JPH0622341A - Color picture signal reproducing device - Google Patents

Abstract

PURPOSE:To reproduce a color picture signal recorded on a recording disk medium corresponding to the different TV system in a state capable of being monitored with simple configuration. CONSTITUTION:Number of horizontal synchronizing signals in the reproduction of a video floppy compatible with the PAL system is 312.5, and when count data from a counter 18 indicate 310-315, an N/P discrimination circuit 19 discriminates the system to be the PAL system, and a control high level signal C is outputted to a motor servo circuit 5 and a chroma signal suppression circuit 15. The circuit 5 receives a signal (c) from the circuit 19 to control a motor 6 so that a number of revolutions of a video floppy 1 is 3600 or 3000rpm. Moreover, in the case that the system is compatible with the NTSC system, number of horizontal synchronizing signals is 262.5, and when data indicate 260-265, the circuit 19 discriminates the system to be the NTSC system and outputs a low level control signal (c) to the circuits 5, 19. Then the circuit 5 controls the motor 6 while the circuit receives the signal from the circuit 19 so that the floppy 1 keeps number of revolutions of the video floppy 1 being 3600rpm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image signal reproducing apparatus for reproducing a color image signal recorded on a disc-shaped recording medium.

[0002]

2. Description of the Related Art Conventionally, a video floppy in which a still image signal conforming to the NTSC television system is recorded and a video floppy in which a still image signal conforming to the PAL television system is recorded can be reproduced together. An NTSC / PAL combined playback device that can be used is being considered.

In the above-mentioned NTSC / PAL combined reproducing apparatus, a video floppy is usually driven by a motor at 3600r.
The RF signal reproduced from the video floppy by the magnetic head is phase-synchronized by the motor servo circuit so that it rotates at a constant speed of pm, and after being amplified by the amplifier, it becomes a still image signal by the demodulation circuit. Demodulated.

A horizontal sync signal is separated from the demodulated still image signal by a sync signal separation circuit, and the number of horizontal sync signals is counted by a counter.

The timing for starting the counting of the counter is one for each rotation of the video floppy by detecting the PG yoke provided on the center hub of the video floppy by the PG coil.
It is determined by the PG pulse generated from the PG coil.

Then, the count result of the counter is NT
If the value corresponds to the SC system, the motor is controlled by the motor servo circuit so that the video floppy rotates at 3600 rpm as it is. If the value corresponds to the PAL system, the video floppy rotates at 3000 rpm. The motor is controlled by the motor servo circuit.

Then, as described above, the rotation control of the video floppy is controlled so as to be compatible with the corresponding television system of the still image signal recorded on the video floppy, and then reproduced and demodulated from the video floppy. The processed still image signal is further processed in the signal processing circuit,
Is output.

[0008]

However, in the conventional reproducing apparatus as described above, the luminance signal included in the still image signal can be reproduced correctly even if the video floppy is compatible with NTSC or PAL. However, the color signal is reproduced correctly on a video floppy compatible with the NTSC system, but is not reproduced correctly on a video floppy compatible with the PAL system because the frequency of the subcarrier is different between the NTSC system and the PAL system. There is a drawback that color noise occurs and the reproduced image becomes difficult to see.

Further, even when the frequencies of the subcarriers are adjusted when reproducing a video floppy compatible with the PAL system, in the PAL television system, the phase of the subcarrier changes every horizontal synchronization period. Since complex circuits are required to form an accurate chroma signal,
The device becomes complicated.

The present invention is a color image signal reproducing apparatus capable of reproducing color image signals recorded on disk-shaped recording media corresponding to mutually different television systems with a simple structure and in an easily monitorable state. The purpose is to provide.

[0011]

A color image signal reproducing apparatus of the present invention comprises a reproducing means for rotating a disc-shaped recording medium to reproduce a color image signal recorded on the disc-shaped recording medium, and the reproducing means. The sync state detecting means for detecting the state of the sync signal contained in the color image signal reproduced by the reproducing means, and the rotation of the disk-shaped recording medium in the reproducing means according to the state of the sync signal detected by the sync state detecting means. It has a control means for controlling the operation and a color signal suppressing means for suppressing a color signal included in the color image signal reproduced by the reproducing means according to the state of the synchronization signal detected by the synchronization state detecting means. It is a thing.

