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55 条记录 (耗时 0.018 秒)

    Selective call communication system
    2.
    发明授权
    Selective call communication system 失效
    选择性通话系统

    公开(公告)号：US4084138A

    公开(公告)日：1978-04-11

    申请号：US587333

    申请日：1975-06-13

    申请人： Keith H. Wycoff

    发明人： Keith H. Wycoff

    IPC分类号： H04W88/18 ,  H03B19/00

    CPC分类号： H04W88/188

    摘要： The encoder in such system generates a sequence of tones in which every other tone is selected from a first group of tones in one band of frequencies, and the remaining tones in the sequence are selected from a second group of tones in another band of frequencies. The tones in the second group are respectively harmonically related to the tones in the first group, such as having frequencies double the respective frequencies of the tones in such second group. The tones are generated by an oscillator in the encoder, every other tone being multiplied by 1/2, for example. Circuitry, coupled to the oscillator and to the multiplier, alternately delivers the divided and undivided tones, to create the afore-mentioned sequence of tones.The oscillator has associated therewith a switchable impedance, predetermined amounts of which are sequentially switched into the oscillator to cause it to produce the sequence of tones. To minimize energy loss, circuitry is provided to insure that the phase of the tones is substantially continuous as the different amounts of impedance are switched into the oscillator.A programming device enables internal fixing of the frequencies of certain tones, which tones represent the identification of the encoder. A manual selector enables external selection of the frequencies of other tones which represent other information relative to the encoder.

    摘要翻译： 这种系统中的编码器产生一个音调序列，其中从一个频带中的第一组音调中选出每个其他音调，并且从另一个频带中的第二组音调中选出该序列中的剩余音调。 第二组中的音调分别与第一组中的音调谐音相关，例如在这样的第二组中具有频率相应频率的两倍的频率。 音调由编码器中的振荡器产生，例如每隔一个音调乘以1/2。 耦合到振荡器和乘法器的电路交替地传送分开和不分割的音调，以产生上述音调序列。

    Method of transmitting information by radio
    3.
    发明授权
    Method of transmitting information by radio 失效
    通过无线电发送信息的方法

    公开(公告)号：US3984775A

    公开(公告)日：1976-10-05

    申请号：US540142

    申请日：1975-01-10

    申请人： Leon Cariel ,  Moise Levy ,  Hubert Zouizerate ,  Roger Touati

    发明人： Leon Cariel ,  Moise Levy ,  Hubert Zouizerate ,  Roger Touati

    IPC分类号： H04W88/18 ,  H04M11/02

    CPC分类号： H04W88/188

    摘要： The present invention describes a method and apparatus for selectively transmitting information by radio, without causing congestion of transmission frequency bands, even if the number of users who may be called is relatively great. This object is achieved by ensuring the identification of the users by a decoding matrix provided in each of the receiver devices assigned to each of the users; the pulses characterising a call code are introduced into a shift register and compared with the decoding matrix; when the corresponding binary words are identical, the call signal of the receiver is sent whether it is a sound and/or like call, also the shift register is used to record the details corresponding to the information to be transmitted and then to present said information in alphanumerical form.

    摘要翻译： 本发明描述了一种用于通过无线电选择性地发送信息而不引起传输频带拥塞的方法和装置，即使可能被呼叫的用户数量相对较大。 该目的通过确保通过分配给每个用户的每个接收机设备中提供的解码矩阵来确定用户的识别; 表征呼叫码的脉冲被引入移位寄存器并与解码矩阵进行比较; 当对应的二进制字是相同的时候，发送接收机的呼叫信号是否是声音和/或类似的呼叫，移位寄存器也用于记录与要发送的信息相对应的细节，然后呈现所述信息 以字母数字形式。

    Communication system incorporating signal delay
    4.
    发明授权
    Communication system incorporating signal delay 失效
    通信系统并发信号延迟

    公开(公告)号：US3866124A

    公开(公告)日：1975-02-11

    申请号：US37225073

    申请日：1973-06-21

    申请人： WYCOFF KEITH H

    发明人： WYCOFF KEITH H

    IPC分类号： H04W88/18 ,  H04B5/04

    CPC分类号： H04W88/188

    摘要： The system includes a transmitter which transmits a sequence of tones. The receiver in the system has a processing circuit to detect the tones. The sequence of tones itself and also a delayed sequence of tones are applied to a mixer, which provides a mixed signal with a frequency representative of the difference between tones in the sequence.

