Automatic frequency control apparatus and method therefor

Details Automatic frequency control apparatus and method therefor Automatic frequency control apparatus and method therefor

H - Electricity

03

L

H03L 7/00 (2006.01) H03D 3/00 (2006.01) H03J 7/26 (2006.01)

Patent

CA 2125260

An automatic frequency control apparatus includes a local oscillator, a quadrature detector, a frequency offset value estimation circuit, a demodulation circuit, a synchronization determination circuit, a memory, and an AFC circuit. The synchronization determination circuit determines reception synchronization on the basis of demodulated signals from the demodulation circuit to output a synchronization determination signal to the AFC circuit when reception synchronization is established and outputs the value to the AFC circuit. The apparatus also includes a power-on state detection circuit for outputting a detection signal to the AFC circuit. The AFC circuit determines the oscillation frequency of the local oscillator on the basis of the outputs from the above components. An automatic frequency control method is also disclosed.

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