[0012]

With the above arrangement, it is possible to reproduce the color image signals recorded on the disk-shaped recording media corresponding to the different television systems in a state where they can be easily monitored.

[0013]

EXAMPLES The present invention will be described below with reference to examples of the present invention.

FIG. 1 is a diagram showing a schematic configuration of a color image signal reproducing apparatus to which the present invention is applied as a first embodiment of the present invention.

In FIG. 1, 1 is a video floppy, 2
Is a PG yoke, which is a small metal piece provided on the center hub of the video floppy 1, 3 is a magnetic head,
4 is a PG coil, 5 is a motor servo circuit, 6 is a motor, 7 is a preamplifier, 8 is a luminance signal demodulation circuit, 9 is a luminance signal processing circuit, 10 is an adder for adding a luminance signal and a chroma signal, and 11 is Output terminal, 12 is a color signal demodulation circuit,
13 is a color signal processing circuit, 14 is an encoder, 15 is a chroma signal suppressing circuit, 16 is a PG pulse waveform shaping amplifier,
Reference numeral 17 is a sync signal separation circuit, 18 is a counter for counting the number of sync signals, 19 is a video floppy to be reproduced which corresponds to the NTSC system or the PAL system based on the counting result of the counter 18. Is an N / P discriminating circuit for discriminating whether or not

It is assumed that the reproducing apparatus shown in FIG. 1 is an apparatus based on the NTSC system. First, the operation when the reproducing apparatus reproduces a video floppy compatible with the PAL system will be described.

In FIG. 1, a video floppy 1 loaded in the apparatus is rotated at 3600 rpm by a motor 6 controlled by a motor servo circuit 5.

The motor servo circuit 5 shapes the signal generated by the PG coil 4 by the PG pulse waveform shaping amplifier 16 each time the PG yoke 2 of the video floppy 1 passes through the PG coil 4. As a result, the rotation phase of the motor 6 is controlled by using the PG pulse a shown in FIG. 2 which is generated at a rate of one every one rotation of the video floppy 1.

The PG pulse waveform shaping amplifier 16 is also provided.
The PG pulse a output from the counter 18 is the counter 18 described later.
Is also supplied.

Then, the RF signal reproduced from the video floppy 1 by the magnetic head 3 is amplified to a predetermined level by the preamplifier 7, and then, in the luminance signal demodulation circuit 8 and the chrominance signal demodulation circuit 9, respectively, the baseband luminance signal. And a baseband color signal.

The baseband luminance signal output from the luminance signal demodulation circuit 8 is subjected to signal processing such as de-emphasis processing and frequency characteristic correction processing in the luminance signal processing circuit 9, and then added to the chroma signal described later in the adder 10. Is added and output from the output terminal 11.

In the above state, the vertical synchronizing period of the synchronizing signal included in the reproduced and restored luminance signal is 1
Since the horizontal synchronizing period is 6.6 msec and the horizontal synchronizing period is 51.2 μsec, even if an image signal output from the output terminal 11 is supplied to a monitor device or the like for monitoring, the monitor device is not synchronized and the image is disturbed. I will end up.

The baseband luminance signal output from the luminance signal demodulating circuit 8 is also supplied to the synchronizing signal separating circuit 17, and the synchronizing signal is separated in the synchronizing signal separating circuit 17 and supplied to the counter 18. It

FIG. 2 is a timing chart showing the relationship between the synchronization signal b supplied to the counter 18 and the PG pulse a input as the reset signal of the counter 18.

The counter 18 is reset by the trailing edge of the PG pulse a, and the sync signal supplied from the sync signal separating circuit 17 during the period from time t1 to t2, that is, during the period in which the video floppy 1 makes one round, is detected. The number of horizontal synchronization signals is counted, and count data indicating the count result is supplied to the N / P determination circuit 19.

