Abstract: A method and a regenerative filter for equalizing an input digital signal is proposed, wherein the received input signals is processed by means of threshold decision elements, multiplexers, and a delay unit 6, which regenerates a delayed signal for switching the multiplexer, wherein the input signal 1 passes in parallel through at least 4 threshold decision elements 2 and the output signals 3 of the threshold decision elements 2 are connected by at least one multiplexer 4 to the delay unit 6 and the delay unit 6 is comprised of at least two delay stages, whose delayed signals 9, 10 switch the at least one multiplexer 4.

Abstract: In a digital optical transmission system, such as a passive optical distribution network, analog electric signals, e.g., video signals, are to be optically transmitted in such a way that they can be recovered in a receiver (BONT) in a simple manner. To accomplish this, the transmitter of the transmission system includes a delta-sigma modulator (MOD) and an electrical-to-optical transducer (EO). The delta-sigma modulator (MOD) digitizes the analog electric signals using the delta-sigma modulation method. The electrical-to-optical transducer (EO) then converts the digitized signals to optical signals, which are transmitted over optical fibers to a plurality of receivers (BONT). To recover the analog electric signals, each receiver (BONT) requires only one optical-to-electrical transducer (OE) and one passive electric filter (FIL). The filter (FIL) is a passive low-pass filter in one case and a passive bandpass filter in another.