Improvements of background sound coding in linear predictive speech coders

A proper coding of background sounds has proven to be important in digital cellular telephone systems. It is therefore of considerable interest to find methods that improve also background sound coding, in particular in medium and low bitrate speech coders. In many coders operating around 8 kbps, on...

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Published in1995 International Conference on Acoustics, Speech, and Signal Processing Vol. 1; pp. 25 - 28 vol.1
Main Authors Wigren, T., Bergstrom, A., Harrysson, S., Jansson, F., Nilson, H.
Format Conference Proceeding
LanguageEnglish
Published IEEE 1995
Subjects
Acoustic noise
Background noise
Band pass filters
Bit error rate
Bit rate
Speech codecs
Speech coding
Speech enhancement
System testing
Telephony
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Summary:A proper coding of background sounds has proven to be important in digital cellular telephone systems. It is therefore of considerable interest to find methods that improve also background sound coding, in particular in medium and low bitrate speech coders. In many coders operating around 8 kbps, one significant effect has been a swirling distortion when coding for example smooth car noise. The paper discusses the origin of this problem, and presents an algorithm that reduces swirling, giving a significant overall perceptual improvement, as shown by field tests in commercial D-AMPS systems in the US. A related new algorithm for error concealment is also presented. This method makes it possible to perceptually remove the effect of fading dips persisting for a few seconds, during nonspeech periods.
ISBN:9780780324312
0780324315
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.1995.479513