Low-complexity silence detection method
A silent detection, low-complexity technology, used in speech analysis, instruments, etc., to solve problems such as being unsuitable for low-end products
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[0046] Example
[0047] Such as figure 1 As shown, this embodiment discloses a low-complexity silent detection method, and the specific steps are as follows:
[0048] (1) Take f s =8kHz sampling frequency to sample the analog audio signal to get the sampling signal X [n] ;
[0049] (2) Audio sampling signal X [n] Perform low-pass, band-stop, and high-pass filter processing at the same time to obtain the sub-signal X1 [n] , X2 [n] And X3 [n] ;In this embodiment, it is used for X [n] The coefficients of the filter coefficients for low-pass, band-stop and high-pass filter processing are respectively h 1 , H 2 And h 3 They are:
[0050] h 1 = [ 1 4 , 1 2 , 1 4 ] ;
[0051] h 2 = [ 2 4 , 0 , - 2 4 ] ;
[0052] h 3 = [ - 1 4 , 1 2 , - 1 4 ] .
[0053] Among them, the amplitude-frequency response characteristics of low-pass, band-stop and high-pass filter processors|H1(e jω )|, |H2(e jω )|and|H3(e jω )|Respectively as figure 2 Shown.
[0054] ...
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