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    DETERMINING THE EFFECTS OF NEW TYPES OF IMPAIRMENTS ON PERCEIVED QUALITY OF A VOICE SERVICE
    1.
    发明专利
    DETERMINING THE EFFECTS OF NEW TYPES OF IMPAIRMENTS ON PERCEIVED QUALITY OF A VOICE SERVICE 未知

    公开(公告)号：CA2448563A1

    公开(公告)日：2002-12-05

    申请号：CA2448563

    申请日：2002-05-23

    Applicant: WORLDCOM INC

    Inventor： HARDY WILLIAM CHRISTOPHER

    IPC: H04M3/24 ,  H04J99/00 ,  H04L12/24 ,  H04M3/00 ,  H04M3/22 ,  H04M3/26 ,  H04J1/12 ,  H04J3/10 ,  H04J15/00

    Abstract: Where a first communication service exhibits a first performance characteristic affecting communication quality and a second communication service exhibits both the first performance characteristic and a second performance characteristic not exhibited by the first communication service, a method for determination the effect of the second performance characteristic upon the quality of the second communication service comprising the steps: Establishing communications via the second communications service (702); Obtaining objective measures of the first performance characteristic as the second performance characteristic varies (704); Converting the objective measurement of the first performance characteristic into subjective rating based upon knowledge of the first communication service (706, 708, 710); Altering the subjective ratings to reflect the effects of the second performance characteristic by use of an assumed model for the effects of the second performance characteristic upon the subjective ratings of the first performance characteristic (712); Computing quality index values from the altered subjective ratings (712); and Adjusting the assume model to improve the correlation between the quality index values and the second performance characteristic (714)

    TEST UNIT FOR USE AT A NETWORK INTERFACE DEVICE
    3.
    发明专利
    TEST UNIT FOR USE AT A NETWORK INTERFACE DEVICE 未知

    公开(公告)号：CA2412616A1

    公开(公告)日：2001-12-20

    申请号：CA2412616

    申请日：2000-06-14

    Applicant: MCI WORLDCOM INC

    Inventor： HARDY WILLIAM CHRISTOPHER ,  GUPTA VAIKUNTH N

    IPC: H04M1/24 ,  H04M3/30 ,  H04M3/54 ,  H04Q1/02

    Abstract: A test unit provides testing capability at a network interface device (NID). The test unit may be remotely activated so that testing is initiated upon activation from a remote site. In one embodiment, a characteristic signal is sent over a telephone line toward the NID. A characteristic signal is detect ed and the testing unit is activated. The testing unit may perform multiple typ es of tests, including tests for detecting line loss, line noise and latency. T he test unit may be implemented using electronic circuitry or using an intelligent computer system.

    6.
    发明专利
    未知

    公开(公告)号：BR0206997A

    公开(公告)日：2004-08-17

    申请号：BR0206997

    申请日：2002-02-07

    Applicant: WORLDCOM INC

    Inventor： HARDY WILLIAM CHRISTOPHER

    IPC: H04L12/24 ,  H04L12/26 ,  H04L12/56 ,  H04L29/06 ,  H04M3/22 ,  H04M7/00 ,  H04L12/66 ,  H04L12/28 ,  G01R31/08 ,  H04M11/00

    Abstract: A method and apparatus for determining what level of performance must be maintained by a second communication service so as to be perceived as being of equal quality to a first communication service, especially where the second communication service is subject to additional impairments not experienced by the first communication service. In one example embodiment, the present invention is applied to determining what combinations of packet loss rate and packet delay are tolerable where a packet switched telephony service is desired to be perceived to be substantially equivalent to a traditional toll-quality non-packet-switched telephone service. Empirically derived models are used to relate user perception to objectively measurable characteristics, such as packet loss rate.

    Method and system for evaluating the quality of packet-switched voice signals
    9.
    发明专利
    Method and system for evaluating the quality of packet-switched voice signals 未知

    公开(公告)号：AU2002326288A1

    公开(公告)日：2002-12-09

    申请号：AU2002326288

    申请日：2002-02-07

    Applicant: WORLDCOM INC

    Inventor： HARDY WILLIAM CHRISTOPHER

    IPC: H04L12/24 ,  H04L12/26 ,  H04L12/56 ,  H04L29/06 ,  H04M3/22 ,  H04M7/00 ,  H04L12/66 ,  G01R31/08 ,  H04M11/00 ,  H04L12/28

    Abstract: A method and apparatus for determining what level of performance must be maintained by a second communication service so as to be perceived as being of equal quality to a first communication service, especially where the second communication service is subject to additional impairments not experienced by the first communication service. In one example embodiment, the present invention is applied to determining what combinations of packet loss rate and packet delay are tolerable where a packet switched telephony service is desired to be perceived to be substantially equivalent to a traditional toll-quality non-packet-switched telephone service. Empirically derived models are used to relate user perception to objectively measurable characteristics, such as packet loss rate.

    METHOD AND SYSTEM FOR EVALUATING THE QUALITY OF PACKET-SWITCHED VOICE SIGNALS
    10.
    发明专利
    METHOD AND SYSTEM FOR EVALUATING THE QUALITY OF PACKET-SWITCHED VOICE SIGNALS 未知

    公开(公告)号：CA2435701A1

    公开(公告)日：2002-12-05

    申请号：CA2435701

    申请日：2002-02-07

    Applicant: WORLDCOM INC

    Inventor： HARDY WILLIAM CHRISTOPHER

    IPC: H04L12/24 ,  H04L12/26 ,  H04L12/56 ,  H04L29/06 ,  H04M3/22 ,  H04M7/00 ,  H04L12/66 ,  H04M11/00 ,  G01R31/08 ,  H04L12/28

    Abstract: A method and apparatus for determining what level of performance must be maintained by a second communication service (910) so as to be perceived as being of equal quality to a first communication service, especially where th e second communication service (910) is subject to additional impairments (972 ) not experienced by the first communication service. In one example embodimen t, the present invention is applied to determining what combinations of packet loss rate (968) and packet delay are tolerable where a packet switched telephony service is desired to be perceived to be substantially equivalent to a traditional toll-quality non-packet switched telephone service. Empiricall y derived models (940) are used to relate user perception to objectively measurable characteristics, such as packet loss rate (968).

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