Device and method for reading sound waveform data

Abstract

A device for reading sound waveform data has a waveform ROM for storing waveform data represented as an amplitude in a time series. Sound waveform data is repeatedly read from the waveform ROM. The reading of a single waveform corresponds to a single period. A scale ROM stores a plurality of frequency dividing ratios. A programmable counter divides a signal having a predetermined frequency in correspondence with a frequency dividing ratio output by the scale ROM and outputing a clock pulse. A counter counts the clock pulses and indicates the addresses of the waveform ROM. The scale ROM changes the frequency dividing ratio data during an arbitrary divided period of intervals in the period for reading the waveform data. During the period for reading the waveform by the counters, the sound waveform read out has a single frequency and accordingly a single period. The waveform reading period is divided into m number of intervals. A particular kth divided period interval between 0 and m is adjusted to a longer or shorter interval than the remaining m-1 period intervals to allow fine adjustment of an average period improving overall period resolution capabilities.

Dependencies are inferred from the claim text.