OPERATION CODE BOOK HAVING SIGNAL SELECTION PULSE AMPLITUDE FOR QUICKLY CODING VOICE

摘要

PURPOSE: An operation code book having a signal selection pulse amplitude for quickly coding a voice is provided to considerably reduce the complexity of code book search when encoding a voice signal. CONSTITUTION: A code book consists of a set of pulse amplitude/position combinations. Each of the pulse amplitude/position combinations defines L different positions. The code book includes both zero-amplitude pulses and non-zero-amplitude pulses assigned to respective positions(p=1,2,...L) of the combination. Each non-zero-amplitude pulse assumes at least one of q possible amplitudes. A pulse amplitude/position combination of one set associated with a voice signal is pre-selected from the code book. Only the pulse amplitude/position combination of one set is searched for encoding the voice signal, and the complexity of the search is reduced.