Since the video floppy corresponding to the PAL system is reproduced here, the number of horizontal synchronizing signals is "3".
12.5 ", and the count data supplied from the counter 18 is" 310-31 "in the N / P discrimination circuit 19.
If it indicates "5", it is determined that the video floppy currently being played is compatible with the PAL system, and a high-level control signal c is output to the motor servo circuit 5 and the chroma signal suppressing circuit 15.

The motor servo circuit 5 is connected to the N
A high-level control signal c from the / P discrimination circuit 19
Is input, the motor 6 is controlled so that the video floppy 1 rotating at 3600 rpm rotates at 3000 rpm.

As a result, the synchronizing signal included in the reproduced and restored luminance signal has a vertical synchronizing period of 20 msec and a horizontal synchronizing period of 64 μsec.

On the other hand, the baseband color signal output from the color signal demodulation circuit 12 is subjected to signal processing such as de-emphasis processing and line synchronization processing in the color signal processing circuit 13, and then input to the encoder 14. 3.58MHz
Are balanced-modulated using the subcarriers of and output as a chroma signal.

The chroma signal output from the encoder 14 is input to the chroma signal suppressing circuit 15, and the chroma signal suppressing circuit 15 is supplied with a high level control signal c from the N / P discriminating circuit 19. Therefore, the input chroma signal is suppressed by the chroma signal suppressing circuit 15 and is not supplied to the adder 10.

Therefore, the adder 10 outputs only the luminance signal including the synchronizing signal having the vertical synchronizing period of 20 msec and the horizontal synchronizing period of 64 μsec, which is supplied to the output terminal 11, and the output terminal 11 outputs the luminance signal. By supplying the output image signal to a monitor device or the like, it is possible to monitor an image without color noise or synchronization disturbance.
In the above state, the vertical synchronizing period of the synchronizing signal output from the synchronizing signal separation circuit 17 is 20 msec, but since the number of horizontal synchronizing signals existing in this vertical synchronizing period is "312.5", Since the value represented by the count data output from the counter 18 does not change, N
The control signal c output from the / P discrimination circuit 19 is maintained at a high level.

Next, the case of reproducing a video floppy compatible with the NTSC system will be described.

When reproducing a video floppy compatible with the NTSC system, the number of horizontal sync signals is "26".
If the count data indicates "260 to 265", the N / P discriminating circuit 19 determines that the video floppy currently being played corresponds to the NTSC system, and the motor servo A low-level control signal c is output to the circuit 5 and the chroma signal suppression circuit 15.

Then, the motor servo circuit 5 uses the N
A low-level control signal c from the / P discrimination circuit 19
The motor 6 is controlled so that the video floppy 1 rotates at 3600 rpm as it is during the input of.

On the other hand, the baseband color signal output from the color signal demodulation circuit 12 is subjected to signal processing such as de-emphasis processing and line synchronization processing in the color signal processing circuit 13, and then input to the encoder 14 and 3 Balanced modulation is performed using a subcarrier of 0.58 MHz, and is input to the chroma signal suppression circuit 15 as a chroma signal.

At this time, the control signal c supplied from the N / P discriminating circuit 19 to the chroma signal suppressing circuit 15 is at the low level, so the chroma signal suppressing circuit 1
5 does not operate, and the input chroma signal is supplied to the adder 10 as it is, added with the luminance signal, and output from the output terminal 11.

Therefore, the output terminal 11 is supplied with the luminance signal including the synchronizing signal having the vertical synchronizing period of 20 msec and the horizontal synchronizing period of 64 μsec, and the chroma signal, which is output from the output terminal 11. A color image can be monitored by supplying an image signal to a monitor device or the like.

FIG. 3 is a diagram showing a schematic structure of a color image signal reproducing apparatus to which the present invention is applied as a second embodiment of the present invention, and is the same as the reproducing apparatus shown in FIG. Reference numbers are attached and detailed explanations are omitted.

The reproducing device shown in FIG. 3 is assumed to be a device based on the PAL system. First, a case where the reproducing device reproduces a video floppy compatible with the NTSC system will be described.

In FIG. 3, the video floppy 1 loaded in the apparatus is rotated at 3000 rpm by the motor 6 controlled by the motor servo circuit 5.

