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Eldo Control Language<br />

Library of Functions for Tasks<br />

ifft<br />

Task function category: Functions Operating on Waveforms<br />

Calculates the inverse Fast Fourier Transform of the input waveform.<br />

Usage<br />

ifft(wf)<br />

ifft(wf, start_frequency)<br />

ifft(wf, start_frequency, stop_frequency)<br />

ifft(wf, start_frequency, stop_frequency, sampling_time)<br />

ifft(wf, start_frequency, stop_frequency, sampling_time,<br />

number_of_points)<br />

ifft(wf, start_frequency, stop_frequency, sampling_time,<br />

number_of_points, sampling)<br />

ifft(wf, start_frequency, stop_frequency, sampling_time,<br />

number_of_points, sampling, padding)<br />

ifft(wf, start_frequency, stop_frequency, sampling_time,<br />

number_of_points, sampling, padding, normalized)<br />

Arguments<br />

• wf<br />

Specifies the input waveform name.<br />

• start_frequency<br />

Specifies the start frequency of the signal.<br />

• stop_frequency<br />

Specifies the stop frequency of the signal.<br />

• sampling_time<br />

Specifies the sampling time of the signal.<br />

• number_of_points<br />

Specifies the number of sampling points.<br />

• sampling<br />

Specifies the method of computing the sampled data. Valid values are “No Sampling” or<br />

“Interpolation”.<br />

• padding<br />

Activates data padding to pad the input data with zeros, before or after the input data set.<br />

Valid values are: “No Padding”, “Padding Right”, “Padding Left”, and “Padding Left and<br />

Right”. The input parameter will be verified by the algorithm and changed if necessary.<br />

• normalized<br />

Specifies whether to normalize the data. Specify 0 to use the raw data from the calculation<br />

unmodified. Specify 1 to normalize the raw data.<br />

Eldo® User's Manual, 15.3 911

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