A motion-detection-circuit comprising: an audio-output-receiver configured to receive an audio-output-signal from an audio output module; a motion-signal-receiver-terminal configured to receive an analog received-motion-signal from a motion-signal-receiver-module; a preliminary-motion-detector comprising a comparator (230 configured to compare: (i) a signal level of the received-motion-signal, with (ii) a potential-motion-threshold-level, and set a binary state of the prelim-motion-detected-signal based on the result of the comparison corresponding to either "no-potential-motion-detected" or "potential-motion-detected"; an analog-to-digital converter, ADC, having: an ADC-input-terminal; and an ADC-output-terminal configured to provide an ADC-output-signal that is a digital representation of a signal received at the ADC-input-terminal; a switch configured to connect either (i) the audio-output-receiver to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected"; or (ii) the motion-signal-receiver-terminal to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; a digital-motion-detector configured to process the ADC-output-signal in order to set a state of a motion-detection-signal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; and a digital-audio-processor configured to provide an audio-input-signal for the audio-output-module that is independent of the ADC-output-signal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected" by applying a digital tap processing algorithm to detect a tap as a motion; and process the ADC-output-signal as a feedback in order to provide an enhanced audio-input-signal to the audio-output-module that is based on the ADC-output-signal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected". an audio-output-receiver configured to receive an audio-output-signal from an audio output module; a motion-signal-receiver-terminal configured to receive an analog received-motion-signal from a motion-signal-receiver-module; a preliminary-motion-detector comprising a comparator (230 configured to compare: (i) a signal level of the received-motion-signal, with (ii) a potential-motion-threshold-level, and set a binary state of the prelim-motion-detected-signal based on the result of the comparison corresponding to either "no-potential-motion-detected" or "potential-motion-detected"; an analog-to-digital converter, ADC, having: an ADC-input-terminal; and an ADC-output-terminal configured to provide an ADC-output-signal that is a digital representation of a signal received at the ADC-input-terminal; a switch configured to connect either (i) the audio-output-receiver to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected"; or (ii) the motion-signal-receiver-terminal to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; an ADC-input-terminal; and an ADC-output-terminal configured to provide an ADC-output-signal that is a digital representation of a signal received at the ADC-input-terminal; a switch configured to connect either (i) the audio-output-receiver to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected"; or (ii) the motion-signal-receiver-terminal to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; (i) the audio-output-receiver to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected"; or (ii) the motion-signal-receiver-terminal to the ADC-input-terminal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; a digital-motion-detector configured to process the ADC-output-signal in order to set a state of a motion-detection-signal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected"; and a digital-audio-processor configured to provide an audio-input-signal for the audio-output-module that is independent of the ADC-output-signal if the state of the prelim-motion-detected-signal is representative of "potential-motion-detected" by applying a digital tap processing algorithm to detect a tap as a motion; and process the ADC-output-signal as a feedback in order to provide an enhanced audio-input-signal to the audio-output-module that is based on the ADC-output-signal if the state of the prelim-motion-detected-signal is representative of "no-potential-motion-detected".