Method and apparatus for converting an input scanning sequence into an output scanning sequence

A method for converting the scan values said values of an input scanning sequence occurring with an input scanning frequency into an output scanning sequence occurring with an output scanning frequency, comprising the steps of:

• defining a particular function;
• storing a set of fixed values representing the constants of a predetermined function;
• measuring the time difference between input and output scanning times of input and output scanning sequences;
• computing a set of coefficients based on said particular function and said time difference measured;
• and
• filtering said input sampling sequence using said computed coefficients and producing an output scanning sequence.

An apparatus for converting the scan values of an input scanning sequence occurring with an input scanning frequency into scan values of an output scanning sequence occurring with an output scanning frequency, comprising:

• a digital filter having an input and an output;
• circuit means for the direct calculation of filter coefficients from stored filter coefficients and from the relative time differences between the input and output scan values;
• two storage means, one of which is connected to the input of said digital filter and said circuit means, and the other of said two storage means being connected to the output of said digital filter and said circuit means;
• and
• a bypass for bypassing said digital filter, said bypass bypasses said two storage means to each other.