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Digital television program rapid channel switching method

A technology for digital TV and programs, applied in TV, color TV, color TV components and other directions, can solve problems such as difficulties, and achieve the effect of facilitating the operation of changing channels and shortening the time for changing channels.

Inactive Publication Date: 2008-08-27
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solving this problem using hardware is very difficult, and traditional software design does not solve this problem

Method used

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  • Digital television program rapid channel switching method

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Embodiment Construction

[0015] Taking DTMB (National Standard for Terrestrial Digital TV) digital TV modulator vehicle-mounted LCD TV as an example, TS stream demultiplexing and MPEG decoding adopt decoding demultiplexing chip Sti5105; frequency synthesis digital coordinator adopts MINI tuner CDT-9CT2XX; demodulation The device adopts DTMB channel digital demodulation chip LGS8913.

[0016] In the process of searching for programs, first record the important parameters of the searched TS stream. Taking the digital terrestrial wave as an example, the modulation mode (QAM mode), forward error correction (FEC), and interleaving time (TIME) of the TS stream are recorded. INTERLEAVE) and frame control (CONTROL FRAME) are recorded and saved to FLASH. You can call it directly when you need it next time.

[0017] The implementation process is as follows figure 1 Shown:

[0018] 1. When the system receives the channel change command, it starts to perform the channel change action;

[0019] 2. First set th...

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Abstract

The invention relates to the digital television program switching technology. The invention provides a method for quickening the television program switching by reducing the locking time of a demodulator. The digital television program quick switching method includes the following steps: 1, the system receives a switch instruction; 2, the value of a tuner is set according to a tuning parameter; 3, go to step 4 if the tuner is successful to be locked and go to step 7 if the tuner fails to be locked; 4, a pre-stored corresponding TS stream parameter is written into the demodulator and the detection mode of the demodulator is set to be manual; 5, go to step 6 if the demodulator is successful to be locked and go to step 7 if the demodulator fails to be locked; 6, audio and video signals are decoded; 7, the switching is ended. The invention effectively shortens the switching time between the programs with different frequency points in the digital television and facilitates the switching operation of the user.

Description

technical field [0001] The invention relates to digital TV program switching technology. Background technique [0002] Channel switching of digital programs is relatively slow, especially between programs of different frequency points. Sometimes it takes 3 seconds to wait, which is very uncomfortable for users. The program transmission of digital TV adopts multiplexing technology, compression coding technology, and multiplexes 6 to 8 sets of programs at one frequency point, and the receiving end needs to demodulate, demultiplex, decompress, etc. consume more time. Especially when changing from one frequency point to another different frequency point, it is necessary to re-adjust the parameter settings of the tuner (Tuner) and demodulator (Demodulator). The detection mode of the existing demodulator is automatic search. When the tuner locks the channel, the demodulator needs to detect according to the TS stream output by the tuner and reconfigure the relevant TS stream para...

Claims

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Application Information

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IPC IPC(8): H04N5/44H04N5/50H04N7/26
Inventor 梁祖兴
Owner SICHUAN CHANGHONG ELECTRIC CO LTD