Title :
Spectral Extrapolation of Narrowband Speech
Author :
Bulu, Gürhan ; Bingöl, A. Semih
Author_Institution :
Elektrik ve Elektronik Miihendisligi Bolumii, Hacettepe Univ., Ankara, Turkey
Abstract :
It is known that human speech has components up to 7-8 kHz. However in telephony, speech is usually lowpass filtered at 3.4 kHz and sampled at 8 kHz. Although this filtering operation has little effect on intelligibility, it causes a perceptible degradation in speech quality. This paper deals with the reconstruction of the lost high frequency content of telephone speech using the low frequency spectral information. A reconstruction method based on a lookup table is described and preliminary results are presented.
Keywords :
extrapolation; low-pass filters; signal reconstruction; speech processing; frequency 3.4 kHz; frequency 7 kHz to 8 kHz; frequency 8 kHz; lookup table; lost high frequency content reconstruction; low frequency spectral information; lowpass filtering; narrowband speech; spectral extrapolation; speech quality; telephone speech; telephony; Degradation; Extrapolation; Filtering; Frequency; Humans; Narrowband; Reconstruction algorithms; Speech; Table lookup; Telephony;
Conference_Titel :
Signal Processing and Communications Applications, 2007. SIU 2007. IEEE 15th
Conference_Location :
Eskisehir
Print_ISBN :
1-4244-0719-2
Electronic_ISBN :
1-4244-0720-6
DOI :
10.1109/SIU.2007.4298739
