DATA ORGANIZATIONAL SCHEME FOR ENHANCED SELECTION OF GAIN PARAMETERS FOR SPEECH CODING

A vector quantizer (VQ) table is arranged in increasing order with regard to a gc gain value (as may be represented by a prediction error energy En). The single stage VQ table is then organized into two-dimensional bins, with each bin arranged in increasing order of a gp gain value. A one-dimensional auxiliary scalar quantizer is constructed from the largest prediction error energy values from each bin. The prediction error energy values in the auxiliary scalar quantizer are arranged in increasing order of magnitude. In order to quantize input gain values, the auxiliary scalar table is searched for the best prediction error energy match. The VQ table bin corresponding to the best match in the auxiliary table is then searched for the best En and gp match. Nearby bins may also be searched for a more optimal combination. The selected best match is used to quantize the input gain values.