Mstar Semiconductor, Inc.

Chih-Hsun Lin

Tai-Lai Tung

Chih-Cheng Kuo

A method for estimating a channel state of an audio/video signal includes: estimating a first response and a second response according to the audio/video signal, wherein the first response corresponds to an echo path and the second response corresponds to a reference path; calculating a plurality of phase differences at a plurality of time points between the first response and the second response; determining whether the echo path is a Doppler path according to the phase differences; and when it is determined that the echo path is the Doppler path, calculating a phase rotation frequency of the Doppler path according to a difference between at least two of the phase differences.

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Hsinchu County, Taiwan

Chih-Hsun Lin