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公开(公告)号：US5230019A
公开(公告)日：1993-07-20
申请号：US683177
申请日：1991-04-09
申请人： Toyokazu Yanagimichi , Harumasa Kajita , Tetsuo Kariya , Toshikazu Wakabayashi , Ichiro Kawashima , Satoshi Nakanami , Masami Tanaka
发明人： Toyokazu Yanagimichi , Harumasa Kajita , Tetsuo Kariya , Toshikazu Wakabayashi , Ichiro Kawashima , Satoshi Nakanami , Masami Tanaka
CPC分类号： H04N7/1675
摘要： A key signal conversion device for use in a CATV television system in which more than one different scrambling process is performed, the conversion device receiving one of a scrambled high-frequency signal in a television system and a sound intermediate frequency signal in the television system, extracting a key signal for unscrambling the scrambling in the television system and adding the key signal to a nonscrambled television signal which is to be subsequently scrambled by a process other than a process used to scramble the received signal, the key signal conversion device including: a first detecting circuit, for receiving the one of a scrambled television signal and a sound intermediate frequency signal, and for detecting one of a synchronizing signal of the television signal and a synchronizing signal superimposed on the sound intermediate frequency signal; a gate circuit, for receiving the one of a scrambled television signal and a sound intermediate-frequency signal, and for extracting the key signal therefrom using the synchronizing signal detected by the first detecting circuit; a second detecting circuit, for receiving the nonscrambled television signal, and for detecting a synchronizing signal thereof; and an inserting circuit for superimposing the key signal on the nonscrambled television signal in a predetermined horizontal interval in the vertical blanking interval of the nonscrambled television signal by the gate circuit using the signal detected by the second detecting circuit.
摘要翻译： 一种在CATV电视系统中使用的关键信号转换装置，其中执行多于一个不同的加扰处理，所述转换装置接收电视系统中的加扰高频信号和电视系统中的声音中频信号之一， 提取用于对电视系统中的加扰进行解扰的密钥信号，并将该密钥信号加到未被加密的非扰码电视信号中，该电视信号随后被除了用于加扰接收信号的处理之外的处理加扰，该密钥信号转换装置包括： 第一检测电路，用于接收加扰电视信号和声音中频信号之一，并且用于检测电视信号的同步信号和叠加在声音中频信号上的同步信号之一; 门电路，用于接收扰频电视信号和声音中频信号中的一个，并且使用由第一检测电路检测的同步信号从中提取密钥信号; 第二检测电路，用于接收非加扰电视信号，并用于检测其同步信号; 以及插入电路，用于使用由第二检测电路检测的信号由门电路在非加扰电视信号的垂直消隐间隔中以预定的水平间隔将键信号叠加在非加扰电视信号上。
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公开(公告)号：US5161187A
公开(公告)日：1992-11-03
申请号：US665949
申请日：1991-03-07
申请人： Harumasa Kajita , Toyokazu Yanagimichi , Tetsuo Kariya , Toshikazu Wakabayashi , Ichiro Kawashima , Satoshi Nakanami , Masami Tanaka
发明人： Harumasa Kajita , Toyokazu Yanagimichi , Tetsuo Kariya , Toshikazu Wakabayashi , Ichiro Kawashima , Satoshi Nakanami , Masami Tanaka
CPC分类号： H04N7/1675
摘要： A cable television system includes a transmitter and at least one receiver. In the transmitter, sync information is suppressed in amplitude to execute scrambling, and a sync width information signal and key data are superimposed on a television signal during a vertical blanking period. The sync width information signal has a burst form and a predetermined width, and represents whether sync information is present or absent. The key data represents contents of the scrambling. In the receiver, the sync width information signal is recovered, and a sync width information pulse corresponding to the sync width information signal is generated. A reference signal is generated on the basis of an edge of the sync width information pulse. The key data is extracted from the scrambled video information in response to the reference signal. Pseudo sync signals are generated in response to an edge of the sync width information pulse. The sync information of the scrambled video information is increased in amplitude in response to the extracted key data at timings determined by the pseudo sync signals.
