Broadband acoustics echo eliminating method
An acoustic echo cancellation and broadband technology, which is applied in two-way sound reinforcement telephone systems, speech analysis, instruments, etc., can solve the problem of large amount of calculation, and achieve the effect of reducing the amount of calculation and improving the efficiency of calculation.
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[0038] The basic idea of the present invention is to use M subband uniform IDFT polyphase filter bank E i (z) Replace M subband analysis filter bank F i (z), it can be decimated before analysis and filtering; and adopt M subband uniform IDFT polyphase filter bank R i (z) Replace M subband synthesis filter bank G i (z), interpolation can be implemented after synthesis filtering; greatly reducing the amount of calculation and improving the efficiency of calculation.
[0039] The present invention will be described in detail below with reference to the drawings and embodiments.
[0040] figure 2 It is a schematic structural diagram of a broadband acoustic echo cancellation system using an M subband uniform IDFT polyphase filter bank according to the present invention.
[0041] Such as figure 2 As shown, the present invention uses M subband uniform IDFT polyphase filter bank E i (z) Replace M subband analysis filter bank F i (z); and use M subband uniform IDFT polyphase filter ba...
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