Global Patent Index - EP 1990799 A1

EP 1990799 A1 20081112 - Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic

Title (en)

Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic

Title (de)

Audiokodierer, Audiodekodierer und Audioprozessor mit einer dynamisch variablen Warp-Charakteristik

Title (fr)

Codeur audio, décodeur audio et processeur audio à caractéristique de warping variable

Publication

EP 1990799 A1 20081112 (EN)

Application

EP 08014723 A 20060630

Priority

EP 06013604 A 20060630

Abstract (en)

An audio encoder, an audio decoder or an audio processor includes a filter for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal, the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.

IPC 8 full level

G10L 19/00 (2006.01); G10L 19/20 (2013.01)

CPC (source: EP)

G10L 19/20 (2013.01); G10L 19/265 (2013.01)

Citation (applicant)

  • B. EDLER; G. SCHULLER: "Audio coding using a psy- choacoustic pre- and post-filter", ICASSP 2000, vol. 2, 5 June 2000 (2000-06-05), pages II881 - II884
  • G. SCHULLER ET AL.: "Perceptual Audio Coding using Adaptive Pre- and Post-Filters and Lossless Compression", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, September 2002 (2002-09-01), pages 379 - 390
  • ZWICKER, E.; H. FASTL: "Psychoacoustics, Facts and Models", SPRINGER VERLAG
  • M. KARJALAINEN; A. HARMA; U.K. LAINE: "Realizable warped IIR filters and their properties", IEEE ICASSP, vol. 3, 1997, pages 2205 - 2208
  • J.O. SMITH; J.S. ABEL: "BARK and ERB Bilinear Transforms", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, vol. 7, 6 November 1999 (1999-11-06), pages 697 - 708
  • HARMA, AKI ET AL.: "Frequency-Warped Signal Processing for Audio Ap plications", JOURNAL OF THE AES, vol. 48, no. 11, November 2000 (2000-11-01), pages 1011 - 1031
  • E. SCHUIJERS ET AL.: "Advances in Parametric Coding for High-Quality Audio", 114TH CONVENTION, 2003
  • S. WABNIK ET AL.: "Frequency Warping in Low Delay Audio Coding", IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, 18 March 2005 (2005-03-18)
  • K. TOKUDA ET AL.: "Speech coding based on adaptive mel-cepstral analysis", PROC. IEEE ICASSP'94, April 1994 (1994-04-01), pages 197 - 200
  • K. KOISHIDA ET AL.: "CELP coding based on mel-cepstral analysis", PROC. IEEE ICASSP'95, 1995, pages 33 - 36
  • AKI HÄRMÄ; UNTO K. LAINE; MATTI KARJALAINEN: "Warped low-delay CELP for wideband audio coding", 17TH INTERNATIONAL AES CONFERENCE, 1999
  • PETER VARY; RAINER MARTIN: "Digital Speech Transmission: Enhancement, Coding and Error Concealment", 2006, JOHN WILEY & SONS, LTD
  • K. KOISHIDA ET AL.: "CELP coding system based on mel-generalized cepstral analysis", PROC. ICSLP'96, 1996, pages 318 - 321
  • K. KOISHIDA ET AL.: "A wideband CELP speech coder at 16 kbit/s based on mel-generalized cepstral analysis", PROC. IEEE ICASSP'98, 1998, pages 161 - 164
  • B. BESSETTE; R. LEFEBVRE; R. SALAMI: "UNIVERSAL SPEECH/AUDIO CODING USING HYBRID ACELP/TCX TECHNIQUES", PROC. IEEE ICASSP 2005, 2005, pages 301 - 304

Citation (search report)

  • [XA] TANCEREL L ET AL: "Combined speech and audio coding by discrimination", SPEECH CODING, 2000. PROCEEDINGS. 2000 IEEE WORKSHOP ON SEPTEMBER 17-20, 2000, PISCATAWAY, NJ, USA,IEEE, 17 September 2000 (2000-09-17), pages 154 - 156, XP010520073, ISBN: 0-7803-6416-3
  • [X] JOON-HYUK CHANG ET AL: "Speech enhancement using warped discrete cosine transform", SPEECH CODING, 2002, IEEE WORKSHOP PROCEEDINGS. OCT. 6-9, 2002, PISCATAWAY, NJ, USA,IEEE, 6 October 2002 (2002-10-06), pages 175 - 177, XP010647252, ISBN: 0-7803-7549-1

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

DOCDB simple family (publication)

EP 1873754 A1 20080102; EP 1873754 B1 20080910; AT E408217 T1 20080915; DE 602006002739 D1 20081023; EP 1990799 A1 20081112; HK 1109817 A1 20080620

DOCDB simple family (application)

EP 06013604 A 20060630; AT 06013604 T 20060630; DE 602006002739 T 20060630; EP 08014723 A 20060630; HK 08103465 A 20080327