Method for producing a test signal
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United States of America Patent
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Aug 24, 2004
Grant Date -
N/A
app pub date -
Feb 5, 2002
filing date -
Oct 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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.
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