Patent ID: 11270714

Abstract:
Encoding a sequence of digital speech samples into a bit stream includes dividing the digital speech samples into frames including N subframes (where N is an integer greater than 1); computing model parameters for the subframes, the model parameters including spectral parameters; and generating a representation of the frame. The representation includes information representing the spectral parameters of P subframes (where P is an integer and P<N) and information identifying the P subframes. The representation excludes information representing the spectral parameters of the N−P subframes not included in the P subframes. Generating the representation includes selecting the P subframes by, for multiple combinations of P subframes, determining an error induced by representing the frame using the spectral parameters for the P subframes and using interpolated spectral parameter values for the N−P subframes, where the interpolated spectral parameter values are generated by interpolating using the spectral parameters for the P subframes. A combination of P subframes is selected based on the determined error for the combination of P subframes.