KR20000043299A - Video signal delay method in satellite broadcast receiver - Google Patents

Abstract

PURPOSE: A video signal delay method is provided to output an image and a voice at the same time by delaying a video signal in the case that the video signal is received earlier than the audio signal. CONSTITUTION: A method comprises the steps of: detecting video and audio signals from a received satellite broadcast signal(S102); extracting the video and audio signals of a predetermined time interval from the detected video and audio signals(S103); converting the extracted video and audio signals into digital signals(S104); judging whether the video signal is received earlier than the audio signal based on the digital video and audio signals(S105); and delaying the received video signal by a predetermined time in case that the video signal is received earlier than the audio signal(S107).

Description

Video Signal Delay Method in Satellite Broadcast Receiver

The present invention relates to a satellite broadcast receiver, and more particularly, to a method of delaying a video signal using a memory in a satellite broadcast receiver.

In the related art, when a satellite broadcast is viewed, the screen is different from the satellite via the screen, so that the screen is received faster than the voice, which causes inconvenience in viewing.

Accordingly, the present invention is to solve such a conventional problem, the video signal can be delayed when the video signal is received faster than the audio signal due to the difference between the satellite via the video signal and the audio signal when watching satellite broadcasts The purpose is to provide a method.

In order to achieve the above object, the present invention comprises the steps of (a) detecting video and audio signals in a received satellite broadcast signal; (b) extracting video and audio signals at predetermined time intervals from the detected video and audio signals; (c) converting the extracted predetermined time interval video and audio signals into digital signals, respectively; (d) determining whether the video signal was received earlier than the audio signal based on the digital video and audio signals; (e) delaying the received video signal by a predetermined time when the video signal is received earlier than the audio signal in step (d); (f) determining whether the delayed video signal was received earlier than the audio signal; And (g) step (f) controlling a delay time of the video signal when the delayed video signal is received earlier than the audio signal. .

1 is a block diagram showing the configuration of a video signal delay apparatus in a satellite broadcast receiver according to a preferred embodiment of the present invention.

2 is a flowchart illustrating a video signal delay method in a satellite broadcast receiver according to a preferred embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

102: Tuner 104: Video Detector

106: audio detector 108,110: sampling circuit

112,114: A / D converter 116: control unit

118: memory 120,122: D / A converter

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

1 shows a configuration of a video signal delay apparatus in a satellite broadcast receiver according to a preferred embodiment of the present invention. The video signal delay device includes a tuner 102, a video detector 104, an audio detector 106, a first sampling circuit 108, a second sampling circuit 110, and a first analog / digital converter; A / D, 112, second A / D converter 114, controller 116, memory 118, first digital / analog (D / A) converter 120, and second D / A converter 122 is included.

Tuner 102 receives satellite broadcast signals. The video detector 104 detects the video signal from the satellite broadcast signal received by the tuner 102. The audio detector 106 detects the audio signal from the satellite broadcast signal received by the tuner 102.

The first sampling circuit 108 extracts a video signal of a predetermined time interval from the video signal detected by the video detector 104. The second sampling circuit 110 extracts an audio signal of a predetermined time interval from the audio signal detected by the audio detector 104.

The first A / D converter 112 converts the video signal of the predetermined time interval extracted by the first sampling circuit 108 into a digital signal. The second A / D converter 114 converts the audio signal of the predetermined time interval extracted by the second sampling circuit 110 into a digital signal.

The controller 116 determines whether the video signal is received earlier than the audio signal based on the digital video and audio signals. In this case, when the video signal is received earlier than the audio signal, the controller 116 delays the received video signal by a predetermined time. That is, the controller 116 stores the received video signal in the memory 118. The controller 116 outputs a video signal stored in the memory 118 after a time elapsed between a reception time difference between the video and audio signals. The controller 116 determines whether the delayed video signal is received earlier than the audio signal. In this case, when the delayed video signal is received earlier than the audio signal, the controller 116 increases the delay time of the video signal.

The first D / A converter 120 converts the video signal from the controller 116 into an analog signal. The second D / A converter 122 converts the audio signal from the controller 118 into an analog signal.

Hereinafter, a video signal delay method in a satellite broadcast receiver according to a preferred embodiment of the present invention will be described with reference to FIG. 2 illustrates a video signal delay method in a satellite broadcast receiver according to a preferred embodiment of the present invention.

In step S101, the tuner 102 receives the satellite broadcast signal. In step S102, video and audio detectors 104 and 106 detect video and audio signals, respectively, in the satellite broadcast signal received by the tuner 102. In step S103, the first and second sampling circuits 108 and 110 extract video and audio signals at predetermined time intervals from the video and audio signals detected by the video and audio detectors 104 and 106, respectively. do. In step S104, the first and second A / D converters 112 and 114 perform digital and video signals at predetermined time intervals extracted by the first and second sampling circuits 108 and 110, respectively. Convert to

In step S105, the control unit 116 determines whether the video signal was received earlier than the audio signal based on the digital video and audio signals from the first and second A / D converters 112 and 114. do. As a result of the determination in step S105, all the operations are terminated when the video signal is received simultaneously with the audio signal. Alternatively, when the video signal is received earlier than the audio signal, the controller 116 stores the received video signal in the memory 118 (step S106). In step S107, the controller 116 outputs the video signal after the elapse of the time difference between the reception time of the video and audio signals based on the determination result of step 105. In step S108, the controller 116 determines whether the delayed video signal is received earlier than the audio signal. As a result of the determination in step S108, all operations are terminated when the delayed video signal is received simultaneously with the audio signal. Alternatively, if the delayed video signal is received earlier than the audio signal, the controller 116 increases the delay time of the video signal (step S109) and the processing routine returns to step S108.

As described above, according to the present invention, when the satellite signal through the video signal and the audio signal is different from each other and the satellite receives the video signal faster than the audio signal, the video signal is delayed to simultaneously output the screen and the audio. .

Claims (2)

(a) detecting video and audio signals in the received satellite broadcast signal; (b) extracting video and audio signals at predetermined time intervals from the detected video and audio signals; (c) converting the extracted predetermined time interval video and audio signals into digital signals, respectively; (d) determining whether the video signal was received earlier than the audio signal based on the digital video and audio signals; (e) delaying the received video signal by a predetermined time when the video signal is received earlier than the audio signal in step (d); (f) determining whether the delayed video signal was received earlier than the audio signal; And (g) step (f) controlling a delay time of the video signal when the delayed video signal is received earlier than the audio signal. The method of claim 1, wherein step (e) comprises: storing the received video signal; And outputting the video signal after the elapse of the time difference between the reception time of the video and audio signals based on the determination result of step (d).