Noise cancellation apparatus
First Claim
1. A telephone handset apparatus having a speaker portion and a receiver portion for use with a telephone unit operable by standard power supplied from said telephone unit for transmitting and receiving signals representing speech between two or more operators, said apparatus comprising:
- a housing in the receiver portion having first microphone means for receiving a first acoustic sound composed of speech from the operator using said apparatus and background noise in the vicinity of said speech and for converting said first acoustic sound to a first signal, and second microphone means arranged at a predetermined angle φ
with respect to said first microphone means, and adjacent thereto, for receiving a second acoustic sound composed of substantially said background noise and for converting said second acoustic sound to a second signal; and
means for subtracting said second signal from said first signal so as to obtain a signal representing substantially said speech.
2 Assignments
0 Petitions
Accused Products
Abstract
Apparatus for reducing acoustic background noise for use with a telephone handset or a boom microphone device or the like. The apparatus includes first and second microphones which are arranged such that the first microphone receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone receives substantially only the background noise. The background noise from the second microphone is converted into a corresponding electrical signal and subtracted from a signal corresponding to the speech and background noise obtained from the first microphone so as to produce a signal representing substantially the speech.
123 Citations
28 Claims
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1. A telephone handset apparatus having a speaker portion and a receiver portion for use with a telephone unit operable by standard power supplied from said telephone unit for transmitting and receiving signals representing speech between two or more operators, said apparatus comprising:
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a housing in the receiver portion having first microphone means for receiving a first acoustic sound composed of speech from the operator using said apparatus and background noise in the vicinity of said speech and for converting said first acoustic sound to a first signal, and second microphone means arranged at a predetermined angle φ
with respect to said first microphone means, and adjacent thereto, for receiving a second acoustic sound composed of substantially said background noise and for converting said second acoustic sound to a second signal; andmeans for subtracting said second signal from said first signal so as to obtain a signal representing substantially said speech. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 27)
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14. Apparatus for use with a telephone handset having a speaker portion and a receiver portion for reducing acoustical noise, said apparatus comprising:
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a housing in the receiver portion having first microphone means for receiving a first acoustic sound composed of speech from an operator using said telephone handset and background noise in the vicinity of said speech and for converting said first acoustic sound to a first signal, and second microphone means arranged at a predetermined angle φ
with respect to said first microphone means, and adjacent thereto, for receiving a second acoustic sound composed of substantially said background noise and for converting said second acoustic sound to a second signal; andmeans for subtracting said second signal from said first signal so as to obtain a signal representing substantially said speech. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28)
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Specification