PROTECTION OF ENERGY INFORMATION IN SUB-BAND CODING

摘要

An encoding system for transmission and reception of speech signals and utilizing sampling, filtering (12) and sub-band coding (14) techniques for reduction of the bit rate. The energy levels of each sub-band are determined with respect to the band having the maximum energy level. The energy level information is encoded and divided into protected and unprotected bits. Only the protected bits are used for the determination of the bit allocation of the sample information, but both protected and unprotected bits are utilized in reconstituting the original levels of the bands.