EnvelopeSpectral('Expression','Frenquency1*','Frequency2*',' Cutoff frequency')

Arguments

'Expression'

Measured value

'Frequency1*'

Specification of the lower limit of the frequency band for the envelope calculation Value may not be less than 10% of the Nyquist frequency.

'Frequency2*'

Specification of the upper limit of the frequency band for the envelope calculation Value may not be greater than 90% of the Nyquist frequency.

'Cutoff frequency'

Optional specification of a limit frequency for the configuration of a low-pass filter which will be applied to the envelope.

Parameters ending with * are only evaluated once at the start of the acquisition.
Description

The function calculates the spectral envelope of 'Expression' with a constant band pass between the 'Frequency1' and 'Frequency2' frequencies. The smallest bandwidth is 10% of the Nyquist frequency, i.e., 10% of half the sampling frequency.

The 'Expression' signal is rescanned at the time base of the virtual signal. No anti-aliasing filter is applied.