A computer system having a control unit, a rounding circuit, and an ADPCM decoder. The control unit generates ADPCM sound data. The rounding circuits rounds a calculating value of the ADPCM sound data so that the ADPCM decoder reproduces original sound from the rounding value of the ADPCM...http://www.google.se/patents/US5845242?utm_source=gb-gplus-sharePatent US5845242 - Computer system for processing image and sound data
