Fourier Transforms

CUPLOT has a set of Fourier Transform commands. The transform is stored in temporary arrays. You can store the inverse transform into a frame/curve slot, after applying optional notch or band pass filters. You can also store the phase and/or amplitude into a slot. Only the data with the x window is transformed.

FF

takes the fourier transform of the data. The result is stored in a temporary array and can only be viewed using the FP command.   

FP

plots the frequency and magnitude.  

 
	Command[ ]? SH 45436

	Command[ ]? DE DYF-6810-1 ;

	Command[ ]? R			!read the data

	Command[ ]? FF			!transform the data

	Frame[F1C1]? F1

	Command[ ]? FP			!plot the transform

FR

windows the transform plot on the frequency range.  

FY

windows the transform plot on the amplitude range.

FN

notches a frequency range of the transform.

FB

sets a frequency range bandpass.

FU

stores the inverse transform back as a data element. This clears the transform array.  

 
	Command[ ]? FF F1			!transform F1

	Command[ ]? FN 395 405			!notch out freq 395 to 405

	Command[ ]? FU

	Frame to store inverse transform[F1C1]? F2

FO

sets or clears the flag to remove the linear (DC) offset when storing the inverse with the FC command.

FS

stores the phase or amplitude as a data element.  

 
	Command[ ]? FF F1			!transform F1

	Command[ ]? FS

	Store Phase or Amplitude[A]? A

	Frame/curve[F1C1]? F2

FC

correlates two frames, f * g.  

FV

convolves for response function, f / g.  

F2

plots the amplitute and phase of g.

FH

gives a list of the Fourier transform commands.