Synchronous averaging to find signals in noise
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Filename: 202713.llb
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Experiment #1: Note how Asynchronous vector averaging not only gets rid of the noise, but also the signal, so this type of averaging has no value.
Experiment #2: Switch to Syncrhnous. Here, the instrument is synchronized to the sine generator, and averages the value at each point in time relative to the start of the signal. As the measurement proceeds, you will see a progressively cleaner sine wave emerging from the Averaged Waveform Graph. This type of averaging has many names: Synchronous averaging, time domain averaging, vector averaging.
Experiment #3: Repeat the synchronous averaging experiment with the Noise Level set to various levels. See how it is possible to find signals totally buried in noise (set to 20 dB)
Requirements
Filename: 202713.llb
Software Requirements
Application Software: LabVIEW Full Development System 6.0
Language(s): LabVIEW
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