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1. 发明专利

JPS59172103A Non-linear emphasizer circuit 失效
标题翻译：非线性振荡器电路
公开(公告)号：JPS59172103A
公开(公告)日：1984-09-28
申请号：JP4594083
申请日：1983-03-22
申请人： Hitachi Denshi Ltd
发明人： NAKAMURA NATSUKI
IPC分类号： H04B1/62 , G11B20/04 , G11B20/10 , H04N5/922
CPC分类号： G11B20/10009
摘要： PURPOSE:To improve the accuracy of time base correction by making the trailing edge recording and reproducing without lowering the emphasis equantity to improve the S/N of the trailing edge of a synchronizing signal of reproducing signals and using the trailing edge as a reference signal of a time base corrector. CONSTITUTION:An input terminal 1 is connected to an output terminal 2 through a linear emphasizer circuit, namely, through a parallel circuit composed of a resistance 4 and condenser 5. Also, a non-linear emphasizer circuit, namely, a circuit composed of a condenser 6, diodes 7 and 8, and resistance 9, is connected to the output terminal 2 through an analog switch circuit 15. Usually, the switching circuit 15 is closed and, to improve the accuracy of time base correction, the switching circuit 15 is opened at the trailing edge of a synchronizing signal and the non-linear circuit is cut off, and thus, the emphasis quantity is improved. When this operation is made in the same manner to a de-emphasizer, the waveform can be restored and the S/N can be improved.
摘要翻译：目的：通过进行后沿记录和再现而不降低强调等级来提高再现信号的同步信号的后沿的S / N并且使用后沿作为参考信号的参考信号来提高时基校正的精度时基校正器。构成：输入端子1通过线性增强器电路，即通过由电阻4和电容器5组成的并联电路连接到输出端子2.另外，非线性强调电路，即由电容器6，二极管7和8以及电阻9通过模拟开关电路15连接到输出端2.通常，开关电路15闭合，为了提高时基校正的精度，开关电路15是在同步信号的后沿断开，非线性电路被切断，从而提高了强调量。当以与去除增强器相同的方式进行该操作时，可以恢复波形并且可以提高S / N。

2. 发明专利

JPS58197989A Automatic adjusting device of chromaticity signal level 失效
标题翻译：自动调节色度信号电平
公开(公告)号：JPS58197989A
公开(公告)日：1983-11-17
申请号：JP8022482
申请日：1982-05-14
申请人： Hitachi Denshi Ltd
发明人： NAKAMURA NATSUKI
IPC分类号： H04N9/793 , H04N9/87
CPC分类号： H04N9/87
摘要： PURPOSE:To execute an adequate chroma level adjustment, by generating a reproducing equalizer control signal from level information of a reproducing burst signal and level information of a reproducing signal, and making a chromaticity signal automatically conform with a reproducing picture signal level. CONSTITUTION:A reproducing RF signal 1 is sent to a demodulator 3 after its frequency characteristic is adjusted by a reproducing equalizer circuit 2, and is demodulated to a reproducing picture signal 4. This signal 4 is sent to a reproducing burst signal level detector 5 and a reproducing signal level detector 6, too. Subsequently, as for this signal, a burst signal in the reproducing signal is envelope-detected by the detector 5, its peak value is sampling-held, and a burst signal level information signal 7 is obtained and is sent to a differential amplifier 9. Also, as for the signal 4, a synchronizing signal in the reproducing signal is sampling-held by the detector 6, and a synchronizing signal level information signal 8 is obtained and is sent to the amplifier 9. Subsequently, a difference signal is fed back as an equalizer control signal 10 to the equalizer circuit 2 from the amplifier 9.
摘要翻译：目的：通过从再生脉冲信号的电平信息和再现信号的电平信息产生再现均衡器控制信号，并且使色度信号自动符合再现图像信号电平来执行适当的色度电平调整。构成：再现RF信号1在其再现均衡器电路2调整其频率特性之后被发送到解调器3，并被解调为再现图像信号4.该信号4被发送到再现突发信号电平检测器5，再现信号电平检测器6。随后，对于该信号，再现信号中的突发信号由检测器5包络检测，其峰值被采样保持，并且获得突发信号电平信息信号7，并将其发送到差分放大器9。此外，对于信号4，再现信号中的同步信号由检测器6采样保持，并且获得同步信号电平信息信号8并将其发送到放大器9.随后，反馈差信号作为来自放大器9的均衡器电路2的均衡器控制信号10。

3. 发明专利

JPS5730104A Head signal switching system 失效
标题翻译：头信号切换系统
公开(公告)号：JPS5730104A
公开(公告)日：1982-02-18
申请号：JP10369680
申请日：1980-07-30
申请人： Hitachi Denshi Ltd
发明人： NAKAMURA NATSUKI
IPC分类号： G11B27/36 , G11B15/14 , H04N5/91
CPC分类号： G11B15/14
摘要： PURPOSE:To improve the S/N ratio of a reproduced signal while managing with only one head amplifier by equipping switch elements in a rotary drum and by controlling it by an erasure signal. CONSTITUTION:During recording, an input signal is applied via a rotary transformer 6. An erasure signal is applied to an erasing head 5 through a rotary transformer 8 and also supplied to an erasure signal detecting circuit 17, and switch elements are placed at recording sides respectively by a signal from switch driving circuit 18. The said recorded signal is applied to a recording head 3. The output of a monitor head 4 is outputted by a rotary transformer 7 via the switch elements and a head amplifier 16 to monitor the recording operation. During reproduction, no erasure signal is applied and the switch elements are at reproduction sides, so that the output of the head 3 is outputted from the rotary transformer 7 via the switch element and head amplifier 16.
摘要翻译：目的：为了提高再生信号的信噪比，同时仅通过一个头放大器管理旋转鼓中的开关元件，并通过擦除信号进行控制。构成：在记录期间，通过旋转变压器6施加输入信号。擦除信号通过旋转变压器8施加到擦除头5，并且还提供给擦除信号检测电路17，并且开关元件被放置在记录侧分别通过来自开关驱动电路18的信号将所述记录信号施加到记录头3.监视器头4的输出由旋转变压器7经由开关元件和头放大器16输出以监视记录操作。在再现期间，不施加擦除信号并且开关元件在再现侧，从而头3的输出经由开关元件和头放大器16从旋转变压器7输出。

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