KR100298946B1 - Device for automatically controlling slow screen of vcr and method therefor - Google Patents

Abstract

PURPOSE: A device for automatically controlling a slow screen of a VCR is provided to monitor a status of the slow screen of the VCR, and to automatically search an optimum state of the slow screen when the status of the slow screen deteriorates, so as to efficiently control the slow screen. CONSTITUTION: A micro computer(1) controls entire operations. A seek mode detector(2) and a monitor mode detector(3) inform the micro computer(1) of whether a mode is a seek mode or a monitor mode in a slow mode. The first memory(4) stores an initial slow tracking value. The second memory(5) stores an optimum slow tracking value. A pre-amplifier(6) amplifies a video signal to output the amplified video signal. An envelope detector(7) extracts an envelope of the output signal of the pre-amplifier(6). An A/D converter(8) converts an output signal of the envelope detector(7) into a digital signal to output the digital signal. A delay signal generator(9) generates a time delay signal. The third to the fifth memories(10-12) store digital values of the A/D converter(8). The first comparator(13) compares the stored digital values, and outputs result values. The sixth memory(14) stores a value stored in the third memory(10). The second and the third comparators(15, 16) compare the stored value of the sixth memory(14) with the stored value of the third memory(10), and output a result value. A servo system(17) drives a motor by a control signal of the micro computer(1). A transport(18) is transported by a signal output from the servo system(17).

Description

V's slow screen automatic adjusting device and method

The present invention relates to a slow screen automatic adjustment device and method of VCR (VCR), in particular to monitor the state of the slow screen in the V-Cal to slow down the slow screen state to automatically search for the optimal slow screen state to adjust the screen It relates to a slow screen automatic adjustment device and method of a V-Cal.

Conventionally, the slow screen adjusting apparatus of VCR has a keyboard 10, a microcomputer 20 for controlling the overall operation of the apparatus, and a control signal output from the microcomputer 20. As shown in FIG. The servo system 30 is configured to drive a motor according to the present invention, and a traveling system 40 that runs in accordance with a signal output from the servo system 30.

When the slow screen automatic adjustment device and method of the VCR configured as described above are described in detail with reference to FIGS. 1 and 2, the user presses the slow mode key to watch the slow screen and displays the slow screen of the VCR. When noise occurs on the screen while watching, the user presses a tracking button (TRK (+) (-)) of the keyboard 10.

That is, the microcomputer 20 determines whether it is a slow mode (S ₁ ) and performs an operation according to the non-slow mode (S ₂ ), and when the slow mode is a tracking (TRK (+)) command of the keyboard 10. (S ₃ ) is added to the reference tracking value by "1" and outputs to the servo system 30 (S ₄ ), and if it is not a tracking (TRK (+)) command, it is determined whether it is a tracking (TRK (-)) command. (S ₅ ) and the tracking (TRK (-)) command outputs the value obtained by subtracting "1" from the reference tracking value to the servo system 30.

Accordingly, the servo system 30 controls the traveling system 40 to drive the video track of the video tape to a position corresponding to the slow tracking value of which the head is changed according to the signal output from the microcomputer 20.

However, in the conventional VCR slow screen automatic adjustment device and method, when the user adjusts the screen by pressing the tracking button on the keyboard while watching the screen one by one and presses the tracking button again when the tape currently being watched is replaced. There was an inconvenience to adjust the screen.

Accordingly, an object of the present invention is to automatically adjust the screen by automatically searching for the optimal state of the slow screen in V-Cal and monitor the slow screen state, and then automatically search for the optimal state again and adjust the screen when the slow screen state worsens. It is to provide a slow screen automatic adjustment device and method of VCR (VCR).

Technical means of the present invention for achieving the above object, the first step of determining whether the optimum slow tracking value on the basis of the sampled digital value in the search mode of the slow mode; A second step of automatically adjusting tracking by adding or subtracting '1' to the current tracking value when it is not the optimal slow tracking value in the first step; A third step of determining whether the optimal slow tracking value is determined based on the digital value sampled after the adjustment in the second step, storing the tracking value if the optimal slow tracking value is set, and setting it to a monitoring mode; And determining whether the search mode is in the rescanning mode in the monitoring mode instead of the searching mode in the first step. With a device.

1 is a slow screen adjusting device of a conventional V-Cell,

2 is a slow screen adjustment method of FIG.

3 is a slow screen automatic adjustment device of V-C in accordance with an embodiment of the present invention.

(A) to (d) of FIG. 4 are waveform diagrams showing respective sub-waveforms of FIG.

5 is a slow screen automatic adjustment method of FIG.

6 is a detailed flowchart of FIG.

