Improvement of ADP-CELP speech coding at 4 kbits/s

Masami Akamine, Kimio Miseki, Masahiro Oshikiri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The authors describe improvements in the ADP-CELP (adaptive- density-pulse code-excited-linear-prediction) coder at 4 kb/s. A fractional delay was introduced to the adaptive codebook. A fast exhaustive search procedure for a uniformly distributed fractional delay was studied for the case where the delay length is shorter than the codevector's dimension. A novel method to determine the long-term predictor's gain was also used. Four methods to find the density pattern of the ADP excitation were investigated. A modified adaptive postfilter was used to improve subjective speech quality.

Original languageEnglish
Title of host publicationIEEE Global Telecommunications Conference and Exhibition
PublisherPubl by IEEE
Pages1869-1873
Number of pages5
ISBN (Print)0879426977
Publication statusPublished - 1991 Dec 1
Externally publishedYes
EventIEEE Global Telecommunications Conference - GLOBECOM '91 Part 3 (of 3) - Phoenix, AZ, USA
Duration: 1991 Dec 21991 Dec 5

Publication series

NameIEEE Global Telecommunications Conference and Exhibition
Volume3

Other

OtherIEEE Global Telecommunications Conference - GLOBECOM '91 Part 3 (of 3)
CityPhoenix, AZ, USA
Period91/12/291/12/5

ASJC Scopus subject areas

  • Engineering(all)

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