Automatic frequency scanning in a twoway radio communication system

    公开(公告)号:US3426279A

    公开(公告)日:1969-02-04

    申请号:US3426279D

    申请日:1966-09-20

    Applicant: CIT ALCATEL

    Inventor: BERMAN LEON

    CPC classification number: H04W48/16 Y02D70/00

    Abstract: 1,145,899. Combined radio receiving and transmitting systems; radio interconnection systems. CIT - COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 20 Sept., 1966 [21 Sept., 1965], No. 42034/66. Headings H4K and H4L. In a transmitter-receiver radio system using a modulated carrier frequency for two-way communication between any two stations of a group of stations for which there is provided a number of channels in a frequency band, each station comprises a transmitter and a receiver which are both connected to a common variable frequency oscillator which is operable by scanning means to scan across the frequency band. Said scanning means can be disabled by a first switching means, to which either a decoding means or a threshold detector can be connected by a second switching means. When the decoding means is connected to the first switching means scanning is stopped when an identification signal is received, and when the threshold detector is connected to the first switching means scanning is stopped when the absence of carrier signal indicates that a channel is vacant and available. As described, a radio station comprises an aerial 1 which is connected when used for reception through a contact a of a relay 2 to an H.F. amplifier 3, a mixer 4, and an I.F. amplifier and detector 5, the output from which is connected to a threshold detector 6, a decoder 9, and, via a contact p of a relay 13 and an L.F. amplifier 7, to the receiver 26 of a handset 25. The mixer 4 is fed at its other input from a variable-frequency oscillator 8 which is operated by an automatic frequency control circuit 11, providing either continuous or stepby-step variations of frequency, and connected through a contact k of the relay 13. If the system covers the 140-143 Mc/s. band, divided into 100 channels, the oscillator 8 would cover 170-173 Mc/s and the band-width of the amplifier 5 would be 30 Mc/s. On the " transmit " side, a microphone 27 is connected through a contact q of a relay 16 to a modulator 19, having a second input from a fixed frequency (for example, 2 Mc/s.) oscillator 18, whose output is connected to a mixer 21 having a second input from a fixed frequency (for example, 32 Mc/s.) oscillator 20. The output from the mixer 21 is connected through a contact e of the relay 13, to a second mixer 23 having a second input from the variable frequency oscillator 8. The output from the mixer 23, with the same carrier frequency as in the " receive " side, is connected through an amplifier 24 to a contact b of the relay 2. When the handset 25 is " on-hook " a contact t is open, thereby de-energizing a relay 14 and closing a contact c of a make-before-break pair c, d. Power is supplied from a unit 12, which is controlled by the decoder 9, through the contact c to the operating coils of relays 13, 16. The contact k of the relay 13 switches on the circuit 11, and the oscillator 8 begins to scan. The amplifier 7 is disconnected from the output of the amplifier-detector 5 and is earthed through a contact n. A variable encoder 17 is connected through a contact r of the relay 16, in place of the microphone 27. If a call is received, the decoder 9 operates the unit 12, and the relays 13, 16 are deenergized. Scanning stops when the contact k opens and the microphone 27 is connected via the contact q. A signalling lamp 10 lights up as a contact g is closed. To speak, a pressswitch s in the handset is operated which energizes the relay 2, so switching the aerial 1 from contact a on the receive side to contact b on the transmit side. To make a call, the called station's code is set up on the encoder 17. The handset 25 is lifted when the relay 14 is energized via a contact t. The relays 13, 16 remain operated by output from the threshold detector 6, as the contact d makes before the contact c breaks. Scanning continues until a free channel is encountered, when the relay 13 is de-energized as the output from the threshold detector 6 falls. The relay 16 remains energized for a further time by reason of a delay member 15 in circuit with it, and the calling code is transmitted by operating the press switch s.

    Device for transmitting and reproducing color pictures
    136.
    发明授权
    Device for transmitting and reproducing color pictures 失效
    用于发送和再现彩色图像的设备

    公开(公告)号:US3922714A

    公开(公告)日:1975-11-25

    申请号:US40765573

    申请日:1973-10-18

    Applicant: CIT ALCATEL

    CPC classification number: H04N1/504 H04N1/482

    Abstract: Device for the transmitting and reproducing of color pictures by the trichromatic method making use of a device which, for analyzing or reproducing a flat document line by line, uses a device for illuminating by a light point describing a circular path, connected with a suitable optical device and comprising synchronizing means for ensuring the required succession of the three colors, for example, blue, green, red, both on transmitting and on receiving.

