Mechanically operable acoustic filter

Details Mechanically operable acoustic filter Mechanically operable acoustic filter

1978-06-19

1979-09-11

Tomsky, Stephen J.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

179180, A61B 702

Patent

active

041672232

ABSTRACT:
A mechanically operable acoustic filter for varying the acoustic spectrum of transmitted sound signals. Sound signals, e.g. from a patient's skin when the filter is incorporated into the chest piece of a stethoscope, are received at an inlet orifice which may or may not be provided with an outer diaphragm. A thin, preferably Mylar filtering diaphragm partitions the interior of the chest piece into two chambers communicating with respective inlet and outlet orifices and each other through a central opening in the filtering diaphragm in line with a central passageway in a tensioning member for the filtering diaphragm. The position of the tensioning member is adjustable by a knob disposed outside the chest piece between a first position in which all frequencies pass by way of the central opening and successive positions in which the diaphragm is correspondingly tensioned at the same time the free vibrating area thereof is reduced.

REFERENCES:
patent: 585525 (1897-06-01), Kellogg
patent: 1429664 (1922-09-01), Wood
patent: 1994008 (1935-03-01), Torrance, Jr.
patent: 2792902 (1957-05-01), Reichardt
patent: 3690404 (1972-09-01), Collins

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