JPH01103079A - Picture signal reproducing device - Google Patents

Abstract

PURPOSE:To quickly output normal reproduced picture even in a magnetic sheet where recording systems exist in mixture by discriminating and storing the system of a signal recorded in a short period of time when a magnetic sheet is loaded till initial setting is applied. CONSTITUTION:While the initial setting is applied after the magnetic sheet 8 is loaded to a picture signal reproducing device, the device is fixed in the NTSC system mode (can be CCIR system mode). A synchronizing signal is separated (14) from the reproduced luminance signal and the synchronizing signal is given to a turning circuit 15 tuned to the horizontal frequency FM outputted when the recorded track recorded by the CCIR system is reproduced by the NTSC system and depending on the state of the output signal of the tuning circuit 15, by which system the recording track is recorded is discriminated M within the time till the end of initial setting. Thus, the video signal recorded by both the systems stably at high speed is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image signal reproducing device that reproduces an image signal recorded on a recording medium through a head.

[Prior Art] FIG. 6 shows a schematic configuration example of a conventional still image signal recording and reproducing apparatus.

As shown in this figure, the luminance signal input to the luminance signal input terminal 1 is clamped by the clamp circuit 2 to a sync tip, for example, at a constant DC potential at the tip of the synchronization signal.
The emphasis circuit 3 performs pre-emphasis to enhance high frequencies, the FM modulator 4 performs FM modulation, the signal passes through a recording amplifier 5 and a recording/playback switch 6, and is then sent to a disc-shaped signal via a magnetic head 7. ) is recorded on the magnetic sheet 8 as static brightness information. At this time, the magnetic sheet 8 is rotated at the field period of the luminance signal by the sheet motor 9 controlled by the motor servo circuit 91, so that - the luminance signal for one field is recorded on the circumferential recording track. become. Further, since the magnetic head 7 is movable in the radial direction by a head moving mechanism 71 constituted by, for example, a stepping motor, the magnetic head 7 can be moved in the outermost track a and the innermost track b, as shown in FIG.
During this time, for example, a total of 50 concentric recording tracks are formed.

During reproduction, the magnetic sheet 8 is rotated at the field period of the luminance signal in the same way as during recording, and the minute reproduction information output from the magnetic head 7 is transmitted through a switch 6 to a preamplifier 10. amplified to a level that
The signal is FM demodulated by an FM demodulator 11, and is output as a reproduced still image signal to a reproduced video signal output terminal 13 via a de-emphasis circuit 12 having characteristics opposite to those of the above-mentioned emphasis circuit 3.

[Problems to be Solved by the Invention] In general, scanning line systems for television signals can be broadly divided into two systems. One method is NTS
C method, field frequency Ft±59.94Hz,
The horizontal frequency Fs = 15.734kHz, and the other system is the PAL system (hereinafter referred to as CCIR system) adopted by CCIR, and the field frequency F, =
50 Hz, horizontal frequency F, = 15.625 kHz. Currently, still image signal recording and reproducing devices as shown in Figure 6 above are compatible with the NTSC system, but of course there are countries that use the CCIR system for still images. However, the CCIR method has more scanning lines (NTSC method has 5251 ines,
(:(:IR method is 625 tines), so CC
Since the IR method is considered suitable for recording still images, it is expected that still image recording and reproducing devices using the CCIR method will become extremely important in the future.

In this case, it is advantageous to use an existing magnetic sheet 8, so there is a high possibility that magnetic sheets of the same standard will be used for both systems, but at the same time, there will be two scanning line systems in the same magnetic sheet. It is possible that the video signal will be recorded. In addition, there are already television receivers that are compatible with both the NTSC system and the CCIR system, and therefore even in still image signal recording and reproducing devices, it is possible to automatically and quickly select between both systems from the reproduction information from the magnetic sheet. There is a strong demand for the development of an image signal reproducing device that can detect which method is used and reproduce the reproducing circuit state by switching to a reproducing circuit state suitable for each method.

In view of the above-mentioned points, the present invention automatically detects either the NTSC system or the CCIR system from the reproduction information from the recording medium at high speed, and reproduces the video signal suitable for each system. The object of the present invention is to provide an image signal reproducing device that enables the reproduction of image signals.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an apparatus that uses a recording medium capable of recording a plurality of image signals with different signal processing systems, and a device that uses a recording medium capable of recording a plurality of image signals with different signal processing systems. a reproduction means for reproducing image information recorded on a recording medium in a state set to one of the processing methods; and an extraction means for extracting a signal component related to the synchronization signal from the image signal reproduced by the reproduction means. , a determining means for determining whether or not the extracted signal component is a signal corresponding to a set signal processing system.

