发明名称 |
SIGNAL LEVEL ADJUSTING DEVICE |
摘要 |
PURPOSE:To resolve the problems of separately adjusting outgoing signals and incoming signals in order to adjust the input/output signal level of a line amplifier used for the transmission line of a bidirectional CATV facility and stopping transmitted signals by executing the adjustment while attaching/ detaching a specified circuit network. CONSTITUTION:As variable functions, an adjuster 1 for low frequency and an adjuster 2 for high frequency are provided in a pseudo line circuit network 3, and a loss characteristic equal to the attenuating characteristic of a coaxial cable is arbitrarily continuously selected. Thus, the outgoing signals and incoming signals of the line amplifier in the bidirectional CATV facility can be adjusted without stopping those signals. |
申请公布号 |
JPH05145926(A) |
申请公布日期 |
1993.06.11 |
申请号 |
JP19910308808 |
申请日期 |
1991.11.25 |
申请人 |
MATSUSHITA ELECTRIC IND CO LTD |
发明人 |
HATAKEYAMA IKUO;KIDO SHINICHI |
分类号 |
H04B3/40;H04N7/10;H04N21/61;H04N21/647 |
主分类号 |
H04B3/40 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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