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    DATA MUTING METHOD AND APPARATUS FOR COMMUNICATION SYSTEMS
    1.
    发明申请
    DATA MUTING METHOD AND APPARATUS FOR COMMUNICATION SYSTEMS 审中-公开
    数据监控方法和通信系统的设备

    公开(公告)号：WO1992010045A1

    公开(公告)日：1992-06-11

    申请号：PCT/US1991008568

    申请日：1991-11-15

    Applicant: MOTOROLA, INC.

    Inventor： MOTOROLA, INC. ,  LAIRD, Kevin, M. ,  CANNON, Gregory, L.

    IPC: H04L25/00

    CPC classification number: H03G3/342

    Abstract: Briefly, according to the invention, a receiver (700) having an audio output device (720) is disclosed. The receiver receives a carrier signal modulated with an information signal. A demodulator (722) included in the receiver (700) demodulates the received carrier signal and routes the demodulated information signal (302) to a delay circuit (310). The output of the demodulator (722) is also coupled to a decoder (318) where a data portion (404) of the demodulated information signal (302) is decoded to determine the exact start time of a voice portion (406) of the demodulated information signal (302). A coupler means couples the signal (302) to the audio output device (720) substantially simultaneously with the start of the voice portion (406) with no delay. As a result the received voice portion (406) is available on the audio output device (720) without the delay required to determine the nature of the signal (302). In other aspects of this invention a detector means (318) detects the presence of a voice portion of the information signal with no preceding data. In response to this detection the coupler (312) couples the output of the delay circuit (310) to the audio output device (720).

    Abstract translation: 简而言之，根据本发明，公开了一种具有音频输出装置（720）的接收机（700）。 接收机接收用信息信号调制的载波信号。 包括在接收机（700）中的解调器（722）解调所接收的载波信号，并将解调的信息信号（302）路由到延迟电路（310）。 解调器（722）的输出还耦合到解码器（318），其中解调的信息信号（302）的数据部分（404）被解码，以确定解调的信号的语音部分（406）的确切开始时间 信息信号（302）。 耦合器装置基本上与语音部分（406）的开始同时地将信号（302）耦合到音频输出装置（720）而没有延迟。 结果，接收的语音部分（406）在音频输出设备（720）上可用，而没有确定信号的性质所需的延迟（302）。 在本发明的其它方面中，检测器装置（318）在没有先前的数据的情况下检测信息信号的语音部分的存在。 响应于该检测，耦合器（312）将延迟电路（310）的输出耦合到音频输出设备（720）。

    APPARATUS AND METHOD FOR ADAPTING A DIGITAL RADIOTELEPHONE SYSTEM TO INCREASED SUBSCRIBER TRAFFIC
    2.
    发明申请
    APPARATUS AND METHOD FOR ADAPTING A DIGITAL RADIOTELEPHONE SYSTEM TO INCREASED SUBSCRIBER TRAFFIC 审中-公开
    适用于数字无线电话系统的装置和方法，以增加订户流量

    公开(公告)号：WO1995012257A1

    公开(公告)日：1995-05-04

    申请号：PCT/US1994010997

    申请日：1994-09-29

    Applicant: MOTOROLA INC.

    Inventor： MOTOROLA INC. ,  BATTIN, John, W. ,  LYNK, Charles, N., Jr. ,  LAIRD, Kevin, M.

    IPC: H04B07/00

    CPC classification number: H04W88/181 ,  G10L19/00 ,  H04J3/1688

    Abstract: A digital radiotelephone system employs vocoders (401, 403) to convert between analog speech and a digital format suitable for transmission via radio. Under most circumstances, the highest data rate is selected for optimum audio quality. When the system occupancy exceeds a particular threshold, as detected at the fixed site of the system, some or all of the vocoders (401, 403) are instructed to switch to a lower data rate to provide for an increase in the number of communication channels. Further, a portable subscriber unit (103, 111, 113) may autonomously change its vocoder data rate depending upon the charge state of its battery.

    Abstract translation: 数字无线电话系统使用声码器（401,403）在模拟语音和适合经由无线电发送的数字格式之间进行转换。 在大多数情况下，选择最高数据速率以获得最佳音频质量。 当系统占用超过特定阈值时，如在系统的固定站点处检测到的，指示部分或全部声码器（401,403）切换到较低数据速率以提供通信信道数量 。 此外，便携式用户单元（103,111,113）可以根据其电池的充电状态自主地改变其声码器数据速率。

    DYNAMIC ENCRYPTION KEY SELECTION FOR ENCRYPTED RADIO TRANSMISSIONS
    3.
    发明申请
    DYNAMIC ENCRYPTION KEY SELECTION FOR ENCRYPTED RADIO TRANSMISSIONS 审中-公开
    加密无线电传输的动态加密关键选择

    公开(公告)号：WO1992017959A1

    公开(公告)日：1992-10-15

    申请号：PCT/US1992002627

    申请日：1992-03-27

    Applicant: MOTOROLA, INC.

