KR19990047547A - VSI's V-Lock Error Detection System - Google Patents

Abstract

The present invention relates to a V-lock error detection system of VSI. When the pause mode is set during VSI tape playback, the V-lock is detected by detecting a time difference between each rising edge of the video switching pulse and the pseudo vertical sync signal. If the time difference is not detected, the message is displayed on the OSD screen so that the user can take a countermeasure afterwards. By preventing the V-lock from being misaligned, the screen shakes up and down. To reduce the number of requests.

To this end, the present invention provides a first step of setting a pause mode when a pause data is input during playback of a BD tape, detecting a video switching pulse and a pseudo vertical sync signal, and calculating a time difference between rising edges of each signal; And comparing the time difference calculated in the first step with a value of a state in which the V-lock is matched, and outputting a message for guiding the V-lock through the OSD screen if the V-lock is not matched. It features.

Description

VSI's V-Lock Error Detection System

The present invention relates to a VSI system capable of detecting and displaying a V-lock error in a still mode. More particularly, the present invention relates to a video switching when a pause mode is set during VSI tape playback. By comparing the pulse and pseudo vertical sync signal, if the V-lock is not matched, the on-screen display (hereinafter referred to as OSD) outputs a message notifying the screen shaking due to the V-lock error. The present invention relates to a V-lock V-lock error detection system that allows a user to watch a cleaner playback screen while reducing the number of repair requests by appropriately dealing with a post-process.

In general, the BSA system basically includes a tuner circuit composed of a frequency tuning circuit, a PLL IC, a local oscillator, a frequency synthesizing circuit, and the like so that a user can receive a broadcast signal of a desired channel as a recording source. It is provided with a plurality of line input terminals and line output terminals that can be connected to provide a signal that is reproduced from another VSI system as a recording source to record or reproduce and output.

And a traveling system for recording or reproducing the video and audio signals provided from the signal sources on a tape, and outputting video and audio signals and OSD characters outputted from the traveling system to the TV side. Signal processing means and OSD processing means are provided, and key input means for selecting an operation mode of a VSI system as an interface with a user is provided.

In addition, the microprocessor controls the entire operation related to the tape driving during power on / off and recording / playback by the key input signal or the signal sensed by various sensors, and automatically controls the recording by determining the presence / absence of the broadcasting signal on the desired channel. Consists of including.

When the playback mode is selected in the conventional VSA system having such a configuration, the traveling system and the deck driving unit perform a tape playback operation, are processed through the video signal processing unit, and then output to the outside through the cathode ray tube of the TV.

At this time, the video signal processing unit detects and supplies a vertical synchronization signal included in the video signal to the microprocessor. Therefore, the microprocessor controls the servo circuit, the system controller, or other control operation using the synchronization detection result. You can then run

When the video signal processor demodulates a signal reproduced from a tape or performs phase control / synchronization control of a deck mechanism in a system, a vertical synchronization signal is used.

However, the vertical sync value (V-lock value) is configured to process the gains differently for each company, so that the default value of the initial V-lock recorded on the playback tape when the pause mode is set during the playback of VSI tape is set. If the V-lock values of the system do not match with each other, the playback screen may be distorted or shaken up and down.If this is a mistake, it is inconvenient to shake the screen. There was a problem such as fighting.

Accordingly, the present invention has been made to solve the above problems, and the present invention is to calculate the time difference between each rising edge portion of the video switching pulse and the pseudo vertical sync signal when the pause mode is set during the playback of VSI tape. If the V-lock error is detected, the OSD screen displays a message to guide the V-lock adjustment so that the user can deal with it afterwards. The object of the present invention is to provide a V-lock V-lock error detection system that reduces the number of service requests and prevents a user from seeing a malfunction and enables a user to watch a cleaner playback screen.

In order to achieve the above object, the present invention calculates the time difference of the rising edge of each signal by detecting the video switching pulse and the pseudo vertical sync signal after setting the pause mode when the pause data is input during the playback of VSI tape. The first step to do; The second step of outputting a message for adjusting the V-lock through the OSD screen when the time difference calculated in the first step is compared with the value of the state in which the V-lock is matched and the V-lock is not matched. Sial's V-lock error detection system.

1 is a block diagram schematically showing the configuration of V-lock V-lock error detection system according to an embodiment of the present invention

2 is a flowchart for explaining a V-lock error detection and display operation in a pause mode.

