Signal correction apparatus equipped with correction function estimation unit

摘要

A signal correction apparatus receives an input audio signal (serving as a first sound reception means). The signal correction apparatus computes, at every frequency, first power that indicates magnitude of sound represented by the input audio signal (serving as a first power computation means). The signal correction apparatus estimates a correction function that is a continuous function defining a relation between each frequency and a correction coefficient used to approximate the first power computed at that frequency to the reference power predetermined for that frequency (serving as a correction function estimation means). The signal correction apparatus multiplies the computed first power by the correction coefficient acquired in accordance with the relation defined by the estimated correction function so as to correct the first power at every frequency (serving as a power correcting means).

主权项

1. A signal correction apparatus comprising:
a first sound reception unit for receiving an input audio signal; a first power computation unit for computing, at every frequency, first power that indicates magnitude of sound represented by an audio signal, based upon the audio signal received by the first sound reception unit; a correction function estimation unit for estimating a correction function that is a continuous function defining a relation between each frequency and a correction coefficient used to approximate the computed first power at that frequency to a reference power predetermined for that frequency; and a power correcting unit multiplying the computed first power by the correction coefficient obtained in accordance with the relation defined by the estimated correction function, for correcting the first power at every frequency; wherein the correction function is a polynomial function with regard to a variable of the frequency, of which order is changeable.