JPH01243786A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To exactly record a television signal and to reproduce the picture of no distortion by writing the television signal based on a synchronizing signal separated from the television signal, and reading the television signal in synchronism with the synchronizing signal generated by a synchronous generator. CONSTITUTION:A separating synchronizing signal (b) extracted from an input television signal (a) by a synchronization separator 2, is inputted to a gate pulse generator 5 and a writing controller 4. The generator 5 outputs a gate signal (d) to a gate circuit 3 based on the separating synchronizing signal (b) and the controller 4 outputs a writing signal (f) synchronized to the gate signal (d), to a memory 6 based on the separating synchronizing signal (b) respectively. As a result, an A/D converting signal C is intermediently recorded to the memory 6 with the timing of the signal (f). When a reference synchronizing signal (g) is outputted by a synchronization generator 7 and a reading control signal (h) is generated by a reading controller 8, a memory reading signal (i) is read out of the memory 6 and outputted from a terminal 201 as a reproducing television signal (j).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television signal device, and more particularly to a time-lapse recording and reproducing device for recording and reproducing television signals without frames.

[Conventional technology]

Conventionally, this type of time-lapse recording and reproducing apparatus, as shown in FIG. Motor drive 608, motor 609, motor 609', tape 610, synchronous generator 611, switch 612, reproduction amplifier 613, and demodulator 614
It is made up of.

First, the operation when recording a signal on the tape 610 will be explained. An input television signal A as shown in FIG. 7 is input to the terminal 101, the modulator 601 modulates a predetermined carrier wave with this signal, and the modulated signal B is sent to the recording amplifier 604.
Output to. On the other hand, the sync separator 602 separates the sync signal included in the input television signal A, and separates the sync signal C.
The signal is output to the gate pulse generator 603 as a signal. Based on the separated synchronization signal C, the gate pulse generator 603 generates a gate signal for intermittently extracting only a necessary portion of the modulated signal B, and supplies it to the recording amplifier 604.

During recording, the switch 612 is connected to the (a) side, selects the separated synchronization signal C from the synchronization separator 602, and supplies it to the servo controller 605. Servo controller 605
At this time, it locks to the separated synchronization signal C and controls the rotation of the motor 609 and the motor 609' through the motor drive 608, and at the same time records the controller signal G on the tape 610 through the control head 607.

On the other hand, the recording amplifier 604 extracts the recording signal E to be recorded from the modulated signal B based on the gate signal from the gate pulse generator 603, and records it on the tape 610 through the video head 606.

By the way, when the motor 609 and the motor 609' are rotated at a constant speed and the recording signal E and the controller signal G are recorded on the tape 610, they are intermittent as shown in FIG. 7 (TA) which schematically shows the recording on the tape. This results in wasted tape. Therefore, the servo controller 605
moves the tape 610 intermittently and controls the motor drive 608 so that signals are recorded on the tape without any gaps as shown in (TB).

Next, reproduction of signals recorded in this manner will be explained. First, the switch 612 is connected to the (b) side, and the reference synchronization signal H from the synchronization generator 611 is supplied to the servo controller 605. Then, the servo controller 605 controls the motor 609 and the motor 609' through the motor drive 60B so that the reproduced controller signal G is locked to the reference synchronization signal H.

From the tape 610 thus controlled, the video head 60
6 is amplified by a reproduction amplifier 613 and supplied to a demodulator 614 as a reproduction signal l. The demodulator 614 demodulates the television signal from this signal and outputs it as a reproduced television signal J from the output terminal 201.

As described above, the input television signal A input to the terminal 101 is intermittently recorded on the tape 610, and the recorded input television signal A is reproduced to the terminal 201.
is output from.

Recording and reproducing devices that can perform this kind of frame-by-frame recording are called time-lapse VTRs and are installed in banks, supermarkets, etc.
Used for long-term recording of security television, etc. When a crime or other incident occurs, valuable investigation materials can be provided.

[Problem to be solved by the invention]

Incidentally, the above-described time-lapse recording/reproducing apparatus requires precise control to move or stop the tape in short time units (16.7 milliseconds or 33.3 milliseconds) corresponding to fields or frames. However, since this tape is driven by mechanical means such as a motor, there is a problem of inertia, and precise control is not easy. That is, it is difficult to regularly record television signals on a tape, resulting in distorted reproduced images.

Furthermore, when playing back recorded images, when the same frame is played back in succession, a specific position on the tape is continuously rubbed by the head, which causes wear and tear, causing damage to the valuable tape. .

