A feedback device for a gas ionisation particle detector, the detector comprising a detection chamber containing gas, an electronic read unit configured to collect an electrical signal induced by a particle passing through the detection chamber to output a measurement signal, and a high-voltage generator configured to create a potential difference between electrodes placed in the detection chamber, said feedback device comprising a voltage regulator configured to: - calculate a characteristic indicator of the measurement signal output by the electronic read unit; and - modify a voltage setpoint output to the high-voltage generator as a function of the calculated characteristic indicator; said feedback device being characterised in that it further includes a noise discrimination unit configured to implement a trajectory reconstruction algorithm to reconstruct a trajectory of the particle passing through the detection chamber and verify whether the collected electrical signal has been induced along the reconstructed trajectory, thereby determining that the measurement signal output by the electronic read unit is not noise so as to eliminate the noise, at least partially, from the calculation of the characteristic indicator; and in that the voltage regulator is configured to calculate the characteristic indicator of the measurement signal based on samples of the measurement signal corresponding to a collection, by the electronic read unit, of the electrical signal determined as having been induced along the trajectory of the particle reconstructed by the noise discrimination unit. - calculate a characteristic indicator of the measurement signal output by the electronic read unit; and - modify a voltage setpoint output to the high-voltage generator as a function of the calculated characteristic indicator; said feedback device being characterised in that it further includes a noise discrimination unit configured to implement a trajectory reconstruction algorithm to reconstruct a trajectory of the particle passing through the detection chamber and verify whether the collected electrical signal has been induced along the reconstructed trajectory, thereby determining that the measurement signal output by the electronic read unit is not noise so as to eliminate the noise, at least partially, from the calculation of the characteristic indicator; and in that the voltage regulator is configured to calculate the characteristic indicator of the measurement signal based on samples of the measurement signal corresponding to a collection, by the electronic read unit, of the electrical signal determined as having been induced along the trajectory of the particle reconstructed by the noise discrimination unit. said feedback device being characterised in that it further includes a noise discrimination unit configured to implement a trajectory reconstruction algorithm to reconstruct a trajectory of the particle passing through the detection chamber and verify whether the collected electrical signal has been induced along the reconstructed trajectory, thereby determining that the measurement signal output by the electronic read unit is not noise so as to eliminate the noise, at least partially, from the calculation of the characteristic indicator; and in that the voltage regulator is configured to calculate the characteristic indicator of the measurement signal based on samples of the measurement signal corresponding to a collection, by the electronic read unit, of the electrical signal determined as having been induced along the trajectory of the particle reconstructed by the noise discrimination unit.