Electrical audio signal processing systems and devices – Sound effects
Patent
1989-05-01
1990-06-12
Isen, Forester W.
Electrical audio signal processing systems and devices
Sound effects
H03G 300
Patent
active
049339800
ABSTRACT:
A sound effects generator including a pair of digitally programmable sound generators, each of which is independently and dynamically controlled by a programmed digital signal processor through a control logic interface. Each programmable sound generator includes three intermediate signal channels providing respective digital noise and tone signals. Each intermediate signal channel, moreover, includes a mixer for blending the respective noise and tone signals as desired. Each intermediate channel output is also individually shaped or modulated by one of a plurality of distinct waveforms which digitally control the amplitude period and/or frequency thus generating an envelope of noise and/or sound to produce a particular sound or audible effect which is then converted to an analog output. The three analog outputs of the intermediate signal channels of the two sound generators are then respectively mixed to provide two separate composite analog outputs of sound which can be dynamically altered separately through control of a signal processor comprised of a digital microprocessor or microcomputer.
REFERENCES:
patent: 4437377 (1984-03-01), Mitarai et al.
patent: 4628789 (1986-12-01), Fujimori
patent: 4643066 (1987-02-01), Oya
patent: 4685134 (1987-08-01), Wine
Microelectronics Data Catalog (1982), General Instruments Corporation, "Prammable Sound Generator", pp. 5-18 through 5-25.
Elbaum Saul
Isen Forester W.
The United States of America as represented by the Secretary of
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