Unidirectional microphone
AssigneeKnowles Electronics, LLC
InventorTimothy K. Wickstrom
Life of this patent
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Abstract
A unidirectional microphone assembly for receiving sound within a range of sound frequencies is disclosed. The microphone assembly comprises a housing formed of a sound absorbing material. The housing has an outer surface, and a bore extending inwardly along a bore axis from the outer surface to form a chamber within the housing. The microphone assembly further comprises a directional microphone having an axis of maximum reception. The microphone is disposed within the chamber and positioned with its axis of maximum reception directed outwardly substantially along the bore axis.
Claims35
A unidirectional microphone assembly for receiving sound within a range of sound frequencies, the microphone assembly comprising:
- a housing formed of a sound absorbing material, said housing having an outer surface, and a bore extending inwardly along a bore axis from said outer surface to form a chamber within said housing;
- and
- a directional microphone having an axis of maximum reception, said microphone disposed within said chamber and positioned with its axis of maximum reception directed outwardly substantially along said bore axis.
A unidirectional microphone assembly for receiving sound within a range of sound frequencies, the microphone assembly comprising:
- a housing formed exclusively of a closed cell, polyurethane foam, said housing having an outer surface, and a tapered bore extending inwardly along a bore axis from said outer surface to form a chamber within said housing;
- and
- a cardioid-type directional microphone having an axis of maximum reception, said microphone disposed within said chamber and positioned with its axis of maximum reception directed outwardly substantially along said bore axis.
A unidirectional microphone assembly for receiving sound within a range of sound frequencies, the microphone assembly comprising:
- a generally cubic housing formed exclusively of a closed cell, polyurethane foam, said housing having an outer surface, and a tapered bore extending inwardly along a bore axis from said outer surface to form a chamber within said housing;
- and
- a cardioid-type directional microphone having an axis of maximum reception, said microphone disposed within said chamber and positioned with its axis of maximum reception directed outwardly substantially along said bore axis.
A unidirectional microphone assembly for receiving sound within a range of sound frequencies, the microphone assembly comprising:
- a generally cubic housing formed exclusively of a closed cell polyurethane foam, said housing having a thickness of at least 1/4 wavelength of the frequencies within said range of frequencies, said housing having an outer surface, and a frustoconically tapered bore extending inwardly along a bore axis at an angle of substantially 120.degree. relative to said microphone, from said outer surface to form a chamber within said housing;
- and
- a super-cardioid-type directional microphone having an axis of maximum reception, said microphone disposed within said chamber and positioned with its axis of maximum reception directed outwardly substantially along said bore axis.
Dependencies are inferred from the claim text.