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    Digital privacy system
    2.
    发明授权
    Digital privacy system 失效
    数字隐私系统

    公开(公告)号：US3639690A

    公开(公告)日：1972-02-01

    申请号：US3639690D

    申请日：1969-09-10

    Applicant: MOTOROLA INC

    Inventor： BRAUN WILLIAM V ,  LEITICH ALBERT J

    IPC: H04K1/00 ,  H04L9/22 ,  H04L9/04

    CPC classification number: H04K1/00 ,  H04L9/0662

    Abstract: A digital voice-privacy system uses a delta modulator to convert voice information to digital data which then is encoded by combining the output of the delta modulator with a digital signal derived from selected stages or a shift register and a programmable code memory with the resultant data train being fed back as the input signal train for the shift register. The output of the last stage of the shift register is the encoded data. The data is decoded by a similar system, with the received signals being supplied to the input of a shift register and programmable code memory circuit comparable to the one used in the encoder to form a decoding signal which is combined with the encoded digital data to provide an output to a delta demodulator, the output of which then is the desired decoded voice information.

    Abstract translation: 数字语音保密系统使用增量调制器将语音信息转换为数字数据，数字数据然后通过将增量调制器的输出与从选定级派生的数字信号或移位寄存器和可编程代码存储器组合而得到编码 列车作为移位寄存器的输入信号列反馈。 移位寄存器的最后一级的输出是编码数据。 数据由类似的系统解码，其中接收到的信号被提供给与编码器中使用的移位寄存器和可编程代码存储器电路相当的输入，以形成与编码的数字数据组合的解码信号，以提供 输出到Δ解调器，其输出然后是期望的解码语音信息。

    Radio telephone system
    4.
    发明授权
    Radio telephone system 失效
    无线电话系统

    公开(公告)号：US3906166A

    公开(公告)日：1975-09-16

    申请号：US40372573

    申请日：1973-10-17

    Applicant: MOTOROLA INC

    Inventor： COOPER MARTIN ,  DRONSUTH RICHARD W ,  LEITICH ALBERT J ,  LYNK JR CHARLES N ,  MIKULSKI JAMES J ,  MITCHELL JOHN F ,  RICHARDSON ROY A ,  SANGSTER JOHN H

    IPC: H04B1/50 ,  H04W84/04 ,  H04Q7/00

    CPC classification number: H04W84/042 ,  H04B1/50 ,  Y02D70/40

    Abstract: A portable duplex radio telephone system includes at least one base station transmitter having a predetermined base transmission range, and a plurality of portable or mobile units each having a predetermined portable maximum transmission range predeterminately shorter than the base transmission range. Satellite receivers are deployed about the base station within the base station transmission range for receiving transmissions from the portable units. The base station transmitter transmits signals on a signalling channel and on at least one communications channel. Each transmitter signalling and communications channel has a frequency that is paired or associated with a receiving frequency of the satellite receivers. In a multiple base station system, the portable receiver has means for scanning the base station transmitter signalling frequencies and for tuning the portable transmitter to the signalling frequency associated with the frequency of the strongest signalling signal received from the base transmitter. When communication is initiated, the portable transmitter and receiver are automatically retuned to one of the communications channels as determined by the strongest signalling frequency received by the portable receiver and by channel availability. Means are also provided in the system to continuously locate a portable unit and switch the operating frequency thereof as the portable unit moves between base station transmitter coverage areas. Further means are provided to automatically reduce the output power of each portable transmitter to the minimum level required for satisfactory communications in order to reduce battery drain and the interference caused by the portable transmitters.

