Tone generating circuit
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United States of America Patent
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May 19, 1998
Issued Date -
N/A
app pub date -
Oct 11, 1995
filing date -
Apr 30, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tone generating circuit for delivering power to a speaker modulated fourth harmonic audio square wave signal by its fundamental to produce a modulated audio signal within a selected frequency range. The tone generating circuit may be incorporated in a power delivering circuit that supplies a pulse width modulated audio signal to a speaker in one mode of operation, a fourth harmonic modulated audio signal in a second mode of operation, and a square wave audio signal in a third mode of operation.
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