[Function] The present invention provides: (1) After inserting a magnetic sheet into an image signal reproducing device,
Until the initial settings, the device is set to NTSC mode (C
(2) Separate the synchronization signal from the reproduced luminance signal, and use this synchronization signal as the horizontal frequency FM that is output when a track recorded in the CCIR method is played back in the NTSC method. The input signal is input to a tuning circuit that is tuned to Video signals recorded with both methods can be played back stably and at high speed.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a schematic circuit configuration of a still image signal recording and reproducing apparatus to which the present invention is applied. To explain what is different from the above-mentioned FIG. 6, the synchronization signal is separated from the reproduced luminance signal which is the output of the de-emphasis circuit 12 during reproduction by the synchronization signal separation circuit 14, and then the synchronization signal is transmitted to the tuning circuit 15. supply to.

The tuning frequency of the tuning circuit 15 is, for example, the CCIR horizontal synchronization frequency FH=59.9 of 15.625kllz.
It is tuned to 4750 times the frequency FM C~18.73k)12).

The reason for this is, for example, when initializing the CP
This is because the mode is forcibly fixed to NTSC 1,000-code by U17, and it is set to tune to the CCIR system reproduction signal. That is, when the device M is operated in the NTSC mode, the motor 9 for rotating the disk receives the NTSC vertical synchronization signal (59) by the motor servo circuit 91.
,94)! A servo is applied so that it rotates in synchronization with Z). In this state, if the signal reproduced by the head 7 is a signal recorded using the CCIR method, the vertical synchronization signal frequency is read out in synchronization with 59.94Hx, which is higher than the normal 50Hz, and the horizontal synchronization signal The frequency of is normal 1
It will be reproduced at 59.94750 times the frequency of 5.625kHz. Therefore, the played track is CCr
If R, the horizontal synchronization signal separated by the synchronization separation circuit 14 resonates with the tuning frequency of the tuning circuit 15,
A sine waveform is output as shown in FIG. 2(a). On the other hand, if the reproduced recording track is a signal recorded in the NTSC system, the frequency of the synchronization-separated synchronization signal is 15.734kHz, so it does not resonate with the tuning frequency of the tuning circuit 15, and as shown in FIG. Tuning circuit 1 as shown in (b)
5 output hardly appears.

As a result, an output waveform is obtained only when the image signal recorded on a track on the disk is of the CCIR system, and it is possible to determine whether the image signal is of the NTSC or CCIR system.

The signal output from the tuning circuit 15 is transmitted to the waveform shaping circuit 16.
The signal is shaped into an F epulse signal via the CPII (Central Processing Unit) 17. N from CPU17
A discrimination signal that becomes high level when a reproduced luminance signal of the TSC method is outputted to the discrimination output terminal 18.

In this embodiment, the NTSC mode is fixed at the time of initialization, and the tuning circuit 15 is set to (59.941
Although it is set to tune to a horizontal synchronization signal that has been increased 50 times, it is of course also possible to initialize in CCIR mode and tune the tuning circuit 15 to a horizontal synchronization signal recorded in NTSC mode. It is. However, when playing an NTSC signal in CCIR mode, the frequency of the horizontal sync signal is 50759.9.
It decreases by 4 times. Therefore, since the tuning frequency of the tuning circuit 15 becomes low, the components of the resonant circuit become large-sized, and the former configuration is advantageous when there is not enough space for the components.

In addition, in the CCIR method, the rotation speed of the magnetic sheet 8 is approximately 20% slower than in the NTSC method.
Since the frequency characteristics of the electromagnetic conversion system deteriorate, the carrier frequency of the FM signal must be lower than that of the NTSC system. At the same time, the frequency deviation width may also be changed. In addition, it is common to change the emphasis characteristics in both types. For this reason, the recording system emphasis circuit 3, the FM modulator 4, and the reproduction system de-emphasis circuit 12 are each controlled according to each mode by a system discrimination signal M output from a terminal 18 of the CPU 17.

FIG. 3 shows an example of the circuit configuration of a motor servo circuit 92 that controls the rotation of the seat motor 9 that is compatible with both the NTSC system and the C11t system. Example seat motor 9
Since this is a DC motor, the servo system of this servo circuit consists of a speed servo and a phase servo.

