Noise suppressing apparatus
First Claim
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1. A noise suppressing apparatus comprising:
- a noise reduction device for estimating a spectrum of a surrounding noise only when an input signal is soundless and for performing a spectrum subtraction of the input signal based on the estimated noise spectrum;
a noise reduction execution determiner for estimating a signal noise ratio from the input signal and for determining whether or not the signal noise ratio is equal to or more than a threshold value; and
a switch portion for selecting an output signal of the noise reduction device based on an output signal of the noise reduction execution determiner only when the signal noise ratio is equal to or more than the threshold value and for selecting the input signal otherwise.
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Abstract
In an apparatus which estimates characteristics of a surrounding noise only when an input signal is soundless and performs a noise reduction or suppression of the input signal based on the estimated result, a signal noise ratio is estimated from the input signal, and an automatic switch or an automatic adjustment is performed so as to execute a noise reduction only when the signal noise ratio is good, otherwise to avoid the noise reduction or make the noise reduction degree smaller.
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Citations
11 Claims
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1. A noise suppressing apparatus comprising:
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a noise reduction device for estimating a spectrum of a surrounding noise only when an input signal is soundless and for performing a spectrum subtraction of the input signal based on the estimated noise spectrum;
a noise reduction execution determiner for estimating a signal noise ratio from the input signal and for determining whether or not the signal noise ratio is equal to or more than a threshold value; and
a switch portion for selecting an output signal of the noise reduction device based on an output signal of the noise reduction execution determiner only when the signal noise ratio is equal to or more than the threshold value and for selecting the input signal otherwise. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A noise suppressing apparatus comprising:
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a noise reduction device for estimating a spectrum of a surrounding noise only when an input signal is soundless and for performing a spectrum subtraction of the input signal based on the estimated noise spectrum; and
a reduction intensity calculator for calculating a noise reduction intensity from a power of the input signal to be multiplied to the estimated noise spectrum. - View Dependent Claims (8, 9, 10, 11)
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Specification