Patent ID: 7586999

Claim:
A method of scanning channels for a digital broadcasting receiver, the method comprising: providing a digital broadcasting receiver comprising a tuner for converting an input signal into an intermediate frequency (IF) signal; presetting a starting frequency, a time interval, a first threshold, and a second threshold, wherein the first threshold is a decreasing rate of the IF signal gain before the IF signal becomes stabilized, and wherein the second threshold is a minimum IF signal gain of a downstream channel when the IF signal becomes stabilized; scanning a channel from the staffing frequency; reading a first gain value of the IF signal from a buffer when the receiver begins to scan the channel; reading a second gain value of the IF signal from the buffer after the time interval has elapsed; determining whether a difference between the first gain value and the second gain value is less than or equal to the first threshold; determining whether the second gain value is less than or equal to the second threshold, if the difference between the first gain value and the second gain value is less than or equal to the first threshold; and the receiver moving on from the channel being currently scanned to scan a next channel, if the second gain value is greater than the second threshold.