Dynamic amplitude tilt equalizer

A system for equalizing amplitude tilt distortion in a signal, comprising:

• an amplitude tilt maker comprising a signal through path, a phase shifted, time delayed signal path, a splitter, a combiner, a phase shift module, a time delay module, and a voltage controlled attenuator, wherein
• an input signal to said amplitude tilt maker is split by said splitter between said signal through path and said phase shifted, time delayed signal path,
• said input signal in said phase shifted, time delayed signal path is phase shifted by said phase shift module, delayed by said time delay module, and attenuated by said voltage controlled attenuator, whereby said amplitude tilt maker varies an amplitude tilt of said input signal, and
• a time delayed, phase shifted, attenuated input signal in said phase shifted, time delayed signal path is combined in said combiner with said input signal in said signal through path to produce an output signal;
• a coupler, wherein said coupler samples said output signal and provides a signal sample of said output signal as a loop signal;
• and
• an amplitude tilt sensor comprising a frequency diplexer, an amplitude detector, and a loop filter, wherein
• said frequency diplexer receives said loop signal from said coupler,
• said frequency diplexer provides a frequency sample of said loop signal to drive said amplitude detector,
• a voltage output of said amplitude detector is fed as an input to said loop filter, and
• said loop filter outputs a control voltage to said voltage controlled attenuator to control said voltage controlled attenuator to vary said amplitude tilt so as to compensate in said output signal for an amplitude tilt distortion in said input signal.

A method for removing amplitude tilt distortion from a radio signal, comprising steps of:

• splitting an input signal between a signal through path and a phase shifted, time delayed signal path;
• passing said input signal through a voltage controlled attenuator for varying an amplitude tilt of said input signal;
• forming an output signal by combining signals from said signal through path and from said phase shifted, time delayed signal path;
• sampling said output signal and providing a signal sample of said output signal as a loop signal;
• and
• using said loop signal to control said voltage controlled attenuator to vary said amplitude tilt so as to compensate in said output signal for an amplitude tilt distortion in said input signal.