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    COMPRESSION OF MULTIPLE SUBCHANNEL VOICE SIGNALS
    13.
    发明专利
    COMPRESSION OF MULTIPLE SUBCHANNEL VOICE SIGNALS 未知

    公开(公告)号：NZ301168A

    公开(公告)日：1998-01-26

    申请号：NZ30116896

    申请日：1996-01-11

    Applicant: MOTOROLA INC

    Inventor： LEITCH CLIFFORD DANA ,  SCHWENDEMAN ROBERT JOHN ,  SIWIAK KAZIMIERZ ,  KUZNICKI WILLIAM JOSEPH ,  SATYAMURTI SUNIL

    IPC: G10L19/00 ,  H04B1/66 ,  H04J1/14

    Abstract: The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system (100). The method comprises the steps of subchanneling the voice communication resource into a plurality of subchannels (441, 442, 443), placing a pair of the plurality of voice signals (401, 402) on a subchannel (441); modulating the pair of the plurality of voice signals (401, 402) about a pilot signal (581) within the subchannel (441) using single sideband modulation; and compressing the time of each of the voice signals (401, 402) within the plurality of subchannels (441, 442, 443), wherein these step provide a compressed voice signal.

    Method and apparatus for encoding and decoding a digital radio signal
    15.
    发明专利
    Method and apparatus for encoding and decoding a digital radio signal 未知

    公开(公告)号：ZA953557B

    公开(公告)日：1996-01-25

    申请号：ZA953557

    申请日：1995-05-03

    Applicant: MOTOROLA INC

    Inventor： LEITCH CLIFFORD DANA

    IPC: H03M13/27 ,  H04H20/67 ,  H04W88/18 ,  H04L ,  H03M

    Abstract: A selective call receiver (105) for use in a selective call communication system (100) and a controller (206). The receiver (203) is for receiving and demodulating a digital signal which includes a predetermined sequence of AxN interleaved symbols representing a non-interleaved set of N tiers of symbols, each tier having A symbols, wherein A and N are positive integers. The controller (206) includes a deinterleaver (830) which reconstructs the non-interleaved set of N tiers of symbols from the demodulated signal, and a decoder (950) detects and corrects errors in the deinterleaved set of N tiers of symbols. The digital signal is transmitted simultaneously from two transmitters (103) having a difference frequency 1/P, and the symbols are transmitted at a rate of SPS symbols per second. The period of the difference frequency is given by P=(AxN)/SPS.

    METHOD AND APPARATUS FOR ADAPTIVELY SELECTING A COMMUNICATION STRATEGY IN A SELECTIVE CALL RADIO COMMUNICATION SYSTEM
    17.
    发明专利
    METHOD AND APPARATUS FOR ADAPTIVELY SELECTING A COMMUNICATION STRATEGY IN A SELECTIVE CALL RADIO COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2212817C

    公开(公告)日：2002-05-21

    申请号：CA2212817

    申请日：1996-01-11

    Applicant: MOTOROLA INC

    Inventor： LEITCH CLIFFORD DANA ,  SCHWENDEMAN ROBERT JOHN ,  MACNAK PHILIP PAUL

    IPC: H04W76/04 ,  H04B7/005 ,  H04L1/00 ,  H04L1/18 ,  H04W52/18 ,  H04W88/18 ,  H04Q7/08 ,  H04Q7/12

    Abstract: A method and apparatus adaptively selects a communication strategy for communicating a message in a selective call radio communication system including a fixed portion (100) and a portable portion (101). The fixed portion (100) transmits (402) an alert signal to the portable portion (101), and awaits (404) an acknowledgment signal including a signal quality estimate from the portable portion (101). The portable portion (101) receives (602) the alert signal, and computes (604, 606) the signal quality estimate therefrom. The portable portion (101) then sends (608) the acknowledgment signal to the fixed portion (100). In response to the acknowledgment signal, the fixed portion (100) selects (407) a transmission strategy in accordance with the signal quality estimate. For compatibility, the transmission strategy requires a matching reception strategy in the portable portion (101). After sending the acknowledgment signal, the portable portion (101) selects (609) the matching reception strategy in accordance with the signal quality estimate sent in the acknowledgment signal without requiring further communication with the fixed portion (100).

    METHOD OF AND APPARATUS FOR ADAPTIVELY SELECTING APPROPRIATE COMMUNICATION STRATEGY IN A SELECTIVE-CALLING RADIO COMMUNICATION SYSTEM
    18.
    发明专利
    METHOD OF AND APPARATUS FOR ADAPTIVELY SELECTING APPROPRIATE COMMUNICATION STRATEGY IN A SELECTIVE-CALLING RADIO COMMUNICATION SYSTEM 未知

    公开(公告)号：PL321958A1

    公开(公告)日：1998-01-05

    申请号：PL32195896

    申请日：1996-01-11

    Applicant: MOTOROLA INC

    Inventor： LEITCH CLIFFORD DANA ,  SCHWENDEMAN ROBERT JOHN ,  MACNAK PHILIP PAUL

    IPC: H04B7/005 ,  H04L1/00 ,  H04L1/18 ,  H04W76/04 ,  H04W52/18 ,  H04W88/18 ,  H04B7/26 ,  H04K1/02

    Abstract: A method and apparatus adaptively selects a communication strategy for communicating a message in a selective call radio communication system including a fixed portion (100) and a portable portion (101). The fixed portion (100) transmits (402) an alert signal to the portable portion (101), and awaits (404) an acknowledgment signal including a signal quality estimate from the portable portion (101). The portable portion (101) receives (602) the alert signal, and computes (604, 606) the signal quality estimate therefrom. The portable portion (101) then sends (608) the acknowledgment signal to the fixed portion (100). In response to the acknowledgment signal, the fixed portion (100) selects (407) a transmission strategy in accordance with the signal quality estimate. For compatibility, the transmission strategy requires a matching reception strategy in the portable portion (101). After sending the acknowledgment signal, the portable portion (101) selects (609) the matching reception strategy in accordance with the signal quality estimate sent in the acknowledgment signal without requiring further communication with the fixed portion (100).

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