Signal processing circuit for pyro/piezo transducer
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United States of America Patent
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-
Mar 9, 2004
Grant Date -
N/A
app pub date -
May 17, 2001
filing date -
May 17, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An adapter for interfacing a pyro/piezo sensor to a polysomnograph machine comprises a differential input amplifier coupled to receive the raw transducer signals from a PVDF film transducer to provide a requisite gain while rejecting common mode noise. The resulting amplified signal is filtered to separate the pyro signal from the piezo signal and the piezo signal is further applied to half-wave rectifier stages that function to remove baseline noise from the piezo signal before its being applied to a microphone channel of an existing PSG machine.
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