EP 1933306 A1 20080618 - Method and apparatus for transcoding a speech signal from a first code excited linear prediction (CELP) format to a second code excited linear prediction (CELP) format
Title (en)
Method and apparatus for transcoding a speech signal from a first code excited linear prediction (CELP) format to a second code excited linear prediction (CELP) format
Title (de)
Verfahren und Vorrichtung zur Transcodierung eines Sprachsignals von einem ersten CELP-Format in ein zweites CELP-Format
Title (fr)
Procédé et appareil de transcodage de signaux de parole entre deux codeurs de format CELP
Publication
Application
Priority
EP 06025955 A 20061214
Abstract (en)
The method of the present invention comprises the following steps: receiving a first coded speech signal using the first CELP format and including at least a first pitch parameter; decoding the received first coded speech signal to a decoded pcm speech signal; detecting a voiced level of the pcm speech signal within a predetermined time window; determining, if the pcm speech signal is a voiced speech signal or an unvoiced speech signal dependent on at least a first parameter; if the pcm speech signal is voiced, performing a closed loop search process which receives at least the first pitch parameter and estimates a second pitch parameter for the second CELP format dependent on at least the first pitch parameter; and if the pcm speech signal is unvoiced, copying the first pitch parameter as the second pitch parameter for the second CELP format.
IPC 8 full level
G10L 19/12 (2006.01); G10L 19/14 (2006.01); G10L 19/16 (2013.01)
CPC (source: EP)
G10L 19/12 (2013.01); G10L 19/173 (2013.01)
Citation (search report)
- [A] WO 03058407 A2 20030717 - DILITHIUM NETWORKS INC [US], et al
- [Y] DALWON JANG ET AL: "A Novel Rate Selection Algorithm for Transcoding CELP-type Codec and SMV", EUROSPEECH 2003, September 2003 (2003-09-01), Geneva, CH, pages 2865, XP007007018
- [DY] JIN-KYU CHOI ET AL: "Improvement issues on transcoding algorithms : for the flexible usage to the various pairs of speech codec", IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 2004. PROCEEDINGS. (ICASSP '04)., 17 May 2004 (2004-05-17) - 21 May 2004 (2004-05-21), MONTREAL, QUEBEC, CANADA, pages 269 - 272, XP010717617, ISBN: 0-7803-8484-9
- [DA] PANKAJ K R ED - MATTHEWS M B (ED) INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "A novel transcoding scheme from EVRC to G.729AB", CONFERENCE RECORD OF THE 37TH. ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS, & COMPUTERS. PACIFIC GROOVE, CA, NOV. 9 - 12, 2003, ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 2. CONF. 37, 9 November 2003 (2003-11-09), pages 533 - 536, XP010702678, ISBN: 0-7803-8104-1
- [DA] KYUNG TAE KIM ET AL: "An efficient transcoding algorithm for G.723.1 and EVRC speech coders", VTC FALL 2001. IEEE 54TH. VEHICULAR TECHNOLOGY CONFERENCE. PROCEEDINGS. ATLANTIC CITY, NJ, OCT. 7 - 11, 2001, IEEE VEHICULAR TECHNOLGY CONFERENCE, NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 4. CONF. 54, 7 October 2001 (2001-10-07), pages 1561 - 1564, XP010562224, ISBN: 0-7803-7005-8
- [A] GHENANIA M ET AL: "TRANSCODAGE INTELLIGENT A FAIBLE COMPLEXITE EXTRE LES CODEURS UIT-T G.729 ET 3GPP NB-AMR (12.2 KBIT/S)", CORESA. COMPRESSION ET REPRESENTATION DES SIGNAUX AUDIOVISUELS, 25 May 2004 (2004-05-25), pages 85 - 88, XP001199662
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
DOCDB simple family (application)
EP 06025955 A 20061214