    Inventor： MOTOROLA, INC. ,  BARRETT, Steven, T. ,  LAIRD, Kevin, M. ,  MURRAY, Richard, E. ,  O'CONNOR, James, M.

    IPC: H04L09/02

    CPC classification number: H04L9/0894 ,  H04L9/16 ,  H04L2209/80

    Abstract: A radio (100) transmits and receives encrypted signals having unencrypted key identifiers, allowing other radios having the corresponding key identifiers and encryption keys to communicate with radio (100). Prior to transmitting an encrypted message, radio (100) selects a unique key identifier automatically and uses the corresponding encryption key to encrypt the message that will be transmitted. Radio (100) transmits the key identifier in an unencrypted format with the encrypted message in order to allow other radios to determine the encryption key used in encrypting the message. When receiving an encrypted message, radio (100) uses the predetermined process stored in the radio (100) to properly select the proper encryption key for use in decrypting the incoming message.

    METHOD AND APPARATUS TO SUSPEND SPEECH
    4.
    发明申请
    METHOD AND APPARATUS TO SUSPEND SPEECH 审中-公开
    停播语音的方法和设备

    公开(公告)号：WO1991014309A1

    公开(公告)日：1991-09-19

    申请号：PCT/US1991000873

    申请日：1991-02-12

    Applicant: MOTOROLA, INC.

    Inventor： MOTOROLA, INC. ,  SCHORMAN, Eric, R. ,  LAIRD, Kevin, M.

    IPC: H03G03/20

    CPC classification number: H03G3/32

    Abstract: A communication device (10) comprises an input for receiving a first audio signal (12) and an input (36) for receiving a second audio signal. The communication device (10) also includes a circular buffer (34) for storing the output digital audio signal (12) and for producing an output audio signal (20). The communication device (10) determines whether at least a portion of the output audio signal (20) is present in the second audio signal. If such a portion is present, the communication device (10) subtracts the portion of the output audio signal (20) from the second audio signal, to produce a third audio signal (26). A threshold detector, responsive to the third audio signal, produces a first control signal, when the level of the third audio signal increases to at least a first predetermined level, and a second control signal, when the level of the third audio signal decreases to a value lower than a second predetermined level, where the second predetermined level is lower than the first predetermined level. Finally, a buffer control (22) causes the buffer (34) to suspend production of the output audio signal in response to the first control signal, and causes the buffer (34) to resume production of the audio signal (12), in response to the second control signal.

    DYNAMIC ENCRYPTION KEY SELECTION FOR ENCRYPTED RADIO TRANSMISSIONS
    9.
    发明公开
    DYNAMIC ENCRYPTION KEY SELECTION FOR ENCRYPTED RADIO TRANSMISSIONS 失效
    动态加密密钥选择加密的无线电传输。

    公开(公告)号：EP0596894A1

    公开(公告)日：1994-05-18

    申请号：EP92911983.0

    申请日：1992-03-27

    Applicant: MOTOROLA, INC.

    Inventor： BARRETT, Steven, T. ,  LAIRD, Kevin, M. ,  MURRAY, Richard, E. ,  O'CONNOR, James, M.

    IPC: H04Q7 ,  H04K1 ,  H04L9

    CPC classification number: H04L9/0894 ,  H04L9/16 ,  H04L2209/80

    Abstract: Radio (100) émettant et recevant des signaux cryptés comprenant des identificateurs de clef non cryptés qui permettent à d'autres radios possédant les identificateurs de clef et les clefs de cryptage correspondants, de communiquer avec ladite radio (100). Avant d'émettre un message crypté, la radio (100) sélectionne automatiquement un identificateur unique de clef et utilise la clef de cryptage correspondante pour crypter le message qui sera ensuite émis. La radio (100) émet l'identificateur de clef dans un format non crypté avec le message crypté afin que les autres radios puissent repérer la clef de cryptage utilisée pour crypter le message. Lorsque la radio (100) reçoit un message crypté, elle utilise le traitememt prédéterminé qu'elle garde en mémoire, pour déterminer avec exactitude le code de cryptage approprié grâce auquel le message qui vient d'arriver pourra être décrypté.

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