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EP0729288A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Noise canceler

Assignee: NEC Corp
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Filing: 1996-02-16
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Granted: —
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Expires: 2016-02-16
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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 NEC Saitama Ltd. Hosoi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 15:03
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/005

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 124 words
An adaptive control noise canceler that suppresses a background noise component arising from travel of a mobile body that is acoustically interfered to a voice signal, comprising: a first noise canceler that uses an FIR (Finite Impulse Response) adaptive filter that takes as input signals voice signals outputted when a first microphone is used by a speaker and noise signals outputted when a second microphone is used for noise collection; a second noise canceler that uses an FIR adaptive filter that takes as input signals noise signals outputted when said first microphone is used for noise collection and voice signals outputted when said second microphone is used by a speaker; and an adder that adds output signals of said first and second noise cancelers.
Claim 2
Dependent Claim 202 words
An adaptive control noise canceler that suppresses a background noise component arising from travel of a mobile body that is acoustically interfered to a voice signal, comprising: first and second A/D converters that convert voice signals or noise signals from first and second microphones, respectively, to digital signals; a first FIR adaptive filter that generates and outputs from output signals of said second A/D converter noise signals that are mutually correlative with voice signals from said first microphone when said first microphone is used for voice and said second microphone is used for noise; a second FIR adaptive filter that generates and outputs from output signals of said first A/D converter noise signals that are mutually correlative with voice signals from said second microphone when said first microphone is used for noise and said second microphone is used for voice; a first adder that adds noise signals from said first FIR adaptive filter and voice signals from said first microphone; a second adder that adds noise signals of said second FIR adaptive filter and voice signals from said second microphone; and a third adder that adds output signals of said first and second adders and outputs the result as an output signal.

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