HAS-Motion Software Documentation

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compute power from dft coefficients]] computedftdialog.jpg ==== pipeline command ==== **metric_compute_dft_coefficients** /signal_types= ! /signal_names= ! /signal_folder=original ! /signal_components=all_components ! /result_suffix=_dft ! /result_folder=dft !/[[visual3d:documentation:c3d_signal_types:event_label_data_type#event_sequence|event_sequence]]= !/[[visual3d:documentation:c3d_signal_types:event_label_data_type#exclude_events|exclude_events]]= ! /start_frame= ! /end_frame= ! /use_point_rate=true ! /base_frequency= /num_frequencies=4 **;** ==== signal_components ==== each component of the signal will generate a metric signal containing the coefficients for that component of the signal. ==== number of frequencies ==== the parameter num_frequencies determines the number of coefficients that will be stored in the resulting metric signal. if num_frequencies is empty, the number is determined consistent with a standard dft or fft. num_frequencies = 1 + numframes/2 where the maximum number of frequencies = 0.5*datarate; ==== event_sequence ==== the [[visual3d:documentation:c3d_signal_types:event_label_data_type#event_sequence|event sequence and exclude_sequence]] define the range of frames used to compute the dft coefficients ==== base_frequency ==== if base_frequency is empty, frequency= samplingrate/numberofframes (average per cycle per file) else frequency= numerical value or expression ==== resulting metric signal ==== the metric signal is stored as follows (base_frequency, p0, p1, p2, p3, p4, ....) the base_frequency and coefficients are stored as components of the signal. if there are multiple ranges of data, there will be a "frame" or "row" for each range. see also : [[visual3d:documentation:pipeline:metric_commands:metric_compute_power_from_dft_coefficients|metric_compute_power_from_dft_coefficients]]