tfplot(coef,step,yr); tfplot(coef,step,yr,...);
tfplot(coef,step,yr) will plot a rectangular coefficient array on the TF-plane. The shift in samples between each column of coefficients is given by the variable step. The vector yr is a \(1 \times 2\) vector containing the lowest and highest normalized frequency.
C=tfplot(...) returns the processed image data used in the plotting. Inputting this data directly to imagesc or similar functions will create the plot. This is usefull for custom post-processing of the image data.
tfplot is not meant to be called directly. Instead, it is called by other plotting routines to give a uniform display format.
tfplot (and all functions that call it) takes the following arguments.
| 'dynrange',r | Limit the dynamical range to r by using a colormap in the interval [chigh-r,chigh], where chigh is the highest value in the plot. The default value of [] means to not limit the dynamical range. |
| 'db' | Apply \(20\cdot \log_{10}\) to the coefficients. This makes it possible to see very weak phenomena, but it might show too much noise. A logarithmic scale is more adapted to perception of sound. This is the default. |
| 'dbsq' | Apply \(10\cdot \log_{10}\) to the coefficients. Same as the 'db' option, but assume that the input is already squared. |
| 'lin' | Show the coefficients on a linear scale. This will display the raw input without any modifications. Only works for real-valued input. |
| 'linsq' | Show the square of the coefficients on a linear scale. |
| 'linabs' | Show the absolute value of the coefficients on a linear scale. |
| 'tc' | Time centering. Move the beginning of the signal to the middle of the plot. |
| 'clim',clim | Use a colormap ranging from \(clim(1)\) to \(clim(2)\). These values are passed to imagesc. See the help on imagesc. |
| 'image' | Use imagesc to display the plot. This is the default. |
| 'contour' | Do a contour plot. |
| 'surf' | Do a surf plot. |
| 'colorbar' | Display the colorbar. This is the default. |
| 'nocolorbar' | Do not display the colorbar. |
| 'display' | Display the figure. This is the default. |
| 'nodisplay' | Do not display figure. This is usefull if you only want to obtain the output for further processing. |
If both 'clim' and 'dynrange' are specified, then 'clim' takes precedence.
It is possible to customize the text by setting the following values:
'time= t The word denoting time. Default is 'Time''
| 'frequency',f | The word denoting frequency. Default is 'Frequency' |
| 'samples',s | The word denoting samples. Default is 'samples' |
| 'normalized',n | Defult value is 'normalized'. |