First, to explain the speed servo, FG input terminal 2
7 is an F output from motor 9 at several tens of cycles per rotation.
A G signal is input manually, and this FG signal is waveform-shaped by an FG amplifier (FG amplifier) 28 to become a pulse signal as shown by waveform a in FIG. This FG pulse signal a is converted into a trapezoidal wave signal by the slope generation circuit 30 as shown in FIG. On the other hand, the output of the FG amplifier 28 is branched, passes through a mono-multivibrator 29 and a sample pulse generation circuit 31, becomes a sample pulse as shown by waveform C in FIG.

The delay time T1 of the sample pulse C is determined by the time constant formed by the resistors R1 and R2 of the mono multivibrator 29 and the capacitor C1. The rotation speed control signal output from the sample hold circuit 32 is sent to the motor drive circuit 33.
, and is output from the terminal 34 to drive and control the rotation of the seat motor 9.

In order to increase the rotation speed, the sample and hold position can be set to a high position to increase the level of the output voltage, so as is clear from the figure, the delay time T of the mono multivibrator 29 can be decreased.

Therefore, when recording and reproducing the NTSC system, the terminal 1 mentioned above is
Switch 26 is turned on by the method discrimination signal output from 8.
, the delay time T1 is set by resistor R2 and capacitor CI.
Determine the rotation speed of motor 9 to 59.94.
Set to Hz. On the other hand, when recording/reproducing the CCIR method, the switch 26 is turned OFF according to the method discrimination signal M, and the delay time T1 is determined by the time constant of the resistance value R1+R2 of the resistor R1%R2 and the capacitor value CI. Set the rotation speed to 50Hz.

Next, to explain the phase servo, PG input terminal 2
2, one PG pulse is generated per one rotation of the magnetic sheet 8 from the PG magnet and PG coil attached to the center core of the magnetic sheet 8, as shown in FIG. 7C.

This PG pulse is waveform-shaped by a PG amplifier (PG amplifier) 23, and a PG pulse as shown by waveform d in FIG. 4 is output. In the case of FIG. 4, the trailing edge is set to the PG pulse phase. This PG pulse d is generated by the slope generation circuit 2.
4, it becomes a trapezoidal wave as shown in waveform e in FIG.

On the other hand, the reference signal of the servo circuit is input to the reference signal input terminal 19. As this reference signal, a vertical synchronization signal (VSYNC) separated from the luminance signal is used at terminal 19 during recording.
During reproduction, a field periodic pulse as shown in waveform f in FIG. 4, generated by a synchronizing signal generating circuit (not shown), is input to the terminal 19. Since this field periodic pulse has a different period between the NTSC system and the CCrR system, it is created by switching a crystal oscillator (not shown) or the like. This field periodic pulse signal passes through the mono-multivibrator 20 and the sample pulse generation circuit 21, becomes a sampling pulse as shown by waveform g in FIG. 4, and is input to the sample hold circuit 25.

The mono multivibrator 20 transmits the human reference signal f over a period of time T.
This is to output a sample pulse delayed by 2 to shift the relationship between the PG pulse d and the reference signal f by a time T3, and the sample hold point of this sample pulse is set near the center of the slope of the trapezoidal wave e. is common. Also, the delay time T is the recording timing,
- Numerically set it to about 7H (H is horizontal period).

The phase control signal output from the sample and hold circuit 25 is input to the above-mentioned mono-multivibrator 29 which controls the speed via a resistor R3. Now, if the phase of the PG pulse advances (that is, if the rotation speed of the magnetic sheet 8 increases), the sample hold circuit 2
The output level of the magnetic sheet 8 is decreased, and the delay time T by the mono-multivibrator 29 is increased to reduce the rotational speed of the magnetic sheet 8 to bring it to a normal rotational phase (that is, an accurate rotational speed).

Next, with reference to the flowchart in FIG. 5, C in FIG.
The control operation procedure of the PU 17 will be explained.

The magnetic head 7 is moved 8 in the radial direction of the magnetic sheet 8 by a head movement mechanism 71 including a stepping motor (not shown).
The position of the magnetic head including the ON rack can be determined by the number of steps of the stepping motor. Therefore, first, one track pitch is sent in, for example, 12 steps. At this time, the feed time for one step is IIIS.
3 ms, and the feed rate from the 50th track to the 1st track is about 2 seconds. The method determination time is 0N) - 2 steps between the racks (approximately 6 ms), and the CCI
In a track recorded using the R method, approximately 112 pulses of 1M pulse are generated within this time, so NTSC
There is no particular problem in distinguishing from the method. Further, NccIR in step 511 in the flowchart of FIG.
This is the minimum count number in the CIR method, and is preferably set to about 40, for example.

To explain the flowchart of FIG. 5, first, a so-called initialization operation is started by loading a magnetic sheet, and the recording head 7 is moved to the position of the 51st track on the inner circumference side (step Sl).