    摘要翻译： 该系统包括发送一系列音调的发射机。 系统中的接收机具有检测音调的处理电路。 音调序列本身以及延迟的音调序列被应用于混频器，该混频器提供具有表示序列中的音调之间的差异的频率的混合信号。

    High capacity paging system employing subaudible tones
    5.
    发明授权
    High capacity paging system employing subaudible tones 失效
    高容量打包系统采用可追踪的托音

    公开(公告)号：US3798545A

    公开(公告)日：1974-03-19

    申请号：US3798545D

    申请日：1972-02-07

    申请人： MOTOROLA INC

    发明人： SCHULTZ N ,  SCHWENDEMAN R

    IPC分类号： H04B1/40 ,  H04W88/18 ,  H04B5/04

    CPC分类号： H04W88/188

    摘要： A high capacity paging system includes a transmitter for transmitting a modulated signal in response to a message including address signals followed by audio signals. Each transmission is initiated by actuating the switch and terminated by deactuating the switch. Control circuitry is operative in response to the switch actuation to actuate the transmitter. The control circuitry includes time delay circuitry for holding the control circuitry operative for a first predetermined time period after deactuation of the switch. Address circuitry develops the address signals and is operative in response to actuation of the switch to couple the address signals to the transmitter for a second predetermined time period no greater than the first predetermined time period. Audio delay circuitry is operative in response to operation of the control circuitry to delay audio signals coupled from a microphone by the first predetermined time period and couple the delayed audio signals to the transmitter for transmission thereby. The address signals of the succeeding message are transmitted simultaneously with the terminal portion of the audio signals in the preceding message.

    摘要翻译： 高容量寻呼系统包括用于响应于包括跟随音频信号的地址信号的消息来发送调制信号的发射机。 每个传输通过启动开关启动，并通过停用开关来终止。 响应于开关致动以控制发射器，控制电路是可操作的。 控制电路包括时间延迟电路，用于在开关停用之后保持控制电路在第一预定时间段内操作。 地址电路产生地址信号，并且响应于开关的致动而工作，以将地址信号耦合到发射机在不大于第一预定时间段的第二预定时间段内。 音频延迟电路响应于控制电路的操作而工作，以将从麦克风耦合的音频信号延迟第一预定时间段，并且将延迟的音频信号耦合到发射机以便传输。 后续消息的地址信号与先前消息中的音频信号的终端部分同时发送。

    Sequential tone selective calling communication system and components thereof
    6.
    发明授权
    Sequential tone selective calling communication system and components thereof 失效
    顺序选择性呼叫通信系统及其组件

