Noise canceling improvement to stethoscope
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United States of America Patent
Stats
-
Jun 1, 1999
Grant Date -
N/A
app pub date -
Nov 3, 1997
filing date -
Nov 5, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stethoscope for reducing background noise comprising a housing having a receiver portion and an audio output means; the receiver portion having a plurality of noise ports; a microphone isolator located within the receiver portion; a noise canceling microphone having a front end and a back end enclosed by the microphone isolator; an acoustical tube having an acoustical waveguide connected to the microphone isolator for channeling an input signal; a chest piece having a sound diaphragm pickup for receiving the input sound and noise signal connected to acoustic tube to permit a pressure gradient noise porting placed at the back end of the microphone and internally behind the noise port.
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