Patent ID: 8446992

Claim:
A digital exciter for use in RF broadcasting and having pilot signal compensation, comprising: an input digital circuit for receiving digital data at an input sample rate for use in RF broadcasting at a desired RF frequency and wherein a pilot frequency is displaced from a desired location of the frequency band because of an error in said input sample rate; a digital compensator that determines whether the pilot frequency is displaced and providing a digital correction signal in accordance therewith, said compensator further comprising a digital counter for counting clock pulses from a clock source to provide a count for use in providing an indication of any displacement of said pilot frequency; and a digital correction circuit for correcting said pilot frequency in accordance with said correction signal, the digital correction circuit comprising: a numerically controlled oscillator configured to provide an IF correction signal having a frequency that is a function of the digital correction signal; and a multiplier, receiving the IF correction signal and the IF digital signal as inputs, to produce the pilot signal compensated output.