ST_CM_InstantaneousFrequency_InitPars

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

TYPE ST_CM_InstantaneousFrequency_InitPars EXTENDS ST_CM_Object_InitPars :
STRUCT
    nFFT_Length          : UDINT := 512;              (* Length of FFT. *)
    nWindowLength        : UDINT := 400;              (* Length of analysis window. *)
    fMagnitudeThreshold  : LREAL := cCM_MinArgDiv;    (* Minimum value for the numerical calculability. *)
    fSampleRate          : LREAL := 50000;            (* Sample rate in Hertz. *)
    nChannels            : UDINT := 1;                (* Number of channels. *)
END_STRUCT
END_TYPE

• nFFT_Length is the length of the FFT. It must be greater than one and an integral power of two.
• nWindowLength is the length of the analysis window in samples. The length must be greater than one and an even number.
• fMagnitudeThreshold defines the limit value for the numerical calculability of the instantaneous frequency. The limit value relates to the value
  
• fSampleRate Sampling rate of the incoming time signal. The value is used for the scaling of the result in Hz.
• nChannels defines the number of independent channels. This must be greater than zero.