LOW-DELAY-CODE EXCITING-WIRE TYPE PREDICTION ENCODING FOR SPEECH IN 32 KB/S WIDE BAND

摘要

PURPOSE: To efficiently encode and decode a signal including a speech by a method which communicates parameters of indexes of information over a com munication channel according to an input sequence by including a parqeter on which frequency correction of input information is reflected in parameters and making frequency corrections so that amplitude correction of specific fre quency and the total spectrum gradient are reflected. CONSTITUTION: The low-delay code excitation line type prediction (LD-CELP) proposed here to encode a 32 Kb/s wide-band speech preferably uses inverse LPC. The wide-band speech has data made unorganized to high level at a high frequency and the spectrum dynamic range is high, so it is difficult to encode it. The figure shows frequency response corrected as a result of the application of a typical practicing state.