Patent ID: 8676542

Claim:
An apparatus for reducing an interference portion in a time-discrete signal further comprising a useful portion, the apparatus comprising: a first provider for providing the time-discrete signal comprising the interference portion and the useful portion, the first provider being adapted to sample an iterative optical signal which corresponds to bright periods during which a transmit light source adopts an on state; a second provider for providing a first time-discrete reference signal comprising a first frequency component of the interference portion, and a second time-discrete reference signal comprising a second frequency component of the interference portion, the first and second frequency components being shifted in phase, and the second provider for providing the first and second reference signals being adapted to sample two optical signals which correspond to dark periods during which no transmit light source adopts an on state; a subtractor for generating a differential signal from the two reference signals, the differential signal comprising a third frequency component caused by the first and second frequency components; and a manipulator for manipulating the time-discrete signal on the basis of the differential signal, such that in a manipulated time-discrete signal the interference portion is reduced.