Electrical audio signal processing systems and devices – Stethoscopes – electrical
Patent
1993-09-24
1996-09-17
Kuntz, Curtis
Electrical audio signal processing systems and devices
Stethoscopes, electrical
327553, A61B 704
Patent
active
055576818
ABSTRACT:
An electronic stethoscope includes a microphone mounted in a resilient collar in a hand-held case. The microphone is coupled to an active filter having independently and continuously adjustable bandwidth and center frequency. A switch bypasses the active filter when the user wishes to hear all of the sounds detected by the microphone. The controls for bandwidth and center frequency are located on one side of the case and can be manipulated by the hand holding the stethoscope. The volume or gain of the stethoscope is adjusted by a third control located on the one side of the stethoscope. The controls can be linear or rotary or combinations thereof. The output signal from the active filter passes through a filter having a frequency response inverse to that of the human ear, is amplified, and is coupled to headphones which plug into a socket on the rear of the case. The active filter is either a state variable filter or a Butterworth filter, has a maximum bandwidth of at least ten octaves, and is stable at all settings of the controls.
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Don Lancaster, Active Filter Cookbook, 1975, p. 162.
Kuntz Curtis
Lee Ping W.
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