[특허]Adaptive noise canceller

Adaptive noise canceller 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-015/00
출원번호	US-0070233 (1993-06-02)
우선권정보	JP-0142632 (1992-06-03); JP-0084311 (1993-04-12)
발명자 / 주소	Yoshida Tatsumasa (Tokyo JPX) Miyamoto Ryoichi (Tokyo JPX) Takada Masashi (Tokyo JPX) Suzuki Katsuya (Tokyo JPX)
출원인 / 주소	Oki Electric Industry Co., Ltd. (Tokyo JPX 03)
인용정보	피인용 횟수 : 102 인용 특허 : 0

초록 ▼

An adaptive filter estimates the noise component in a primary audio signal by convolving a secondary audio signal with a set of coefficients. The estimated noise component is subtracted from the primary audio signal to produce an output signal. During steady-state operation, the adaptive filter coefficients are updated as to minimize the difference between the primary audio signal and the estimated noise component. Steady-state operation is identified automatically by monitoring the power level of the primary or secondary audio signal, or the power level of the output signal. Coefficient updating is suspended when the monitored power level rises from a steady state to an unsteady state, and is resumed when the monitored power level returns to its previous steady-state level, or settles into a new steady state.

대표청구항 ▼

An adaptive noise canceler for using a secondary audio signal to remove noise from a primary audio signal, comprising: a first A/D converter for converting said primary audio signal to a primary digital input signal; a second A/D converter for converting said secondary audio signal to a secondary digital input signal; an adder coupled to said first A/D converter, for subtracting an estimated noise signal from said primary digital input signal to produce an error signal; a D/A converter coupled to said adder, for converting said error signal to an audio output signal; an adaptive filter coupled to said second A/D converter, for convolving said secondary digital input signal with a set of coefficients to generate said estimated noise signal, and updating said coefficients responsive to said error signal; and a power monitoring circuit coupled to said adder, for monitoring a power level of said error signal, and commanding said adaptive filter to update said coefficients according to said error signal when said power level does not exceed a threshold which is updated according to said power level, and commanding said adaptive filter not to update said coefficients when said power level exceeds said threshold.

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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Adaptive noise canceller 원문보기

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