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frequencyFilter.md

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Frequency Filter

A frequency filter can be calculated using the function

function filterFrequencies(f::MPIFile;
                           SNRThresh=-1,
                           minFreq=0, maxFreq=rxBandwidth(f),
                           recChannels=1:rxNumChannels(f),
                           sortBySNR=false,
                           numUsedFreqs=-1,
                           stepsize=1,
                           maxMixingOrder=-1,
                           sortByMixFactors=false)

Usually one will apply an SNR threshold SNRThresh > 1.5 and a minFreq that is larger than the excitation frequencies. The frequencies are specified in Hz. Also useful is the opportunity to select specific receive channels by specifying recChannels.

The return value of filterFrequencies is of type Vector{Int64} and can be directly passed to getMeasurements, getMeasurementsFD, and getSystemMatrix.