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

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 which has a value that corresponds to the first number of time intervals multiplied by the difference of the second number of time intervals and the first number of time intervals.