Method of and device for quantizing excitation gains in speech c

Details Method of and device for quantizing excitation gains in speech c Method of and device for quantizing excitation gains in speech c

1993-10-12

1996-05-21

MacDonald, Allen R.

395 229, 395 239, G10L 900

Patent

active

055198074

ABSTRACT:
An optimum excitation signal for each subframe is determined in a speech coder based on analysis-by-synthesis techniques and operating on frames of samples divided into a number of subframes. The excitation signal includes a shape contribution (innovation) and an amplitude contribution (gain) which are quantized separately. A circuit (IT) for gain quantization includes means (QU) for determining a gain index for each subframe; a comparison logic network (CFR) for detecting the maximum value taken by the gain index in the frame; and means for computing a normalized index for each subframe as a difference between the maximum index and the gain index relevant to that subframe. The coded signal includes the coded values of the maximum index and of the normalized indexes as information on the gain relevant to a frame.

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