Title:
PERIODIC-COMBINED-ENVELOPE-SEQUENCE GENERATION DEVICE, PERIODIC-COMBINED-ENVELOPE-SEQUENCE GENERATION METHOD, PERIODIC-COMBINED-ENVELOPE-SEQUENCE GENERATION PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2015/166694
Kind Code:
A1
Abstract:
This invention provides an envelope sequence that exhibits high approximation precision in the vicinity of a peak due to the pitch period of an audio signal. Using, as an input audio signal, a time-domain digital audio signal divided into frames, i.e. prescribed time intervals, this periodic-combined-envelope-sequence generation device generates an envelope sequence, namely a periodic combined-envelope sequence. This periodic-combined-envelope-sequence generation device has, at least, a spectral-envelope-sequence calculation unit and a periodic-combined-envelope generation unit. The spectral-envelope-sequence calculation unit calculates a spectral-envelope sequence for the input audio signal on the basis of time-domain linear prediction performed on said input audio signal. On the basis of frequency-domain periodic components in the input audio signal, the periodic-combined-envelope generation unit obtains a periodic combined-envelope sequence by changing the shape of an amplitude spectral-envelope sequence.
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Inventors:
MORIYA TAKEHIRO (JP)
KAMAMOTO YUTAKA (JP)
HARADA NOBORU (JP)
KAMAMOTO YUTAKA (JP)
HARADA NOBORU (JP)
Application Number:
PCT/JP2015/054718
Publication Date:
November 05, 2015
Filing Date:
February 20, 2015
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G10L19/06
Foreign References:
| JPS58168094A | 1983-10-04 | |||
| JPS5994795A | 1984-05-31 |
Other References:
See also references of EP 3139381A4
Attorney, Agent or Firm:
NAKAO, Naoki et al. (JP)
Naoki Nakao (JP)
Naoki Nakao (JP)
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