Patent ID: 6266522
Filing Date: 2001-07-24
Classification: H03H,H03J

Abstract:
A method of tuning a bandpass filter having an input and an output, the method comprising the steps of:identifying a desired center frequency for the bandpass filter;identifying a desired resolution and a desired confidence interval;determining a number of samples of the limited signal to achieve the identified desired resolution and confidence interval based on the identified desired center frequency;providing a signal having a substantially uniform spectral distribution at the input of the bandpass filter to thereby produce an output signal at the output of the bandpass filter;processing said output in a limiter to produce a limited signal;sampling the limited signal to obtain a plurality of samples, the number of the plurality of samples being at least as great as the determined number of samples of the limited signal to achieve the identified desired confidence level;determining an average frequency from th plurality of samples; andadjusting the bandpass filter based on the determined average frequency to achieve a center frequency for the bandpass filter which is within a predetermined range with respect to the desired center frequency.