3 is a waveform diagram of a video switching pulse and a pseudo vertical synchronizing signal used in V-lock error detection according to the present invention.

** Explanation of symbols for the main parts of the drawings **

11 remote control 12 remote control receiver

20: comparison unit 30: microprocessor

40: OSD processing unit

Hereinafter, the configuration of the V-lock V-lock error detection system according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing the configuration of a V-lock V-lock error detection system according to an exemplary embodiment of the present invention, and includes a plurality of keys for selecting an operation mode of the V-system in an interface with a user. And a remote controller 11 for remotely controlling the VSI system main body and a remote controller receiver 12 for receiving the remote controller key data. The video switching pulse and the pseudo vertical synchronization signal (QV-SYNC) are provided. A comparator 20 for comparing and outputting the time difference of the rising edge of each signal as an input is provided.

In addition, by controlling key input signals or signals sensed by various sensors, all operations related to tape driving during power on / off and VSI tape recording / playback are controlled. If the pause mode is set during VSI tape playback, the time difference of the comparator 20 is detected and compared with a predetermined value. If the V-lock is not matched as a result of the comparison, a message output indicating the status is output. It is preferable to include a microprocessor 30 for controlling, and an OSD processing unit 40 for generating a guide message according to the control signal of the microprocessor to output to the video output terminal.

FIG. 2 is a flowchart illustrating a V-lock error detection and display operation in a pause mode. When the pause mode setting data is input from a remote controller receiver during playback of a BD tape, the microprocessor of FIG. The figure shows a V-lock error detection and display operation for detecting and executing a negative output.

That is, as shown in the drawing, if pause data is input during VSI tape playback, the pause mode is set, and then the video switching pulse and the pseudo vertical sync signal are detected to calculate the time difference of the rising edge of each signal. Compare the time difference calculated in the first step (S211-S213) and the first step with the value of the V-lock matching state, and if the V-lock does not match, a message to guide the V-lock adjustment is displayed. It can be described by dividing into the second step (S214, S215) output through.

In this case, the first step is performed when pause data is input during the playback of VSI tape, and controlling the deck mechanism to the pause state (S211, S212), the video switching pulse and the pseudo vertical synchronizing signal (QV-). SYNC) is detected to calculate the time difference of the rising edge of each signal (S213).

In the second step, the time difference calculated in the first step is compared with the value of the V-lock matching state (S214), and if the V-lock is the matching result, the pause mode is maintained as it is. If the V-lock is not in the correct state, the message guiding the V-lock adjustment is output through the OSD screen (S215).

FIG. 3 is a waveform diagram of a video switching pulse and a pseudo vertical synchronizing signal used in V-lock error detection according to the present invention. In the state in which V-lock is exactly matched, a time difference between the rising edges of the two signals is 5 [msec]. ].

The operation of the present invention as described above is as follows.

First, when the microprocessor 30 receives the pause data from the remote controller 11 and the remote controller receiver 12 (Y branch of S211), the microprocessor 30 controls the deck mechanism (S212) to make the pause state.

At this time, the microprocessor 30 checks the output of the comparator 20 to detect the time of the rising edge portion of the pseudo vertical synchronization signal QV-SYNC and the rising edge portion of the video switching pulse, and randomly detects the detection result. The reference value, i.e., V-lock, is compared with the value (5 ± 0.3 [msec]) in a state of matching (S214).

At this time, if the time difference is 5msec ± 0.3msec which is the time when the V-lock is hit, the V-lock is right. If not 5msec ± 0.3msec, the V-lock is not right. If not (N branch of S214) the microprocessor 20 outputs a guide message of the phrase "Please set the shake of the screen with the increase / decrease the channel" through the OSD processing unit 40 through the OSD screen (S215) The user can then view the message on the OSD screen and set the V-lock using the channel up / down keys.

According to the present invention as described above, if the V-lock is not matched in the pause mode, a message for adjusting the screen with the channel increase / decrease key is displayed on the OSD screen. In addition to preventing misunderstandings, there is an advantage of allowing the user to watch a tape playback screen without shaking.

Claims (1)

A first step of setting a pause mode when the pause data is input during VSI tape playback and detecting a video switching pulse and a pseudo vertical sync signal to calculate a time difference between rising edges of each signal; The second step of outputting a message for adjusting the V-lock through the OSD screen when the time difference calculated in the first step is compared with the value of the state in which the V-lock is matched and the V-lock is not matched. Sial's V-lock error detection system.