摘要翻译： 有线电视系统包括发射机和至少一个接收机。 在发送机中，以振幅抑制同步信息来执行加扰，并且在垂直消隐期间，将同步宽度信息信号和密钥数据叠加在电视信号上。 同步宽度信息信号具有突发形式和预定宽度，并且表示是否存在同步信息。 密钥数据表示加扰的内容。 在接收机中，恢复同步宽度信息信号，产生与同步宽度信息信号对应的同步宽度信息脉冲。 基于同步宽度信息脉冲的边沿产生参考信号。 响应于参考信号从加扰的视频信息中提取密钥数据。 响应于同步宽度信息脉冲的边沿产生伪同步信号。 响应于由伪同步信号确定的定时，提取的密钥数据，加扰视频信息的同步信息的幅度增加。
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公开(公告)号：US5272751A
公开(公告)日：1993-12-21
申请号：US32164
申请日：1993-03-12
CPC分类号： H04N7/1713
摘要： In a pay television device, a horizontal sync signal, a vertical sync signal, and the like are removed from a composite video signal, and first-frequency and second-frequency signals for descrambling processing are attached in the intervals corresponding to the removed signals, thus eliminating the need for multiplexing signals which are necessary for descrambling processing on an audio signal.
摘要翻译： 在付费电视装置中，从复合视频信号中去除水平同步信号，垂直同步信号等，并且以对应于去除信号的间隔附加用于解扰处理的第一频率和第二频率信号， 从而消除了对对音频信号进行解扰处理所必需的多路复用信号的需要。
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公开(公告)号：US4015228A
公开(公告)日：1977-03-29
申请号：US584211
申请日：1975-06-05
申请人： Kazuo Eda , Masanobu Tanaka , Harumasa Kajita , Mikio Ishida , Michio Matsuoka
发明人： Kazuo Eda , Masanobu Tanaka , Harumasa Kajita , Mikio Ishida , Michio Matsuoka
摘要： This invention provides a surge absorber for absorbing surges of electric current. The absorber has a metal oxide varistor hermetically sealed in a hollow insulator by a top and a lower electrical terminal and also has a conductive rod extending substantially downwardly and electrically connected to ground and to the lower electrical terminal by solder and also thermally connected to the metal oxide varistor whereby when the varistor is heated by a surge of an electric current therethrough to a temperature to heat the solder above the melting point of the solder, said conductive rod gets separated from the lower electrical terminal to fall downwardly, thereby stopping the electric current through the metal oxide varistor to ground. The lower electrical terminal is preferably so constructed that a hole is produced therein upon the separation of the conductive rod from the lower electrical terminal for equalizing the atmospheric pressure in the hollow and the pressure of the outside atmosphere, thereby preventing the absorber from exploding.
摘要翻译： 本发明提供一种用于吸收电流浪涌的浪涌吸收器。 吸收体具有通过顶部和下部电气端子密封在中空绝缘体中的金属氧化物变阻器，并且还具有基本上向下延伸并且电连接到地面的导电棒，并且通过焊料延伸到下部电气端子并且还热连接到金属 氧化物变阻器，由此当通过电流浪涌将压敏电阻加热到焊料高于焊料熔点的温度时，所述导电棒从下电端子分离以向下落下，从而停止电流 通过金属氧化物变阻器接地。 下部电气端子优选地构造成在导电棒与下部电气端子分离时产生孔，用于均衡空腔中的大气压力和外部气氛的压力，从而防止吸收体爆炸。
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公开(公告)号：US4418424A
公开(公告)日：1983-11-29
申请号：US244327
申请日：1981-03-16
申请人： Noriyuki Kawamoto , Toru Higashi , Harumasa Kajita
发明人： Noriyuki Kawamoto , Toru Higashi , Harumasa Kajita
CPC分类号： H04B3/04
摘要： A control system for a cable television transmission line which has functions of collecting and controlling data. Information is collected by generating an instruction and transmitting same to a microcomputer by space communication. Furthermore, the operating conditions of a remote cable television line amplifier can be changed by generating an instruction from the microcomputer.
摘要翻译： 一种具有收集和控制数据功能的有线电视传输线控制系统。 通过产生指令并通过空间通信将其发送到微计算机来收集信息。 此外，可以通过生成来自微型计算机的指令来改变远程有线电视线路放大器的操作条件。
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