The motor servo circuit 5 shapes the signal generated by the PG coil 4 by the PG pulse waveform shaping amplifier 16 each time the PG yoke 2 of the video floppy 1 passes through the PG coil 4. As a result, the rotation phase of the motor 6 is controlled using the PG pulse a shown in FIG. 2 which is generated at a rate of one every time the video floppy 1 makes one rotation.

The PG pulse waveform shaping amplifier 16 is also provided.
The PG pulse a output from the counter 18 is the counter 18 described later.
Is also supplied.

Then, the RF signal reproduced from the video floppy 1 by the magnetic head 3 is amplified to a predetermined level by the preamplifier 7, and then, in the luminance signal demodulation circuit 8 and the chrominance signal demodulation circuit 9, respectively, the baseband luminance signal. And a baseband color signal.

The baseband luminance signal output from the luminance signal demodulation circuit 8 is subjected to signal processing such as de-emphasis processing and frequency characteristic correction in the luminance signal processing circuit 9, and then added to a chroma signal described later in the adder 10. They are added and output from the output terminal 11.

In the above state, the vertical synchronizing period of the synchronizing signal included in the reproduced and restored luminance signal is 20.
Since the msec and the horizontal synchronization period are 76.2 μsec, even if an image signal output from the output terminal 11 is supplied to a monitor device or the like for monitoring, the monitor device is not synchronized and the image is disturbed.

The baseband luminance signal output from the luminance signal demodulating circuit 8 is also supplied to the synchronizing signal separating circuit 17, and the synchronizing signal is separated in the synchronizing signal separating circuit 17 and supplied to the counter 18. It

FIG. 2 is a timing chart showing the relationship between the synchronization signal b supplied to the counter 18 and the PG pulse a input as the reset signal of the counter 18.

The counter 18 is reset by the trailing edge of the PG pulse a, and in the synchronizing signal supplied from the synchronizing signal separating circuit 17 during the period from time t1 to t2, that is, during the period in which the video floppy 1 makes one round. The number of horizontal synchronization signals is counted, and count data indicating the count result is supplied to the N / P determination circuit 19.

Since a video floppy compatible with the NTSC system is reproduced here, the number of horizontal synchronizing signals is "
262.5 ", and the count data supplied from the counter 18 in the N / P discrimination circuit 19 is" 260-2.
If it indicates 65 ", it is determined that the video floppy currently being played is compatible with the NTSC system, and a low level control signal c is output to the motor servo circuit 5 and the chroma signal suppressing circuit 15.

Then, the motor servo circuit 5 uses the N
A low-level control signal c from the / P discrimination circuit 19
Is input, the motor 6 is controlled so that the video floppy 1 rotating at 3000 rpm rotates at 3600 rpm.

As a result, the vertical synchronizing period of the synchronizing signal included in the reproduced and restored luminance signal is 16.6 msec,
The horizontal synchronization period is 63.5 μsec.

On the other hand, the baseband color signal output from the color signal demodulation circuit 12 is subjected to signal processing such as de-emphasis processing and line synchronization processing in the color signal processing circuit 13 and then input to the encoder 14. 4.43 MH
It is balanced-modulated using the z subcarrier and output as a chroma signal.

The chroma signal output from the encoder 14 is input to the chroma signal suppressing circuit 15. In the chroma signal suppressing circuit 15, the low level control signal c from the N / P discriminating circuit 19 is supplied from the inverter 20. The chroma signal that has been inverted and supplied as the high-level control signal c is suppressed by the chroma signal suppression circuit 15, and is not supplied to the adder 10.

Therefore, the adder 10 outputs only the luminance signal including the synchronizing signal having the vertical synchronizing period of 16.6 msec and the horizontal synchronizing period of 63.5 μsec, and is supplied to the output terminal 11. By supplying the image signal output from the output terminal 11 to a monitor device,
It is possible to monitor images without color noise or disturbance in synchronization.

