Directional microphone assembly
First Claim
1. A microphone capsule for an in-the-ear hearing aid, comprising:
- A. a top plate defining an exterior portion of said capsule as worn, said top plate having first and second spaced openings defining front and rear sound inlets, said top plate generally defining a plane;
B. a directional microphone cartridge comprising a directional microphone cartridge housing and a diaphragm mounted within said directional microphone cartridge housing, said diaphragm being oriented generally perpendicular to said top plate and dividing said directional microphone cartridge housing into a front chamber and a rear chamber, said directional microphone cartridge housing having a pair of opposed walls extending generally perpendicular to said top plate;
C. a front sound passage communicating between said front sound inlet and said front chamber; and
D. a rear sound passage communicating between said rear sound inlet and said rear chamber, said pair of opposed walls having a front opening communicating between said front sound passage and said front chamber and a rear opening communicating between said rear sound passage and said rear chamber, said front and rear opening dividing said pair of opposed walls into a longer upper portion and a shorter lower portion.
3 Assignments
0 Petitions
Accused Products
Abstract
A microphone capsule for an in-the-ear hearing aid is disclosed. The capsule can include a top plate having first and second spaced openings defining front and rear sound inlets, and a directional microphone cartridge enclosing a diaphragm. The diaphragm is oriented generally perpendicular to the top plate and divides the directional microphone cartridge housing into a front chamber and a rear chamber. A front sound passage communicates between the front sound inlet and the front chamber, and a rear sound passage communicates between the rear sound inlet and the rear chamber. Front and rear acoustic damping resistors having different resistance values are associated with the front and rear sound passages. The acoustic resistor pair provides a selected time delay, such as about 4 microseconds, between the front and rear sound passages. The use of two acoustic resistors instead of one levels the frequency response, compared to the frequency response provided by a rear acoustic damping resistor alone.
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Citations
6 Claims
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1. A microphone capsule for an in-the-ear hearing aid, comprising:
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A. a top plate defining an exterior portion of said capsule as worn, said top plate having first and second spaced openings defining front and rear sound inlets, said top plate generally defining a plane; B. a directional microphone cartridge comprising a directional microphone cartridge housing and a diaphragm mounted within said directional microphone cartridge housing, said diaphragm being oriented generally perpendicular to said top plate and dividing said directional microphone cartridge housing into a front chamber and a rear chamber, said directional microphone cartridge housing having a pair of opposed walls extending generally perpendicular to said top plate; C. a front sound passage communicating between said front sound inlet and said front chamber; and D. a rear sound passage communicating between said rear sound inlet and said rear chamber, said pair of opposed walls having a front opening communicating between said front sound passage and said front chamber and a rear opening communicating between said rear sound passage and said rear chamber, said front and rear opening dividing said pair of opposed walls into a longer upper portion and a shorter lower portion. - View Dependent Claims (2, 3, 4)
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5. A microphone capsule for an in-the-ear hearing aid, comprising:
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A. a top plate defining an exterior portion of said capsule as worn, said top plate having at least one spaced opening defining at least one sound inlet, said at least one spaced opening having a shoulder defined by a surface dividing the at least one spaced opening into at least two portions having different diameter dimensions; B. a microphone cartridge comprising a microphone cartridge housing and a diaphragm mounted within said microphone cartridge housing, said diaphragm dividing said microphone cartridge housing into first and second chambers; and C. at least one tubing having a sealing end and defining at least one sound passage, said at least one sound passage communicating between said at least one sound inlet and at least one of said first and second chambers, said top plate receiving said at least one tubing in said at least one spaced opening such that the sealing end of the at least one tubing abuts the shoulder of the at least one spaced opening providing a mechanical stop for the at least one tubing for ease of assembly of the microphone capsule. - View Dependent Claims (6)
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Specification