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Method for intelligently channel scanning and related apparatus

An intelligent, channel technology, applied in the field of channel scanning, which can solve problems such as unsatisfactory accuracy, large error, and reduced processing speed.

Inactive Publication Date: 2011-02-09
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the center frequency and bandwidth of each digital video broadcasting channel are not fixed, such digital video broadcasting channel scanning method is quite slow, and those skilled in the art can understand the known technology to guess the arrangement and combination of the center frequency and bandwidth of many signal bands, the number Huge permutations and combinations lead to a large amount of calculations, and the accuracy is not ideal
At present, it takes more than 40 minutes for digital video broadcast tuners on the market to find out the complete center frequency and bandwidth of digital video broadcast, and the error is quite large, which will cause the burden on the back-end circuit and reduce the processing speed

Method used

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  • Method for intelligently channel scanning and related apparatus
  • Method for intelligently channel scanning and related apparatus
  • Method for intelligently channel scanning and related apparatus

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Embodiment Construction

[0046] figure 2 Represent the flow chart of the method for intelligent channel scanning according to a preferred embodiment of the present invention, step 201, receive a video signal; step 202, analyze the frequency spectrum of the video signal; step 202, obtain multiple frequency bands according to the frequency spectrum analysis result of the video signal Center frequency; step 203, obtain a coarse bandwidth related to each center frequency according to the center frequency. Preferably, the video signal can be a digital video broadcasting signal, and the analog-to-digital conversion circuit can be used to convert the video signal into a digital signal, and then perform Fourier transform on it to analyze the frequency spectrum of the video signal.

[0047] image 3 express figure 2 A schematic diagram of the spectrum analysis step 202 shown in . For example, Welch-Bartlett scanning can be utilized, assuming that the first scan scans to complete signal bands 301, 303, 305...

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Abstract

The invention discloses an intelligent method for scanning channels and a relative device. The invention is used for searching the center frequency of the channel of a video signal and a relative symbol rate. The intelligent method for scanning channels comprises: scanning the video signal for carrying out frequency spectrum analyzing, obtaining the central frequency and a plurality of crude regulated bandwidths according to the frequency spectrum analysis of a plurality of bandwidths in the video signal; utilizing the density of a power frequency spectrum and the crude regulated bandwidths to obtain the accurate symbol rate.

Description

technical field [0001] The present invention relates to channel scanning, in particular to an intelligent channel scanning device for finding the center frequency and symbol rate of a video signal channel and related methods. Background technique [0002] figure 1 Represents a video signal 100 in the frequency domain, the video signal 100 comprises a plurality of signal bands 101, 103 and 105, etc., the signal bands 101, 103 and 105 respectively have a center frequency f c1 , f c2 , f c3 and bandwidth f b1 , f b2 , f b3 . Therefore, if you want to get a correct image, you must first find out the correct center frequency f c1 , f c2 , f c3 and bandwidth f b1 , f b2 , f b3 . [0003] Traditionally, digital video broadcasting (DVB) signals transmitted by satellite go through a tuner (tuner) to find out the correct center frequency and bandwidth, by gradually guessing the center frequency and bandwidth of each signal band, and then handing it over to the back-end fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/44H04N5/50
Inventor 吴山宗
Owner MEDIATEK INC