15. A speech correction apparatus according to claim 14 , wherein the identifying unit is a coefficient update unit for updating a filter coefficient of the filter so that the power of the signal supplied from the operating unit is minimized, and the apparatus further comprises a filter initial setting unit for setting an initial value of the filter coefficient, which is updated by the coefficient update unit, at a value other than 0.
14. A speech correction apparatus according to claim 13 , further comprising an identifying unit for identifying the acoustic characteristic of the filter.