Signal processing device and method thereof

Abstract

The invention discloses a signal processing device and a method thereof. The signal processing device has high image-text television processing efficiency. The signal processing device is collocated for receiving and coding transport stream to display, wherein the transport stream provides image-text television information correlated with a plurality of image-text television lines and video information correlated with a plurality of video lines. The signal processing device comprises an internal memory, a vertical blanking interval controller and a television coder, wherein the internal memory is collocated for memorizing line enable signals and line data correlated with a plurality of image-text television lines and video lines; the vertical blanking interval controller is coupled to theinternal memory and is collocated for reading the internal memory to obtain the data line correlated with enable image-text television lines in the plurality of image-text television lines; and the television coder is coupled to the vertical blanking interval controller and is collocated for receiving and coding the line data correlated with the plurality of image-text television lines.

Description

technical field [0001] The invention relates to the field of video processing, in particular to a teletext (TELETEXT) information processing technology. Background technique [0002] The signal transmitted to a television or many other types of display devices to generate images usually includes a vertical blanking interval (VBI). VBI is the time between the last line of a frame and the start of the next frame. TV stations usually use part of the VBI to transmit control information required for video information display. This control information contains, for example, a video synchronization signal. In addition, a part of the VBI is usually reserved for playing closed captions (Closed Captioning) for the hearing impaired. The TV station can also use the time in the VBI to broadcast various other different types of data, usually called "Teletext" and selected by the TV station itself. [0003] Teletext consists of information such as news, sports, and financial informatio...

AI Technical Summary

Problems solved by technology

Processing such a considerable number of buffers 142 causes a heavy load on the VBI controller 140 and thus causes a long delay (Latency), especially when the screen is switched

Furthermore, the permanently set buffer 143 limits not only the total number of teletext lines, but also the individual numbers of teletext lines (e.g. always items 5-22 or 317-334 for the PAL standard)

Therefore, the elasticity and adaptability of data transmission are not good

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