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    Parallel tone detector
    2.
    发明授权
    Parallel tone detector 失效
    并行音调检测器

    公开(公告)号：US3686576A

    公开(公告)日：1972-08-22

    申请号：US3686576D

    申请日：1970-12-18

    申请人： IBM

    发明人： ABRAMSON PAUL ,  GOERTZEL GERALD

    IPC分类号： H04Q1/457

    CPC分类号： H04Q1/457

    摘要： A parallel tone detection method, system and apparatus includes using several generators for providing square waves at the fundamental frequency of several parallel tones to be detected. An unknown input signal is clipped and then AND gates are used to test for the simultaneous presence of the A.C. polarities of both the unknown input signal and each respective square wave. A lowpass filter is connected to each of the outputs of the AND gates associated with each tone. The outputs of the filters for each tone are connected into a corresponding analogue OR gate, which is one of a series of analogue OR gates. Then it is determined whether the outputs of any of the analogue OR gates exceeds a standard value. If it does then a circuit determines which analogue OR gate produces the largest output to identify the tone received.

    摘要翻译： 并行音检测方法，系统和装置包括使用几个发生器来提供要检测的几个并行音调的基频的方波。 未知输入信号被削波，然后与门用于测试未知输入信号和每个相应方波的同时存在A.C.极性。 低通滤波器连接到与每个音调相关联的与门的每个输出。 每个音调的滤波器的输出连接到相应的模拟或门，它是一系列模拟或门之一。 然后确定任何模拟或门的输出是否超过标准值。 如果这样做，则电路确定哪个模拟或门产生最大输出以识别所接收的音。

    Alphanumeric parallel tone, sequential character system, method, and apparatus
    4.
    发明授权
    Alphanumeric parallel tone, sequential character system, method, and apparatus 失效
    ALPHANUMER PARALLEL TONE，顺序字符系统，方法和装置

    公开(公告)号：US3582895A

    公开(公告)日：1971-06-01

    申请号：US3582895D

    申请日：1969-01-15

    申请人： IBM

    发明人： ABRAMSON PAUL ,  STILWELL GEORGE R JR

    IPC分类号： H04M11/06 ,  H04L27/26 ,  H04L27/30 ,  H04M11/00 ,  H04Q1/45 ,  H04Q9/00

    CPC分类号： H04L27/30

    摘要： An alphanumeric system, method, and apparatus includes a parallel tone transmitter, a parallel tone receiver, each having a conventional telephone frequency type of A and B or parallel tone oscillators, and a splitter of tones from the receiver. An A tone will last for an interval long enough to assure protection against response to spurious tones such as voice signals, but may change frequency during the character period. When the A tone is constant during a complete character period, the B tone will not last as long as the A tone, but will change frequency after a set interval, for an A-B-B sequential, alphanumeric code, during the character period for each character. Alternatively, both the A and B tones are changed to provide an A-A-B-B sequential code for each character. The audio tones employed are standard, avoid intermodulation error, and the system maintains voice protection, while increasing the number of alphanumeric characters for a period of fixed length.

    Frequency detector circuit utilizing an electromechanical tuned filter
    6.
    发明授权
    Frequency detector circuit utilizing an electromechanical tuned filter 失效
    采用机电调谐滤波器的频率检测电路

    公开(公告)号：US3588719A

    公开(公告)日：1971-06-28

    申请号：US3588719D

    申请日：1968-12-16

    申请人： IBM

    发明人： ABRAMSON PAUL ,  EMERSON LAWRENCE W

    IPC分类号： H03D3/16 ,  H04L27/14 ,  H04L27/148 ,  H03K9/00

    CPC分类号： H04L27/14 ,  H03D3/16 ,  H04L27/148

    摘要： A FREQUENCY DETECTION SYSTEM FOR DETECTING THE FREQUENCY OF TONE SIGNAL BURSTS IS PROVIDED WITH A CONTROLLED DAMPING ARRANGEMENT TO LIMIT THE RESONANT BUILDUP OF THE TUNED FREQUENCY DEVICE EMPLOYED THEREIN. DAMPING IS IMPLEMENTED THROUGH UTILIZATION OF A THREE TERMINAL SIGNAL CONTROLLED VARIABLE IMPEDANCE DEVICE, SUCH AS AN FET DEVICE, WHEREIN THE VARIABLE IMPEDANCE PATH IS COUPLED IN SERIES WITH THE INPUT TO

    THE SYSTEM AND THE CONTROL TERMINAL IS COUPLED TO THE OUTPUT OF THE SYSTEM.