Music – Instruments – Electrical musical tone generation
Patent
1991-02-05
1992-07-07
Evans, Geoffrey S.
Music
Instruments
Electrical musical tone generation
G10H 704
Patent
active
051273020
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 readout has a single frequency and accordingly a single period. The waveform reading period is devided 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.
REFERENCES:
patent: 4442748 (1984-04-01), Kaneko et al.
patent: 4537108 (1985-08-01), Shiromizu
Katsui Masami
Terashima Yoshiyuki
Evans Geoffrey S.
Seiko Epson Corporation
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