c=batmask;
batmask loads a Gabor multiplier with a 0/1 symbol that masks out the main contents of the 'bat' signal. The symbol fits a Gabor multiplier with lattice given by \(a=10\) and \(M=40\).
The mask was created manually using a image processing program. The mask is symmetric, such that the result will be real valued if the multiplier is applied to a real valued signal using a real valued window.