Patent ID: 8494845

Claim:
A signal distortion elimination apparatus that eliminates signal distortion of an observed signal provided by a sensor to obtain a restored signal, said signal distortion elimination apparatus comprising: an inverse filter application unit that receives an input of said observed signal provided by said sensor and an input of a filter to be applied to said observed signal provided by said sensor, hereinafter referred to as an inverse filter, applies said inverse filter to said observed signal provided by said sensor, and outputs the results thereof as said restored signal when a predetermined iteration termination condition is met and as an ad-hoc signal when said iteration termination condition is not met; a prediction error filter calculation unit that receives an input of said ad-hoc signal without receiving an input of said observed signal provided by said sensor, segments said ad-hoc signal into frames, and outputs a prediction error filter of each of said frames obtained by performing linear prediction analysis on said ad-hoc signal of each frame; an inverse filter calculation unit that receives an input of said observed signal provided by said sensor and an input of said prediction error filter of each of said frames and updates said inverse filter to be applied to said observed signal fed into said inverse filter application unit such that the samples of a concatenation of innovation estimates of said respective frames, hereinafter referred to as an innovation estimate sequence, become mutually independent, where said innovation estimate of a single frame is the signal obtained by applying said prediction error filter of the corresponding frame to the ad-hoc signal of the corresponding frame that is calculated by applying said inverse filter to said observed signal provided by said sensor; and a control unit that iteratively executes said inverse filter application unit, said prediction error filter calculation unit and said inverse filter calculation unit until the iteration termination condition is met.