Noise reduction device and noise reduction method
AssigneeDENSO TEN Limited
InventorMasaaki TAIRA
Life of this patent
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Abstract
A noise reduction device according to an aspect of an embodiment includes a detection unit, a calculation unit, and a reduction unit. The detection unit detects frequency components of a plurality of noise signals that are included in a received signal, based on a frequency spectrum of the received signal. The calculation unit calculates a coefficient, based on the frequency components that are detected by the detection unit. The reduction unit reduces n noise signals that are at least a part of the plurality of noise signals from the received signal, depending on the coefficient that is calculated by the calculation unit (where n is a positive number that is greater than or equal to 2).
Claims8
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A noise reduction device, comprising:
- a detection unit that detects frequency components of a plurality of noise signals that are included in a received signal, based on a frequency spectrum of the received signal;
- a calculation unit that calculates a coefficient, based on the frequency components that are detected by the detection unit;
- and
- a reduction unit that reduces n noise signals that are at least a part of the plurality of noise signals from the received signal, depending on the coefficient that is calculated by the calculation unit, where n is a positive number that is greater than or equal to 2,
- wherein
- the detection unit detects signal levels of the n noise signals;
- the calculation unit includes
- a coefficient calculation unit that calculates the coefficient in a frequency domain, based on the frequency components and the signal levels that are detected by the detection unit, and
- a transformation unit that transforms the coefficient in a frequency domain that is calculated by the coefficient calculation unit into the coefficient in a time domain;
- and
- the reduction unit reduces the n noise signals from the received signal, in a time domain, depending on the coefficient in a time domain that the transformation unit transforms the coefficient in a frequency domain into.
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A noise reduction method, comprising:
- detecting frequency components of a plurality of noise signals that are included in a received signal, based on a frequency spectrum of the received signal;
- calculating a coefficient, based on the detected frequency components;
- and
- reducing n noise signals that are at least a part of the plurality of noise signals from the received signal, depending on the calculated coefficient, where n is a positive number that is greater than or equal to 2,
- wherein
- the detecting includes detecting signal levels of the n noise signals;
- the calculating includes
- calculating the coefficient in a frequency domain, based on the detected frequency components and the detected signal levels, and
- transforming the calculated coefficient in a frequency domain into the coefficient in a time domain;
- and
- the reducing reduces the n noise signals from the received signal, in a time domain, depending on the coefficient in a time domain that the coefficient in a frequency domain is transformed into.
Dependencies are inferred from the claim text.