Method and apparatus for digitally measuring the frequency of a signal by integration of its signal phase

This application claims the priority of German patent document 100 52 304.8, filed Oct. 20, 2000, the disclosure of which is expressly incorporated by reference herein. In a method and apparatus for measuring the frequency of a signal by integration of its signal phase, a phase accumulator integrates the signal phase of the signal, at predetermined time intervals. A first intermediate memory reads in a first output value of the phase accumulator after a predetermined first number of time intervals, as well as a second output value of the phase accumulator after a predetermined second number of time intervals. A second intermediate memory reads in the first output value of the first buffer register and multiplies it by a first factor which corresponds to the quotient of the second number of time intervals and the first number of time intervals. A subtracter subtracts the first output value multiplied by the first factor from the second output value; and a divider divides the output value of the subtracter by a second factor.