Title:
ENCODING DEVICE, DECODING DEVICE, SMOOTHING DEVICE, REVERSE-SMOOTHING DEVICE, METHODS THEREFOR, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2018/225412
Kind Code:
A1
Abstract:
The present invention makes it possible to obtain a logarithmic-spectral envelope sequence L0,L1,…,LN-1, which is a numerical sequence corresponding to the log base 2 of each sampled data in a spectral envelop sequence and the sum of which is zero, and an envelope code therefor. In a quantized spectral sequence ^X0,^X1,…,^XN-1, a smoothed spectral sequence ~Xk is created by subtracting the numerical value of Lkth digit from the least significant digit of ^Xk when Lk is positive, ~Xk is created by adding the numerical value of −Lkth digit to the least significant digit of ^Xk when Lk is negative in accordance with a predetermined rule, and when Lk is zero, a smoothed spectral sequence ~X0,~X1,…,~XN-1 is created by setting ^Xk to ~Xk, to thus produce a signal code by encoding each sample with fixed length.
Inventors:
SUGIURA RYOSUKE (JP)
KAMAMOTO YUTAKA (JP)
MORIYA TAKEHIRO (JP)
KAMAMOTO YUTAKA (JP)
MORIYA TAKEHIRO (JP)
Application Number:
PCT/JP2018/016564
Publication Date:
December 13, 2018
Filing Date:
April 24, 2018
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G10L19/035
Foreign References:
| JP2016200750A | 2016-12-01 |
Other References:
MORIYA, TAKEHIRO ET AL.: "Progress in LPC-based frequency-domain audio coding", APSIPA TRANSACTIONS ON SIGNAL AND INFORMATION PROCESSING, vol. 5, 31 May 2016 (2016-05-31), pages 1 - 10, XP055336101, [retrieved on 20180628]
FERREIRA, A. J. S .: "Combined spectral envelope normalization and subtraction of sinusoidal components in the ODFT and MDCT frequency domains", 2001 IEEE WORKSHOP ON THE APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 21 October 2001 (2001-10-21), pages 51 - 54, XP010566872
BACKSTROM, T. ET AL.: "Arithmetic coding of speech and audio spectra using TCX based on linear predictive spectral envelopes", 2015 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), 19 April 2015 (2015-04-19), pages 5127 - 5131, XP033064629
T. BACKSTROMC.R. HELMRICH: "Arithmetic encoding of speech and audio spectra using tcx based on linear predictive spectral envelopes", PROC. ICASSP 2015, April 2015 (2015-04-01), pages 5127 - 5131
See also references of EP 3637418A4
FERREIRA, A. J. S .: "Combined spectral envelope normalization and subtraction of sinusoidal components in the ODFT and MDCT frequency domains", 2001 IEEE WORKSHOP ON THE APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 21 October 2001 (2001-10-21), pages 51 - 54, XP010566872
BACKSTROM, T. ET AL.: "Arithmetic coding of speech and audio spectra using TCX based on linear predictive spectral envelopes", 2015 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP), 19 April 2015 (2015-04-19), pages 5127 - 5131, XP033064629
T. BACKSTROMC.R. HELMRICH: "Arithmetic encoding of speech and audio spectra using tcx based on linear predictive spectral envelopes", PROC. ICASSP 2015, April 2015 (2015-04-01), pages 5127 - 5131
See also references of EP 3637418A4
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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