Patent ID: 6161089
Filing Date: 2000-12-12
Classification: G10L

Abstract:
A method of encoding speech into a frame of bits, the method including:digitizing a speech signal into a sequence of digital speech samples;dividing the digital speech samples into a sequence of subframes, each of the subframes including multiple digital speech samples;estimating a set of speech model parameters for each subframe, wherein the speech model parameters include a set of spectral magnitude parameters that represent spectral magnitude information for the subframe;combining consecutive subframes from the sequence of subframes into a frame;jointly quantizing the spectral magnitude parameters from the consecutive subframes of the frame to produce a set of encoder spectral bits, wherein:the joint quantization includes forming predicted spectral magnitude parameters from quantized spectral magnitude parameters from a previous subframe;a subframe of the frame includes a number of spectral magnitude parameters that may vary from a number of spectral magnitude parameters in the previous subframe; andthe joint quantization accounts for any variation between the number of spectral magnitude parameters in the subframe of the frame and the number of spectral magnitude parameters in the previous subframe; andincluding the encoder spectral bits in a frame of bits.