Is there a way to set the color map and color limits of the dsp.SpectrumAnalyzer without using the spectrum properties GUI?

I have a piece of script that calls the dsp.SpectrumAnalyzer and uses it as a spectrogram. I would like to be able to hard code the color map and color limits into the script so that I don't have to go through the GUI in the spectrogram window to change these parameters each time it starts. Is there a property that can be set ahead of time that does this?

Answer 1

[Aarti Ghatkesar]

Hi

This cannot be done as there are no command line API's available to set the color properties for Spectrum Analyzer in DSP System Toolbox.

Answer 2

[Kenny Barlee]

There is actually an easy way to do this (posting as a note for people who find this page):

1. make a spectrum analyzer object
2. display data in it
3. create figure handle to it
4. set the colormap and color limits using figure handle

% create object 
obj_spectrum = dsp.SpectrumAnalyzer(...)

% display data in it
step(obj_spectrum, data)          % ('data' needs to come from somewhere)

% get figure handle
hfig = gcf

% set parameters
hfig.CurrentAxes.CLim = [-20 30]  % for scale between -20dBm and 30dBm
hfig.Colormap = jet(256)          % use jet/ hot/ cool/ grey etc

[Mary Malast]

Excellent answer! Thank you.