KR0127505B1 - Method to prevent flickering of reproduction display part in hi-fi tape - Google Patents

Abstract

Disclosed is a method to prevent flickering of an OSD or a digitron when a high-fidelity tape is replayed in a video tape recorder/replayer. In the method, the replayed tape is determined whether in an auto tracking mode or not. If the replayed tape is in an auto tracking mode, a high-fidelity/normal detector(2) is controlled to select a normal voice mode during auto-tracking. If the auto-tracking is completed, the high-fidelity/normal detector(2) is controlled to select a high-fidelity voice mode. Thereby, the flickering can be prevented according to the function of high-fidelity/normal detector(2).

Description

How to prevent flicker on the display during Hi-Fi tape playback

1 is a block diagram showing a general video tape playback process.

2 is a flowchart of operation according to the present invention.

* Explanation of symbols for main parts of the drawings

1: V seed eggs 2 hi-fi / normal detector

3: Servo / Secicon 4: Timer

5: display unit 6: TV

The present invention relates to a method of preventing flicker of a display unit during Hi-Fi tape playback, and particularly, in case of auto tracking or when a video tape is inserted into a deck, an OSD (On Screen Display) or a Digitron is used. This is to prevent the display from flickering.

A general video tape playback process will be described below with reference to FIG.

When playing back a tape, VC knows first whether the voice recorded on the tape is Hi-Fi or Normal. The hi-fi / normal detector 2 of (1) detects and sends the corresponding level (5V or OV) to the servo / ciscon unit 3. Then, in the servo / ciscon section 3, if the detection state of the hi-fi / normal detector 2, for example, high-fi voice, is detected, the servo / ciscon section 3 informs the timer unit 4 that the hi-fi voice is detected and the detector 2 When the high level signal is sent to the audio output signal selection signal), the hi-fi / normal detection unit 2 selects the normal voice, and when the low level signal is sent, the hi-fi voice is selected.

On the other hand, the timer unit 4 turns on the display unit 5 at the same time as the Hi-Fi playback. (TV SET) (6) Controls to display the letters `` Hi-Fi Left + Right '' on the screen. However, in the prior art as described above, the output of the hi-fi / normal detection unit 2 is `` high ↔ low several times as the tape speed is changed to + and-during the hi-fi tape insertion into the deck or the auto tracking. The repetition causes the LED / digitron to be repeatedly turned on and off in the display unit 5 through the servo / ciscon unit 3 and the timer unit 4.

Also, TV Characters appearing on the screen in (6) also appeared and disappeared, causing intermittent noise. Flickering and noise are more acute, especially in high-fi tape conditions such as protape.

The present invention is to solve the above-mentioned shortcomings, the display unit that does not flicker, as well as the noise of the LED and the digitron of the character or display portion of the screen when the hi-fi tape is inserted into the deck or auto tracking TV The purpose of the present invention is to provide a method of preventing flicker.

In order to achieve the above object, the present invention provides a high-fi / normal detector in the servo / scicon unit even if a high-fi tape is repeatedly outputted from the hi-fi / normal detector during the auto tracking. Output high signal to control Hi-Fi / Normal detector to select normal voice and simultaneously And teave Each display unit of is characterized by providing a method of indicating that the hi-fi state.

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

FIG. 1 is a block diagram showing a general video tape playback process, and a hi-fi / normal detection unit 2 for detecting whether a playback tape is hi-fi or normal, and the high-fi tape when the hi-fi tape is inserted into a deck or during auto tracking. A servo / ciscon unit 3 for outputting a control signal so that the pi / normal detection unit 2 selects a normal voice, a timer unit 4 for controlling the output of the sub / ciscon unit 3, and V grain which displays the state of the playback tape under the control of the timer section 4 (1) Display section 95 and TV It is comprised including the character display part of (6).

The operation flow of the present invention according to such a configuration will be described with reference to FIG. In other words, when the hi-fi tape is inserted into the deck or the auto tracking is performed, the hi-fi / normal detection unit 2 repeatedly outputs the hi-fi sound and normal audio signals to the servo / ciscon unit 3. Then, the servo / ciscon unit 3 recognizes that a hi-fi audio signal is input, and the servo / ciscon unit 3 determines whether or not the auto tracking mode is maintained while maintaining the current high-fi state. If it is not in the mode, it maintains the current hi-fi state, which corresponds to the steps S1 and S2.

On the other hand, it is determined whether the auto tracking mode is applied while the current hi-fi state is maintained, and auto tracking is performed in the current auto tracking mode. At the same time, the servo / ciscon unit 3 sets the high level to the hi-fi / normal detection unit 92. The output is controlled to select the normal output, which corresponds to steps S3 to S7.

At this time, V seed eggs Through the display section 5 of (1), it is indicated that the playback tape is hi-fi voice. The character display portion of (6) displays the characters Hi-Fi Left + Right.

Therefore, even if the 'high-low' signal is repeatedly outputted from the hi-fi / normal detector 2 to the servo / ciscon unit 3, the servo / ciscon unit 3 is not known. 1 and TV Each display unit in (6) is controlled to indicate that it is in a hi-fi state, and the hi-fi / normal detector 2 is for selecting a normal voice.

On the other hand, VRF as described above (1) performs auto tracking and determines whether auto tracking is completed. At this time, when auto tracking is completed, the servo / ciscon unit 3 outputs a low level to the hi-fi / normal detection unit 2 so as to output high-fi. The normal detection unit 2 selects the hi-fi voice and sends it to the servo / ciscon unit 3 (steps S4 to S6).

Even at this time Display part (1) and TV of (1) Through (6) it is continuously indicated that the hi-fi state. That's the V seed eggs (1) and TV The display portion (6) continues to indicate that the state is hi-fi, and the hi-fi / normal detector 2 selects the hi-fi voice to hear the hi-fi voice.

According to the present invention as described above, the normal voice is selected as the hi-fi / normal detector 3 when the hi-fi tape is inserted into the deck or during the auto tracking. Not only can it prevent, but also has the effect of preventing noise.

Claims (1)

Auto-tracking mode judgment process for judging whether the auto-tracking mode is inserted into the hi-fi playback tape, and if it is determined that the tracking mode is determined as the auto-tracking mode judgment process, the hi-fi / normal detection unit selects the normal voice and Seed And teave The auto-tracking operation completion judgment process of displaying the hi-fi character on the display unit of the auto-tracking operation and determining whether the auto-tracking operation is completed, and the hi-fi / normal Select Hi-Fi voice from the detector and continuously And teave A method of preventing flicker of a display unit during hi-fi tape playback, characterized by comprising a hi-fi playback operation process for displaying a hi-fi character with each display unit and performing a playback operation.