Method of expanding differential PCM data of speech signals

摘要

During expansion of differential pulse code modulation PCM data into (PCM) data, particularly for speech data in data processing, the range of oscillation of the PCM data can be centered about an amplitude level when each current PCM value has a small value DELTA subtracted from it or added to it when respectively positive or negative to obtain a corrected current PCM sample value. Even if manipulation involved in data editing, such as division or connection, of differential or expanded PCM data has been performed or if an error has occurred during transmission of differential PCM data to produce an offset, such offset can be quickly corrected during the expansion.