Digital Optical Receiver

EE 19 June 1988 DIGITAL OPTICAL RECEIVER Last month"s design of a digital optical transmitter for compact disc players is completed with a receiver and a converter board offering a true 2-channel 16-bit DAC with quadruple oversampling. Like the transmitter, the present design is based on recently introduced high-quality audio ICs which come as simple-to-use modules. The digital-to-analogue converter board has an input for the optical receiver, and two switchable coax cable inputs for CD signals to the Philips/Sony standard. The converter board provides two line outputs, two adjustable headphone out- puts, and a monitor output which enables the digital signal to be fed to other equipment. A phase-locked loop (PLL) in the re- ceiver ensures synchronization to the clock pulses. Locking is indicated by a LED. A further LED indicates auto- matical activity of the on-board de- emphasis circuitry. Circuit descriptions Optical receiver. The receiver is connected to the fibre op- tic cable...