Suppression of multipath effects in the transmission of analog TV signals

A method for compensating for multipath effects of a vestigial sideband modulated TV signal, a portion of a spectrum of the undistorted TV signal being symmetrical with respect to a video carrier frequency, the method comprising:

• receiving the vestigial sideband modulated TV signal;
• and
• analyzing deviations from symmetry of a relevant portion of the spectrum that exists in the undistorted state so as to suppress the multipath effects,
• wherein the TV signal includes an imaginary component and a real component and further comprising minimizing the imaginary component in proportion to the real component in the baseband so as to suppress the multipath effects,
• wherein the minimizing is performed using a digital filter, and further comprising determining filter coefficients using a stochastic gradient method including the following steps:
• defining an error function e(k) from the filtered signal y(k)
• calculating the gradient of the error function e(k)
• superposing the gradient of the error function
• defining a step size for adapting the filter coefficients
• defining the filter coefficients of the digital filter as components of a distortion correction vector and
• calculating the new filtered TV signal using the distortion correction vector.