Patent ID: 8774333

Claim:
A signal processing apparatus, comprising: a signal generating block, arranged to generate a target estimated signal of a specific signal component in an input signal, comprising: a reference signal generating circuit, arranged to generate a reference estimated signal for the specific signal component in the input signal; a signal processing circuit, coupled to the reference signal generating circuit, the signal processing circuit arranged to process the reference estimated signal and accordingly generate a signal processing result; and a signal adjusting circuit, coupled to the signal processing circuit and the reference signal generating circuit, the signal adjusting circuit arranged to output the target estimated signal by adjusting the reference estimated signal according to the signal processing result; wherein the signal processing circuit comprises: a mixer module, arranged to generate a mixer output by mixing the input signal and the reference estimated signal; and an integration module, coupled to the mixer module, the integration module arranged to integrate the mixer output and accordingly generate the signal processing result; and the signal adjusting circuit comprises: an amplitude adjusting module, arranged to adjust an amplitude of the reference estimated signal according to the signal processing result; and a frequency adjusting module, arranged to generate a frequency control signal to the reference signal generating circuit according to the signal processing result, wherein the frequency adjusting module comprises: a frequency discriminator, arranged to discriminate a frequency offset between a frequency of the estimate signal and a frequency of the specific signal component of the input signal; and a filter, arranged to generate the frequency control signal according to an output of the frequency discriminator.