Efficient coding of the prediction residual

This paper presents an efficient method of coding the prediction residual using the technique of sub- band coding designed at the bit rate of 9600 bits/second. The energy of the prediction residual is used to distribute the bit allocation by subbands such that the perceptual criteria is enhanced by transitional information within the phoneme connections of speech by a technique that weights the energy based on a normalization factor. A three tier phoneme classification is derived from an energy study of the phonemes for the prediction residual. With this it is shown that speech intelligibility is enhanced in the coding scheme. An adequate indication of coder quality is described using various types of signal-to-noise ratios.