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    METHOD AND APPARATUS FOR DETECTION AND BYPASS OF TANDEM VOCODING
    82.
    发明专利
    METHOD AND APPARATUS FOR DETECTION AND BYPASS OF TANDEM VOCODING 未知

    公开(公告)号：CA2211463A1

    公开(公告)日：1996-08-01

    申请号：CA2211463

    申请日：1996-01-25

    Applicant: QUALCOMM INC

    Inventor： DEJACO ANDREW P ,  WEAVER LINDSAY A JR ,  GARDNER WILLIAM R ,  JACOBS PAUL E ,  LAM S KATHERINE ,  SIH GILBERT C

    IPC: G10L11/02 ,  G10L19/00 ,  G10L19/14 ,  H04B7/26 ,  H04B14/04 ,  H04Q11/04 ,  H04W88/18 ,  G10L9/18 ,  H04Q7/24

    Abstract: A first remote vocoder (15) receives analog voice (170) and produces packetized vocoder data (190) which is transmitted over a wireless link (20). A first local vocoder (35) receives the packetized vocoder data (190) from the wireless link (20). The first local vocoder (35) converts the packetized data (190) to a multibit PCM output (120). The first local vocoder (35) also adds a detection code to one of the least significant bits (LSB) of the PCM output (210). The first local vocoder (35) passes the PCM signal (210) to the PSTN (40). The first local vocoder (210) also receives PCM input (120) over the PSTN (40). The first local vocoder (35) constantly monitors the least significant bit of the PCM input (120) for a detection code indicating that a second local vocoder (55) is connected at the receiving end. If the first local vocoder (35) detects the detection code from the second local vocoder (55), it begins to substitute packetized data and a redundancy check for a second one of the LSB's of the outgoing PCM (210). The first local vocoder (35) also begins to monitor the second one of the LSB's of the incoming PCM (120). If the redundancy check indicates that valid packetized data has been received, the first local vocoder (35) stops converting the PCM output (120) into packetized data and simply passes the packetized data on the second one of the LSB's to the first remote vocoder (15) as packets (100). If at any time the redundancy check fails and the detection code is not detected, the first local vocoder (35) returns to converting the incoming PCM (190) to packetized data. In this way, the tandem vocoding arrangement is avoided.

    83.
    发明专利
    未知

    公开(公告)号：FI962034A

    公开(公告)日：1996-07-12

    申请号：FI962034

    申请日：1996-05-13

    Applicant: QUALCOMM INC

    Inventor： PROPACH DAVID S ,  GROB MATTHEW S ,  JACOBS PAUL E ,  KARMI GADI

    IPC: H04M11/00 ,  H04N20060101 ,  H04N1/00 ,  H04N1/32 ,  H04N1/327 ,  H04N1/333 ,  H04N1/41 ,  H04N1/411 ,  H04N

    Abstract: In a method for minimizing a data bottleneck in a Low Data Rate Network (LDRN) (34), i.e. a facsimile network having a transmission rate less than the data rate of the facsimile machines serviced by the network, the LDRN (34) has a one-dimensional image data format and a two-dimensional image data format. The method comprises processing the facsimile transmissions in order to make the data rates of the LDRN and the FAX machines compatible, thereby minimizing any potential facsimile data bottlenecks that may occur in the LDRN due to its slower data rate. In the method, a first facsimile (FAX) machine (12) is set to the one-dimensional image data format; a data stream encoded in the one-dimensional image data format is sent (32) from the first FAX machine (12) to a first side of the LDRN (34); the data stream sent is uncompressed, and the uncompressed data stream is re-encoded into the two-dimensional image data format; the re-encoded data stream is transmitted from the first side of the LDRN (34) to a second side of the LDRN (34); the transmitted data stream is second uncompressed; the second uncompressed data stream is second re-encoded into the one-dimensional image data format; and the re-encoded data stream is second sent (36) from the second side of the LDRN (34) to a second FAX machine (16).

    SYSTEM AND METHOD FOR FACSIMILE DATA TRANSMISSION
    86.
    发明专利
    SYSTEM AND METHOD FOR FACSIMILE DATA TRANSMISSION 未知

    公开(公告)号：CA2176591A1

    公开(公告)日：1995-05-26

    申请号：CA2176591

    申请日：1994-11-15

    Applicant: QUALCOMM INC

    Inventor： PROPACH DAVID S ,  GROB MATTHEW S ,  JACOBS PAUL E ,  KARMI GADI

    IPC: H04M11/00 ,  H04N20060101 ,  H04N1/00 ,  H04N1/32 ,  H04N1/327 ,  H04N1/333 ,  H04N1/41 ,  H04N1/411

    Abstract: System and method for minimizing data bottlenecks in Low Data Rate Networks (LDRNs) that communicate facsimile transmissions, An LDRN is a facsimile network having a transmission data rate less than the data rate of the FAX machines serviced by the network. The system and method can be implemented in any type of LDRN, including analog and digital wired LDRNs, as well as analog and digital wireless (e.g., cellular) LDRNs. The system and method involve processing the facsimile transmissions in order to make the data rates of the LDRN and the FAX machines compatible, thereby minimizing any potential facsimile data bottlenecks that may occur in the LDRN due to its slower data rate.

    METHOD OF AND SYSTEM FOR ORDERING DATA OF AN ENCODER FOR MASKING ERRORS OCCURRING IN A TRANSMISSION CHANNEL
    88.
    发明专利
    METHOD OF AND SYSTEM FOR ORDERING DATA OF AN ENCODER FOR MASKING ERRORS OCCURRING IN A TRANSMISSION CHANNEL 未知

    公开(公告)号：PL305984A1

    公开(公告)日：1995-02-20

    申请号：PL30598493

    申请日：1993-01-26

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R ,  JACOBS PAUL E

    IPC: G10L19/00 ,  G10L19/02 ,  G10L19/06 ,  H03M13/35 ,  H04B1/66 ,  H04L1/00 ,  G10L9/02

    Abstract: A method and system by which parameter data representative of vocoded speech are organized into a data packet for transmission so as to reduce the impact of transmission channel induced errors on the data packet. A data packet is constructed with certain most perceptually significant bits of parameter data at the beginning of the data packet. Following in the data packet are lesser perceptually significant bits of the same parameter data. Other parameter data then follows in the data packet. Interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet are most perceptually significant bits of other parameter data. A parity check code is computed from the most perceptually significant bits in the data packet and also interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet.

    Method and system for the arrangement of vocoder data for the masking of transmission channel induced errors
    89.
    发明专利
    Method and system for the arrangement of vocoder data for the masking of transmission channel induced errors 未知

    公开(公告)号：ZA93450B

    公开(公告)日：1993-12-28

    申请号：ZA93450

    申请日：1993-01-21

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R ,  JACOBS PAUL E

    IPC: G10L19/00 ,  G10L19/02 ,  G10L19/06 ,  H03M13/35 ,  H04B1/66 ,  H04L1/00 ,  G10L

    Abstract: A method and system by which parameter data representative of vocoded speech are organized into a data packet for transmission so as to reduce the impact of transmission channel induced errors on the data packet. A data packet is constructed with certain most perceptually significant bits of parameter data at the beginning of the data packet. Following in the data packet are lesser perceptually significant bits of the same parameter data. Other parameter data then follows in the data packet. Interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet are most perceptually significant bits of other parameter data. A parity check code is computed from the most perceptually significant bits in the data packet and also interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet.

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