Asynchronous waveform generating device for use in an electronic

Details Asynchronous waveform generating device for use in an electronic Asynchronous waveform generating device for use in an electronic

1991-03-20

1994-03-01

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

364723, 36472402, G10H 704

Patent

active

052909654

ABSTRACT:
A waveform generating device applicable to musical tone generating circuitry employed in electronic musical instruments is disclosed. The device digitally stores sampled waveform data. The data is read out and the musical tone having a different pitch is generated according to a pitch-sampling rate asynchronous system. The device includes a storing device which stores sampled waveform data, pitch designation device which outputs a signal indicating the pitch of a musical tone to be generated, readout device which successively reads out the waveform data at a speed which is determined based on the signal, an interpolation device which creates intermediate data, corresponding to a value which exists between two continuous sample data which are read out by device of the readout device, by means of interpolation calculation, and outputs the intermediate data at a fixed sampling cycle, a beginning readout designation device which designates beginning of readout in the readout device, and a readout speed control device, which sets readout speed of the readout device to a faster speed than the speed determined based on the pitch signal for a predetermined period following the designation of the beginning of readout by the beginning readout designation device.

REFERENCES:
patent: 4246823 (1981-01-01), Wachi et al.
patent: 4561337 (1985-12-01), Wachi
patent: 4612838 (1986-09-01), Nagashima et al.
patent: 4785706 (1988-11-01), Toshifumi
patent: 4901615 (1990-02-01), Matsushima et al.
patent: 4916996 (1990-04-01), Suzuki et al.

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