Code covered by the BSD License

Agilent Infiniium and InfiniiVision Oscilloscopes – MATLAB Example

Vinod Cherian (view profile)

17 Dec 2008 (Updated )

MATLAB application example for Agilent Infiniium and InfiniiVision oscilloscopes

pulseWave2(Data,Time)
```function varargout = pulseWave2(Data,Time)
% PULSEWAVE2 Create a pulse at zero crossings
%
%  Usage:
%  [X,Y]         = PULSEWAVE2(DATA,TIME);
%
%    MATLAB Code that is executed:
%
%    sig         = (Data>guardband) - (Data<-guardband);
%    idx         = find(sig);
%    w           = find(diff(sig(idx)));
%    idx1        = idx(w);
%    fData       = zeros(size(Data));
%    fData(idx1) = 1;
%
%  See also
%  INVERTWAVE, SQUAREWAVE, PULSEWAVE, ZEROCROSSING

% \$Author: Tatkins \$
% \$Revision: 3 \$
% \$Date: 5/06/05 1:41p \$

% Local Functions Defined:
%

% \$Notes:
%
% \$EndNotes

% \$Description:
%
% \$EndDescription

%   Copyright 1996-2012 The MathWorks, Inc.

if nargout ==3
varargout{1} = 'Time [sec]';
varargout{2} = 'Amplitude [V]';
varargout{3} = 'Pulses at Zero Crossings';
return;
end;

if nargin==0
help(mfilename)
return;
end;

Data = Data-mean(Data);

% I use a guardband in case of noise.
guardband = max(Data)*0.01;

sig = (Data>guardband) - (Data<-guardband);

% Find the index of all the points outside of the guardband
idx  = find(sig);

% Generate indexes of when we transition from one state to the other.
%   Remember a derivative (diff) is zero for constant values and a number if there is a change.
w = find(diff(sig(idx)));
idx1 = idx(w);              % Valid Point before Crossing state

% Generate the output signal with zeros except at just before crossing
fData = zeros(size(Data));
fData(idx1) = 1;

varargout{1} = Time;
varargout{2} = fData;
```

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