Patent ID: 8509451

Claim:
A noise suppressing device being operable with a plurality of sound receiving units for outputting a plurality of sound signals based on received sound, and that suppresses noise in the sound received by the sound receiving units, comprising: a suppressing unit for suppressing noise by subtracting a noise component derived on the basis of the plurality of sound signals output by the sound receiving units from the sound signals; a variation deriving unit for deriving a degree of variation by numerically quantizing the variation on the basis of an amplitude spectrum obtained by converting the plurality of sound signals to components on a frequency axis; a determining unit for determining that wind noise is occurring due to wind blowing against the sound receiving units when the degree of variation is equal to or greater than a specified variation threshold value; and an adjusting unit for adjusting an amount of suppression according to the decision of the determining unit about whether or not wind noise is occurring; wherein the suppressing unit suppresses noise by subtracting the noise component from the sound signals based on the amount of suppression adjusted by the adjusting unit, wherein the determining is performed in accordance with 1 ω 3 - ω 2 ⁢ ∑ ω 2 ω 3 ⁢ ϕ ⁡ ( ω ) 2 > β where ω is frequency, φ is phase difference and β is the variation threshold value, and where ω 2 is a third frequency and ω 3 is a fourth frequency higher than ω 2 .