公开(公告)号：US3626096A

公开(公告)日：1971-12-07

申请号：US3626096D

申请日：1969-02-24

Applicant: IBM

Inventor： MUENCH WALDEMAR KURT VON ,  ROTHAUSER ERNST H

IPC: G01L9/00 ,  G01L23/00 ,  H03M1/00 ,  H04R1/00 ,  H04R19/00 ,  H04R23/00

CPC classification number: H04R19/00 ,  G01L9/0072 ,  G01L23/00 ,  H03M1/26 ,  H04R1/005

Abstract: An arrangement for transforming mechanical or acoustical waves into digital electrical signals is disclosed. The arrangement includes a converter which in principle is a condenser microphone having a diaphragm which is flexible and electrically biased. Also included is a plurality of switching elements (FET''s) disposed in a stiff plate which forms a portion of the condenser microphone and arranged so that they are electrically actuated by the electric field associated with the diaphragm depending on the distance of the diaphragm from an individual switching element. Sampling circuits associated with each of the switching elements apply the outputs of the switching elements to a coding matrix and a binary output representative of the condition of the switching elements at any instant is provided. The arrangement of the switching elements along the radius of the diaphragm and the use of exclusive OR circuits in the sampling circuits are also disclosed.