Patent ID: 7489912

Claim:
A method for optimizing gain of a tuner for reception of a desired signal and equipped with a band-pass high frequency input filter, a band-pass intermediate frequency filter having a passband width narrower than the passband width of the input filter and amplifiers having gain automatically controlled according to an AGC characteristic of the tuner to provide a constant level of a tuner output signal IF_OUT, the method comprising the following steps: determining a level of the desired signal; identifying a passband of the input filter for the desired signal; tuning the tuner to successive frequencies within the passband of the input filter; calculating a level of signals for each tuned frequency on the basis of the gain of the amplifiers corresponding to each tuned frequency; selecting the strongest level of close signals; and calculating the AGC characteristic of the tuner on the basis of the level of the desired signal and the strongest level of close signals.