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1. 发明授权

US4724337A Automatic gain control detection circuit 失效
标题翻译：自动增益控制检测电路
公开(公告)号：US4724337A
公开(公告)日：1988-02-09
申请号：US844608
申请日：1986-03-27
申请人： Jyoji Maeda , Kazuo Hasegawa , Yasunori Miyahara
发明人： Jyoji Maeda , Kazuo Hasegawa , Yasunori Miyahara
IPC分类号： H03G3/30 , H03G1/04 , H03G3/20 , H03K5/00 , H03F3/45
CPC分类号： H03G3/3005 , H03G1/04
摘要： An automatic gain control (AGC) detection circuit. The AGC detection circuit includes; a current source, first to fourth transistors whose emitters are connected in common to the current source, a reference voltage source for supplying the bases of the first and the second transistors with a reference voltage, input terminal means connected to the bases of the third and the fourth transistors for receiving an input signal, a power supply source for supplying the first to fourth transistors with a power supply voltage, first collector load means connected between the power supply source and a node connecting the collectors of the first and second transistors in common, second collector load means connected between the power supply source and another node connecting the collectors of the third and fourth transistors in common, and an output terminal means connected between the nodes for taking out an automatic gain control detection output.
摘要翻译：自动增益控制（AGC）检测电路。 AGC检测电路包括：电流源，其发射极共同连接到电流源的第一至第四晶体管，用于向第一和第二晶体管的基极提供参考电压的参考电压源，连接到第三和第三晶体管的基极的输入端子装置，用于接收输入信号的第四晶体管，用于向第一至第四晶体管提供电源电压的电源;第一集电极负载装置，连接在电源和连接第一和第二晶体管的集电极之间的节点连接在电源和共同连接第三和第四晶体管的集电极的另一节点之间的第二集电极负载装置，以及连接在节点之间用于取出自动增益控制检测输出的输出端装置。

2. 发明授权

US4901351A Video signal scramble system 失效
标题翻译：视频信号加扰系统
公开(公告)号：US4901351A
公开(公告)日：1990-02-13
申请号：US241314
申请日：1988-09-07
申请人： Masatoshi Tanaka , Wataru Kuroiwa , Akinori Masuko , Jyoji Maeda , Shouji Uehara , Tsutomu Uekusa
发明人： Masatoshi Tanaka , Wataru Kuroiwa , Akinori Masuko , Jyoji Maeda , Shouji Uehara , Tsutomu Uekusa
IPC分类号： H04N7/171
CPC分类号： H04N7/1713
摘要： A transmitter encoder has a gain selector for compressing the level of a horizontal sync signal component of a video intermediate frequency (IF) signal to scramble it, and an AM modulation degree controller for superposing a control signal, which indicates the timing for the level compression, on an FM audio IF signal in the form of AM modulation. The transmitter encoder further has an oscillator circuit for generating a sine wave with a horizontal frequency (fH) and an nfH sine wave having a frequency n times the horizontal frequency, and a mixer for mixing these sine waves to thereby provide the above control signal. A receiver decoder has an AM detector for detecting an AM component of the FM audio IF signal from the transmitter encoder to reproduce a composite signal and band filters for respectively extracting the fH and nfH sine waves from the reproduced composite signal. The receiver decoder further has a gain selector for expanding the compressed level of the horizontal sync signal component of the video IF signal from the transmitter encoder, by means of a sync expansion pulse generated on the basis of the fH sine wave.
摘要翻译：发射机编码器具有用于压缩视频中频（IF）信号的水平同步信号分量的电平以对其进行加扰的增益选择器，以及用于叠加控制信号的AM调制度控制器，其指示电平压缩的定时，以AM调制形式的FM音频IF信号。发射机编码器还具有振荡器电路，用于产生具有水平频率（fH）和频率n倍于水平频率的nfH正弦波的正弦波和用于混合这些正弦波的混频器，从而提供上述控制信号。接收机解码器具有AM检测器，用于检测来自发射机编码器的FM音频IF信号的AM分量，以再现复合信号，以及频带滤波器，用于分别从再现的复合信号中提取fH和nfH正弦波。接收机解码器还具有增益选择器，用于借助于基于fH正弦波产生的同步扩展脉冲来扩展来自发射机编码器的视频IF信号的水平同步信号分量的压缩电平。

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