发明名称 |
Tuner for communications equipment |
摘要 |
An tuner unit is provided for communications receivers with automatic self-balancing of the individual high frequency filter circuits. An assigned frequency applied to the desired receiver channel is fed to the antenna input during the automatic balancing process. The voltage of this assigned frequency picked up at the output of the filter circuits changes according to a stepwise increase of a tuning voltage controlled by a microprocessor. The tuning voltage is applied to the filter circuit to be balanced via a digital-analog converter and via a switching means controlled by the microprocessor. The automatic balancing is provided by switching the switching means successively to connect to the individual filter sections.
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申请公布号 |
US4590611(A) |
申请公布日期 |
1986.05.20 |
申请号 |
US19840575522 |
申请日期 |
1984.01.31 |
申请人 |
DEUTSCHE THOMSON-BRANDT GMBH |
发明人 |
MAIER, GERHARD;LANGE, JOACHIM |
分类号 |
H03J7/00;H03J1/00;H03J3/32;H03J5/00;H03J7/02;(IPC1-7):H03J7/20;H04B1/18 |
主分类号 |
H03J7/00 |
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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