Title :
Optimized configuration of the short time DFT compander and its noise reduction effect
Author :
Kishi, Masahichi ; Iwata, Hiroshi
Author_Institution :
Inf. Network Eng., Aichi Inst. of Technol., Japan
Abstract :
The circuitry configuration, fast processing algorithm, and noise reduction of the short-time discrete Fourier transform (ST DFT) compander are described. Multirate sampling signal processing is efficiently introduced to reduce the amount of processing in the ST DFT analyzer. The ST DFT compander, which uses the instantaneous spectrum concept, is shown to be free from distortion by avoiding detection of the voice envelopes and to be effective in reducing fading noise over poor radio channels
Keywords :
compandors; fading; fast Fourier transforms; interference suppression; mobile radio systems; circuitry configuration; distortion; fading noise; fast processing algorithm; instantaneous spectrum; noise reduction; radio channels; short time DFT compander; short-time discrete Fourier transform; vehicular communication systems; voice envelopes; Bandwidth; Baseband; Circuits; Communication systems; Envelope detectors; Fading; Feeds; Frequency domain analysis; Noise reduction; Speech;
Conference_Titel :
Vehicular Technology Conference, 1992, IEEE 42nd
Conference_Location :
Denver, CO
Print_ISBN :
0-7803-0673-2
DOI :
10.1109/VETEC.1992.245420
