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The CCITT has adopted a Standard for a tandemable 64 kbit/s pulse code modulation (PCM) 32 kbit/s adaptive differential pulse code modulation (ADPCM) transcoder algorithm , . This correspondence suggests slight changes in the adaptive quantizer and prediction filter which facilitate microprocessor realization while potentially improving performance. These variations are then incorporated into a real-time hardware and software system based on a single TI TMS 32010 each for the encoder and decoder. Objective and subjective results on the performance of our design are also presented.