Patent ID: 8184741

Claim:
A receiving device, comprising: a first signal processor, for receiving a radio frequency signal, and converting the radio frequency signal to generate a first signal, wherein the radio frequency signal comprises a plurality of frames; a second signal processor, coupled to the first signal processor, for performing a Fourier transform operation on the first signal according to a synchronization signal to generate an output signal; a first filter, coupled to the first signal processor, for filtering the first signal to generate a second signal; and a synchronization detection circuit, coupled to the first filter, for detecting the second signal to generate the synchronization signal; wherein the first signal comprises a channel signal and at least a portion of neighboring channel signals from neighboring channels, the second signal comprises a null period of the channel signal, and the output signal corresponds to the channel signal, and the first signal processor comprises: a tuner, for selecting and receiving an input signal to generate a third signal; a first sampling device, for generating a digital signal according to the third signal; a second low pass filter, having an input coupled to an output of the first sampling device, for receiving the digital signal from the first sampling device, and filtering the received digital signal to generate a fourth signal; and a second sampling device, having an input coupled to an output of the second low pass filter, for receiving the fourth signal from the second low pass filter, and generating the first signal according to the received fourth signal.