Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Reexamination Certificate
2006-05-02
2006-05-02
Feild, Joseph (Department: 2681)
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
C455S114200, C455S501000, C455S570000, C455S222000, C455S278100, C455S283000, C455S296000, C307S089000
Reexamination Certificate
active
07039360
ABSTRACT:
An external noise intrusion prevention device preventing intrusion of external noise into a central conductor of a trunk cable in an up signal frequency band is provided. A first filter circuit3letting a signal in frequencies of 54 MHz or higher pass is provided between an input terminal1and an output terminal2. A front filter circuit4aand a rear filter circuit4b, which constitute a second filter circuit4, are provided on both ends of the external noise intrusion prevention device, respectively. A noise elimination circuit6formed by cascading two connection transformers6aand6bis also provided. The two connection transformers6aand6bare connected to each other while being arranged in a line symmetrical manner.
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Burr & Brown
Feild Joseph
Maspro Denkoh Co., Ltd.
Nguyen Huy D.
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