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1. 发明授权

US4101841A Gain control circuit 失效
标题翻译：增益控制电路
公开(公告)号：US4101841A
公开(公告)日：1978-07-18
申请号：US829244
申请日：1977-08-30
申请人： Shigeru Okada , Takao Arai , Kouichi Tomatsuri , Hiroshi Toeda
发明人： Shigeru Okada , Takao Arai , Kouichi Tomatsuri , Hiroshi Toeda
IPC分类号： H03G1/04 , H03G3/30 , H03G7/00
CPC分类号： H03G7/001 , H03G1/04 , H03G3/3005
摘要： Disclosed is a gain control circuit which comprises a gain control section including as its essential component a differential amplifier with which diodes or transistors arranged to act as diodes are connected as a load, and a control signal section including a logarithmic compression circuit and an exponential expansion circuit and providing a control signal for control of the gain of the gain control section. A temperature compensation circuit having a temperature dependence cancelling both the temperature dependence of the gain control section and that of the control signal section is provided in the bias circuit for the transistor in the last stage of the control signal section, so that the desired temperature compensation for the entire gain control circuit can be achieved at a single point.

2. 发明授权

US4422108A Tape recorder 失效
标题翻译：磁带录音机
公开(公告)号：US4422108A
公开(公告)日：1983-12-20
申请号：US383958
申请日：1982-06-01
申请人： Tohru Sampei , Naoya Fujita , Shigemitsu Higuchi , Masamichi Yamada , Kouichi Tomatsuri
发明人： Tohru Sampei , Naoya Fujita , Shigemitsu Higuchi , Masamichi Yamada , Kouichi Tomatsuri
IPC分类号： G11B5/035 , G11B15/02 , H03G5/00 , H03G5/16 , H03G5/18 , G11B5/45 , G11B5/47
CPC分类号： H03G5/00 , G11B15/02 , G11B5/035 , H03G5/165 , H03G5/18
摘要： A tape recorder comprises, in its signal recording path, a variable gain circuit compensating the sound recording sensitivity of a magnetic tape and two variable equalizers compensating the frequency characteristic of the magnetic tape in the intermediate and high frequency ranges respectively. Reference signals at three different frequencies are successively supplied to the signal recording path to be recorded on the magnetic tape, and the signals of different reference frequencies are successively reproduced from the magnetic tape to be then arithmetically processed so as to optimize the gain of the variable gain circuit and the degree of frequency characteristic compensation by the first and second variable equalizers.
摘要翻译：磁带录像机在其信号记录路径中包括补偿磁带的录音灵敏度的可变增益电路和分别补偿中频和高频范围内磁带的频率特性的两个可变均衡器。将三个不同频率的参考信号连续地提供给要记录在磁带上的信号记录路径，并且从磁带连续再现不同参考频率的信号，然后进行算术处理，以便优化变量的增益增益电路和第一和第二可变均衡器的频率特性补偿程度。

3. 发明授权

US3979721A Pulse code modulation recording and reproducing apparatus 失效
标题翻译：脉冲码调制记录和再现装置
公开(公告)号：US3979721A
公开(公告)日：1976-09-07
申请号：US560882
申请日：1975-03-21
申请人： Masuo Umemoto , Kouichi Tomatsuri , Yasunori Kanazawa
发明人： Masuo Umemoto , Kouichi Tomatsuri , Yasunori Kanazawa
IPC分类号： G11B20/18 , H04B14/04 , H04N5/926 , H04N5/945 , G11B27/36 , H03K5/18
CPC分类号： G11B20/1809 , H04N5/926 , H04N5/945
摘要： A PCM recording and reproducing apparatus comprising an error detecting circuit for detecting a frame including at least one word information signal with an error, the frame being a reproduction signal read from a recording medium on which certain pulse coded information is recorded in a frame distribution system, and a compensating circuit for compensating the reproduced information signal by the use of the output signal from the error detecting circuit, thereby removing the adverse effects of information dropout in spite of a high density recording.
摘要翻译：一种PCM记录和再现装置，包括用于检测包括具有错误的至少一个字信息信号的帧的错误检测电路，该帧是从其中将某些脉冲编码信息记录在帧分配系统中的记录介质读取的再现信号以及补偿电路，用于通过使用来自误差检测电路的输出信号补偿再生信息信号，从而消除信息丢失的不利影响，尽管存在高密度记录。

4. 发明授权

US4134078A Gain control circuit 失效
标题翻译：增益控制电路
公开(公告)号：US4134078A
公开(公告)日：1979-01-09
申请号：US823198
申请日：1977-08-09
申请人： Takao Arai , Shigeru Okada , Kouichi Tomatsuri , Hiroshi Toeda
发明人： Takao Arai , Shigeru Okada , Kouichi Tomatsuri , Hiroshi Toeda
IPC分类号： H03G3/10 , H03G1/00 , H03G3/30
CPC分类号： H03G1/0052
摘要： A gain control circuit comprising a pair of transistors constituting a differential amplifier, and a pair of resistors each connected to the emitter of one of the transistors and having a sufficiently great resistance value compared with 1/gm of the transistor in the transistor operating range, the resistors being connected to a common regulated current supply to supply the halves of control current from the regulated current supply to the respective transistors, a pair of diodes are connected to the collectors of the respective transistors as a load, and a first variable resistor means is disposed in the current path traced from the diodes to the regulated current supply via the transistors and resistors for compensating fluctuation of the diffused resistance of the diodes. Further, a second variable resistor means is disposed in the base bias circuit for the transistors for compensating fluctuation of the base-emitter voltage of the transistors.
摘要翻译：一种增益控制电路，包括构成差分放大器的一对晶体管和一对电阻器，每个电阻器连接到晶体管之一的发射极，并且与晶体管工作范围内的晶体管的1 / gm相比具有足够大的电阻值，电阻器连接到公共调节电流源，以将控制电流的一半从调节电流源提供给相应的晶体管，一对二极管作为负载连接到相应晶体管的集电极，第一可变电阻器装置被布置在从二极管经由晶体管和电阻器调节的电流源的电流路径中，以补偿二极管扩散电阻的波动。此外，第二可变电阻器装置设置在用于晶体管的基极偏置电路中，用于补偿晶体管的基极 - 发射极电压的波动。

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