    Abstract translation: 一种便携式双工无线电话系统包括至少一个具有预定基本传输范围的基站发射机，以及多个便携式或移动单元，每个便携式或移动单元具有预定的比基本传输范围短的便携式最大传输范围。 在基站传输范围内围绕基站部署卫星接收机，用于接收来自便携式装置的传输。 基站发射机在信令信道和至少一个通信信道上发送信号。 每个发射机信令和通信信道具有与卫星接收机的接收频率配对或相关联的频率。 在多基站系统中，便携式接收机具有用于扫描基站发射机信令频率并用于将便携式发射机调谐到与从基站发射机接收的最强信令信号的频率相关联的信令频率的装置。 当通信被启动时，便携式发射机和接收机被自动重新转移到通过便携式接收机接收的最强的信令频率和信道可用性所确定的通信信道之一。 系统中还提供了在便携式单元在基站发射机覆盖区域之间移动时连续定位便携式单元并切换其工作频率的手段。 提供了进一步的手段来自动将每个便携式发射机的输出功率降低到令人满意的通信所需的最低水平，以便减少电池消耗和由便携式发射机引起的干扰。

    RADIOTELEPHONE SYSTEM EMPLOYING DIGITIZED SPEECH DATA SIGNALLING
    5.
    发明专利
    RADIOTELEPHONE SYSTEM EMPLOYING DIGITIZED SPEECH DATA SIGNALLING 未知

    公开(公告)号：CA1259659A

    公开(公告)日：1989-09-19

    申请号：CA514356

    申请日：1986-07-22

    Applicant: MOTOROLA INC

    Inventor： LEVINE STEPHEN N ,  LEITICH ALBERT J

    IPC: H04J3/06 ,  H04L7/04 ,  H04L7/10 ,  G06F11/00

    Abstract: RADIOTELEPHONE SYSTEM EMPLOYING DIGITIZED SPEECH/DATA AND EMBEDDED SIGNALLING A radiotelephone system is disclosed in which the signalling protocol for the system is embedded in the frame synchronization of the digital messages transmitted on the system. Multiple system state control functions are accomplished via a high autocorrelation, low cross correlation bit sequence synchronization signal. System state communication is achieved by utilizing a sequence of normal synchronization words and their ones complement inverses. Reliabilty of the coding is achieved by detecting normal or inverse words as binary levels when fewer than a predetermined number of bit errors exist in the bit sequence. If the predetermined number of bit errors is exceeded, a selected binary one or zero is substituted. This selected sequence of binary levels is decoded and the Hamming distance between a masked decoded sequence and a masked selected sequence is calculated. If the Hamming distance calculation yields a number greater than the error correction capability of the coding function, a new set of substituted binary levels is tried, otherwise the decoded sequence is accepted as correct.

    RADIO TELEPHONE SYSTEM
    6.
    发明专利
    RADIO TELEPHONE SYSTEM 未知

    公开(公告)号：CA1039362A

    公开(公告)日：1978-09-26

    申请号：CA288272

    申请日：1977-10-06

    Applicant: MOTOROLA INC

    Inventor： COOPER MARTIN ,  DRONSUTH RICHARD W ,  LEITICH ALBERT J ,  LYNK CHARLES N JR ,  MIKULSKI JAMES J ,  MITCHELL JOHN F ,  RICHARDSON ROY A ,  SANGSTER JOHN H

    IPC: H04B7/12

    Abstract: A portable duplex radio telephone system includes base station transmitters having a predetermined base transmission range, and a plurality of portable or mobile units each having a predetermined maximum transmission range shorter than the base transmission range. Satellite receivers are deployed about each base station for receiving transmission from the portable units. The base station transmitters transmit signals on a signalling channel and on at least one communications channel. The portable receivers have means for scanning the base station transmitter signalling frequencies and for tuning to the signalling frequency associated with the strongest signalling signal received from the base transmitter. When communication is initiated, the portable transmitter and receiver are automatically retuned to one of the communications channels as determined by the strongest received signalling frequency and by channel availability. Means are also provided to continuously locate a portable unit and switch the operating frequency thereof as the portable unit moves between base station transmitter coverage areas. Further means are provided to reduce the output power of each portable transmitter to the minimum satisfactory level in order to reduce battery drain and interference.

