Adaptive incremental pulse code modulation method and device with pulse-code regulation function

This invention relates to an adaptive increment PCM method with code-width regulation function, which mainly sets a code-width regulator receiving compressed data at the input end of an adaptive increment modulator so that the modulator can utilize the reference code output by said regulator to regulate out more accurate increment values against the high distortion rate caused by ADPCM method limited by low compressed code to keep low distortion rate under low compressed code width to realize high compressed rate and correctness.