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    METHOD AND APPARATUS FOR DETERMINING APPROPRIATE CHANNELS FOR COMMUNICATION
    2.
    发明申请
    METHOD AND APPARATUS FOR DETERMINING APPROPRIATE CHANNELS FOR COMMUNICATION 审中-公开
    用于确定通信的适当通道的方法和装置

    公开(公告)号：WO2008057688A2

    公开(公告)日：2008-05-15

    申请号：PCT/US2007080668

    申请日：2007-10-08

    Applicant: MOTOROLA INC ,  BUCHWALD GREGORY J ,  ECKLUND LAWRENCE M ,  GILLIG STEVEN F ,  MANSFIELD TERRY K

    Inventor： BUCHWALD GREGORY J ,  ECKLUND LAWRENCE M ,  GILLIG STEVEN F ,  MANSFIELD TERRY K

    IPC: H04W16/14 ,  H04W16/16 ,  H04W72/08 ,  H04W84/10

    CPC classification number: H04W16/14 ,  H04W16/16 ,  H04W72/08 ,  H04W84/10

    Abstract: During operation of a secondary communication system, nodes having different channel monitoring capabilities or requirements will cooperatively monitor possible frequencies for transmissions, each node using only a subset of all possible modulation sensing schemes. All nodes will share channel occupancy information to other nodes within the communication system. For example, a first group of nodes may monitor possible frequencies for television transmissions, while a second group of nodes may monitor the possible frequencies for APCO 25 transmissions. A group of nodes may also cooperatively monitor possible frequencies for more than one type of modulation transmission. Channel information will be shared among the nodes.

    Abstract translation: 在二次通信系统的操作期间，具有不同信道监测能力或需求的节点将协同地监测传输的可能频率，每个节点仅使用所有可能的调制感测方案的子集。 所有节点将共享信道占用信息到通信系统内的其他节点。 例如，第一组节点可以监视电视传输的可能频率，而第二组节点可监视APCO 25传输的可能频率。 一组节点还可以协作地监视多于一种类型的调制传输的可能频率。 频道信息将在节点之间共享。

    4.
    发明专利
    未知

    公开(公告)号：DE68922006D1

    公开(公告)日：1995-05-11

    申请号：DE68922006

    申请日：1989-01-26

    Applicant: MOTOROLA INC

    Inventor： ESPE ROY H ,  ECKLUND LAWRENCE M

    IPC: H03L7/18 ,  H03L7/093 ,  H03L7/10 ,  H03L7/113

    Abstract: There is disclosed a circuit (60) responsive to control signals applied thereto for alternatively sourcing and sinking current at an output which includes a first controlled current source (48) responsive to selective ones of the control signals for sourcing a current of a predetermined magnitude to the output of the circuit; a second controlled current source (50) responsive to other selective ones of the control signals for sinking a current of a predetermined magnitude from the output of the circuit; and a disabling circuit (42, 44) for respectively disabling said first and second controlled current sources whenever the voltage potential at the output of the circuit becomes greater or less than a predetermined value respectively.

    BROADCAST SIGNAL DETECTED INDICATION SYSTEM
    6.
    发明专利
    BROADCAST SIGNAL DETECTED INDICATION SYSTEM 未知

    公开(公告)号：CA1250023A

    公开(公告)日：1989-02-14

    申请号：CA541897

    申请日：1987-07-13

    Applicant: MOTOROLA INC

    Inventor： ECKLUND LAWRENCE M

    IPC: H03J5/00 ,  H03J7/18 ,  H04H20/88 ,  H04B1/16

    Abstract: BROADCAST SIGNAL DETECTED INDICATION SYSTEM In a radio having an in phase multiplier (A) for providing an in phase detected signal, a detection unit for receiving this signal and for determining whether this signal includes any negative polarity components which would indicate that a viable broadcast signal does not exist on the incoming frequency of interest. This detection unit can include a comparator (11) for comparing the incoming signal against a selected reference value. The invention can also include a signal quality evaluation unit (58) for providing either a digital or analog quality signal that can also effect the output and be used by appropriate processing circuitry to further refine the channel selection process.

    7.
    发明专利
    未知

    公开(公告)号：BR8707446A

    公开(公告)日：1988-12-06

    申请号：BR8707446

    申请日：1987-07-20

    Applicant: MOTOROLA INC

    Inventor： ECKLUND LAWRENCE M

    IPC: H03J5/00 ,  H03J7/18 ,  H04H20/88 ,  H04H5/00

    Abstract: In a radio having an in phase multiplier (A) for providing an in phase detected signal, a detection unit for receiving this signal and for determining whether this signal includes any negative polarity components which would indicate that a viable broadcast signal does not exist on the incoming frequency of interest. This detection unit can include a comparator (11) for comparing the incoming signal against a selected reference value. The invention can also include a signal quality evaluation unit (58) for providing either a digital or analog quality signal that can also effect the output and be used by appropriate processing circuitry to further refine the channel selection process.

    DUAL MODE TONE DETECTOR CIRCUIT
    8.
    发明专利
    DUAL MODE TONE DETECTOR CIRCUIT 未知

    公开(公告)号：CA1171139A

    公开(公告)日：1984-07-17

    申请号：CA402280

    申请日：1982-05-05

    Applicant: MOTOROLA INC

    Inventor： ECKLUND LAWRENCE M

    IPC: G01R19/00 ,  G01R19/165 ,  G01R23/177 ,  H04B1/16 ,  H04H1/00 ,  H04H20/49 ,  H04L27/00

    Abstract: A low frequency tone detector filters out undesired frequencies in a received signal, then a latching circuit locks on when a given number of low frequency cycles are detected, having at least a predetermined peak amplitude. Thereafter, only a second given number of missing or low amplitude cycles will reset the latch. When the detector determines that the received signal is weak or of very poor quality, false detect signals are essentially prevented. The circuit is particularly suited to use with AM stereophonic signals where a low frequency tone is added to the difference channel for providing mono/stereo indication and mode switching.

    AM-FM COMBINED STEREO RECEIVER
    10.
    发明专利
    AM-FM COMBINED STEREO RECEIVER 未知

    公开(公告)号：AU1550692A

    公开(公告)日：1992-09-07

    申请号：AU1550692

    申请日：1992-02-04

    Applicant: MOTOROLA INC

    Inventor： ECKLUND LAWRENCE M

    IPC: H03D1/22 ,  H03D3/06 ,  H03D5/00 ,  H04B1/16 ,  H04H1/00 ,  H04H20/49 ,  H04S1/00 ,  H04H5/00

    Abstract: An improved AM-FM combined stereo receiver is provided having a single processor for removing, in the FM mode, arctangent distortion, and in the AM mode, to process the phase term from arctangent to determine Further, the radio includes a single discriminator circuit, wherein, in the FM mode, the discriminator tank circuit is used to convert frequency deviation to baseband audio, and in the AM mode, the discriminator tank circuit is used as the frequency-determining element for the voltage controlled oscillator (VCO), the VCO being used to translate the intermediate frequency (IF) signal to baseband.

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