Automatic frequency control method of digital audio broadcasting receiver and tuner and channel decoding chip

The invention discloses an automatic frequency control method of digital audio broadcasting receivers, comprising the following steps: respectively calculating decimal frequency deviation, integral frequency deviation and residual frequency deviation by a channel decoding unit; correcting the decimal frequency deviation and integral frequency deviation by the phase-locked loop of a tuner; and correcting the residual frequency deviation by a digital frequency converter based on CORDIC arithmetic; the frequency correcting range and performance can be effectively enhanced. The invention further discloses a tuner and channel decoding chip which adopt the automatic frequency control method of digital audio broadcasting receivers; the tuner and channel decoding chip are integrated in a single chip, which is convenient for the implementing of the automatic frequency control method of digital audio broadcasting receivers and reduces the cost of the digital audio broadcasting receivers.