Microphone with frequency pre-emphasis channel plate
First Claim
1. A frequency-compensated hearing aid microphone assembly for providing from incoming ambient sound a frequency-varying differential actuating pressure to a transducer-operating diaphragm comprising:
- a hollow housing having housing walls defining a main chamber therein;
a compliant diaphragm disposed to divide the interior of said main chamber into a first chamber on a first side of said diaphragm and a second chamber on the second side of said diaphragm;
transducing means responsive to the movement of said diaphragm for producing an electrical signal responsively to said movement;
acoustically isolating chamber partition means disposed in said first chamber between the central region of said diaphragm and one or more confronting inner walls of said first chamber to acoustically divide said first chamber into an excitation chamber confronting said central region of said diaphragm and one or more elongated inertance-forming transfer chambers peripheral thereto and having first and second ends;
input port means configured to deliver incoming ambient sound to said excitation chamber;
transfer chamber inlet port means acoustically communicating between said excitation chamber and said first ends of each said transfer chamber; and
transfer chamber outlet port means acoustically communicating between said second chamber and and a portion of each said transfer chamber remote from said first end thereof.
4 Assignments
0 Petitions
Accused Products
Abstract
A high frequency emphasis microphone particularly adapted to a hearing aid application provides a steeply rising frequency response characteristic relative to frequency, and has a low pass sonic attenuator for providing to the undriven side of the microphone diaphragm a sonic counterpressure which at low frequencies substantially cancels ambient sound pressure delivered to the driven side of the diaphragm, the attenuator reducing this counterpressure at elevated frequencies to provide accentuated high frequency response. The attenuator includes a pair of inertance-forming restricted passageways passing a portion of incoming sound to a bypass port leading to the undriven side of the diaphragm, the passageways being defined by a U-shaped plate disposed within a chamber confronting the driven side of the diaphragm.
64 Citations
8 Claims
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1. A frequency-compensated hearing aid microphone assembly for providing from incoming ambient sound a frequency-varying differential actuating pressure to a transducer-operating diaphragm comprising:
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a hollow housing having housing walls defining a main chamber therein; a compliant diaphragm disposed to divide the interior of said main chamber into a first chamber on a first side of said diaphragm and a second chamber on the second side of said diaphragm; transducing means responsive to the movement of said diaphragm for producing an electrical signal responsively to said movement; acoustically isolating chamber partition means disposed in said first chamber between the central region of said diaphragm and one or more confronting inner walls of said first chamber to acoustically divide said first chamber into an excitation chamber confronting said central region of said diaphragm and one or more elongated inertance-forming transfer chambers peripheral thereto and having first and second ends; input port means configured to deliver incoming ambient sound to said excitation chamber; transfer chamber inlet port means acoustically communicating between said excitation chamber and said first ends of each said transfer chamber; and transfer chamber outlet port means acoustically communicating between said second chamber and and a portion of each said transfer chamber remote from said first end thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification