KR19990049083A - How to control video format and display screen size change of digital satellite broadcasting receiver - Google Patents

Abstract

The present invention relates to a method for controlling video format and display screen size change of a digital satellite broadcasting receiver. Particularly, a method of controlling a video stream information by periodically checking a received video stream and checking whether or not the information of the video stream changes, and the video format information is changed as a result of the video stream check. If the display screen size information is changed, it controls to change to the corresponding display screen size automatically so that the video format and display screen size that can be serviced in various video formats and display screen sizes are automatically changed. It relates to a control method.

Description

How to control video format and display screen size change of digital satellite broadcasting receiver

The present invention relates to a receiver of a digital satellite broadcasting system, and more particularly, to a method of detecting a video stream received from a satellite and automatically changing the video format and the display screen size according to the video format information and the display screen information. will be.

In general, a digital satellite broadcasting system is a system that transmits a broadcast signal to each terminal using a satellite, and one transponder may include several programs, and one program includes audio, video, and various kinds of data. Can be multiplexed. A digital satellite broadcasting receiver is a device that receives this signal through a small home antenna, receives an amplified signal, decodes it, and converts it into a signal that can be viewed on a subscriber's television.

1 is a block diagram of a general digital satellite broadcasting receiver.

As shown, an antenna 1 for receiving broadcast waves from satellites; A central processing unit (3) for converting the broadcast signal received from the antenna (1) to control the overall operation to be displayed on the subscriber's television; A tuner / demodulator (2) for tuning and demodulating the signal received at the antenna (1) to a corresponding channel under control of the central processing unit (3); A demultiplexer (4) for demultiplexing the signal transmitted from the tuner / demodulator (2) into an audio signal and a video signal; An audio / video decoder (5) for decoding the audio signal and the video signal through the demultiplexer (4), respectively; It consists of an analog encoder 6 which encodes an audio signal and a video signal through the audio / video decoder 5 in a corresponding format, respectively.

Referring to the operation of the digital satellite broadcast receiver configured as described above, the broadcast signal from the satellite is first received through the antenna 1. The tuner / demodulator 2 tunes and demodulates the broadcast signal received by the antenna 1 to the corresponding channel under the control of the central processing unit 3 and transmits the demodulated signal to the demultiplexer 4. Then, the demultiplexer 4 demultiplexes the demodulated and transmitted signal into a video signal and an audio signal, and the audio / video decoder 5 decodes the demultiplexed audio signal and the video signal to the analog encoder 6. Will be delivered.

However, such a general digital satellite broadcast receiver cannot detect information about the video stream format and the display screen size through the audio / video decoder 5, and thus cannot automatically adjust the video stream output from the analog encoder 6 automatically. Therefore, there was a need to change the video format and the display screen size by receiving a setting signal from an external user.

In addition, since the video format and the display screen size corresponding to the incoming video stream cannot be changed automatically, there is a limitation of providing one type of video format and one type of display screen size.

Disclosure of Invention An object of the present invention is to solve the above-mentioned conventional problem, and in particular, it is possible to digitally detect a received video stream periodically and control the automatic change to the corresponding video format and display screen size. The present invention provides a method of controlling the video format and display screen size change of a satellite broadcasting receiver.

In order to achieve the above object, the present invention (method) is,

Checking a received video stream periodically to check whether information of the video stream has changed; A video format changing step of controlling to automatically change to a corresponding video format when the video format information is changed as a result of the video stream check; If the display screen size information is changed as a result of the video stream check, the method comprises a display screen size changing step of controlling the display screen size to be automatically changed to the corresponding display screen size.

1 is a block diagram of a general digital satellite broadcasting receiver;

2 is a flowchart illustrating a video format and display screen size control method of a digital satellite broadcasting receiver according to the present invention;

<Explanation of symbols for main parts of the drawings>

1: Antenna 2: Tuner / Demodulator

3: demultiplexer 4: central processing unit

5: Audio / Video Decoder 6: Analog Encoder

Hereinafter, the configuration and operation of an embodiment according to the technical spirit of the present invention "method of controlling the video format and display screen size change of a digital satellite broadcasting receiver" will be described in detail with reference to the accompanying drawings.

<Example>

First, according to an embodiment of the method for controlling the video format and the display screen size of the digital satellite broadcasting receiver, as shown in FIG. 2, a video stream check for periodically checking the received video stream to check whether the information of the video stream changes. Steps ST11-ST12; A video format changing step (ST13-ST14) of controlling to automatically change to a corresponding video format if the video format information is changed as a result of the video stream check; If the display screen size information is changed as a result of the video stream check, the display screen size changing step (ST15 to ST16) is performed to automatically change to the corresponding display screen size.

Referring to the video format and the display screen size control method of the digital satellite broadcasting receiver according to the present invention made as described above are as follows.

First, when a broadcast signal is received from the satellite through the antenna 1, the tuner / demodulator 2 tunes and demodulates the received broadcast signal to the corresponding channel and delivers the demodulated signal to the demultiplexer 4. The demultiplexer 4 then multiplexes the demodulated signal into a video signal and an audio signal, respectively, and delivers the demodulated signal to the audio / video decoder 5.

Video streams received from digital satellite broadcasts may provide various types of video formats and display screen sizes, depending on the area serviced by the satellite and the quality of service. The video format has unique formats such as NTSC, PAL, SECAM, etc., and provides various display screen sizes of 16: 9, 4: 3, and 20: 9 depending on the program.

Accordingly, the CPU 3 periodically detects a video stream input to the audio / video decoder 5 (ST11), and then compares the video stream with the previous video stream. If the information is changed (ST12), the video format information is examined, and if the video format information is changed, it is controlled to be changed to a video format corresponding thereto (ST13-ST14).

If the display screen size information is changed, the display screen size is automatically changed to the corresponding display screen size (ST15-ST16). Thus, by detecting the video stream in the central processing unit 3 it is possible to control to automatically change to the corresponding video format and the corresponding display screen size.

As described above, the present invention "method of controlling the video format and display screen size change of the digital satellite broadcasting receiver", in particular, by detecting the received video stream to automatically change to the video format and display screen size of the external Even if a video format and a display screen size setting signal are not input from a user, the video signal is automatically changed to match the video stream information.

Claims (1)

A video stream checking step (ST11-ST12) of periodically checking a received video stream to check whether information of the video stream has changed; A video format changing step (ST13-ST14) of controlling to automatically change to a corresponding video format if the video format information is changed as a result of the video stream check; If the display screen size information is changed as a result of the video stream check, the display screen size change step (ST15-ST16) of controlling the display screen size is automatically changed to change the video format and display screen size of the digital satellite broadcasting receiver. Control method.