In the above state, the vertical synchronizing period of the synchronizing signal output from the synchronizing signal separation circuit 17 is 16.6.
Although it is msec, since the number of horizontal synchronizing signals existing in this vertical synchronizing period is "262.5", the value represented by the count data output from the counter 18 does not change, so the N / P discrimination circuit 19 The control signal c output from the device maintains a low level.

Next, the case of reproducing a video floppy compatible with the PAL system will be described.

When reproducing a video floppy compatible with the PAL system, the number of horizontal synchronizing signals is "312.
5 ", and the count data of the N / P discrimination circuit 19 is"
310-315 ", it is determined that the video floppy currently being played is compatible with the PAL system, and a high-level control signal c is output to the motor servo circuit 5 and the chroma signal suppression circuit 15. To do.

Then, the motor servo circuit 5 uses the N
A high-level control signal c from the / P discrimination circuit 19
The motor 6 is controlled so that the video floppy 1 rotates at 3000 rpm as it is during the input of.

On the other hand, the baseband color signal output from the color signal demodulation circuit 12 is subjected to signal processing such as de-emphasis processing and line-sequential processing in the color signal processing circuit 13, and then input to the encoder 14 and 4 Balanced modulation is performed using the .43 MHz subcarrier, and is input to the chroma signal suppression circuit 15 as a chroma signal.

At this time, the control signal c supplied from the N / P discriminating circuit 19 to the chroma signal suppressing circuit 15 is inverted by the inverter 20 and is at a low level. The input chroma signal does not operate and is supplied to the adder 10 as it is, added to the luminance signal, and output from the output terminal 11.

Therefore, the output terminal 11 is supplied with the luminance signal including the synchronizing signal having the vertical synchronizing period of 20 msec and the horizontal synchronizing period of 76.2 msec, and the chroma signal, and is output from the output terminal 11. A color image can be monitored by supplying the generated image signal to a monitor device or the like.

As described above, in the reproducing apparatus based on the NTSC television system or the PAL television system, the number of horizontal synchronizing signals contained in the image signal reproduced from the video floppy is counted, and the count value is counted. In accordance with the control of the rotation operation of the video floppy that is controlled by the motor servo circuit in accordance with the control, whether the color signal is suppressed or not is controlled. When monitoring a color image signal recorded on a floppy disk with a monitor device, etc., it is possible to monitor a color image without synchronization disturbance, and monitor a color image signal recorded on an unsupported video floppy disk. In some cases, monitor images that are easy to see without color noise or disturbance in synchronization. It becomes as can be over.

[0063]

As described above, according to the present invention, color image signals recorded on disk-shaped recording media corresponding to different television systems can be easily monitored with a simple structure. A color image signal reproducing device capable of reproducing can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a color image signal reproducing apparatus to which the present invention has been applied, as a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining the operation of the color image signal reproducing device shown in FIG.

FIG. 3 is a diagram showing a schematic configuration of a color image signal reproducing apparatus to which the present invention has been applied, as a second embodiment of the present invention.

[Explanation of symbols]

 1 Video Floppy 2 PG Yoke 3 Magnetic Head 4 PG Coil 5 Motor Servo Circuit 6 Motor 7 Preamplifier 8 Luminance Signal Demodulation Circuit 9 Luminance Signal Processing Circuit 10 Adder 11 Output Terminal 12 Color Signal Demodulation Circuit 13 Color Signal Processing Circuit 14 Encoder 15 Chroma Signal suppression circuit 16 PG pulse waveform shaping amplifier 17 Sync signal separation circuit 18 Counter 19 N / P discrimination circuit 20 Inverter

Claims (1)

[Claims] 1. A reproducing unit for rotating a disc-shaped recording medium to reproduce a color image signal recorded on the disc-shaped recording medium, and a state of a sync signal included in the color image signal reproduced by the reproducing unit. A synchronization state detecting means for detecting the rotation state, a control means for controlling the rotating operation of the disk-shaped recording medium in the reproducing means according to the state of the synchronization signal detected by the synchronization state detecting means, and the synchronization state detecting means A color image signal reproducing device comprising: a color signal suppressing unit that suppresses a color signal included in the color image signal reproduced by the reproducing unit according to a state of the detected synchronization signal.