发明名称 |
Fremgangsmate og anordning for a tilveiebringe et testsignal med et pa forhand bestemt signal/stoy forhold pa en fritt valgbar utgangsfrekvens |
摘要 |
An apparatus and method are described for producing a test signal with a desired signal-to-noise ratio on a selectable output frequency for measuring a transmission system. A carrier signal, generated from a carrier signal, and a noise signal are remixed with the carrier signal in a bandwidth equal to or smaller than a smallest signal bandwidth of the transmission system. The levels of the carrier signal and the noise signal are adjusted to a predetermined ratio based on a measurement of the remixed carrier signal and the remixed noise signal. The noise signal is attenuated and added to the carrier signal until the desired signal-to-noise ratio is attained. |
申请公布号 |
NO322531(B1) |
申请公布日期 |
2006.10.23 |
申请号 |
NO20010006249 |
申请日期 |
2001.12.19 |
申请人 |
ROHDE & SCHWARZ GMBH & CO KG |
发明人 |
KRETSCHMER ERHARD;MIESLINGER JOHANN;KLEINE GREGOR |
分类号 |
H04B17/00;H04L27/00;H04L29/14;H04N17/00 |
主分类号 |
H04B17/00 |
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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