Performance and Error Sensitivity Comparison of Low and High Delay CELP Codecs Between 8 and 4 kbits/s
Performance and Error Sensitivity Comparison of Low and High Delay CELP Codecs Between 8 and 4 kbits/s
In this paper we study the performance and error sensitivities of several CELP based codecs operating between 8 and 4 kbits/s. Both forward and backward adaption techniques are used for the short and long term predictors, and both trained and Algebraic excitation codebooks are used. Three codecs which employ backward adaption of their short term predictors and operate with frame-lengths of 3ms or less are described. These codecs operate between 8 and 4 kbits/s and their performance at these bit rates is compared to a traditional forward adaptive Algebraic CELP codec operating at 4.7, 6.5 and 7.1kbits/s. Furthermore, the error sensitivity of the backward adaptive codecs, and means of improving this error sensitivity, are investigated. Finally, we compare the error sensitivity of the low delay, backward adaptive codecs to the high delay, forward adaptive codec. Surprisingly, we found that it is possible to achieve good error resilience, comparable to that of the forward adaptive codec, using low delay backward adaptive codecs.
1000-1004
Woodard, J P
f1296f1b-304c-4165-a4d4-828e85a59857
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
October 1996
Woodard, J P
f1296f1b-304c-4165-a4d4-828e85a59857
Hanzo, L
66e7266f-3066-4fc0-8391-e000acce71a1
Woodard, J P and Hanzo, L
(1996)
Performance and Error Sensitivity Comparison of Low and High Delay CELP Codecs Between 8 and 4 kbits/s.
of PIMRC'96, Taipei, Taiwan.
15 - 18 Oct 1996.
.
Record type:
Conference or Workshop Item
(Other)
Abstract
In this paper we study the performance and error sensitivities of several CELP based codecs operating between 8 and 4 kbits/s. Both forward and backward adaption techniques are used for the short and long term predictors, and both trained and Algebraic excitation codebooks are used. Three codecs which employ backward adaption of their short term predictors and operate with frame-lengths of 3ms or less are described. These codecs operate between 8 and 4 kbits/s and their performance at these bit rates is compared to a traditional forward adaptive Algebraic CELP codec operating at 4.7, 6.5 and 7.1kbits/s. Furthermore, the error sensitivity of the backward adaptive codecs, and means of improving this error sensitivity, are investigated. Finally, we compare the error sensitivity of the low delay, backward adaptive codecs to the high delay, forward adaptive codec. Surprisingly, we found that it is possible to achieve good error resilience, comparable to that of the forward adaptive codec, using low delay backward adaptive codecs.
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jpw-lh-pimrc-1996.pdf
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Published date: October 1996
Additional Information:
Event Dates: 15-18 October 1996 Organisation: PIMRC'96 Address: Taipei, Taiwan
Venue - Dates:
of PIMRC'96, Taipei, Taiwan, 1996-10-15 - 1996-10-18
Organisations:
Southampton Wireless Group
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Local EPrints ID: 257103
URI: http://eprints.soton.ac.uk/id/eprint/257103
PURE UUID: f58e9a35-25a6-4888-a113-0a27c33dfd18
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Date deposited: 12 Dec 2002
Last modified: 18 Mar 2024 02:33
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Contributors
Author:
J P Woodard
Author:
L Hanzo
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