Patent ID: 6292450
Filing Date: 2001-09-18
Classification: G11B

Abstract:
A method of automatically controlling bandwidth of a waveform equalizer in an optical disc reproducing apparatus including an RF (Radio Frequency) amplifier to amplify and equalize an EFM (Eight-Fourteen Modulated) signal read from an optical disc by an optical pickup, the RF amplifier having the waveform equalizer of which the bandwidth is determined by a bandwidth control signal, the optical disc reproducing apparatus further including a digital signal processor to demodulate the EFM (Eight-Fourteen Modulated) signal amplified and equalized by the RF amplifier and to perform data PLL (Phase Locked Loop) by synchronous detection, descrambling, error detection, error correction and track buffering function, said method comprising:checking error cycles of an error signal received from the digital signal processor for respective predetermined count cycles, while varying the bandwidth control signal so as to calculate decreasing respective error rates according to the bandwidth control signal; andoutputting the bandwidth control signal having a minimum error rate out of the calculated error rates to said RF amplifier, to minimize an error rate during data reproduction of the optical disc.