A noise reduction system for reducing noise in signals received at a digital receiver, the digital receiver comprising a digital receiver input for receiving an analogue signal, analogue signal processing circuitry for processing an analogue signal, and an output for providing the processed signal to a digital signal processor, wherein: the noise reduction system is configured to be located between the digital receiver input and the analogue signal processing circuitry, and comprises: a first component comprising: an input arranged to receive the analogue signal from the digital receiver input; a processor arranged to assess the received analogue signal and to identify one or more noise signals within the received analogue signal; and an output arranged to output the results of the noise signal identification; and a second component comprising: an input arranged to receive the results of the noise signal identification from the first component; and electronic circuitry arranged, in dependence on the results of the noise signal identification, to apply one or more counter-measures to the received analogue signal to produce a modified analogue signal output to the analogue signal processing circuitry, the modified analogue signal having a reduced level of noise compared to the received analogue signal; wherein the noise reduction system is arranged to assess the modified analogue signal to identify any residual noise signals in the modified analogue signal to determine whether any further counter-measures are required. a first component comprising: an input arranged to receive the analogue signal from the digital receiver input; a processor arranged to assess the received analogue signal and to identify one or more noise signals within the received analogue signal; and an output arranged to output the results of the noise signal identification; and a second component comprising: an input arranged to receive the results of the noise signal identification from the first component; and electronic circuitry arranged, in dependence on the results of the noise signal identification, to apply one or more counter-measures to the received analogue signal to produce a modified analogue signal output to the analogue signal processing circuitry, the modified analogue signal having a reduced level of noise compared to the received analogue signal; an input arranged to receive the analogue signal from the digital receiver input; a processor arranged to assess the received analogue signal and to identify one or more noise signals within the received analogue signal; and an output arranged to output the results of the noise signal identification; and a second component comprising: an input arranged to receive the results of the noise signal identification from the first component; and electronic circuitry arranged, in dependence on the results of the noise signal identification, to apply one or more counter-measures to the received analogue signal to produce a modified analogue signal output to the analogue signal processing circuitry, the modified analogue signal having a reduced level of noise compared to the received analogue signal; an input arranged to receive the results of the noise signal identification from the first component; and electronic circuitry arranged, in dependence on the results of the noise signal identification, to apply one or more counter-measures to the received analogue signal to produce a modified analogue signal output to the analogue signal processing circuitry, the modified analogue signal having a reduced level of noise compared to the received analogue signal; wherein the noise reduction system is arranged to assess the modified analogue signal to identify any residual noise signals in the modified analogue signal to determine whether any further counter-measures are required.