CA2050979A1 - Method for coding an analog signal having a repetitive nature and a device for coding by said method - Google Patents

Method for coding an analog signal having a repetitive nature and a device for coding by said method

Info

Publication number
CA2050979A1
CA2050979A1 CA2050979A CA2050979A CA2050979A1 CA 2050979 A1 CA2050979 A1 CA 2050979A1 CA 2050979 A CA2050979 A CA 2050979A CA 2050979 A CA2050979 A CA 2050979A CA 2050979 A1 CA2050979 A1 CA 2050979A1
Authority
CA
Canada
Prior art keywords
segment
samples
coded
coding
ltp
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
CA2050979A
Other languages
French (fr)
Other versions
CA2050979C (en
Inventor
Adrianus Alphonsius Maria Van Der Krogt
Robertus Lambertus Adrianus Van Ravesteijn
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.)
Koninklijke KPN NV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19857655&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2050979(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2050979A1 publication Critical patent/CA2050979A1/en
Application granted granted Critical
Publication of CA2050979C publication Critical patent/CA2050979C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/09—Long term prediction, i.e. removing periodical redundancies, e.g. by using adaptive codebook or pitch predictor

Abstract

Method and device for coding a signal segment of a sampled analog signal having a repetitive nature according to the principle of long-term prediction (LTP), in which an accuracy is achieved in the coding which is comparable to that of high-resolution LTP
(HLTP) without the complexity appreciably increasing with respect to that of LTP. According to the method, after determining the number of samples D between the beginning of the segment to be coded and the beginning of the most similar segment determined according to the LTP principle, the number of samples in the segment to be coded is increased by a predetermined factor Ob by always placing (Ob - 1) samples having a value equal to 0 between two consecutive samples, and the number of samples in the preceding segment is also increased by the factor Ob; in the preceding segment, partial segments Cd are determined for which it is the case that the number of samples Dd, expressed in the numbers of samples after oversampling, between the initial time instant of the segment to be coded and the initial time instant of a partial segment Cd fulfils:
Dd = (D * Ob)/d, in which d = 1, 2, 3, 4 ...n, where n is a positive integer and where Ob and n are chosen in a manner such that Dd is always an integer, after which, in the segments Cd, the sample values are determined, by means of an interpolation technique, at predetermined positions which are situated at a spacing Dd from the original samples in the segment to be coded; of the segments Cd, that segment Cd is chosen as the most similar segment which has a correlation value Rd with the samples of the segment to be coded for which it is the case that Rd q * Rmax, where q < 1 and Rmax is the maximum correlation value which has been found in correlating the segments Cd and the segment to be coded, and is that segment which yields the smallest associated value of Dd.
CA002050979A 1990-09-10 1991-09-09 Method for coding an analog signal having a repetitive nature and a device for coding by said method Expired - Lifetime CA2050979C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL9001985A NL9001985A (en) 1990-09-10 1990-09-10 METHOD FOR CODING AN ANALOGUE SIGNAL WITH A REPEATING CHARACTER AND A DEVICE FOR CODING ACCORDING TO THIS METHOD
NL9001985 1990-09-10

Publications (2)

Publication Number Publication Date
CA2050979A1 true CA2050979A1 (en) 1992-03-11
CA2050979C CA2050979C (en) 1996-05-21

Family

ID=19857655

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002050979A Expired - Lifetime CA2050979C (en) 1990-09-10 1991-09-09 Method for coding an analog signal having a repetitive nature and a device for coding by said method

Country Status (11)

Country Link
EP (1) EP0475520B1 (en)
JP (1) JP2640595B2 (en)
AT (1) ATE137354T1 (en)
CA (1) CA2050979C (en)
DE (1) DE69119005T2 (en)
DK (1) DK0475520T3 (en)
ES (1) ES2089113T3 (en)
FI (1) FI105624B (en)
NL (1) NL9001985A (en)
NO (1) NO302549B1 (en)
PT (1) PT98900B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI116992B (en) 1999-07-05 2006-04-28 Nokia Corp Methods, systems, and devices for enhancing audio coding and transmission
US7388201B2 (en) 2005-05-13 2008-06-17 National University Of Singapore Radiation detector having coated nanostructure and method
CN117176177B (en) * 2023-11-03 2024-02-06 金乡县林业保护和发展服务中心(金乡县湿地保护中心、金乡县野生动植物保护中心、金乡县国有白洼林场) Data sharing method and system for forestry information

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5648688A (en) * 1979-09-28 1981-05-01 Hitachi Ltd Sound analyser
ES2037101T3 (en) * 1987-03-05 1993-06-16 International Business Machines Corporation TONE DETECTION AND VOICE ENCODER PROCEDURE USING SUCH PROCEDURE.

Also Published As

Publication number Publication date
JPH05206955A (en) 1993-08-13
PT98900A (en) 1994-01-31
PT98900B (en) 1999-02-26
DK0475520T3 (en) 1996-09-02
FI914261A (en) 1992-03-11
EP0475520B1 (en) 1996-04-24
JP2640595B2 (en) 1997-08-13
NL9001985A (en) 1992-04-01
FI105624B (en) 2000-09-15
NO302549B1 (en) 1998-03-16
EP0475520A3 (en) 1992-09-30
FI914261A0 (en) 1991-09-10
ATE137354T1 (en) 1996-05-15
NO913448L (en) 1992-03-11
EP0475520A2 (en) 1992-03-18
ES2089113T3 (en) 1996-10-01
NO913448D0 (en) 1991-09-03
DE69119005D1 (en) 1996-05-30
DE69119005T2 (en) 1996-11-28
CA2050979C (en) 1996-05-21

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