation during playback in camera mode will be explained. During playback, the head feed control circuit 16° and the head feed mechanism 15. The head support 14 operates in the same manner as during recording, and the magnetic heads 10.1) are brought into contact with the spiral Y signal recording trunk 302 and color signal recording trunk 31, respectively. The FM-modulated Y signal and color signal respectively reproduced from the magnetic head 10.1) are each applied to a reproduction amplifier 17.19 and amplified, and each is FM demodulated by an FM demodulator 18.20. A reproduced Y signal is obtained from the FM restorer 18, and is outputted to the output terminal 23 corresponding to the camera via the contact C of the switch S2. On the other hand, the reproduced line-sequential color signal is obtained in the FM demodulator 2°, and is added to the line-sequential inverse conversion circuit 21, where the color signal CW,
CN is taken out, and the color signals CW and CW are output to the output terminals 24 and 25.
CN is output.

Further, the reproduced Y signal which is the output of the FM demodulator 18 is applied to a Y signal synchronization separation circuit 27 to separate the horizontal synchronization signal. And now, since the mode is a playback mode compatible with the camera, the switch s3 is connected to the contact C side, and the switch S6 is connected to the contact P side, so the separated horizontal synchronization signal is applied to the CLV servo circuit 28. . This CL
The output of the V servo circuit 28 is applied to a motor amplifier 29 to drive the motor 13. During playback, the CLV servo circuit 28 controls the rotation of the motor 13 so that the input horizontal synchronization signal has a predetermined frequency. The number of magnetic heads is 10.
．． The linear velocity of the disc 12 is controlled according to the position in the radial direction of the disc 1) to be the same constant speed as during recording.

With the above operations, the camera compatible output terminals 23°, 24.
25, the Y signal 1 and the B signal CW and CN are reproduced, respectively.

Next, a case will be described in which the disk device is set to TV mode and the MUSE signal is recorded.

By setting the mode changeover switch (not shown) to TV mode, the switches Sl, S2. S3 are each connected to the contact T side. Also, the power to the color signal processing circuit is turned off.

First, we will explain the recording process. Since the disk device is in the recording mode, the switches 34, 35, and 36 are each connected to the contact R side. TV compatible MUSE added to input terminal 1
The signal is applied to the FM modulator 5 through the switch S1 connected to the contact T side. The FM modulator 5 is set to F so that a 20MH2 Y signal can be recorded and played back in camera mode.
M carrier frequencies are defined. However, MUSE
Since the signal band is approximately 8MH2, the F in TV mode is
The M carrier frequency is approximately 8/8 of the frequency in camera mode so that the recording wavelength is the same as in camera mode.
It is switched so that 20=215.

In this way, the FM carrier frequency of 21
The FM signal modulated by the carrier having the frequency No. 5 is applied to the recording amplifier 6, and recorded on the disk 12 by the magnetic head 10 in the same manner as in the camera mode.

The CLV servo circuit during recording in this TV mode also operates in the same way as in the camera mode, but the disc 12
In order to keep the recording wavelength constant, the linear velocity of
15.

Here, the gain of the motor amplifier 29 is switched to the optimum gain for the CLV servo.

Further, since only the magnetic head 10 records signals on the disk 12, the head feed control circuit 16 controls the magnetic head 10.
The pitch of the spiral MUSE signal recording trunk is controlled to be Pl. That is, the head feed speed is PI/(P1+P2) times that in the camera mode. Other operations are the same as in camera mode.

Through the above operations, the recording trunk of the MUSE signal recorded by the magnetic head 10 becomes a spiral track 32 with a recording track pitch of Pi, as shown in FIG. 3 (bl).

Next, the operation during playback in TV mode will be explained. During playback, the head feed control circuit 16. Head feeding mechanism 1
5. The head support 14 operates in the same manner as during recording, and the magnetic head 10 moves along the spiral MUSE signal recording track 3.
Confronts 2. The L-copper modulated MUSE signal reproduced from the magnetic head 10 is applied to a reproduction amplifier 17 and amplified, and then demodulated by an FM demodulator 18. The demodulated reproduced MUSE signal passes through the switch S2 connected to the contact T side and is output to the TV compatible output terminal 22.

Further, the reproduced MUSE signal which is the output of the FM demodulator 18 is applied to a synchronization separation circuit 26 for the MU♀E signal, and the horizontal synchronization signal is separated. This horizontal synchronization signal is transmitted to the contact T and the switch S3 connected to the contact side, respectively. switch S
6 and is applied to the CLV servo circuit 28. The CLV servo circuit 28 controls the rotation speed of the motor 13 according to the position of the magnetic head 10 in the disk radial direction so that the input horizontal synchronizing signal has a predetermined frequency during reproduction, and changes the linear velocity of the disk 12 from that during recording. Make it the same constant speed. The motor amplifier 29 operates in the same manner as during recording.

