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1.发明授权
公开(公告)号：US3775568A
公开(公告)日：1973-11-27
申请号：US3775568D
申请日：1971-11-04
发明人： HINO T , KOZU I , HASHIGUCHI S , AKAMINE T , NISHIMURA K , ORITA T , FUJISAWA K , NISHIYAMA A
IPC分类号： G11B5/00 , G11B19/00 , G11B27/00 , G11B27/022 , G11B27/10 , G11B27/13 , G11B31/00 , H04N5/781 , H04N5/91 , H04N7/12 , G11B5/86 , G11B19/28
CPC分类号： G11B5/00 , G11B19/00 , G11B27/005 , G11B27/022 , G11B27/10 , G11B27/13 , G11B31/00 , G11B2220/20 , G11B2220/455 , G11B2220/90 , H04N5/781 , H04N5/91 , H04N7/12
摘要： A signal recording and reproducing apparatus comprises a magnetic disc recorder and a magnetic tape recorder. Signals reproduced from a magnetic disc are recorded on a magnetic tape during low speed rotation of the magnetic disc and movement of the magnetic tape which is moved synchronously with the low speed rotation of the magnetic disc, whereby the influence of the irregularity of the rotation of the magnetic disc and the movement of the magnetic tape on the signals is eliminated. The apparatus can also be used as a signal transmission system by including a transmitting device and a receiving device. The transmitting device reproduces signals recorded on the magnetic disc and transmits the reproduced signals to the receiving device through a transmission line during the low speed rotation of the magnetic disc. The receiving device records the transmitted signals on a magnetic disc during the low speed rotation. The reproduced signals are transmitted as soon as the low speed rotation is started and the transmitted signals are recorded by detection of the beginning and the end of the transmitted signals.
摘要翻译： 信号记录和再现装置包括磁盘记录器和磁带记录器。 在磁盘的低速旋转和与磁盘的低速旋转同步移动的磁带的移动的同时，从磁盘再生的信号被记录在磁带上，由此影响旋转的不规则性 消除磁盘和磁带对信号的移动。 该装置还可以通过包括发送装置和接收装置用作信号传输系统。 发送装置再现记录在磁盘上的信号，并且在磁盘的低速旋转期间通过传输线将再现的信号发送到接收装置。 接收装置在低速旋转期间将发送的信号记录在磁盘上。 一旦低速旋转开始，再现的信号被传送，并且通过检测发送信号的开始和结束来记录发送的信号。
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公开(公告)号：US3738021A
公开(公告)日：1973-06-12
申请号：US3738021D
申请日：1970-10-15
发明人： NISHIYAMA A , NISHIMURA K , KOZU I , FUJISAWA K , HINO T , ORITA T
CPC分类号： G09B5/062
摘要： A system for synchronizing sounds with learning materials has a sound reproducing device, learning materials, stopping means and detecting means. The sound reproducing device is stopped by means of the stopping means and is started again by the stopping means which is released from the stopped position in response to output signals of the detecting means generated by detecting a change to the next part of the learning materials.
摘要翻译： 用于使声音与学习材料同步的系统具有声音再现装置，学习材料，停止装置和检测装置。 声音再现装置通过停止装置停止，并且响应于通过检测下一部分学习材料的改变而产生的检测装置的输出信号，由停止装置再次启动声音再现装置。
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公开(公告)号：US3835405A
公开(公告)日：1974-09-10
申请号：US37933873
申请日：1973-07-16
发明人： NISHIMURA K , FUJISAWA K , YOSUMI T
CPC分类号： H03D3/04
摘要： An FM demodulation system has a limiter, a frequency doubler, a sawtooth-wave generator, a low-pass filter, an amplitude selector and a noise suppressing circuit. The output voltage of the sawtooth-wave generator is proportional to the frequency deviation of the FM signal and becomes large when a noise occurs. During the occurrence of noise, the amplitude selector which is coupled to the output of the sawtooth-wave generator generates a signal for controlling the characteristics of the signal path in the noise suppressing circuit, so that a noise component does not appear at the signal output terminal.
摘要翻译： FM解调系统具有限幅器，倍频器，锯齿波发生器，低通滤波器，振幅选择器和噪声抑制电路。 锯齿波发生器的输出电压与FM信号的频偏成比例，当发生噪声时变大。 在噪声发生期间，耦合到锯齿波发生器的输出的幅度选择器产生用于控制噪声抑制电路中的信号路径的特性的信号，使得在信号输出处不出现噪声分量 终奌站。
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公开(公告)号：US3843928A
公开(公告)日：1974-10-22
申请号：US38133473
申请日：1973-07-20
发明人： NISHIMURA K , FUJISAWA K
摘要： An FM demodulation system having means for noise reduction. The system has a signal path which includes a limiter, an FM demodulation circuit and a gate circuit, and a control circuit which includes a differentiator, two mono-stable-multivibrators, an adder and a gate signal generator. The input of this control circuit is coupled to the output of the limiter and the output of the control circuit is coupled to the control terminal of the gate circuit so as to apply a gate signal to the gate circuit. The gate circuit in the signal path operates in such a way that a demodulated signal is passed to the output terminal of the system when the gate signal is not present and the demodulated signal is prevented from passing to the output terminal when the gate signal is present. The control circuit generates the gate signal when a dropout in the FM signal occurs in the following manner. The signal from the limiter is differentiated by the differentiator and is formed into a narrow pulse train having positive and negative polarities. The positive spikes and the negative spikes of this pulse train trigger the respective ones of two mono-stable-multivibrators, and the outputs from these multivibrators are added by the adder. The output pulse-width of these multivibrator is controlled so that a marker signal appears at the output of the adder when carrier dropout in the FM signal occurs. The gate signal generator generates the gate signal from the marker signal and the resulting gate signal is fed to the control terminal of the gate circuit. a result, a noise component does not appear at the output terminal.
摘要翻译： 一种具有降噪装置的FM解调系统。 该系统具有包括限幅器，FM解调电路和门电路的信号路径，以及包括微分器，两个单稳态多谐振荡器，加法器和门信号发生器的控制电路。 该控制电路的输入耦合到限幅器的输出端，控制电路的输出端耦合到门电路的控制端，以将门信号施加到门电路。 信号路径中的门电路以当门信号不存在时解调信号被传递到系统的输出端并且当存在门信号时防止解调信号通过到输出端的方式 。 当FM信号的压差以下列方式发生时，控制电路产生门信号。 来自限制器的信号由微分器区分，并形成具有正和负极性的窄脉冲串。 该脉冲串的正尖峰和负尖峰触发两个单稳态多谐振荡器中的相应的，并且来自这些多谐振荡器的输出由加法器相加。 控制这些多谐振荡器的输出脉冲宽度，使得当FM信号中出现载波丢失时，标记信号出现在加法器的输出端。 门信号发生器从标记信号产生门信号，并将得到的门信号送到门电路的控制端。 结果，噪声分量不会出现在输出端。
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