Title:
ENCODING DEVICE, DECODING DEVICE, ENCODING METHOD, DECODING METHOD, ENCODING PROGRAM, DECODING PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2015/166693
Kind Code:
A1
Abstract:
This invention provides an encoding device and a decoding device that make it possible, with a small encoded size, to reproduce a frequency-domain envelope sequence that exhibits good approximation precision in the vicinity of a peak due to the pitch period of an audio signal. This encoding device has a periodic-combined-envelope generation unit and a variable-length-encoding unit. Said periodic-combined-envelope generation unit generates a periodic combined-envelope sequence, said periodic combined-envelope sequence being a frequency-domain sequence based on the following: a spectral-envelope sequence, said spectral-envelope sequence being a frequency-domain sequence corresponding to linear-prediction-coefficient symbols obtained from an input audio signal; and a frequency-domain period. The variable-length-encoding unit encodes a frequency-domain sequence derived from the input audio signal. This decoding device has a periodic-combined-envelope generation unit and a variable-length-decoding unit. Said periodic-combined-envelope generation unit generates a periodic combined-envelope sequence, said periodic combined-envelope sequence being a frequency-domain sequence based on the following: a spectral-envelope sequence, said spectral-envelope sequence being a frequency-domain sequence corresponding to the abovementioned linear-prediction-coefficient symbols; and the abovementioned frequency-domain period. The variable-length-decoding unit decodes a variable-length code, yielding a frequency-domain sequence.
Inventors:
MORIYA TAKEHIRO (JP)
KAMAMOTO YUTAKA (JP)
HARADA NOBORU (JP)
KAMAMOTO YUTAKA (JP)
HARADA NOBORU (JP)
Application Number:
PCT/JP2015/054717
Publication Date:
November 05, 2015
Filing Date:
February 20, 2015
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G10L19/02; G10L19/06; H03M7/40
Domestic Patent References:
| WO2012137617A1 | 2012-10-11 |
Foreign References:
| JPS58168094A | 1983-10-04 | |||
| JPS5994795A | 1984-05-31 |
Other References:
See also references of EP 3139380A4
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
Naoki Nakao (JP)
Naoki Nakao (JP)
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