Title:
SIGNAL MODIFICATION METHOD FOR EFFICIENT CODING OF SPEECH SIGNALS
Document Type and Number:
WIPO Patent Application WO2003052744
Kind Code:
A3
Abstract:
For determining a long-term-prediction delay parameter characterizing a long term prediction in a technique using signal modification for digitally encoding a sound signal, the sound signal is divided into a series of successive frames, a feature of the sound signal is located in a previous frame, a corresponding feature of the sound signal is located in a current frame, and the long-term-prediction delay parameter is determined for the current frame while mapping, with the long term prediction, the signal feature of the previous frame with the corresponding signal feature of the current frame. In a signal modification method for implementation into a technique for digitally encoding a sound signal, the sound signal is divided into a series of successive frames, each frame of the sound signal is partitioned into a plurality of signal segments, and at least a part of the signal segments of the frame are warped while constraining the warped signal segments inside the frame. For searching pitch pulses in a sound signal, a residual signal is produced by filtering the sound signal through a linear prediction analysis filter, a weighted sound signal is produced by processing the sound signal through a weighting filter, the weighted sound signal being indicative of signal periodicity, a synthesized weighted sound signal is produced by filtering a synthesized speech signal produced during a last subframe of a previous frame of the sound signal through the weighting filter, a last pitch pulse of the sound signal of the previous frame is located from the residual signal, a pitch pulse prototype of given length is extracted around the position of the last pitch pulse of the sound signal of the previous frame using the synthesized weighted sound signal, and the pitch pulses are located in a current frame using the pitch pulse prototype.
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Inventors:
TAMMI MIKKO (FI)
JELINEK MILAN (CA)
LAFLAMME CLAUDE (CA)
RUOPPILA VESA (CA)
JELINEK MILAN (CA)
LAFLAMME CLAUDE (CA)
RUOPPILA VESA (CA)
Application Number:
PCT/CA2002/001948
Publication Date:
February 05, 2004
Filing Date:
December 13, 2002
Export Citation:
Assignee:
VOICEAGE CORP (CA)
TAMMI MIKKO (FI)
JELINEK MILAN (CA)
LAFLAMME CLAUDE (CA)
RUOPPILA VESA (CA)
TAMMI MIKKO (FI)
JELINEK MILAN (CA)
LAFLAMME CLAUDE (CA)
RUOPPILA VESA (CA)
International Classes:
G10L19/12; (IPC1-7): G10L19/08; G10L19/12; G10L11/04
Foreign References:
| US6449590B1 | 2002-09-10 | |||
| US5974377A | 1999-10-26 | |||
| US20010023395A1 | 2001-09-20 |
Other References:
TAMMI M ET AL: "Signal modification for voiced wideband speech coding and its application for IS-95 system", 2002 IEEE PROCEEDINGS SPEECH CODING WORKSHOP., 6 October 2002 (2002-10-06) - 9 October 2002 (2002-10-09), IBARAKI, JAPAN, Piscataway, NJ, USA, IEEE, USA, pages 35 - 37, XP002250153, ISBN: 0-7803-7549-1
CHUI S P ET AL: "Low delay CELP coding at 8 kbps using classified voiced and unvoiced excitation codebooks", PROCEEDINGS OF ICSIPNN '94. INTERNATIONAL CONFERENCE ON SPEECH, IMAGE PROCESSING AND NEURAL NETWORKS (CAT. NO.94TH0638-7), 13 April 1994 (1994-04-13) - 16 April 1994 (1994-04-16), HONG KONG, New York, NY, USA, IEEE, USA, pages 472 - 475 vol.2, XP002250152, ISBN: 0-7803-1865-X
CHUI S P ET AL: "Low delay CELP coding at 8 kbps using classified voiced and unvoiced excitation codebooks", PROCEEDINGS OF ICSIPNN '94. INTERNATIONAL CONFERENCE ON SPEECH, IMAGE PROCESSING AND NEURAL NETWORKS (CAT. NO.94TH0638-7), 13 April 1994 (1994-04-13) - 16 April 1994 (1994-04-16), HONG KONG, New York, NY, USA, IEEE, USA, pages 472 - 475 vol.2, XP002250152, ISBN: 0-7803-1865-X
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