Apparatus and method for enhancing intelligibility of speech in mobile terminal

The present invention relates to an apparatus and method for a speech signal to emphasize that, in particular in a mobile terminal to an apparatus and method for enhanced clarity, the output speech from the mobile terminal to output an enhanced speech intelligibility. The increase the speech intelligibility in a mobile terminal according to the invention apparatus, the voice of the Fourier transform of one frame of the input audio signal calculates the instant level of one frame of the composite spectrum calculator, the input voice signal for calculating a composite spectrum speech judgment group, it is determined that when the voice frame, the voice mean level calculator for calculating a voice average level of the speech frame using the instant level to determine whether the level calculator, a frame is a voice frame of the input speech signal and, with the scaling factor calculator, the scaling factors to the high-pass high-pass filter (HPF) characteristic for calculating an amplitude characteristic for the filter converter using to calculate the scaling factor by the voice average level as compared to the instant level, the based on the amplitude characteristics for the composite spectrum And a high pass filter for performing high pass filtering, the high-pass and a filtered signal inverse Fourier transformation and then generates a time-domain signal, and a synthesizer for synthesizing the time-domain signal, wherein the composite time-domain signal and the input a combination of a frame of the speech signal and a combiner for outputting an intelligibility enhanced speech signal. As described above, the present invention calculates a scaling factor of the voice frame to select only the audio frame, and calculates the high-pass filter characteristic in accordance with the level of the speech frame, the high-band by performing pass filtering the intelligibility is enhanced speech signal It can be output. Of speech intelligibility, HPF, the scaling factor, the speech frame, the envelope.