Patent ID: 8576680
Filing Date: 2013-11-05
Classification: G11B

Abstract:
1. A circuit for generating a signal for controlling reproduction of data recorded on an optical disc, comprising: an amplifier to amplify an electric signal corresponding to an intensity of a reflected light from an optical disc; a first detection circuit to detect an upper envelope of an output signal from the amplifier, and to output an upper envelope signal; a second detection circuit to detect a lower envelope of an output signal from the amplifier, and to output a lower envelope signal; a first A/D converter to convert the upper envelope signal into a first digital signal; a second A/D converter to convert the lower envelope signal into a second digital signal; and a digital signal processing circuit to perform calculation processing of the first and the second digital signals, and to output a signal for controlling reproduction of data recorded on the optical disc, wherein the digital signal processing circuit is provided with: