Apparatus for producing a plurality of audio sound effects
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United States of America Patent
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-
Feb 2, 1982
Issued Date -
N/A
app pub date -
Jan 24, 1979
filing date -
Jan 12, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for producing a plurality of audio sound effects such as shots, explosions, and airplane and car sounds, used in electronic games utilizes a variable clock driving a variable digital noise generator whose audio output amplitude is shaped by either of two types of control units. In one type the density or duty cycle is varied by selectively ANDing together outputs from a polynomial counter. In a second embodiment a digital to analog converter utilizing gated resistive summing provides the amplitude control the gates being driven by a four bit data register which in turn is driven by the game control means.
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