Noise reduction system

A noise reduction system for reducing noise generated from an MRI device and including impact noise repetitively generated at a time interval, the system comprising:

• an error signal generator that generates an error signal based on the noise being detected;
• an estimated noise generator that generates an estimated noise signal based on the error signal and a first control signal, the estimated noise signal indicating an estimate of a sound pressure of the noise;
• a delay signal generator that has a time delay characteristic and delays the estimated noise signal to generate a delay signal, the time delay characteristic being determined based on an imaging sequence or pre-scanning by the MRI device and corresponding to the time interval;
• a control filter that generates the first control signal from the delay signal;
• and
• a loudspeaker unit including at least one pair of a first filter and a control loudspeaker and a transmission unit, the first filter generating a second control signal from the first control signal, the control loudspeaker converting the second control signal into a sound wave to output a control sound, the transmission unit transmitting the control sound.