Patent ID: 8040401

Claim:
A replay apparatus for processing a signal compressed after transformation to a signal in a frequency space, comprising: a decompressing unit for decompressing the signal to the signal in the frequency space; a noise estimating unit for estimating an amount of noise of a frequency component except for a zero-order component based on the zero-order component in the signal in the frequency space decompressed by the decompressing unit; a noise reducing unit for reducing noise of the frequency component except for the zero-order component based on the amount of noise estimated by the noise estimating unit; and an inverting transforming unit for transforming the zero-order component and the frequency component except for the zero-order component from which the noise is reduced into a signal in a real space, wherein the noise estimating unit comprises: an obtaining unit for obtaining a gain G of the signal; and a giving unit for providing standard values of the gain G of the signal; and the noise estimating unit estimates the amount of noise of the frequency component except for the zero-order component based on the gain G provided by the obtaining unit or the giving unit.