Matches in SemOpenAlex for { <https://semopenalex.org/work/W99607951> ?p ?o ?g. }
Showing items 1 to 84 of
84
with 100 items per page.
- W99607951 abstract "The bandwidth of telephone speech is limited to a 300 – 3400 Hz bandwidth. The sound quality is much lower than for broadcast radio and audio compact discs. We present an algorithm to regenerate the missing highband components (3.4–7 kHz). The highband spectrum recovery is based on a Line Spectrum Frequency (LSF) VQ codebook mapping from the narrowband speech to the high frequency components. The highband excitation employs a substitute of a bandpass (2–3 kHz) envelope modulated Gaussian White Noise. The modulation gain of the excitation exploits a lowband LSF VQ mapping codebook. Spectrograms demonstrate that the reproduced speech has obtained most of missing components. Subjective tests show that the reconstructed speech is significantly more pleasant and natural than the conventional telephone speech. Summary The present public telephone networks limit human voice transmission to a narrow bandwidth (300–3400 Hz) for compatibility with the existing infrastructure. Although speech with this bandwidth is highly intelligible, it has lost most of the high frequency components over 3.4 kHz which give the speech a “presence”. The sound quality is not comparable to common broadcast radio, TV and compact discs. The wider bandwidth better preserves speaker identity. 3G wireless systems can deliver wideband speech (up to 7 kHz). However, the extra quality will be lost in the connection to the existing narrowband PSTN. Pseudo-wideband expansion techniques can recreate the missing highband components of narrowband speech from the PSTN to the wideband terminal. This provides a pragmatic approach to enhance the quality presented to the owner of a wideband phone. The challenging task is to recover the signal in the 3.4–7 kHz range from the narrowband signal. We employ a speech synthesis model which uses an excitation signal and a spectral envelope. The excitation signal can be modelled as white noise for unvoiced phonemes, a pulse train for voiced phonemes and their mix for transitions. The missing high frequency components of the excitation can be generated in a number of ways from the narrowband residual of an LP (Linear Prediction) filter. The highband excitation can be formed in a manner similar to LPC coding by modelling the excitation as a pulse train" @default.
- W99607951 created "2016-06-24" @default.
- W99607951 creator A5020218774 @default.
- W99607951 creator A5028284188 @default.
- W99607951 date "2002-01-01" @default.
- W99607951 modified "2023-09-26" @default.
- W99607951 title "PSEUDO-WIDEBAND SPEECH RECONSTRUCTION FROM TELEPHONE SPEECH" @default.
- W99607951 cites W1943463263 @default.
- W99607951 cites W88864901 @default.
- W99607951 cites W97829328 @default.
- W99607951 hasPublicationYear "2002" @default.
- W99607951 type Work @default.
- W99607951 sameAs 99607951 @default.
- W99607951 citedByCount "0" @default.
- W99607951 crossrefType "journal-article" @default.
- W99607951 hasAuthorship W99607951A5020218774 @default.
- W99607951 hasAuthorship W99607951A5028284188 @default.
- W99607951 hasConcept C100675267 @default.
- W99607951 hasConcept C121332964 @default.
- W99607951 hasConcept C127413603 @default.
- W99607951 hasConcept C13895895 @default.
- W99607951 hasConcept C173391809 @default.
- W99607951 hasConcept C204201278 @default.
- W99607951 hasConcept C24326235 @default.
- W99607951 hasConcept C24890656 @default.
- W99607951 hasConcept C2776096036 @default.
- W99607951 hasConcept C2776182073 @default.
- W99607951 hasConcept C2776257435 @default.
- W99607951 hasConcept C2780202535 @default.
- W99607951 hasConcept C28490314 @default.
- W99607951 hasConcept C41008148 @default.
- W99607951 hasConcept C45273575 @default.
- W99607951 hasConcept C61328038 @default.
- W99607951 hasConcept C64922751 @default.
- W99607951 hasConcept C76155785 @default.
- W99607951 hasConcept C87687168 @default.
- W99607951 hasConcept C9387945 @default.
- W99607951 hasConceptScore W99607951C100675267 @default.
- W99607951 hasConceptScore W99607951C121332964 @default.
- W99607951 hasConceptScore W99607951C127413603 @default.
- W99607951 hasConceptScore W99607951C13895895 @default.
- W99607951 hasConceptScore W99607951C173391809 @default.
- W99607951 hasConceptScore W99607951C204201278 @default.
- W99607951 hasConceptScore W99607951C24326235 @default.
- W99607951 hasConceptScore W99607951C24890656 @default.
- W99607951 hasConceptScore W99607951C2776096036 @default.
- W99607951 hasConceptScore W99607951C2776182073 @default.
- W99607951 hasConceptScore W99607951C2776257435 @default.
- W99607951 hasConceptScore W99607951C2780202535 @default.
- W99607951 hasConceptScore W99607951C28490314 @default.
- W99607951 hasConceptScore W99607951C41008148 @default.
- W99607951 hasConceptScore W99607951C45273575 @default.
- W99607951 hasConceptScore W99607951C61328038 @default.
- W99607951 hasConceptScore W99607951C64922751 @default.
- W99607951 hasConceptScore W99607951C76155785 @default.
- W99607951 hasConceptScore W99607951C87687168 @default.
- W99607951 hasConceptScore W99607951C9387945 @default.
- W99607951 hasLocation W996079511 @default.
- W99607951 hasOpenAccess W99607951 @default.
- W99607951 hasPrimaryLocation W996079511 @default.
- W99607951 hasRelatedWork W1913397100 @default.
- W99607951 hasRelatedWork W1932653299 @default.
- W99607951 hasRelatedWork W1963360513 @default.
- W99607951 hasRelatedWork W2102448902 @default.
- W99607951 hasRelatedWork W2103133081 @default.
- W99607951 hasRelatedWork W2112665203 @default.
- W99607951 hasRelatedWork W2127711272 @default.
- W99607951 hasRelatedWork W2140188101 @default.
- W99607951 hasRelatedWork W2171815504 @default.
- W99607951 hasRelatedWork W2592346140 @default.
- W99607951 hasRelatedWork W2611747207 @default.
- W99607951 hasRelatedWork W2942518045 @default.
- W99607951 hasRelatedWork W2946152485 @default.
- W99607951 hasRelatedWork W3142616080 @default.
- W99607951 hasRelatedWork W3152940417 @default.
- W99607951 hasRelatedWork W106981560 @default.
- W99607951 hasRelatedWork W1518440693 @default.
- W99607951 hasRelatedWork W1655119680 @default.
- W99607951 hasRelatedWork W2655258431 @default.
- W99607951 hasRelatedWork W2930147674 @default.
- W99607951 isParatext "false" @default.
- W99607951 isRetracted "false" @default.
- W99607951 magId "99607951" @default.
- W99607951 workType "article" @default.