Patent ID: 8767977

Claim:
An acoustic characteristic correction coefficient calculation apparatus comprising: a frequency converter configured to convert a first impulse response associated with an input acoustic signal to a frequency domain to obtain a frequency response, wherein the input acoustic signal is associated with a to-be-measured acoustic output unit, a smoother configured to smooth an amplitude and a phase of the frequency response to obtain a smoothed frequency characteristic associated with the frequency response, a frequency inverter configured to invert the smoothed frequency characteristic to a time domain to obtain a second impulse response, a cutter configured to cut out the second impulse response by a preset tap number to obtain a cut out impulse response, and a calculator configured to calculate a correction coefficient to correct an acoustic characteristic associated with the to-be-measured acoustic output unit, wherein the correction coefficient is based on the cutout impulse response, wherein the smoother is configured to make the amplitudes and the phases equal in a preset frequency band having an object frequency set at a center of several frequencies sampled, and wherein the frequency inverter is further configured to derive complex conjugates up to a Nyquist frequency of the smoothed frequency characteristic to determine an aliasing component.