NOISE ESTIMATION APPARATUS, CALLING APPARATUS, AND NOISE ESTIMATION METHOD
First Claim
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1. A noise estimation apparatus comprising:
- a microphone that converts sound into an electric signal and outputs the electric signal as a sound signal; and
a noise estimator that performs estimation for estimating a magnitude of a noise component contained in the sound signal so as to generate an estimated noise signal,wherein the noise estimator limits a minimum value of a noise level of the noise component contained in the sound signal during the estimation to a predetermined default value, and integrates the noise level having the limited minimum value to generate the estimated noise signal.
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Abstract
In a noise estimation apparatus, a microphone converts sound into an electric signal and outputs the electric signal as a sound signal. A noise estimator performs estimation for estimating a magnitude of a noise component contained in the sound signal so as to generate an estimated noise signal. The noise estimator limits a minimum value of a noise level of the noise component contained in the sound signal during the estimation to a predetermined default value, and integrates the noise level having the limited minimum value to generate the estimated noise signal.
6 Citations
9 Claims
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1. A noise estimation apparatus comprising:
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a microphone that converts sound into an electric signal and outputs the electric signal as a sound signal; and a noise estimator that performs estimation for estimating a magnitude of a noise component contained in the sound signal so as to generate an estimated noise signal, wherein the noise estimator limits a minimum value of a noise level of the noise component contained in the sound signal during the estimation to a predetermined default value, and integrates the noise level having the limited minimum value to generate the estimated noise signal. - View Dependent Claims (2, 3, 4, 5)
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6. A calling apparatus comprising:
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a microphone that converts sound into an electric signal and outputs the electric signal as a sound signal; a noise estimator that performs estimation for estimating a magnitude of a noise component contained in the sound signal so as to generate an estimated noise signal, wherein the noise estimator limits a minimum value of a noise level of the noise component contained in the sound signal during the estimation to a predetermined default value, and integrates the noise level having the limited minimum value to generate the estimated noise signal; and a sound emphasis processor that applies emphasis processing to a transmission voice to be transmitted from the calling apparatus or a reception voice to be received by the calling apparatus by an emphasis amount corresponding to the magnitude of the estimated noise signal. - View Dependent Claims (7, 8)
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9. A noise estimation method, comprising:
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a first step of generating a sound signal by converting sound into an electric signal and outputting the electric signal as the sound signal; and a second step of generating an estimated noise signal by performing estimation for estimating a magnitude of a noise component contained in the sound signal, wherein the second step limits a minimum value of a noise level of the noise component contained in the sound signal during the estimation to a predetermined default value, and generates the estimated noise signal by integrating the noise level having the limited minimum value.
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Specification