Verfahren und Vorrichtung zum Abtasten eines Datensignals

A method and an apparatus for scanning a data signal are provided whereby a plurality of scanning signals (P 0 , P 1 , P 2 , P 3 ) delayed successively by a respective phase difference are generated, for example, by a quadrature oscillator ( 1 ). A first data signal (D) is scanned with these scanning signals (P 0 -P 3 ) in order to generate a plurality of second data signals (D 0 -D 3 ). Because the direction of rotation of the quadrature oscillator ( 1 ) can vary, depending on random starting conditions, the direction of rotation is determined by means of phase detectors ( 4 ). These phase detectors ( 4 ) are preferably connected to the outputs of the clock dividers ( 3 ). Depending on the direction of rotation determined, the second data signals (D 0 -D 3 ) are allocated to output channels (A 0 -A 3 ) by a change-over unit ( 6 ).