Title :
A multi-digit incremental coding of speech for low bit rate transmission
Author :
Nasr, Mohamed E M ; Khamees, Salah K.
Author_Institution :
Fac. of Electron. Eng., Menoufia Univ., Egypt
Abstract :
An improved waveform coding technique able to produce a good quality of speech in the vicinity of 16 Kb/s is presented. The proposed scheme generates an output code word, which consist of a binary and a ternary digit. This is achieved by modifying the basic step size compared to the other systems, and hence, provide a more accurate reproduction of the waveform. Besides, it is able to respond to very fast changes in the input due to the wide range of step changes. Simulation results indicate that, the proposed algorithm yields about an 8-dB signal to noise ratio and a 5-10 dB dynamic range improvement compared to other schemes. Further, the effects of channel errors have been studied and its channel error tolerance is satisfactory (0.15%)
Keywords :
adaptive modulation; delta modulation; speech coding; speech intelligibility; algorithm; binary digit; channel error tolerance; dynamic range improvement; error rates; incremental adaptive delta modulation; low bit rate transmission; multi-digit incremental coding; output code word; signal to noise ratio; simulation results; speech coding; speech quality; step size; ternary digit; waveform coding; waveform reproduction; Bandwidth; Bit rate; Delta modulation; Dynamic range; ISDN; Land mobile radio cellular systems; Oral communication; Pulse modulation; Signal to noise ratio; Speech coding;
Conference_Titel :
Radio Science Conference, 1999. NRSC '99. Proceedings of the Sixteenth National
Conference_Location :
Cairo
Print_ISBN :
977-5031-62-1
DOI :
10.1109/NRSC.1999.760915
