Hi Shawn,
The problem I have described can't be verified with sygnal having only one frequency, as you setup in your example.
you should try sygnal wich is a sum of multiple singletones with different frequencies and amplitude:
public static int MultipleToneInformation(double[] signal, double samplingFrequency, double threshold, int maximumToneCount,
ToneSortingOrder tonesSortingOrder,
out double[] amplitudes, out double[] frequencies, out double[] phases )
{
NationalInstruments.Analysis.SpectralMeasurements.MultipleToneInformation mi = new NationalInstruments.Analysis.SpectralMeasurements.MultipleToneInformation
(signal, samplingFrequency,threshold, maximumToneCount,
tonesSortingOrder == TonesSortingOrder.DecreasingAmplitude?
NationalInstruments.Analysis.SpectralMeasurements.ToneSortingOrder.DecreasingAmplitude:
NationalInstruments.Analysis.SpectralMeasurements.ToneSortingOrder.IncreasingFrequency );
amplitudes = mi.GetAmplitudes();
frequencies = mi.GetFrequencies();
phases = mi.GetPhases();
return mi.DetectedToneCount;
}////////////////////////////////////////////////////////////
We have sygnal with 5 frequences, so our result arrays have 5 items
amplitudes.Length == 5
frequencies.Length == 5
phases.Length == 5
and we tried to to pass
tonesSortingOrder = ToneSortingOrder.IncreasingFrequency to our function, the values in the
the result arrays amplitudes, frequencies, phases
still are sorted according to the DecreasingAmplitude.
If you have a sygnal having only one frequency, your arrays will have only one item and sorting allways be the same!
You need a signal with multiple frequences, where each harmonics havre different amplitudes but order of the amplitudes not the same as frequences, i.e. something like this:
first tone amplitude A1 = 10, frequency F1 = 50;
second tone amplitude A2 = 20, frequency F1 = 100;
When ToneSortingOrder.DecreasingAmplitude is set, the result should be
amplitudes[0] = 20;
amplitudes[1] = 10;
frequencies[0] = 100;
frequencies[1] = 50;
When ToneSortingOrder.IncreasingFrequency is set, the result should be
amplitudes[0] = 10;
amplitudes[1] = 50;
frequencies[0] = 50;
frequencies[1] = 100;
but in the case like the last one I still see the data ToneSortingOrder.DecreasingAmplitude is set!
