ST_CM_SlidingDFT_InitPars

Function block-specific structure with initialization parameters, which are analyzed when the function block is initialized.

TYPE ST_CM_SlidingDFT_InitPars EXTENDS ST_CM_Object_InitPars :
STRUCT
    nWindowLength  : UDINT := 1000;     (* Length of analysis window. *)
    nBins          : UDINT := 1;        (* Number of spectral bins. *)
    fDampingFactor : LREAL := 0.995;    (* Damping factor for SDFT. *)
    nChannels      : UDINT := 1;        (* Number of channels. *)
END_STRUCT
END_TYPE

• nWindowLength is the length of the analysis window in samples. The length must be greater than one and an even number.
• nBins is the number of spectral values to be calculated. The corresponding indices (k := f / fSampleRate / nWindowLength) must be configured after initialization using the Configure() method.
• fDampingFactor defines the value of the damping parameter of the recursion formula.
• nChannels defines the number of independent channels. This must be greater than zero.