Noise canceling improvement to stethoscope

Details Noise canceling improvement to stethoscope Noise canceling improvement to stethoscope

1997-11-03

1999-06-01

Lee, Ping

Electrical audio signal processing systems and devices

Stethoscopes, electrical

181131, 381357, A61B 704

Patent

active

059094958

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.

REFERENCES:
patent: 3314499 (1967-04-01), Blackman
patent: 5492129 (1996-02-01), Greenberger
patent: 5812678 (1998-09-01), Scalise et al.

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