INSTFREQPLOT Plot of instantaneous frequency
Usage: instfreqplot(f,op1,op2, ... );
instfreqplot(f,fs,op1,op2, ... );
INSTFREQPLOT(f) plots the instantaneous frequency of f using a DGT.
INSTFREQPLOT(f,fs) does the same for a signal with sampling rate
fs Hz.
The instantaneous frequency contains extreme spikes in regions
where the spectrogram is close to zero. These points are usually
uninteresting and destroy the visibility of the plot. Use the 'thr'
or 'clim' or 'climsym' options (see below) to remove these points.
An example:
instfreqplot(greasy,16000,'thr',.03,'climsym',100);
will produce a nice instantaneous frequency plot of the GREASY
signal.
INSTFREQPLOT accepts the following optional arguments:
'tfr',v Set the ratio of frequency resolution to time resolution.
A value v=1 is the default. Setting v>1 will give better
frequency resolution at the expense of a worse time
resolution. A value of 0<v<1 will do the opposite.
'wlen',s Window length. Specifies the length of the window
measured in samples. See help of PGAUSS on the exact
details of the window length.
'thr',r Keep the coefficients with a magnitude larger than r*
times the largest magnitude. Set the instantaneous
frequency of the rest of the coefficients to zero
'nf' Display negative frequencies, with the zero-frequency
centered in the middle. For real signals, this will just
mirror the upper half plane. This is standard for complex
signals.
'tc' Time centering. Move the beginning of the signal to the
middle of the plot. This is useful for visualizing the
window functions of the toolbox.
'image' Use imagesc to display the spectrogram. This is the
default.
'dgt' Use the 'dgt' method to compute the instantaneous
frequency. This is the default.
'clim',clim Use a colormap ranging from clim(1) to clim(2). These
values are passed to imagesc. See the help on imagesc.
'climsym',cval Use a colormap ranging from -cval to cval
'fmax',y Display y as the highest frequency.
Url: http://ltfat.github.io/doc/gabor/instfreqplot.html
See also: sgram, resgram, phaseplot.
Package: ltfat