Adaptive post-filtering controlled by pitch frequency for CELP-based speech coder

Hironobu Chiba, Yutaka Kamamoto, Takehiro Moriya, Noboru Harada, Shigeki Miyabe, Takeshi Yamada, Shoji Makino

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

Abstract

Most speech codecs utilize a post-filter that emphasizes pitch structures to enhance perceptual quality at the decoder. Particularly, the bass post-filter used in ITU-T G.718 performs an adaptive pitch enhancement technique for a lower fixed frequency band. This paper describes a new post-filtering method in which the bass the frequency band and the gain are adaptively controlled frame-by-frame depending on the pitch frequency of decoded signal to improve bass post-filter performance. We have confirmed the improvement of the speech quality with the developed method through objective and subjective evaluations.

Original languageEnglish
Title of host publicationConference Record of the 48th Asilomar Conference on Signals, Systems and Computers
EditorsMichael B. Matthews
PublisherIEEE Computer Society
Pages838-842
Number of pages5
ISBN (Electronic)9781479982974
DOIs
Publication statusPublished - 2015 Apr 24
Externally publishedYes
Event48th Asilomar Conference on Signals, Systems and Computers, ACSSC 2015 - Pacific Grove, United States
Duration: 2014 Nov 22014 Nov 5

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
Volume2015-April
ISSN (Print)1058-6393

Conference

Conference48th Asilomar Conference on Signals, Systems and Computers, ACSSC 2015
CountryUnited States
CityPacific Grove
Period14/11/214/11/5

ASJC Scopus subject areas

  • Signal Processing
  • Computer Networks and Communications

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