The purpose of the present invention is to solve such problems, to be able to accurately record television signals and reproduce images without distortion, and to eliminate problems such as tape wear even when the same frame is continuously reproduced. The purpose of the present invention is to provide a time-lapse recording and reproducing device that is unique to the industry.

(Means for Solving the Problems) A recording and reproducing device of the present invention includes an A/D converter that converts an analog television signal into a digital signal and outputs the digital signal, and a synchronization signal that is separated from the television signal and output. a sync separator; a gate pulse generator that generates a gate pulse at the timing of a television signal corresponding to a predetermined sync signal based on the sync signal output from the sync separator; and a gate pulse from the gate pulse generator. is input, a gate circuit that passes the digital signal output from the A/D converter, and a write pulse at the timing of the television signal corresponding to a predetermined synchronization signal based on the synchronization signal output from the synchronization separator. A synchronous generator that generates a synchronous signal, a read controller that outputs a read pulse in synchronization with the synchronous signal generated by this synchronous generator, and when this write controller generates a write pulse. , a memory that captures and stores the digital signal output by the A/D converter, and outputs the stored digital signal when the read controller generates a read pulse, and converts the digital signal output by the memory into an analog signal. It is equipped with a D/A converter that performs the conversion, and a VTR controller that generates control pulses that are synchronized with the digital signals read from the memory based on the synchronization signal from the synchronization generator.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing a recording/reproducing apparatus according to the present invention. This device 20 includes an A/D converter 1, a synchronous separator 2
, gate circuit 3, write controller 4, gate pulse generator 5, memory 6, synchronous generator 7, read controller 8, D/A converter 9, VTR controller 1 in Narahi
Consists of 0.

Input television signal a input from input terminal 101
is supplied to the A/D converter 1 and the synchronous separator 2, and the A/D
The input television signal a converted into a digital signal by the converter l is sent to the gate circuit 3 as an A/D converted signal C, and the separated synchronization signal extracted from the input television signal a by the synchronization separator 2 is a gate pulse. They are input to the generator 5 and the write controller 4, respectively.

Based on the separated synchronizing signal 5, the gate pulse generator 5 outputs to the gate circuit 3 a gate signal d which becomes logic "1" during one frame (or one field) corresponding to a predetermined separated synchronizing signal. The gate circuit 3 receives this gate signal d
When inputted, the A/D conversion signal C is passed through and supplied to the memory 6 as the gate output signal e. Also, the write controller 4 uses the gate signal d based on the separated synchronization signal d.
A write control signal f synchronized with is generated and outputted to the memory 6 to cause the gate output signal e to be written into the memory 6.

Further, the synchronization generator 7 generates a reference synchronization signal g to drive the read controller 8 and the VTR controller 10. The read controller 8 generates a read control signal based on this reference synchronization signal g, reads out the gate output signal e stored in the memory 6, and outputs it as a memory read signal l. The D/A converter 9 converts this memory read signal i into an analog signal and outputs it from the terminal 201 as a reproduced television signal j. On the other hand, VTR
The controller 10 controls the VTR based on the reference synchronization signal g.
A TR control signal is generated and output to the VTR connected to this device through a terminal 301.

Next, the operation of this recording/reproducing apparatus will be explained using FIG. 4. First, signal recording is performed as follows. The input television signal a input from the input terminal 101 is A/
The input television signal a, which is supplied to the D converter 1 and the sync separator 2 and converted into a digital signal by the A/D converter 1, is sent to the gate circuit 3 as an A/D converted signal C, and then to the sync separator 2. The separated synchronizing signals extracted from the input television signal a are input to the gate pulse generator 5 and the write controller 4, respectively.

The gate pulse generator 5 outputs a gate signal d to the gate circuit 3 based on the separated synchronization signal S.

When the gate circuit 3 receives this gate signal d, the A/D
The converted signal is passed through and supplied to the memory 6 as the gate output signal e. Also, the write controller 4 uses a write control system synchronized with the gate signal d based on the separate synchronization signal d.
11 signal f is generated and output to the memory 6 to cause the gate output signal e to be written into the memory 6. As a result, A
The /D conversion conversion signal is extracted at the timing of the overwrite control signal f and is intermittently recorded in the memory 6.

The signal recorded in this way is reproduced as follows. When the synchronization generator 7 outputs the reference synchronization signal g and the read controller 8 generates a read control signal, the memory 6 reads and outputs the memory read signal i. The D/A converter 9 converts this signal into an analog signal and outputs it from the terminal 201 as a reproduced television signal j. At this time, the VTR controller 10 simultaneously
The R control signal is generated and output from the terminal 301.

