Provided is
speech processing technology capable of making speech clearer than before. The present invention comprises: a speech
signal generation unit (11) that generates a first speech
signal (x1) and a second speech
signal (x2) having mutually equal spectra from a speech signal representing speech; a filter (13) that at least removes, from the first speech signal, a first frequency component that is less than or equal to a prescribed first frequency; a synthesis unit (14) that generates a synthesized speech signal by adding and synthesizing the first speech signal from which the first frequency component has been removed and the second speech signal; and a correction signal generation unit (12) that generates a
phase correction signal (p) on the basis of the second speech signal. The filter has an
operational amplifier (132a) that amplifies the first speech signal. The
operational amplifier is configured such that the first speech signal is input to an inverting input terminal, and in response to input of a
phase correction signal to a non-inverting input terminal, the first speech signal that has been corrected so that the phase approaches the phase of the second speech signal is output.