With the above operation, the MUS output terminal 22 corresponding to the TV
E signal is played.

According to this embodiment, in the camera mode, Y
The signal and the line-sequential color signal are recorded in separate recording channels, and in the case of TV mode, the MUSE signal is recorded in the Y signal recording channel, and the transducer feed speed is switched according to the recording track pitch of each mode. With this configuration, it is possible to easily obtain a disk device that can be used with both a TV and a camera by changing the switch, and has a good disk recording utilization rate.

In addition, in TV mode and camera mode, the relative speed of the disk and transducer and the carrier frequency of the FM modulator for both Y signal and MUSE signal are switched so that the recording wavelength does not change, making it easy to record MUSE signal. recording time can be increased.

Next, an embodiment of the second invention of the present application will be described. The block diagram in this case is exactly the same as that shown in FIG. 2 above. However, in this embodiment, only the head feeding mechanism 15, that is, the feeding speed of the head, is changed in response to switching between the camera mode and the TV mode.

Of course, even with such an embodiment, it is possible to obtain a disk device that can be used with both a TV and a camera by changing the switch, and has a good disk recording utilization rate.

In the above embodiment, a method in which the linear velocity of the disk is kept constant has been described, but the present invention can also be applied to a method in which the rotational speed of the disk is kept constant, and the same effects as in the above embodiment can be obtained.

Further, in the above embodiment, the case of a magnetic disk has been described, but this may be a rewritable optical video disk device such as a magneto-optical video disk, and the same effects as in the above embodiment can be obtained.

Furthermore, in the above embodiment, the case of recording a moving image using a spiral recording track has been described, but the present invention can also be applied to recording a still image using a concentric recording track by switching the feed speed of the transducer to achieve the same effect as in the above embodiment. is obtained.

〔Effect of the invention〕

As described above, according to the present invention, in the camera mode, the luminance signal and the color signal are recorded in separate recording channels, and in the TV mode, the MUSE signal is recorded in the luminance signal recording channel, and each mode The transducer feed speed, disc rotation speed, and carrier frequency when FM modulating each signal are changed according to the recording track pitch of the disc, making it compatible with both cameras and TVs, and making it easier to use the disc. An efficient disk device can be obtained, and the recording time when recording the MUSE signal can be easily increased.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the frequency spectrum of a high-definition TV signal, FIG. 2 is a block diagram of a disk device according to an embodiment of the present invention, and FIG. 3 is a diagram showing recording tracks on a disk by the disk device. be. 5.8-FM converter, 10. 1)-Navel I' (transducer), 12... Disk, 15... Head feed mechanism, 16... Head feed control circuit, 28...
...CLV servo circuit, 29...motor amplifier.

Claims (3)

[Claims] (1) The brightness signal and chrominance signal of a high-definition TV signal are recorded in separate recording channels at track pitches P1 and P2, respectively, and the MUSE signal of a satellite TV receiver that compresses the band of the high-definition TV signal is track pitch A video disk device configured to record on one recording channel in P1, wherein the transducer feed speed is set to the first feed speed when recording the luminance signal and the color signal, and the first feed speed when recording the MUSE signal. P1/(P1+P2) of the feed rate of
A video disc device characterized in that the speed is switched to a second feed speed that is twice as fast. (2) The brightness signal and chrominance signal of a high-definition TV signal are recorded in separate recording channels at track pitches P1 and P2, respectively, and the MUSE signal of a satellite TV receiver that compresses the band of the high-definition TV signal is track pitch A video disk device configured to record on one recording channel at P1, wherein the transducer feed speed is set to the first feed speed when recording the luminance signal and the color signal, and the MUSE
When recording the signal, the first feed speed is P1/(P1+P
2) Switch to the second feed rate, which is twice as fast as the above MU
The relative speed of the transducer and the disk and the FM carrier frequency when FM modulating each of the above signals are adjusted to the MUS so that the recording wavelengths of the SE signal and the luminance signal are approximately equal.
A video disc device characterized in that switching is made between recording an E signal and recording a luminance signal. (3) Claim 2, characterized in that the switch for switching between recording of the luminance signal and color signal and recording of the MUSE signal also switches the loop gain of the disk rotation servo system. video disc device.