    Abstract translation: 用于通过三色方法发送和再现彩色图像的装置,其使用用于逐行分析或再现平面文档的装置,其使用用于通过描述圆形路径的光点进行照明的装置,该光点与合适的光学 装置,并且包括同步装置,用于在发射和接收时确保所需的三种颜色,例如蓝色,绿色,红色的连续。

    Drive device for holding paper on a rotating drum
    137.
    发明授权
    Drive device for holding paper on a rotating drum 失效
    用于将纸张保持在旋转鼓上的驱动装置

    公开(公告)号:US3918707A

    公开(公告)日:1975-11-11

    申请号:US39733473

    申请日:1973-09-14

    Applicant: CIT ALCATEL

    CPC classification number: B65H29/06 B65H29/12 G03B27/585 G03B27/6257

    Abstract: A rotating drum has a gripper bar mounted for cooperation therewith to convey sheets. The gripper bar is manually moved from a stationary first position spaced from the rotating drum to a second position to grip the sheet against the drum and rotate therewith. After moving through a predetermined angle, the eccentric mounting of the gripper bar causes the bar to move away from the drum and assume the stationary first position.

    Abstract translation: 旋转滚筒具有安装用于与其协作以传送片材的夹持杆。 手柄杆从与旋转鼓隔开的固定的第一位置手动地移动到第二位置,以将片材夹紧在滚筒上并与之一起旋转。 在移动预定角度之后,夹持杆的偏心安装使杆移动离开滚筒并呈现静止的第一位置。

    A.C. voltage detector with delayed triggering signal generation
    138.
    发明授权
    A.C. voltage detector with delayed triggering signal generation 失效
    具有延迟触发信号产生的交流电压检测器

    公开(公告)号:US3916221A

    公开(公告)日:1975-10-28

    申请号:US42981674

    申请日:1974-01-02

    Applicant: CIT ALCATEL

    CPC classification number: H03K17/28 H04L1/20

    Abstract: Circuitry used in detecting a data signal on an electric transmission line includes a detector with a charge capacitor and a circuit comprising a diode, resistors and an auxiliary capacitor. Upon the appearance of a data signal at the input of the detector, the circuitry generates a delayed triggering signal at its output due to the parallel connection of the charge and auxiliary capacitors and the resulting large time constant of the circuitry. When the data signal ceases to appear, the diode becomes reverse biased by the charge having been stored on the auxiliary capacitor, and since the time constant of the circuitry is thereby made smaller, the provision of the triggering signal is rapidly ended.

    Abstract translation: 用于检测电力传输线上的数据信号的电路包括具有充电电容器的检测器和包括二极管,电阻器和辅助电容器的电路。 当在检测器的输入端出现数据信号时,由于电荷和辅助电容器的并联连接以及由此导致的电路的大的时间常数,电路在其输出端产生延迟的触发信号。 当数据信号不再出现时,二极管被已经存储在辅助电容器上的电荷反向偏置,并且由于电路的时间常数因此变小,所以触发信号的提供迅速地结束。

    Automatic device for surface treatment
    139.
    发明授权
    Automatic device for surface treatment 失效
    自动装置进行表面处理

    公开(公告)号:US3888270A

    公开(公告)日:1975-06-10

    申请号:US38484073

    申请日:1973-08-02

    Applicant: CIT ALCATEL

    Inventor: CRAPET JEAN

    CPC classification number: H05K13/0061 H05K3/0085 Y10S134/902

    Abstract: Automatic device for surface treatments having at least one mobile unit moving intermittently on a roll track parallel to the alinement of treatment stations and two fixed end stations situated at the ends of the said alinement, namely, a loading station enabling the supplying of the support frames with the objects to be treated and a shaker control station actuating two parallel shaker bars, the end stations being connected through the bars and each of the said mobile units transferring, from one treatment station to another and in turn, on the portion of chain assigned to it, the support frames loaded with the objects to be treated.

    Abstract translation: 用于表面处理的自动装置具有至少一个移动单元,其在平行于处理站的分配的滚动轨道上间歇移动,以及位于所述分配的端部处的两个固定端站,即能够提供支撑框架的装载站 与待处理的物体和摇动控制站致动两个平行的摇动杆,终端站通过杆连接,并且每个所述移动单元从一个处理站转移到另一处理站,并且依次转移到链分配的部分 对它,支撑框架装载要处理的对象。

    Time multiplex frame correlation device
    140.
    发明授权
    Time multiplex frame correlation device 失效
    时间复用帧相关设备

    公开(公告)号:US3883729A

    公开(公告)日:1975-05-13

    申请号:US44173874

    申请日:1974-02-12

    Applicant: CIT ALCATEL

    CPC classification number: H04J3/0608

    Abstract: Device for the automatic search for the characteristic elements of a time multiplexing binary frame comprising a logic circuit equipment which, on receiving such a frame whose parameters are unknown, searches automatically, on the basis of a correlation between the incident signal and the same signal delayed, the number of bits N and makes it possible to determine by simple and rapid manipulations which may be automatic, a synchronization word which exists in principle in any time multiplexing frame.

    Abstract translation: 用于自动搜索时间复用二进制帧的特征元素的装置,包括逻辑电路设备,该逻辑电路设备在接收到参数未知的帧时,根据入射信号和相同信号延迟后的相关性自动搜索 ,位数N,并且使得可以通过简单快速的操作来确定可以是自动的,原则上在任何时间复用帧中存在的同步字。

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