Analog bandpass filter with an adjustable center frequency with - a parallel resonant circuit, -- whose resonance frequency (f 0) is equal to the center frequency of the bandpass filter, -- which has a first branch circuit in which a first element that determines the frequency is arranged, -- which has a second branch circuit - which is coupled in parallel to the first branch circuit - in which a second element that determines the frequency is arranged, wherein -- the first element determining the frequency is a capacitance, and - a first amplifier (OPV 1) with an adjustable amplification (Vc), inserted in the first branch circuit, and a second amplifier (OPV 2) with an adjustable amplification (V L), inserted in the second branch circuit, -- wherein, during operation, the amplifiers amplify a voltage present via the element determining the frequency which is arranged in this branch circuit (S1, S2) in a manner corresponding to the set amplification (V L or Vc) and, in this way, provoke a corresponding change in a current flowing through the relevant element determining the frequency, characterized in that -- the second element determining the frequency is an inductance, and -- the output of the first amplifier is connected to the inverting input of the first amplifier via the first element that determines the frequency, and the output of the second amplifier is connected to the inverting input of the second amplifier via the second element determining the frequency. - a parallel resonant circuit, -- whose resonance frequency (f 0) is equal to the center frequency of the bandpass filter, -- which has a first branch circuit in which a first element that determines the frequency is arranged, -- which has a second branch circuit - which is coupled in parallel to the first branch circuit - in which a second element that determines the frequency is arranged, wherein -- the first element determining the frequency is a capacitance, and -- whose resonance frequency (f 0) is equal to the center frequency of the bandpass filter, -- which has a first branch circuit in which a first element that determines the frequency is arranged, -- which has a second branch circuit - which is coupled in parallel to the first branch circuit - in which a second element that determines the frequency is arranged, wherein -- the first element determining the frequency is a capacitance, and - a first amplifier (OPV 1) with an adjustable amplification (Vc), inserted in the first branch circuit, and a second amplifier (OPV 2) with an adjustable amplification (V L), inserted in the second branch circuit, -- wherein, during operation, the amplifiers amplify a voltage present via the element determining the frequency which is arranged in this branch circuit (S1, S2) in a manner corresponding to the set amplification (V L or Vc) and, in this way, provoke a corresponding change in a current flowing through the relevant element determining the frequency, characterized in that -- the second element determining the frequency is an inductance, and -- the output of the first amplifier is connected to the inverting input of the first amplifier via the first element that determines the frequency, and the output of the second amplifier is connected to the inverting input of the second amplifier via the second element determining the frequency. -- wherein, during operation, the amplifiers amplify a voltage present via the element determining the frequency which is arranged in this branch circuit (S1, S2) in a manner corresponding to the set amplification (V L or Vc) and, in this way, provoke a corresponding change in a current flowing through the relevant element determining the frequency, -- the second element determining the frequency is an inductance, and -- the output of the first amplifier is connected to the inverting input of the first amplifier via the first element that determines the frequency, and the output of the second amplifier is connected to the inverting input of the second amplifier via the second element determining the frequency.