A non-transitory computer readable storage medium storing instructions which, when executed by a processor of an apparatus for detecting a valid voice signal, are operable with the apparatus to:
- obtain a first audio signal of a preset duration, wherein the first audio signal comprises at least one audio frame signal;
- obtain a plurality of wavelet decomposition signals respectively corresponding to the at least one audio frame signal by performing wavelet decomposition on each audio frame signal, wherein each wavelet decomposition signal contains a plurality of sample points and an audio intensity value of each sample point;
- obtain a wavelet signal sequence by combining the wavelet decomposition signals corresponding to the at least one audio frame signal according to a framing sequence of the at least one audio frame signal in the first audio signal;
- obtain a maximum value and a minimum value among audio intensity values of all sample points in the wavelet signal sequence, and determine a first audio intensity threshold according to the maximum value and the minimum value among the audio intensity values of all the sample points in the wavelet signal sequence;
- and
- obtain sample points each having an audio intensity value greater than the first audio intensity threshold in the wavelet signal sequence, and determine a signal of sample points in the first audio signal corresponding to the sample points each having an audio intensity value greater than the first audio intensity threshold in the wavelet signal sequence as the valid voice signal,
- wherein the instructions operable with the apparatus to determine the first audio intensity threshold according to the maximum value and the minimum value among the audio intensity values of all the sample points in the wavelet signal sequence are operable with the apparatus to:
- determine the first audio intensity threshold and a second audio intensity threshold according to the maximum value and the minimum value among the audio intensity values of all the sample points in the wavelet signal sequence, wherein the first audio intensity threshold is less than the second audio intensity threshold,
- wherein the instructions operable with the apparatus to determine the signal of the sample points in the first audio signal corresponding to the sample points each having the audio intensity value greater than the first audio intensity threshold in the wavelet signal sequence as the valid voice signal are operable with the apparatus to:
- obtain a first sample point in the wavelet signal sequence, wherein an audio intensity value of a sample point previous to the first sample point is less than the second audio intensity threshold, and an audio intensity value of the first sample point is greater than the second audio intensity threshold;
- obtain a second sample point in the wavelet signal sequence, wherein the second sample point is after the first sample point and is the first of sample points each having an audio intensity value less than the first audio intensity threshold in the wavelet signal sequence;
- and
- determine a signal of the sample points in the first audio signal corresponding to sample points from the first sample point to a sample point previous to the second sample point in the wavelet signal sequence as a valid voice segment in the valid voice signal.