Patent ID: 8655663

Claim:
An audio signal interpolation device, comprising: an input unit for receiving an input audio signal in which a high range component has been cut off; a phase splitting unit for splitting the input audio signal into an in-phase component signal and a differential phase component signal; a high range interpolation unit for interpolating a high range component into the in-phase component signal and the differential phase component signal from the phase splitting unit; a phase combining unit for combining the in-phase component signal and the differential phase component signal into which the high range component has been interpolated by the high range interpolation unit; a high-pass filter for high-pass filtering the audio signal combined by the phase combining unit, and outputting the audio signal formed of the high range component; a delay unit for producing a delayed audio signal by delaying the input audio signal by a time period corresponding to a phase delay generated by an interpolation processing; and an addition processing unit for adding the delayed audio signal to the audio signal output from the high-pass filter.