Harmonic Vector Excitation Coding (HVXC) is a part
of the MPEG4 audio coding standard and is used to code narrowband (8 kHz sampling rate) speech at 2 or 4 kbits/sec. The 2 kbits/sec version is referred to as the base layer, and the 4 kbits/sec version as the enhanced layer. The coder also supports a variable rate mode at 1.2 to 1.7 kbits/sec. The coder is LP based, vector quantizes the spectral shape of the LP residual for voiced frames, and employs a CELP scheme (also referred to as vector excitation (VXC)) to encode the LP residual for unvoiced frames instead of synthesizing the unvoiced excitation with random noise. Streaming Machines currently offer licenses for 32 bit fixed point portable source code....view full
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