<Description of the symbols for the main parts of the drawings>

4, 5: first and second memory sections 6: preamplification section

7: Envelope detection part 10, 11, 12: 3rd, 4th and 5th memory

13: first comparator 14: 6th memory

15, 16: second and third comparison unit

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a slow screen automatic adjustment apparatus for VCR according to the present invention, which includes a microcomputer 1 for controlling the operation of the entire apparatus, and a search mode detection unit for notifying the microcomputer of the search mode or the monitoring mode in slow mode ( 2) and the monitoring mode detection unit 3, the first memory unit 4 for storing the initial slow tracking value, the second memory unit 5 for storing the optimal slow tracking value, and the head H. A preamplifier 6 for amplifying and reading the read video signal to a predetermined level, an envelope detector 7 for extracting an envelope of the signal output from the preamplifier, and a signal output from the envelope detector. An A / D converter 8 for high-conversion and output, a delay signal generator 9 for generating a time delay signal by the signal output from the microcomputer, and an A / D converter according to the signal output from the microcomputer. To store each of the output digital values A third comparator 13 for comparing the values stored in the third, fourth, and fifth memory parts 10 to 12 with the values stored in the third, fourth, fifth, and memory parts, and outputting the resultant values; The sixth memory unit 14 storing the value stored in the memory unit, and the second and third comparison unit 15 comparing the value stored in the sixth memory unit with the value stored in the third memory unit and outputting the resultant value. 16), a servo system 17 for driving a motor in accordance with a control signal output from the microcomputer 1, and a traveling system 18 for driving in accordance with a signal output from the servo system 17. do.

The operation and effects of the present invention configured as described above will be described in detail with reference to FIGS. 3 to 6 when the user presses the slow mode key on the keyboard to watch the slow screen. After recognizing the mode (S ₁ ), it is determined whether the search mode is used (S ₂ ), and the initial slow tracking value is stored in the first memory unit 4 in the search mode (S _2a ).

The stored slow tracking value is applied to the traveling system 18 through the servo system 17, and thus the traveling system 18 causes the video head to drive the tape according to the applied slow tracking value.

Accordingly, the high frequency (RF) sampling signal read from the video head is amplified to a predetermined level through the preamplifier 6 and then converted into a digital value through the envelope detector 7 and the A / D converter 8. .

Accordingly, the microcomputer 1 applies the data value for the time delay to the delay signal generator 9 and, through the delay signal generator 9, delays the time by T ₁ , T ₂ , and T ₃ as shown in FIG. 4. The control signal is output to the third, fourth, and fifth memory units 10, 11, 12 when there is an error.

Accordingly, the third, fourth, and fifth memory units 10, 11, and 12 store the sampled values after delaying T ₁ , T ₂ , and T ₃ according to the control signal output from the microcomputer ₁ , respectively. (S ₃ )

Thereafter, the microcomputer 1 determines whether the optimal slow tracking value is the optimal slow tracking value according to the comparison result output from the first and second comparators 13 and 15 (S ₄ ), and if the optimal tracking speed is not the optimal slow tracking value. adding "1" to the value of the output (S _5), and is optimal when the slow tracking value of the tracking value to the second memory section 5, the output (S ₇₎ and set to monitor mode (S _8).

On the other hand, if the determination (S ₂ ) result is not in the search mode, the microcomputer 1 determines whether it is the monitoring mode (S ₉ ) and outputs the current slow tracking value (S ₁₀ ) if it is not the monitoring mode, and in the monitoring mode. In the rescanning state (S ₁₁ ), if the rescanning state is set, the search mode is set (12) to perform the above search operation again. If the noise occurs in the slow mode by re-execution, the automatic tracking is performed in the same manner as described above.

Therefore, in the present invention, as described above, the optimum state of the slow screen is automatically found, and if the noise or the like is observed that the state of the slow screen is generated, the optimum screen state is again found.

Claims (2)

A first step of determining whether the optimal slow tracking value is based on the sampled digital value in the slow mode; A second step of automatically adjusting tracking by adding or subtracting '1' to the current tracking value when it is not the optimal slow tracking value in the first step; A third step of determining whether the optimal slow tracking value is determined based on the digital value sampled after the adjustment in the second step, storing the tracking value if the optimal slow tracking value is set, and setting it to a monitoring mode; And in the monitoring mode instead of the searching mode in the first step, determining whether the rescanning state is performed, and when the rescanning state is set, performing the fourth step of resetting from the second step after setting to the searching mode. How to automatically adjust the slow screen of VRC. A microcomputer that controls the operation of the entire apparatus; A search and monitoring mode detection unit which detects whether the search mode or the monitoring mode is provided to the microcomputer in the slow mode; A first memory for storing an initial slow tracking value; A second memory for storing an optimal slow tracking value; A preamplifier for amplifying and outputting the video signal read by the head to a predetermined level; An envelope detector extracting an envelope of the signal output from the preamplifier; An A / D converter converting the signal output from the envelope detector into a digital signal and outputting the digital signal; A delay signal generator for generating a delay signal by the signal output from the microcomputer; Third, fourth, and fifth memory units for storing digital values output from an A / D converter according to the signals output from the microcomputer; A first comparing unit comparing the values stored in the third, fourth and fifth memory units and outputting a result value; A sixth memory unit for comparing the values stored in the third memory unit and storing the result values; And second and third comparison units for comparing the values stored in the sixth memory unit with the values stored in the third memory unit and outputting the resultant values.