Signal processing apparatus and signal processing method
First Claim
1. A signal processing apparatus comprising:
- a first calculator to obtain phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones for each frequency in a certain frequency band, each of the two spectrum signals including frequency components;
a second calculator to obtain, for each frequency component of one spectrum signal of the two spectrum signals, a value representing a target signal likelihood dependent on a value of the frequency component, and to determine whether the frequency component includes noise on the basis of the value representing the target signal likelihood obtained for the frequency component; and
a filter to, when the second calculator determines that a respective frequency component includes noise, generate a synchronized spectrum signal by synchronizing the respective frequency component of one of the two spectrum signals to the respective frequency component of the other of the two spectrum signals by phase shifting on the basis of the phase difference obtained by the first calculator, and to generate a filtered spectrum signal by subtracting the synchronized spectrum signal from the other of the two spectrum signals or adding the synchronized spectrum signal to the other of the two spectrum signals.
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Abstract
There is provided a signal processing apparatus, for suppressing a noise, which includes a first calculator to obtain a phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones to estimate a sound source by the phase difference, a second calculator to obtain a value representing a target signal likelihood and to determine a sound suppressing phase difference range at each frequency, in which a sound signal is suppressed, on the basis of the target signal likelihood, and a filter. The filter generate a synchronized spectrum signal by synchronizing each frequency component of one of the two spectrum signals to each frequency component of the other of the two spectrum signals for each frequency when the phase difference is within the sound suppressing phase difference range and to generate a filtered spectrum signal.
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Citations
15 Claims
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1. A signal processing apparatus comprising:
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a first calculator to obtain phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones for each frequency in a certain frequency band, each of the two spectrum signals including frequency components; a second calculator to obtain, for each frequency component of one spectrum signal of the two spectrum signals, a value representing a target signal likelihood dependent on a value of the frequency component, and to determine whether the frequency component includes noise on the basis of the value representing the target signal likelihood obtained for the frequency component; and a filter to, when the second calculator determines that a respective frequency component includes noise, generate a synchronized spectrum signal by synchronizing the respective frequency component of one of the two spectrum signals to the respective frequency component of the other of the two spectrum signals by phase shifting on the basis of the phase difference obtained by the first calculator, and to generate a filtered spectrum signal by subtracting the synchronized spectrum signal from the other of the two spectrum signals or adding the synchronized spectrum signal to the other of the two spectrum signals.
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2. A signal processing apparatus for suppressing a noise comprising:
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a first calculator to obtain a phase difference between two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones and to estimate a sound source by the phase difference; a second calculator to obtain a value representing a target signal likelihood and to determine a sound suppressing phase difference range at each frequency, in which a sound signal is suppressed, on the basis of the target signal likelihood; and a filter to generate a synchronized spectrum signal by synchronizing each frequency component of one of the two spectrum signals to each frequency component of the other of the two spectrum signals for each frequency when the phase difference is within the sound suppressing phase difference range and to generate a filtered spectrum signal by subtracting the synchronized spectrum signal from the other of the two spectrum signals or adding the synchronized spectrum signal to the other of the two spectrum signals. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A signal processing method using two spectrum signals in a frequency domain transformed from sound signals received by at least two microphones, each of the two spectrum signals including frequency components, the method comprising:
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obtaining a phase difference between the two spectrum signals for each frequency in a certain frequency band; obtaining, for each frequency component of one spectrum signal of the two spectrum signals, a value representing a target signal likelihood dependent on a value of the frequency component; determining, for each frequency component of said one spectrum signal of the two spectrum signals, whether the frequency component includes noise on the basis of the value representing the target signal likelihood obtained for the frequency component; and when said determining determines that a respective frequency component includes noise, generating a synchronized spectrum signal by synchronizing the respective frequency component of one of the spectrum signals to the respective frequency component of the other of the spectrum signals by phase shifting on the basis of the obtained phase difference, and generating a filtered spectrum signal by subtracting the synchronized spectrum signal from the other of the spectrum signals or adding the synchronized spectrum signal to the other of the spectrum signals.
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Specification