Title :
Envelope Dynamic Ratio Quantizer
Author :
Xydeas, Costas S. ; Faruqui, M.N. ; Steele, Raymond
Author_Institution :
Loughborough University of Technology, Loughborough England
fDate :
5/1/1980 12:00:00 AM
Abstract :
The envelope dynamic ratio quantizer (envelope DRQ) is an adaptive quantizer for speech signals. By utilizing the envelope of the speech, nonlinear elements, a fixed quantizer and a simple predictor, a closed-loop adaptive quantizer emerges having a high constant SNR over a wide dynamic range. The theory of the quantizer is presented, together with computer simulation results which show an improvement.compared to the one word memory APCM system. Finally, the simplicity of implementing the envelope DRQ is described.
Keywords :
Adaptive coding; Speech coding; Computer simulation; Control systems; Decoding; Dynamic range; Feedback loop; Modulation coding; Pulse modulation; Quantization; Signal to noise ratio; Speech;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOM.1980.1094713
