Method for estimating frequency offsets and frequency offset estimation circuit thereof

A method for estimating frequency offsets comprising:

• shifting an intermediate frequency (IF) signal from an IF band to a specific frequency band to generate a pre-offset signal according to a frequency shifting direction, where the specific frequency band is not a base band;
• performing a specific filtering operation upon the pre-offset signal to generate a filtered pre-offset signal;
• shifting the filtered pre-offset signal from the specific frequency band to the base band to generate a base-band (BB) signal according to the frequency shifting direction;
• and
• performing a frequency offset estimation upon the base-band signal.

A frequency offset estimation circuit comprising:

• a frequency shifter, for shifting a target signal from a first specific frequency band to a second specific frequency band to generate a pre-offset signal according to a frequency shifting direction and for shifting a filtered pre-offset signal from the second specific frequency band to a base band to generate a base-band (BB) signal according to the frequency shifting direction, wherein the target signal complies with a specific TV format, wherein the first specific frequency band and the second specific frequency band are different frequency bands, which are not the base-bands;
• a filter, coupled to the frequency shifter, for performing a specific filtering operation upon the pre-offset signal to generate the filtered pre-offset signal;
• and
• a frequency offset estimation module, coupled to the frequency shifter, for performing a frequency offset estimation upon the base-band signal.