Communications: electrical – Audible indication – Electronic
Patent
1994-10-31
1997-04-08
Hofsass, Jeffery
Communications: electrical
Audible indication
Electronic
34038471, 3403843, 446404, 446484, G08B 310
Patent
active
056191790
ABSTRACT:
A sound generator includes independent and identical generators for the left and right sound channels. In one embodiment, identical sound synthesizer ICs contain the same library of sound loops. By retarding one IC's RESET port, the two ICs will always begin to output sound at slightly different times. If both ICs are clocked at the same clock rate, a fixed time shift between the left and right channel loops produces a pseudo-stereo effect. If the ICs are clocked at slightly different rates, the time shift between channels can drift continuously, producing the effect of migrating sound having great depth and spatial separation. In a second embodiment, substantially identical white noise generators output the left and right sound channels. In one mode, a common sawtooth waveform modulates each channel producing a wide variation in pulsating wave sounds. In another mode, the user may manually modulate both channels. A preferred embodiment provides a sound generator that uses two synthesizer ICs and two white noise generators.
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patent: 4401975 (1983-08-01), Ferguson et al.
patent: 4558305 (1985-12-01), Black et al.
patent: 5145447 (1992-09-01), Goldfarb
patent: 5382188 (1995-01-01), Tomellini
Hofsass Jeffery
Sharper Image Corporation
Wu Daniel J.
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