.Modelica_Requirements.ChecksInFixedWindow_withFFT.Internal.fftScaled

Information

Compute scaled FFT

Interface

function fftScaled
  import Modelica.Utilities.Streams.print;
  input Real u_buf[:] "Signal for which FFT shall be computed; (size(u_buf,1) MUST be EVEN and should be an integer multiple of 2,3,5, that is size(u_buf,1) = 2^a*3^b*5^c, with a,b,c Integer >= 0)";
  input Integer nf(min = 1) "Number of frequency points that shall be returned in amplitudes and phases (typically: nf = max(1,min(integer(ceil(f_max/f_resolution))+1,nf_max))); the maximal possible value is nf_Max=div(size(u_buf,1),2)+1)";
  input Integer iTick "Number of sample points that have been stored in u_buf";
  input Modelica.SIunits.Time Ts "Sample period of FFT";
  input Boolean pre_periods_ok "Previous value of periods_ok";
  input String instanceName = "???";
  output Real A_buf[nf];
  output Boolean periods_ok;
end fftScaled;

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