Noise Eliminating Apparatus
First Claim
1. A noise eliminating apparatus comprising a first microphone, a second microphone and a signal processing unit, wherein:
- the signal processing unit includes a linear prediction filter and a noise resynthesis filter;
the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal; and
the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.
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Accused Products
Abstract
A noise eliminating apparatus includes a first microphone, a second microphone and a signal processing unit, the signal processing unit includes a linear prediction filter and a noise resynthesis filter, the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal, and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized.
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Citations
4 Claims
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1. A noise eliminating apparatus comprising a first microphone, a second microphone and a signal processing unit, wherein:
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the signal processing unit includes a linear prediction filter and a noise resynthesis filter; the linear prediction filter receives an output signal of the first microphone, predicts the output signal of the first microphone by linear prediction and generates a prediction signal; and the noise resynthesis filter is an adaptive filter which receives, as a main input signal, a first difference signal obtained by subtracting one of the output signal of the first microphone and the prediction signal from the other, receives, as an error signal, a second difference signal obtained by subtracting one of an output signal of the second microphone and an output signal of the noise resynthesis filter itself from the other, and updates a filter coefficient so that the error signal is minimized. - View Dependent Claims (2, 3, 4)
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Specification