When recording a signal on a VTR, as shown in Figure 2,
The TR 30 is connected to the rear stage of the recording/reproducing device 20, and the VTRTR control signal from the VTR controller 10 is transmitted to the VT.
Make R30 perform a recording operation. As a result, the reproduced television signal j is recorded on the tape of the VTR 30 as a VTR recording signal signal.

When reproducing signals from a VTR, the VT
R30 is connected to the front stage of the recording/reproducing device 20, and the VTR30
The VTR recording signal β recorded by is inputted to the recording/reproducing device 20 as a human-powered television signal a. The timing chart of each signal in this case is shown in FIG. 5. At this time, the gate signal d from the gate pulse generator 5 is always logic "1"
”, and the gate output signal e remains above the A/D conversion signal.
It is stored in the memory 6 as . By controlling the read address of the memory 6 by the read controller 8, various video reproductions are possible.

For example, as shown in (TA) in FIG.
, that is, if the read address is changed sequentially every 3 frames (or fields), 3
The same signal l is continuously output during frames, and the reproduced television signal j changes every three frames.

Furthermore, if the read address is constant as shown in (TB), the memory read signal i output from the memory 6 will be a signal of the same frame, and therefore the reproduced television signal j of one frame will be continuously transmitted to the terminal. It will be output from 201. In other words, by using this recording and reproducing apparatus 20, signals that could not be obtained by repeatedly reproducing the same location on the tape with conventional time-lapse recording and reproducing apparatuses can be obtained simply by controlling the read address.

〔Effect of the invention〕

As explained above, the recording and reproducing apparatus of the present invention includes: an A/D converter that converts an analog television signal into a digital signal and outputs the digital signal; a sync separator that separates and outputs a synchronization signal from the television signal; A gate pulse generator generates a gate pulse at the timing of a television signal corresponding to a predetermined synchronization signal based on the synchronization signal output by the synchronization separator, and when the gate pulse from this gate pulse generator is input. , a gate circuit that passes the digital signal output from the A/D converter, and a write controller that generates a write pulse at the timing of a television signal corresponding to a predetermined synchronization signal based on the synchronization signal output from the synchronization separator. , a synchronous generator that generates a synchronous signal, a read controller that outputs a read pulse in synchronization with the synchronous signal generated by this synchronous generator, and when this write controller generates a write pulse, A
a memory that captures and stores the digital signal output by the /D converter and outputs the stored digital signal when the read controller generates a read pulse;
It includes a D/A converter that converts digital signals output from the memory into analog signals, and a VTR controller that generates control pulses synchronized with the digital signals read from the memory based on the synchronization signal from the synchronization generator. There is.

Therefore, by connecting the recording and reproducing apparatus of the present invention to a normal VTR, it is possible to accurately record television signals and reproduce undisturbed images, and even when the same frame is continuously reproduced, problems such as tape wear occur. It is possible to realize a time-lapse recording/playback device that does not cause any lag.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG.
FIG. 3 is a block diagram showing a time-lapse recording and reproducing apparatus constructed using the embodiment shown in FIG. 1, and FIGS.
FIG. 6 is a block diagram showing a conventional time-lapse recording/reproducing apparatus; FIG. 7 is a timing chart showing the operation of the time-lapse recording/reproducing apparatus shown in FIG. 6. l...A/D converter 2...Sync separator 3...Gate circuit 4...Write controller 5...Gate pulse generator 6...Memory 7...Sync generator 8... ...Reading controller 9...D/A converter 10...VTR controller 20...Recording and reproducing device 30...VTR

Claims (1)

[Claims] (1) An A/D converter that converts an analog television signal into a digital signal and outputs it; a sync separator that separates and outputs a sync signal from the television signal; and a sync signal that the sync separator outputs. a gate pulse generator that generates a gate pulse at the timing of a television signal corresponding to a predetermined synchronization signal based on the sync signal, and an A/D converter that outputs an output when the gate pulse from this gate pulse generator is input. a gate circuit for passing a digital signal; a write controller that generates a write pulse at the timing of a television signal corresponding to a predetermined synchronization signal based on the synchronization signal output from the synchronization separator; and a synchronization generator that generates a synchronization signal. a read controller that outputs a read pulse in synchronization with the synchronization signal generated by the synchronization generator, and a read controller that captures the digital signal output by the A/D converter when the write controller generates a write pulse. A memory that stores and outputs the stored digital signal when the readout controller generates a readout pulse, a D/A converter that converts the digital signal output from the memory into an analog signal, and a digital signal that is read out from the memory. A recording/reproducing device comprising a VTR controller that generates control pulses synchronized with signals based on a synchronization signal from a synchronization generator.