    公开(公告)号：US3613004A

    公开(公告)日：1971-10-12

    申请号：US3613004D

    申请日：1964-03-09

    申请人： WYCOFF KEITH H

    发明人： WYCOFF KEITH H

    IPC分类号： H04W88/18 ,  H04Q7/02 ,  H04B5/04

    CPC分类号： H04W88/188

    摘要： 1. In a communication system for selectively transmitting carrier signals carrying a control tone and a call-indicator tone and intelligence from a transmitter to at least one selected receiver, the combination comprising a transmitter including a tone-generating circuit for generating a preselected control tone, means for generating a call-indicator tone, a modulating circuit for modulating the carrier signals in accordance with the control tone and the control-indicator tone and the intelligence to be transmitted, a transmitter output circuit coupled to said modulating circuit for transmitting the carrier signals including the control tone and the call-indicator tone and the intelligence to be transmitted, a receiver including an input circuit for receiving the signals from said transmitter, a detecting circuit coupled to said input circuit for detecting the control tone and the call-indicator tone and the intelligence in the signals, an audio circuit for converting the intelligence into sound waves, a coupling circuit coupling said detecting circuit to said audio circuit for coupling the intelligence and the control tone thereto, a squelch circuit coupled to said coupling circuit and operative in a first condition thereof to render said coupling circuit inoperative and operative in a second condition thereof to render said coupling circuit operative, a first control circuit coupled to said squelch circuit and responsive to the application of the carrier signals to said receiver for generating a first control signal, a second tone control circuit coupled to said squelch circuit and responsive to the application of the control tone to said receiver for generating a second control signal, and squelch circuit being responsive to the application thereto of said first and second control signals for actuating said squelch circuit from the first condition thereof into the second condition thereof to render said coupling circuit operative to pass the call-indicator tone therethrough, means for maintaining said squelch circuit in the second condition thereof until the removal of said first control signal therefrom, a third tone control circuit coupled to said coupling circuit and responsive to the application thereto of the call-indicator tone from said coupling circuit for producing an output from said third tone control circuit, and a call-indicator annunciator coupled to said third control circuit and actuated by the output therefrom, whereby said receiver is operative to operate said call-indicator annunciator upon the application thereto of both the control tone and the call-indicator tone from said transmitter, the removal of said first control signal from said squelch circuit changing said squelch circuit from the second condition thereof to the first condition thereof to render said coupling circuit inoperative. 16. A communication system comprising: TRANSMITTER FOR TRANSMITTING A SIGNAL INCLUDING A RADIO FREQUENCY CARRIER, MODULATING MEANS FOR MODULATING SAID CARRIER, CONTROL MEANS FOR INITIATING THE OPERATION OF SAID MODULATION MEANS FOR FIRST CAUSING SAID MODULATION MEANS TO MODULATE SAID CARRIER WITH A FIRST FREQUENCY SIGNAL FOR A TIME PERIOD OF PREDETERMINED LIMITED DURATION AND FOR IMMEDIATELY THEREAFTER CAUSING SAID MODULATION MEANS TO MODULATE SAID CARRIER WITH A DIFFERENT FREQUENCY SIGNAL TO THEREBY CAUSE SAID TRANSMITTER MEANS TO FIRST TRANSMIT SAID CARRIER MODULATED BY A BURST OF SAID FIRST FREQUENCY SIGNAL AND THEN TRANSMIT SAID CARRIER MODULATED BY A SECOND FREQUENCY SIGNAL, A RECEIVER INCLUDING MEANS FOR RECEIVING AND DEMODULATING THE SIGNAL TRANSMITTED FROM SAID TRANSMITTER TO PROVIDE AN OUTPUT INCLUDING SAID BURST OF SAID FIRST FREQUENCY SIGNAL FOLLOWED BY SAID SECOND FREQUENCY SIGNAL, A NORMALLY OPERATIVE FIRST DECODING CIRCUIT MEANS AND A NORMALLY INOPERATIVE SECOND DECODING CIRCUIT MEANS EACH CONNECTED TO BE SUPPLIED WITH SAID OUTPUT AND A UTILIZATION CIRCUIT MEANS CONTROLLED BY SAID SECOND DECODING CIRCUIT MEANS, SAID FIRST DECODING CIRCUIT MEANS HAVING MEANS RESPONSIVE TO SAID BURST OF SAID FIRST FREQUENCY SIGNAL IN THE OUTPUT FROM SAID RECEIVER FOR RENDERING SAID SECOND DECODING CIRCUIT OPERATIVE FOR A TIME PERIOD OF PREDETERMINED LIMITED DURATION OVERLAPPING THE TIME DURING WHICH SAID OUTPUT INCLUDES SAID SECOND FREQUENCY SIGNAL, SAID SECOND DECODING CIRCUIT MEANS HAVING MEANS RESPONSIVE TO SAID SECOND FREQUENCY SIGNAL IN THE OUTPUT OF SAID RECEIVER FOR CAUSING ENERGIZATION OF SAID UTILIZATION CIRCUIT MEANS.

    Interleaved dual bank encoder
    10.
    发明授权
    Interleaved dual bank encoder 失效
    交叉双组编码器

    公开(公告)号：US4644345A

    公开(公告)日：1987-02-17

    申请号：US518417

    申请日：1983-07-29

    申请人： Keith H. Wycoff

    发明人： Keith H. Wycoff

    IPC分类号： H04Q1/457 ,  H04W88/18 ,  H04Q9/12

    CPC分类号： H04W88/188 ,  H04Q1/4575

    摘要： There is disclosed an encoder comprising means for generating a plurality of tones with every other tone being in a first bank and the remaining tones being in a second bank. The tones are sequentially combined into a code in which every other tone is from the first bank and the rest of the code tones are from the second bank.

    摘要翻译： 公开了一种编码器，包括用于产生多个音调的装置，其中每隔一个音调位于第一组中，而剩余音调位于第二组中。 音调被顺序地组合成其中每隔一个音调来自第一组的代码，而其余的代码音调来自第二组。