Phoneme recognition and difference signal for speech coding/decoding

摘要

An analog-to-digital converter (20) forms a digital signal based upon an analog speech signal. A phoneme parser (22) parses the digital signal into at least one phoneme. A phoneme recognizer (24) assigns a symbolic code to each phoneme based upon recognition of the phonemes from a predetermined set. A read-only memory (34) contains a standard waveform representation of each phoneme from the predetermined set. A difference processor (32) forms a difference signal between a user-spoken phoneme waveform and a corresponding waveform from the read-only memory (34). The difference signal is stored in a storage device (40). A multiplexer (30) provides a bit stream signal based upon the symbolic code and the difference signal. A synchronizer (70) extracts the symbolic code and the difference signal from the bit stream. A phoneme generator (76) forms the speech signal based upon the symbolic code and the difference signal.