A headset, comprising: a sensing microphone that detects an acoustic signal, and converts the acoustic signal into a microphone signal; an audio processor; a conductor element coupled between the sensing microphone and a reverse bias circuit, the conductor element having a first wire coupled to a positive line of the sensing microphone and a second wire coupled to a negative line of the sensing microphone, the negative line being directly connected to a metallic housing of the sensing microphone; the reverse bias circuit connected between the conductor element and the audio processor, the reverse bias circuit being a circuit comprising: a microphone bias voltage input connected at the first wire of the conductor element; an RC circuit (35,37) coupled to the second wire of the conductor element; an amplifier comprising a first input terminal coupled to the RC circuit and a second input terminal coupled to a voltage source (Vcm); and an output terminal of the amplifier configured to output a voltage from the amplifier towards the audio processor in response to signals received at the first and second input terminals; wherein the reverse bias circuit is configured to decrease an impedance on the positive line of the sensing microphone and to reduce a stray ambient radio frequency field that enters the conductor element during an exchange of the microphone signal between the sensing microphone and the audio processor. a sensing microphone that detects an acoustic signal, and converts the acoustic signal into a microphone signal; an audio processor; a conductor element coupled between the sensing microphone and a reverse bias circuit, the conductor element having a first wire coupled to a positive line of the sensing microphone and a second wire coupled to a negative line of the sensing microphone, the negative line being directly connected to a metallic housing of the sensing microphone; the reverse bias circuit connected between the conductor element and the audio processor, the reverse bias circuit being a circuit comprising: a microphone bias voltage input connected at the first wire of the conductor element; an RC circuit (35,37) coupled to the second wire of the conductor element; an amplifier comprising a first input terminal coupled to the RC circuit and a second input terminal coupled to a voltage source (Vcm); and an output terminal of the amplifier configured to output a voltage from the amplifier towards the audio processor in response to signals received at the first and second input terminals; wherein the reverse bias circuit is configured to decrease an impedance on the positive line of the sensing microphone and to reduce a stray ambient radio frequency field that enters the conductor element during an exchange of the microphone signal between the sensing microphone and the audio processor. a microphone bias voltage input connected at the first wire of the conductor element; an RC circuit (35,37) coupled to the second wire of the conductor element; an amplifier comprising a first input terminal coupled to the RC circuit and a second input terminal coupled to a voltage source (Vcm); and an output terminal of the amplifier configured to output a voltage from the amplifier towards the audio processor in response to signals received at the first and second input terminals; wherein the reverse bias circuit is configured to decrease an impedance on the positive line of the sensing microphone and to reduce a stray ambient radio frequency field that enters the conductor element during an exchange of the microphone signal between the sensing microphone and the audio processor.