Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2011-07-26
2011-07-26
Sheikh, Ayaz R (Department: 2476)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S229000, C370S241000, C704S500000, C704SE19008, C709S224000
Reexamination Certificate
active
07986634
ABSTRACT:
Provided are a method and apparatus for measuring sound quality in a variable band multi-codec. The sound quality measurement apparatus includes: a recording file receiving/generating unit receiving a first recording file in which a natural sound is recorded, and a second recording file obtained by converting the natural sound into digital data using the variable band multi-codec, receiving information obtained by encoding the natural sound using the variable band multi-codec, in the format of a Real Time Protocol (RTP) packet, unpacking the RTP packet, decoding the RTP packet using the variable band multi-codec, and generating a third recording file; a Mean Opinion Score (MOS) value calculating unit repeatedly selecting a file from among the first recording file, the second recording file, and the third recording file, or selecting two files from among the first recording file, the second recording file, and the third recording file, and calculating a MOS value by obtaining a difference between the selected results; and a MOS value comparison unit comparing a plurality of MOS values generated by the MOS value calculating unit, with each other, and detecting a cause of sound quality deterioration.
REFERENCES:
patent: 5657420 (1997-08-01), Jacobs et al.
patent: 7002992 (2006-02-01), Shaffer et al.
patent: 2001/0012368 (2001-08-01), Yamazaki
patent: 2004/0160979 (2004-08-01), Pepin et al.
patent: 2002-064539 (2002-02-01), None
patent: 1020000025237 (2000-05-01), None
patent: 1020030019839 (2003-03-01), None
patent: 1020040060605 (2004-07-01), None
Shulzrinne et al., RFC 3550, RTP: A Transport Protocol for Real-Time Applications, Jul. 2003, pp. 1-91.
“Objective quality measurement of telephone-band (300-3400 Hz) speech codecs”, International Telecommunication Union ITU-T Telecommunication Standardization Sector of ITU Recommendation p. 861, Aug. 1996, pp. 1-7.
J Rosenberg, et al; “An Offer/Answer Model with the Session Description Protocol (SDP);”The Internet Society(2002).
Jung Hae Won
Kang Tae-Gyu
Kim Dae-Ho
Kim Do Young
Koo Ki-Jong
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Sheikh Ayaz R
Sloms Nicholas
LandOfFree
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