The Auditory Modeling Toolbox
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STMODSPECGRAM - Spectro-Temporal Modulation spectrogram
Usage
stmodspecgram(f,fs); stmodspecgram(f,fs,...);
stmodspecgram(f,fs) plots the modulation spectogram of the signal f sampled at a sampling frequency of fs Hz.
C=stmodspecgram(f,fs, ... ) returns the image to be displayed as a matrix. Use this in conjunction with imwrite etc.
The function takes the following additional arguments
| 'win',g | Use the window g. See the help on gabwin for some possiblities. Default is to use a Gaussian window controlled by the 'thr' or 'wlen' parameters listed below. |
| '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. |
| 'image' | Use imagesc to display the spectrogram. 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. |
| 'dynrange',r | Use a colormap in the interval [chigh-r,chigh], where chigh is the highest value in the plot. |
| 'fmax',fmax | Display fmax as the highest frequency. |
| 'mfmax',mfmax | Display mfmax as the highest modulation frequency. |
| 'smfmax',smfmax | Display smfmax as the highest spectral modulation frequency. |
| 'xres',xres | Approximate number of pixels along x-axis / time. |
| 'yres',yres | Approximate number of pixels along y-axis / frequency |
| 'contour' | Do a contour plot to display the spectrogram. |
| 'surf' | Do a surf plot to display the spectrogram. |
| 'mesh' | Do a mesh plot to display the spectrogram. |
| 'colorbar' | Display the colorbar. This is the default. |
| 'nocolorbar' | Do not display the colorbar. |
| 'interp' | Interpolate the image to get the desired x-resolution. Turn this off by using 'nointerp' |
The parameters 'dynrange', 'mfmax' and 'smfmax' may be speficied first on the argument line, in that order.
References:
T. Elliott and F. Theunissen. The modulation transfer function for speech intelligibility. PLoS Computational Biology, 5(3), 2009.
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