Patent ID: 9099093
Filing Date: 2015-08-04
Classification: G10L

Abstract:
1. An apparatus for improving intelligibility of a voice signal, the apparatus comprising: a measurement unit configured to analyze a background noise signal on a call receiving side; a voice signal conversion unit configured to classify a received voice signal into a silence signal, an unvoiced sound signal, and a voiced sound signal and intensifying the received voice signal on the basis of the classification result and the analysis result with respect to the background noise signal; and a speaker configured to output the intensified voice signal, wherein classifying the received voice signal comprises performing a Fast Fourier Transform (FFT) with respect to the received voice signal and dividing the FFT signal into bands, intensifying the received voice signal comprises calculating a first signal to noise ratio (SNR) of the unvoiced sound signal power and the background noise signal power, calculating a second SNR of the voiced sound signal power and the background noise signal power, calculating each band gain in response to the bands in case of the voiced sound signal, increasing the power of the unvoiced sound signal on the basis of the background noise signal power if the first SNR is less than a first predetermined value, and increasing the power of the voiced sound signal on the basis of each band gain if the second SNR is less than a second predetermined value, and outputting an output voice signal output based on the silence signal, the intensified voiced sound signal, and the intensified unvoiced sound signal.