A filter device (TP) is provided in the control loop of a frequency- and phase-regulator circuit intended in particular for a digital complex value vestigial sideband (VSB) signal or Nyquist slope filtered signal. The proposed filter device produces from the signal to be regulated a band-restricted double sideband signal which is symmetrical about a reference frequency. The regulator circuit in question is suitable for use in particular in a digital TV demodulator.