S2), furthermore, the NTSC mode is forcibly set (step S3), and the internal FM detection pulse counter that counts 1M pulses input from the waveform shaping circuit 16 is reset (step S4). next,
While moving the recording head 7 toward the outer circumference every l steps (
Step S5), in the step before the ON track (step 56), start the operation of the F detection pulse counter (step S7), and then at the next step of the ON track (step S8), F.
The count value of the M detection pulse counter is held as the output latch value N (step 59), and the FM detection pulse counter is reset (step 510).

Next, the above F. Detection pulse counter output latch value N
and NCCIR, which is the lowest count number in the CCIR method, and if N≧NCCIR, set the track condition flag to 0 indicating that the CCIR method is used, and set NCCIR.
<In the case of NCCIR, set the track condition flag to 1 indicating the NTSC system. Next, the first
Step 513) repeating the processes from steps 55 to 512 described above until the track+1 step is completed.
, when the first track +1 step is reached, the recording head 7 is set on the first track and the main discrimination process is completed (step 514).

The above-mentioned operation is performed during the initialization operation that starts when the magnetic sheet is loaded, and is performed simultaneously with the determination of empty tracks and recorded tracks on the magnetic sheet. Therefore, at the end of initialization, the above-mentioned system determination sequence is also performed. It's finished. Furthermore, since the image is muted during this initialization, it goes without saying that any disturbances in the image during the method determination will not be reproduced.

[Effects of the Invention] As explained above, according to the present invention, by forcibly fixing the system to either the NTSC system or the CCIR system during system discrimination, the initial system after the magnetic sheet is inserted is By reliably determining the signal format recorded on all tracks within a short period of time until the setting is made, and storing the determination result in the internal memory of the CPU, for example, this determination result can be used during playback. By using this method, it is possible to quickly output a normal reproduced image corresponding to each recording method even when using a magnetic sheet with a mixture of recording methods.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a schematic circuit configuration of an embodiment of the present invention, Fig. 2 is a waveform diagram showing an example of the output waveform of the tuning circuit used to discriminate the method shown in Fig. 1, and Fig. 3 is an NTSC method and a CCIR method. A block diagram showing an example of the circuit configuration of a servo circuit for driving a seat motor that is compatible with both types, Figure 4 is a timing chart showing the output timing of the signal of the servo circuit in Figure 3, and Figure 5 shows the CPU in Figure 1. FIG. 6 is a block diagram showing an example of the circuit configuration of a conventional still image signal recording/reproducing device; FIG. 7 is a plan view showing a schematic configuration of an internal magnetic sheet. It is a diagram. 6... Switch - 7... Magnetic head, 8... tnn receipt 9... Seat motor, lO... Preamplifier, 11... FM demodulator, 12... De-emphasis circuit, 14. ... Synchronization signal separation circuit, 15 ... Tuning circuit, 16 ... Waveform shaping circuit, 17 ... CPU. Paternal upper row 0, 1' man and a half 1' separate 1':, \) Nezuhubushi 2E type o 21 log of dissimilar circuit Figure 3: Block diagram of the round trip H' rotation Figure 4: Timing chart of one cycle of round 3 day R rotation

Claims (4)

[Claims] (1) A device using a recording medium capable of recording a plurality of image signals with different signal processing methods, wherein the signal processing system is set to one of the plurality of signal processing methods, and the recording medium is recorded on the recording medium with the signal processing system set to one of the plurality of signal processing methods. a reproduction means for reproducing recorded image information; an extraction means for extracting a signal component related to a synchronization signal from the image signal reproduced by the reproduction means; and a signal processing system in which the extracted signal component is set. 1. An image signal reproducing device comprising: a determining means for determining whether the signal corresponds to the above. (2) In claim (1), mode fixing means fixes the signal processing system to one of the plurality of schemes during initial settings after the recording medium is set in the apparatus. An image signal reproducing apparatus, characterized in that the mode fixing means is configured to be operated prior to the operation of the reproducing means, the extracting means, and the determining means. (3) In claim (1), the signal component related to the extracted synchronization signal is a horizontal synchronization signal, and the determining means is a signal processing method other than a signal processing method in the set signal processing system. By detecting the signal pattern when reproducing the horizontal synchronization signal using the signal processing method of
An image signal reproducing device characterized in that it is configured to detect the presence of recorded information that is made to correspond to the signal processing system. (4) In claim (1) or (3), the signal processing system is provided with a signal processing system corresponding to each of the plurality of signal processing methods, and the signal processing system is selected according to the output of the discrimination means. An image signal recording device characterized by comprising a sorting means.