Title:
CALL QUALITY EVALUATION METHOD, CALL QUALITY EVALUATION DEVICE AND CALL QUALITY EVALUATION PROGRAM
Document Type and Number:
WIPO Patent Application WO/2016/208168
Kind Code:
A1
Abstract:
The present invention addresses the problem of, when estimating call quality deterioration, obtaining the subjective quality of experience of a voice call with higher accuracy by using a method with few drawbacks as each of methods for estimating call quality deteriorations due to delay and sound quality deterioration, respectively. To solve this problem, a first deterioration value indicating call quality deterioration due to delay caused in a voice signal by transmission/reception processing via a network is derived, and a second deterioration value indicating call quality deterioration due to sound quality deterioration caused in the voice signal by the transmission/reception processing is derived. Further, an element of an ordered set having an order relation corresponding to call quality is outputted, the element being associated with a combination of the first and second deterioration values by surjection.
Inventors:
NIHEI KOICHI (JP)
Application Number:
PCT/JP2016/002926
Publication Date:
December 29, 2016
Filing Date:
June 17, 2016
Export Citation:
Assignee:
NEC CORP (JP)
International Classes:
H04M1/24; H04M7/00
Foreign References:
| JP2007013674A | 2007-01-18 |
Other References:
"G.107 (02/14)The E-model: a computational model for use in transmission planning", ITU-T KIKAKU BUNSHO (SERIES G) G.107, February 2014 (2014-02-01), XP055341340, Retrieved from the Internet [retrieved on 20160719]
"P.563 (05/04)Single-ended method for objective speech quality assessment in narrow-band telephony applications This Recommendation includes an electronic attachment containing an ANSI-C reference implementation and conformance testing data", ITU-T KIKAKU BUNSHO (SERIES P) P.563, May 2004 (2004-05-01), XP055341343, Retrieved from the Internet [retrieved on 20160719]
"P.563 (05/04)Single-ended method for objective speech quality assessment in narrow-band telephony applications This Recommendation includes an electronic attachment containing an ANSI-C reference implementation and conformance testing data", ITU-T KIKAKU BUNSHO (SERIES P) P.563, May 2004 (2004-05-01), XP055341343, Retrieved from the Internet
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Naoki Shimosaka (JP)
Download PDF: