DocumentCode
3029357
Title
Quality ratings of LPC vocoders: Effects of number of poles, quantization, and frame rate.
Author
Huggins, A. W F ; Viswanathan, Ramanarayanan ; Makhoul, J.
Author_Institution
Bolt Beranek and Newman, Cambridge
Volume
2
fYear
1977
fDate
28246
Firstpage
413
Lastpage
416
Abstract
Four values for number of poles (13, 11, 9, 8) were combined factorially with three values of step size for quantization of log area ratios (0.5, 1, 2 dB), and with four values of frame rate (100, 67, 50, 33 per second), to define 48 LPC vocoder systems with overall bit rates ranging from 8.7 down to 1.3 kbps. Subjects rated the DEGRADATION of signal quality by each vocoder, for each of seven sentence tokens, chosen to challenge LPC vocoders maximally. The results define the combination of LPC parameters yielding the best speech quality for any desired overall bit rate.
Keywords
Bit rate; Degradation; Fasteners; Huffman coding; Linear predictive coding; Materials testing; Phase change materials; Quantization; Speech; Vocoders;
fLanguage
English
Publisher
ieee
Conference_Titel
Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '77.
Type
conf
DOI
10.1109/ICASSP.1977.1170321
Filename
1170321
Link To Document