ADPCM CODEC CIRCUIT USING DSP

摘要

The adaptive differential pulse code modulation (ADPCM) coding and decoding (CODEC) circuit comprises a filter codec (A) for modulating analog audio signal to 8 bit PCM signal, a shift logic circit (B) for converting PCM data serial/parallel and parallel/serial form, a buffer (C) for storing the data temporarily, an encoder (D) for encoding the data stored in the buffer, a channel decodr (E) including data selectors (U7, U8), a control circuit (F) for providing control signal for encoding and decoding, a decoder (G) for providing parallel PCM data, and a clock generator (H) for providing clock pulse to A, B, C, D, G and F circuits.