Patent ID: 8280062

Claim:
A sound corrector comprising: a signal outputter configured to output a measurement signal to measure acoustical properties of an object to be measured; a response signal receiver configured to receive a response signal from the object in response to the measurement signal; a frequency specifier configured to specify a resonant frequency at a resonance peak from a frequency characteristic of the response signal; a coefficient specifier configured to create an acoustic model at a position of the object which is equivalent to a position of the response signal receiver based on the resonant frequency, and specify a correction coefficient of a correction filter for reducing a resonant frequency component specified from the acoustic model; a filter configured to perform filtering on an input signal that is input to the filter, using the correction filter with the correction coefficient; and an outputter configured to output the filtered input signal to the object, wherein the frequency specifier is configured to further specify a sound pressure level at the resonance peak, and the coefficient specifier is configured to specify a propagation time to the object as the correction coefficient, the filter including a delay module in which the propagation time is set, to process the input signal, and an attenuator configured to represent reflectivity based on the sound pressure level, to process the input signal, and the filter being configured such that the input signal processed by the delay module and the attenuator is added to the input signal that has not been processed by the delay module and the attenuator, and to output the sum of the input signal processed by the delay module and the attenuator and the input signal that has not been processed by the delay module and the attenuator to the outputter as the filtered input signal.