Patent ID: 6242681
Filing Date: 2001-06-05
Classification: G10H

Abstract:
A waveform reproduction device comprising:a memory that stores compressed waveform samples based on a predetermined data compression scheme;a phase generator that generates, every sampling cycle, progressive phase information varying in accordance with a tone pitch to be reproduced;a readout controller that sequentially reads out the compressed waveform samples from said memory on the basis of the phase information generated by said phase generator, said readout controller controlling readout of the compressed waveform samples so as to provide successive compressed waveform samples from the compressed waveform sample corresponding to the phase information generated in a last sampling cycle to the compressed waveform sample corresponding to the phase information generated in a current sampling cycle;a compression decoder that decodes each of the compressed waveform samples read out from said memory using a predetermined prediction value;a buffer that supplies said compression decoder with a previously decoded waveform sample as the predetermined prediction value, to thereby allow said compression decoder to decode all the compressed waveform samples read out from said memory; andan output section that selects and outputs, from among the waveform samples decoded by said compression decoder, a decoded waveform sample corresponding to the phase information of the current sampling cycle.