Digital TV channel deducing device

Abstract

This invention relates to a presumption device of digital TV channel, which comprises a correlative value generating part, used for getting base belt signal and the signal during train; a correlative value maximum hunting part used in the pulse of the actual channel; the correlative value guidance generating part, used for outputting the correlative guidance corresponding to the CIR assigned range; the memory, used for outputting the self correlative value array of the train range signal; the computing part, used for computing the CIR assigned value with the correlative value radio guidance and the array of the self correlative value; the CIR separating part, used for removing the noise in the CIR assigned value.

Description

technical field [0001] The present invention relates to digital TV, in particular to a digital TV channel derivation device capable of inferring a more accurate impulse response of a specified channel in a video channel. Background technique [0002] The terrestrial frequency TV signal transmitted in 8 VSB (Vestigial Side Band) mode reaches the receiving end through dynamic multi-path channels. Since the arriving signal is seriously interfered by adjacent signals, in order to restore the original signal, it is inevitable to use an equalizer. [0003] At present, the receiver of a single feedback frequency transmission system similar to the VSB method uses equalizers most of the time, and the most representative one is the nonlinear decision feedback equalizer (Decision Feedback Equalizer: DEF below). [0004] The above-mentioned equalizer adopts the least-mean-squares (LMS; least-mean-squares) method. Although it has the advantage of being simple, when the interference phen...

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Problems solved by technology

[0029] In order to cancel the data image contained in the channel impulse response (CIR), because of the characteristic of moving average, the equalizer for the time domain updated in symbol units in the video channel shows very weak characteristics

[0030] At the same time, when in the limit method, even the channel impulse response (CIR) value exceeding the critical value cannot activate the filter tail of the jitter integration filter (pulse sharing filter) at the transmitting end and the integrated filtering (matched filter) at the receiving end, and Severe performance overheating occurs

[0031] In addition, the actual DTV terrestrial frequency reception environment, even if the reception environment is good, still has frequency spectrum fluctuations to some extent. When these channel derivation devices are used in DTV receivers, there will be synchronous multiple channels (dynamic multipath channel) The poor reception performance of the

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