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    Step-by-step pulse transmitter
    1.
    发明授权
    Step-by-step pulse transmitter 失效
    逐步式脉冲发生器

    公开(公告)号：US3689708A

    公开(公告)日：1972-09-05

    申请号：US3689708D

    申请日：1970-03-03

    Applicant: STANDARD TELEPHONES CABLES LTD

    Inventor： NABAVI CHRISTOPHER DARIUS

    IPC: H03K3/78 ,  H04M1/27 ,  H04M1/30

    CPC classification number: H03K3/78 ,  H04M1/271

    Abstract: An adaptor unit for a voice operated typewriter employing morse code to provide a voice operated hands free telephone dialling facility. The unit consists of a four-bit counter interconnected with a multi-vibrator so that the counter is incremented by each pulse generated by the multi-vibrator and so that the multivibrator is held off when the count is zero. When a number is written into the counter from the voice operated typewriter employing morse code, the multi-vibrator is enabled to generate the requisite number of pulses needed to restore the count to zero.

    Abstract translation: 用于使用莫尔斯码的语音操作打字机的适配器单元来提供语音操作的免提电话拨号设施。 该单元由与多个振动器互连的四位计数器组成，使得计数器由多个振动器产生的每个脉冲递增，并且当计数为零时多个振动器被关闭。 当从使用莫尔斯码的语音操作的打字机将数字写入计数器时，多振动器能够产生将计数恢复为零所需的脉冲数。

    Adding frequency-modulated electrical signals
    2.
    发明授权
    Adding frequency-modulated electrical signals 失效
    增加频率调制电气信号

    公开(公告)号：US3651410A

    公开(公告)日：1972-03-21

    申请号：US3651410D

    申请日：1969-10-08

    Applicant: MARCONI CO LTD ,  STANDARD TELEPHONES CABLES LTD

    Inventor： DAVIES ROBIN EVAN

    IPC: H03C1/52 ,  H04N7/01 ,  H04B1/26

    CPC classification number: H03C1/52 ,  H04N7/01

    Abstract: Apparatus for generating an output signal the frequency of which is equal to the sum of the frequencies of two frequency-modulated input signals without demodulating the input signals is used in averaging two frequency-modulated signals and consists of a balanced mixer, and a band-pass filter and an amplitude limiter connected in series to the output of the mixer. The mixer consists of two transformers, two full-wave rectifiers and a differential amplifier connected to generate from two input signals A and B a signal A+B - A-B .

    Abstract translation: 用于产生其频率等于两个频率调制输入信号的频率之和而不解调输入信号的输出信号的装置用于平均两个频率调制信号，并由平衡混频器和带通滤波器组成， 通过滤波器和与混频器的输出串联连接的限幅器。 混频器包括两个变压器，两个全波整流器和一个差分放大器，连接成从两个输入信号A和B产生一个信号| A + B | -A-B |。

    Apparatus for analyzing a complex waveform containing pitch synchronous information
    3.
    发明授权
    Apparatus for analyzing a complex waveform containing pitch synchronous information 失效
    用于分析复合波形的装置，包含同步信息

    公开(公告)号：US3546584A

    公开(公告)日：1970-12-08

    申请号：US68490267

    申请日：1967-11-14

    Applicant: STANDARD TELEPHONES CABLES LTD

    Inventor： ALISTER ROBERT WALTER

    IPC: G01L3/16 ,  G10L25/00 ,  G10L25/90 ,  G01R23/16 ,  G10L1/04

    CPC classification number: G10L25/90 ,  G01L3/16 ,  G10L25/00

    Abstract: 1,139,711. Speech recognition. STANDARD TELEPHONES & CABLES Ltd. 30 Nov., 1966, No. 53636/66. Heading G4R. In apparatus for analysing a complex waveform, the waveform is fed via a band-pass filter to a zero-crossing detector and a peak amplitude detector, the time elapsed between two successive zero crossings bearing a specific relationship to the detection of a peak amplitude being obtained. In Fig. 2, a speech waveform is band-pass filtered at 7 before passing to a peak amplitude detector 8 and zero-crossing detector 9. The first peak, detected at 8, switches on a counter 11 so that it counts zero-crossings, detected at 9. The first zero-crossing also starts an integrator 14, 15 which is read out via AND gate 16 to a sample and hold circuit 17 on a count (at 11) of two. Thus circuit 17 stores a voltage proportional to the time elapsed between the first and second zero-crossings following the first peak. Circuit 17 may feed an oscilloscope and is reset at the start of the next voicing cycle, or when threshold circuit 18 indicates an absence of signal. In Fig. 4, four circuits 20, 21, 22, 23 each as above, the filters having the pass-bands shown, are used to recognize the presence of the first and second formants. If the outputs of circuits 20 21, 22, 23 exceed respective thresholds, the ratio of the thresholds being fixed but the actual magnitudes depending on a master threshold circuit 24 responsive to the speech input, "threshold yes" outputs are energized. Units 25,27,29,31,32 and AND gates (some inhibitory) and units 26, 28 are OR gates. Coincidence unit 30 produces an output if its inputs are unequal. Fig. 4 is otherwise self-explanatory.

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