US 8,428,275 B2 · Wind noise reduction device

Abstract

In a wind noise reduction device that reduces wind noise contained in an input sound signal to generate a corrected sound signal, when a predetermined band including the band of the wind noise is a first band and a predetermined band higher in frequency than the first band is a second band, the wind noise reduction device includes: a first corrector that has a signal generator generating, based on a sound signal (i) contained in the input sound signal and lying in a band higher in frequency than the first band, a sound signal (ii) lying in the first band and different from a sound signal (iii) contained in the input sound signal and lying in the first band, and that generates a first corrected sound signal based on the sound signal (ii) generated by the signal generator; a second corrector that reduces the signal level of a sound signal (iv) contained in the input sound signal and lying in the second band to thereby generate a second corrected sound signal as a sound signal (v) having the wind noise reduced and lying in the second band; and a corrected sound signal outputter that outputs the corrected sound signal based on the first and second corrected sound signals.

Claims19

Dependent claims

A wind noise reduction device for reducing wind noise contained in an input sound signal by utilizing a sound signal lying in a first band and a sound signal lying in a second band which is higher in frequency than the first band,

comprises:
a first corrector, which generates a first corrected sound signal based on a first sound signal, comprising:
a signal generator which generates the first sound signal lying in the first band based on a second sound signal which lies in the second band and is contained in the input sound signal,
wherein the first sound signal is different from a third sound signal which lies in the first band and is contained in the input sound signal;
a second corrector which generates a second corrected sound signal, lying in the second band, by reducing a signal level of a forth sound signal which lies in the second band and is contained in the input sound signal;
and
a corrected sound signal outputter which outputs a corrected sound signal based on the first corrected sound signal and second corrected sound signal.

4 more elements

A wind noise reduction device which receives an input sound signal composed of a plurality of channel signals acquired by a plurality of microphones, and which reduces wind noise contained in the input sound signal, the wind noise reduction device comprising:

a wind noise checker
which divides a predetermined band included in an entire frequency band of the input sound signal into n sub-bands (where n is an integer of 2 or more), and
which calculates, for each sub-band, a correlation value indicating cross-correlation between the plurality of channel signals to thereby check, for each sub band, presence of wind noise;
and
a signal attenuator which attenuates, of the input sound signal, only a sound signal in a sub-band where wind noise is judged to be present by the wind noise checker,
wherein
for each sub-band, the correlation value is so calculated as to be smaller the lower the cross-correlation between the plurality of channel signals, and
the wind noise checker has a threshold value set for each sub-band, compares, for each sub-band, the correlation value with the threshold value, and when the correlation value is smaller than the threshold value in a sub-band of interest, judges that wind noise is present in the sub-band of interest.

5 more elements

Dependencies are inferred from the claim text.

Wind noise reduction device

Life of this patent

Wind noise reduction device

Life of this patent

Abstract

Claims19