Title:
SAMPLE STRING TRANSFORMATION DEVICE, SIGNAL ENCODING DEVICE, SIGNAL DECODING DEVICE, SAMPLE STRING TRANSFORMATION METHOD, SIGNAL ENCODING METHOD, SIGNAL DECODING METHOD, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2018/052004
Kind Code:
A1
Abstract:
The present invention improves the performance of processes for encoding and decoding audio signals. A representative value calculation unit 110 calculates, from the sample string of a frequency region signal that corresponds to an input acoustic signal in each prescribed time interval, the representative value of each frequency interval from the sample value of a sample included in each of the frequency intervals, each of the frequency intervals being derived from a plurality of samples that are fewer in number than the number of frequency samples of the sample string of the frequency range signal. In each of the prescribed time intervals, a signal companding unit 120 acquires, as the sample string of a weighted frequency region signal, a frequency region sample string obtained by multiplying a weight that corresponds to the function value of a representative value derived from a companding function with which an inverse function can be defined, and each of the samples in the frequency region sample string that correspond to the representative value.
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Inventors:
SUGIURA RYOSUKE (JP)
MORIYA TAKEHIRO (JP)
HARADA NOBORU (JP)
KAWANISHI TAKAHITO (JP)
KAMAMOTO YUTAKA (JP)
FURUKADO KOUICHI (JP)
NAKAJIMA JUNICHI (JP)
NAKAYAMA JOUJI (JP)
NOGUCHI KENICHI (JP)
HASEGAWA KEISUKE (JP)
MORIYA TAKEHIRO (JP)
HARADA NOBORU (JP)
KAWANISHI TAKAHITO (JP)
KAMAMOTO YUTAKA (JP)
FURUKADO KOUICHI (JP)
NAKAJIMA JUNICHI (JP)
NAKAYAMA JOUJI (JP)
NOGUCHI KENICHI (JP)
HASEGAWA KEISUKE (JP)
Application Number:
PCT/JP2017/032991
Publication Date:
March 22, 2018
Filing Date:
September 13, 2017
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G10L19/00; G10L19/035; G10L19/26
Foreign References:
| JP2002353820A | 2002-12-06 | |||
| JP2002123298A | 2002-04-26 | |||
| JP2009230154A | 2009-10-08 | |||
| JPH05158495A | 1993-06-25 |
Other References:
GERALD D. T. SCHULLER; BIN YU; DAWEI HUANG; BERND EDLER: "Perceptual Audio Coding Using Adaptive Pre-and Post-Filters and Lossless Compression", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, vol. 10, no. 6, September 2002 (2002-09-01), XP011079662
T. LIEBECHEN; T. MORIYA; N. HARADA; Y. KAMAMOTO; Y. A. REZNIK: "The MPEG-4 Audio Lossless Coding (ALS) standard - technology and applications", PROC. AES 119TH CONVENTION, October 2005 (2005-10-01)
"Lossless compression of G.711 pulse code modulation", ITU-T G.711.0, 2009
See also references of EP 3514791A4
T. LIEBECHEN; T. MORIYA; N. HARADA; Y. KAMAMOTO; Y. A. REZNIK: "The MPEG-4 Audio Lossless Coding (ALS) standard - technology and applications", PROC. AES 119TH CONVENTION, October 2005 (2005-10-01)
"Lossless compression of G.711 pulse code modulation", ITU-T G.711.0, 2009
See also references of EP 3514791A4
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
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