发明名称 |
Method for producing a test signal with a predetermined signal-to-noise ratio on a freely selectable output frequency |
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 |
AU764543(B2) |
申请公布日期 |
2003.08.21 |
申请号 |
AU20000075143 |
申请日期 |
2000.09.04 |
申请人 |
ROHDE AND SCHWARZ GMBH AND CO. KG |
发明人 |
ERHARD KRETSCHMER;JOHANN MIESLINGER;GREGOR KLEINE |
分类号 |
H04L27/00;H04B17/00;H04L29/14;H04N17/00;(IPC1-7):H04B17/00 |
主分类号 |
H04L27/00 |
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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