CA2224688A1 - Speech coder - Google Patents

Speech coder

Info

Publication number
CA2224688A1
CA2224688A1 CA002224688A CA2224688A CA2224688A1 CA 2224688 A1 CA2224688 A1 CA 2224688A1 CA 002224688 A CA002224688 A CA 002224688A CA 2224688 A CA2224688 A CA 2224688A CA 2224688 A1 CA2224688 A1 CA 2224688A1
Authority
CA
Canada
Prior art keywords
code book
signal
post
processor
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002224688A
Other languages
French (fr)
Other versions
CA2224688C (en
Inventor
Kari Jarvinen
Tero Honkanen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Oyj
Nokia Mobile Phones UK Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9512284.2A external-priority patent/GB9512284D0/en
Application filed by Individual filed Critical Individual
Publication of CA2224688A1 publication Critical patent/CA2224688A1/en
Application granted granted Critical
Publication of CA2224688C publication Critical patent/CA2224688C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A post-processor (317) and method substantially for enhancing synthesized speech is disclosed. The post-processor (317) operates on a signal ex(n) derived from an excitation generator (211) typically comprising a fixed code book (203) and an adaptive code book (204), the signal ex(n) being formed from the addition of scaled outputs from the fixed code book (203) and adaptive code book (204). The post-processor operates on ex(n) by adding to it a scaled signal pv(n) derived from the adaptive code book (204). A gain or scale factor p is determined by the speech coefficients input to the excitation generator (211). The combined signal ex(n) + pv(n) is normalised by unit (316) and input to an LPC or speech synthesis filter (208), prior to being input to an audio processing unit (209).
CA002224688A 1995-06-16 1996-06-13 Speech coder Expired - Lifetime CA2224688C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9512284.2 1995-06-16
GBGB9512284.2A GB9512284D0 (en) 1995-06-16 1995-06-16 Speech Synthesiser
PCT/GB1996/001428 WO1997000516A1 (en) 1995-06-16 1996-06-13 Speech coder

Publications (2)

Publication Number Publication Date
CA2224688A1 true CA2224688A1 (en) 1997-01-03
CA2224688C CA2224688C (en) 2006-03-21

Family

ID=36101538

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002224688A Expired - Lifetime CA2224688C (en) 1995-06-16 1996-06-13 Speech coder

Country Status (1)

Country Link
CA (1) CA2224688C (en)

Also Published As

Publication number Publication date
CA2224688C (en) 2006-03-21

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Effective date: 20160613