Patent ID: 8169551

Claim:
A method for adjusting a center frequency of a filter utilized for extracting information carried via a target channel, comprising: detecting adjacent channel interference (ACI) for the target channel to generate a channel interference information; and adjusting the center frequency of the filter for the target channel according to the channel interference information; wherein the step of detecting ACI for the target channel to generate the channel interference information comprises: comparing a degree of upper-band components in the ACI with a degree of lower-band components in the ACI to generate a comparison result; categorizing the ACI of the target channel into an upper-band ACI when the comparison result indicates that the degree of upper-band components in the ACI is greater than the degree of lower-band components in the ACI; and categorizing the ACI of the target channel into an lower-band ACI when the comparison result indicates the degree of upper-band components in the ACI is not greater than the degree of lower-band components in the ACI; and the step of adjusting the center frequency of the filter for the target channel according to the channel interference information comprises: when the ACI of the target channel is categorized to be the upper-band ACI, shifting the center frequency of the filter to a lower frequency; and when the ACI of the target channel is categorized to be the lower-band ACI, shifting the center frequency of the filter to a higher frequency.