Spectral Extrapolation of Narrowband Speech

Author

Bulu, Gürhan ; Bingöl, A. Semih

Author_Institution

Elektrik ve Elektronik Miihendisligi Bolumii, Hacettepe Univ., Ankara, Turkey

fYear

2007

fDate

11-13 June 2007

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/SIU.2007.4298739

Filename

4298739