US5754665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise Canceler
Assignee: NEC Corp
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Filing: 1997-06-20
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Granted: 1998-05-19
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Expires: 2017-06-20
Abstract
Abstract The object of the noise canceler of the present invention is to allow hands-free conversation from either of two microphones through a parallel construction having two noise cancelers using FIR adaptive filters. When microphone 2 (at the driver's seat) is used for conversation, microphone 3 (at the passenger seat) is used for collecting noise and a noise-reduced voice signal 105 is obtained by using FIR adaptive filter 14; and when microphone 3 is used for conversation, microphone 2 is used for collecting noise and a noise-reduced voice signal 104 is obtained using FIR adaptive filter 13. These two voice signals 104, 105 are added at adder 17 and the result outputted as voice output signal 103.
Inventors
- 👤 Yoshiaki Hosoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:39
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
198 words
An adaptive control noise canceler system for a voice communication installation having first and second spaced microphones (2,3), either of which may receive a voice input from a speaker or a background noise input, said system comprising: a) a first signal channel including, in series connection, a first A/D converter (11) having an input connected to the first microphone, a first FIR adaptive filter (13), and a first adder (15), b) a second signal channel including, in series connection, a second A/D converter (12) having an input connected to the second microphone, a second FIR adaptive filter (14), and a second adder (16), c) circuit means coupling an output of the first A/D converter to the second adder, and an output of the second A/D converter to the first adder, d) feedback means coupling an output of the first adder to an input of the first filter, and an output of the second adder to an input of the second filter, and e) a third adder (17) for combining the outputs of the first and second adders, f) wherein when the first microphone receives a voice input the second microphone serves as a noise detector, and vice versa.
Claim 2
Dependent Claim
198 words
An adaptive control noise canceler system for a voice communication installation having first and second spaced microphones (2,3), either of which may receive a voice input from a speaker or a background noise input, said system comprising: a) a first signal channel including, in series connection, a first A/D converter (11) having an input connected to the first microphone, a first FIR adaptive filter (13), and a first adder (15), b) a second signal channel including, in series connection, a second A/D converter (12) having an input connected to the second microphone, a second FIR adaptive filter (14), and a second adder (16), c) circuit means coupling an output of the first A/D converter to the second adder, and an output of the second A/D converter to the first adder, d) feedback means coupling an output of the first adder to an input of the first filter, and an output of the second adder to an input of the second filter, and e) a third adder (17) for combining the outputs of the first and second adders, f) wherein when the first microphone receives a voice input the second microphone serves as a noise detector, and vice versa.
Claim 3
Dependent Claim
27 words
A system according to claim 1, wherein the first and second microphones are disposed on a driver side and a passenger side of a motor vehicle, respectively.
Claim 4
Dependent Claim
24 words
A system according to claim 1, further comprising a D/A converter (18) having an input connected to an output of said third adder (17).
References Cited (Backward Citations)
US4672674A
Cited
US4589137A
Cited
JPH05191884A
Cited
US5471538A
Cited
US5473702A
Cited
US5500903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |