Cellular radiotelephone having answering machine/voice memo capability with parameter-based speech compression and decompression

摘要

A method for speech encoding and decoding usable in a Digital Telephone Answering Machine/Voice Memo for a cellular radiotelephone is provided. The apparatus uses parameter-based speech compression and decompression modules. These modules perform decimation of standard-type speech parameter frames before storing the message, and interpolation before playing the message, in order to substantially reduce the number of parameter bits in parameter frames of the stored speech signal. The result is a decreased demand for storage space and increased speed of speech compression and decompression.