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Conference Paper: A 2000 BPS LPC vocoder based on multiband excitation

TitleA 2000 BPS LPC vocoder based on multiband excitation
Authors
KeywordsElectronics
Issue Date1997
PublisherIEEE.
Citation
IEEE International Symposium on Circuits and Systems Proceedings, Hong Kong, China, 9-12 June 1997, v. 4, p. 2653-2656 How to Cite?
AbstractThis paper presents an improved mixed LPC vocoder at 2000 bps using Multi-Band Excitation analysis by a synthesis algorithm. The new vocoder determines the voiced/unvoiced characteristics harmonic by harmonic in a frame, and finds the first voiced/unvoiced transition as the cut-off frequency, which is more accurate and efficient than traditional cut-off frequency detection. The synthetic speech below the cut-off frequency is excited by a series of voiced harmonics, while the signal above the cut-off frequency is simulated by a noise source. The final output speech is the sum of these two outputs. To increase the naturalness and clearness of the synthesized speech, this model applies phase prediction and spectral enhancement in the synthesizer. It is also possible to reduce the bit rate to 1200 bps. Informal listening tests indicate that the output speech possesses higher intelligibility and quality than that of the 2.4 kbps LPC-10e standard, and is comparable with the 4.8 kbps FS1016 CELP vocoder.
Persistent Identifierhttp://hdl.handle.net/10722/46031
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorMao, JSen_HK
dc.contributor.authorChen, Zen_HK
dc.contributor.authorChan, SCen_HK
dc.contributor.authorNg, TSen_HK
dc.contributor.authorHo, KLen_HK
dc.date.accessioned2007-10-30T06:41:03Z-
dc.date.available2007-10-30T06:41:03Z-
dc.date.issued1997en_HK
dc.identifier.citationIEEE International Symposium on Circuits and Systems Proceedings, Hong Kong, China, 9-12 June 1997, v. 4, p. 2653-2656en_HK
dc.identifier.issn0271-4302en_HK
dc.identifier.urihttp://hdl.handle.net/10722/46031-
dc.description.abstractThis paper presents an improved mixed LPC vocoder at 2000 bps using Multi-Band Excitation analysis by a synthesis algorithm. The new vocoder determines the voiced/unvoiced characteristics harmonic by harmonic in a frame, and finds the first voiced/unvoiced transition as the cut-off frequency, which is more accurate and efficient than traditional cut-off frequency detection. The synthetic speech below the cut-off frequency is excited by a series of voiced harmonics, while the signal above the cut-off frequency is simulated by a noise source. The final output speech is the sum of these two outputs. To increase the naturalness and clearness of the synthesized speech, this model applies phase prediction and spectral enhancement in the synthesizer. It is also possible to reduce the bit rate to 1200 bps. Informal listening tests indicate that the output speech possesses higher intelligibility and quality than that of the 2.4 kbps LPC-10e standard, and is comparable with the 4.8 kbps FS1016 CELP vocoder.en_HK
dc.languageengen_HK
dc.publisherIEEE.en_HK
dc.relation.ispartofIEEE International Symposium on Circuits and Systems Proceedings-
dc.rights©1997 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectElectronicsen_HK
dc.titleA 2000 BPS LPC vocoder based on multiband excitationen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0271-4302&volume=4&spage=2653&epage=2656&date=1997&atitle=A+2000+bps+LPC+vocoder+based+on+multiband+excitationen_HK
dc.identifier.emailChan, SC:scchan@eee.hku.hk-
dc.identifier.emailNg, TS:tsng@eee.hku.hk-
dc.identifier.emailHo, KL:klho@eee.hku.hk-
dc.identifier.authorityChan, SC=rp00094-
dc.identifier.authorityNg, TS=rp00159-
dc.identifier.authorityHo, KL=rp00117-
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1109/ISCAS.1997.612870en_HK
dc.identifier.scopuseid_2-s2.0-0030711381-
dc.identifier.hkuros33207-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030711381&selection=ref&src=s&origin=recordpage-
dc.identifier.volume4-
dc.identifier.spage2653-
dc.identifier.epage2656-
dc.identifier.scopusauthoridMao, JS=7402727784-
dc.identifier.scopusauthoridChen, Z=7409485154-
dc.identifier.scopusauthoridChan, SC=13310287100-
dc.identifier.scopusauthoridNg, TS=7402229975-
dc.identifier.scopusauthoridHo, KL=7403581592-
dc.customcontrol.immutablesml 151023 - merged-

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