Tone signal generating apparatus having a low-pass filter for in

Details Tone signal generating apparatus having a low-pass filter for in Tone signal generating apparatus having a low-pass filter for in

1985-10-29

1989-03-28

Witkowski, Stanley J.

Music

Instruments

84DIG9, 84DIG10, 364723, 3647241, G10H 112, G10H 146

Patent

active

048153540

ABSTRACT:
A tone signal generating apparatus comprises a waveform memory in which a plurality of waveform data representing different waveforms but corresponding to a same tone name are stored. These different waveform data are sequentially read from the memory and are supplied to a digital low-pass filter which comprises a delay circuit and a multiplier connected to each other to form a feedback loop. The low-pass filter smoothes abrupt variation of the waveform data and outputs a smoothed waveform data thereby interpolating the different waveforms. A tone signal is produced in accordance with this smoothed waveform data.

REFERENCES:
patent: 4138915 (1979-02-01), Nagai et al.
patent: 4175463 (1979-11-01), Deutsch
patent: 4185529 (1980-01-01), Kitagawa
patent: 4267761 (1981-05-01), Deutsch
patent: 4348929 (1982-09-01), Gallitzendorfer
patent: 4548119 (1985-10-01), Wachi et al.
patent: 4641564 (1987-02-01), Okamoto
patent: 4679480 (1987-07-01), Suzuki

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