Two-channel programmable sound generator with volume control

Details Two-channel programmable sound generator with volume control Two-channel programmable sound generator with volume control

1996-01-26

1998-09-01

Isen, Forester W.

Electrical audio signal processing systems and devices

With mixer

381104, 84625, 84660, 84617, 84655, 327172, 375238, 341152, 370205, 370212, 370297, H04B 100

Patent

active

058021876

ABSTRACT:
Disclosed is a programmable sound generator for generating digital outputs of tone and noise signals used for producing computer sound effects. The programmable sound generator includes at least two channels generating digital output serving as either tone signal or noise signal. A mixer is used to process the outputs of the channels in a digital, time-sharing manner. A volume controller coupled to the mixer is used to control the volume of the sound in a digital pulse width modulation (PWM) manner. Also, the volume controller allows its output to become floating when the programmable sound generator is not in use so as to allow another sound generating means to share the same sound transducing means. In the programmable sound generator, the tone generation and the noise generation share the same hardware, which allows low-cost production of the programmable sound generator.

REFERENCES:
patent: 4632001 (1986-12-01), Suzuki
patent: 4992792 (1991-02-01), Mori et al.
patent: 5150415 (1992-09-01), Jaffee et al.
patent: 5231240 (1993-07-01), Lu
patent: 5442125 (1995-08-01), Hanzawa et al.
patent: 5592559 (1997-01-01), Takahashi et al.
"Digital Audio Mixer", Elektor, Jul./Aug. 1978, pp. 7-58.

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