    RADIO TELEPHONE SYSTEM
    7.
    发明专利
    RADIO TELEPHONE SYSTEM 未知

    公开(公告)号：CA1042989A

    公开(公告)日：1978-11-21

    申请号：CA288271

    申请日：1977-10-06

    Applicant: MOTOROLA INC

    Inventor： COOPER MARTIN ,  DRONSUTH RICHARD W ,  LEITICH ALBERT J ,  LYNK CHARLES N JR ,  MIKULSKI JAMES J ,  MITCHELL JOHN F ,  RICHARDSON ROY A ,  SANGSTER JOHN H

    IPC: H04B7/12

    Abstract: A portable duplex radio telephone system includes base station transmitters having a predetermined base transmission range, and a plurality of portable or mobile units each having a predetermined maximum transmission range shorter than the base transmission range. Satellite receivers are deployed about each base station for receiving transmissions from the portable units. The base station transmitters transmit signals on a signalling channel and on at least one communications channel. The portable receivers have means for scanning the base station transmitter signalling frequencies and for tuning to the signalling frequency associated with the strongest signalling signal received from the base transmitter. When communication is initiated, the portable transmitter and receiver are automatically retuned to one of the communications channels as determined by the strongest received signalling frequency and by channel availability. Means are also pro vided to continuously locate a portable unit and switch the operating frequency thereof as the portable unit moves between base station transmitter coverage areas. Further means are provided to reduce the output power of each portable transmitter to the minimum satisfactory level in order to reduce battery drain and interference.

    DIGITAL PRIVACY SYSTEM
    8.
    发明专利
    DIGITAL PRIVACY SYSTEM 未知

    公开(公告)号：CA940599A

    公开(公告)日：1974-01-22

    申请号：CA88836

    申请日：1970-07-22

    Applicant: MOTOROLA INC

    Inventor： BRAUN WILLIAM V ,  LEITICH ALBERT J

    IPC: H04K1/00 ,  H04L9/22

    Abstract: A digital voice-privacy system uses a delta modulator to convert voice information to digital data which then is encoded by combining the output of the delta modulator with a digital signal derived from selected stages or a shift register and a programmable code memory with the resultant data train being fed back as the input signal train for the shift register. The output of the last stage of the shift register is the encoded data. The data is decoded by a similar system, with the received signals being supplied to the input of a shift register and programmable code memory circuit comparable to the one used in the encoder to form a decoding signal which is combined with the encoded digital data to provide an output to a delta demodulator, the output of which then is the desired decoded voice information.

    TELEPHONE SYSTEM
    10.
    发明专利
    TELEPHONE SYSTEM 未知

    公开(公告)号：AU7440174A

    公开(公告)日：1976-04-29

    申请号：AU7440174

    申请日：1974-10-16

    Applicant: MOTOROLA INC

    Inventor： LEITICH ALBERT J ,  MIKULSKI JAMES J ,  LYNK CHARLES N ,  DRONSUTH RICHARD ,  MITCHELL JOHN F ,  SANGSTER JOHN H ,  RICHARDSON ROY A ,  COOPER MARTIN

    IPC: H04B1/50 ,  H04W84/04 ,  H04Q7/04

    Abstract: A portable duplex radio telephone system includes at least one base station transmitter having a predetermined base transmission range, and a plurality of portable or mobile units each having a predetermined portable maximum transmission range predeterminately shorter than the base transmission range. Satellite receivers are deployed about the base station within the base station transmission range for receiving transmissions from the portable units. The base station transmitter transmits signals on a signalling channel and on at least one communications channel. Each transmitter signalling and communications channel has a frequency that is paired or associated with a receiving frequency of the satellite receivers. In a multiple base station system, the portable receiver has means for scanning the base station transmitter signalling frequencies and for tuning the portable transmitter to the signalling frequency associated with the frequency of the strongest signalling signal received from the base transmitter. When communication is initiated, the portable transmitter and receiver are automatically retuned to one of the communications channels as determined by the strongest signalling frequency received by the portable receiver and by channel availability. Means are also provided in the system to continuously locate a portable unit and switch the operating frequency thereof as the portable unit moves between base station transmitter coverage areas. Further means are provided to automatically reduce the output power of each portable transmitter to the minimum level required for satisfactory communications in order to reduce battery drain and the interference caused by the portable transmitters.

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