Abstract: A method and apparatus for phase locking the signal of a controlled oscillator (1) to that of a reference oscillator (3), a correction quantity depending on the difference between the relative phase angles of the signals being generated at correction instants for correcting the frequency of the controlled oscillator. According to the invention, the phase lock may also be achieved with a controlled oscillator (1), having a frequency which is not a whole number multiple of the reference oscillator (3) frequency by, in one embodiment, the reference oscillator signal or in another embodiment, the controlled oscillator signal being phase shifted such that the phase difference occurring at the correction instants as a result of the controlled oscillator frequency not being a non-integer multiple of the reference oscillator frequency is eliminated at the formation of the correction quantity.