Patent ID: 8019603

Claim:
An apparatus for enhancing speech intelligibility in a mobile terminal, comprising: a complex spectrum calculator for calculating complex spectra of one input frame of an input speech signal by Fourier transform; a speech level calculator for calculating instant levels of the input frame; an average speech level calculator for, when the input frame is a speech frame, calculating an average speech level of the speech frame using the instant levels; a scaling factor calculator for calculating scaling factors by comparing the average speech level with the instant levels; a High Pass Filter (HPF) characteristic calculator for calculating amplitude characteristics for high-pass-filtering using the scaling factors; a HPF for performing high-pass-filtering on the complex spectra based on the amplitude characteristics; a synthesizer for converting high-pass-filtered signals to time signals by inverse Fourier transform and synthesizing the time signals; and a combiner for outputting an enhanced intelligibility speech signal by combining the synthesized time signals with the input frame.