Electronic chime module and method
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United States of America Patent
Stats
-
May 27, 1997
Grant Date -
N/A
app pub date -
Mar 20, 1995
filing date -
Mar 20, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exponentially decaying chime sound is generated with a single tri-statable output pin from a microprocessor which is implemented using a single digital output pin line to create states of low, high and disconnect which are input to a control circuit for output to a speaker. Preferably, the control circuit comprises a low pass filter in series with a buffer. Preferably, the buffer is a Darlington transistor. Preferably, the speaker is an electro-mechanical device, alternatively it may be a piezo-resistive device. A method is disclosed for generating a desired audible chime signal with a chime generating circuit regulating a tri-statable output via a single pin of a microprocessor to approximately generate a desired signal frequency, and preferably includes regulating said tri-statable output to produce amplitude decay of the desired signal frequency over time.
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