Title :
A variable rate sampling delta modulator
Author :
Nasr, Mohamed E M
Author_Institution :
Dept. of Electr. Commun. Eng., Menoufia Univ., Egypt
Abstract :
A technique for encoding speech signals using a variable-rate sampling with incremental adaptation is presented. The proposed system has been simulated and compared on the basis of signal/noise ratio (SNR). Five types of input signals have been used including Gaussian-type signals, harmonic-type signals, and digitized speech. With four different sampling rates (8, 12, 16, and 24 kHz), one can improve the SNR by 4-5 dB or reduce the transmission rate significantly. The effect of channel errors is also discussed and the system is found to tolerate error rates of the order of 0.001 to 0.01
Keywords :
delta modulation; encoding; speech analysis and processing; Gaussian-type signals; SNR; channel errors; digitized speech; encoding speech signals; error rates; harmonic-type signals; incremental adaptation; sampling rates; signal/noise ratio; transmission rate reduction; variable rate sampling delta modulator; Buffer storage; Decoding; Delta modulation; Filtering; Frequency; Logic; Low pass filters; Sampling methods; Speech; Strontium;
Conference_Titel :
Circuits and Systems, 1988., IEEE International Symposium on
Conference_Location :
Espoo
DOI :
10.1109/ISCAS.1988.15115
