Audio headset with active noise control of the non-adaptive type for listening to an audio music source and/or for “hands-free” telephony functions

An audio headset comprising two earpieces connected together by a headband and each including a transducer for playing back the sound of an audio signal that is to be reproduced, the transducer being housed in an acoustic cavity defined by a shell provided with an ear-surrounding cushion, the headset including an active noise control system comprising:

• an open-loop feedforward first branch with a first bandpass filter receiving as input a signal delivered by an external microphone suitable for picking up acoustic noise existing in the environment of the headset;
• a closed-loop feedback second branch with a second bandpass filter receiving as input an error signal delivered by an internal microphone inside the cavity;
• a third branch with a third filter;
• and
• a mixer circuit receiving as inputs the signals delivered by the first, second, and third filters and also the audio signal to be played back, and delivering as output a signal suitable, after amplification, for controlling the transducer;
• wherein:
• the active noise control is non-adaptive control, the parameters of the first, second, and third filters being predetermined parameters;
• the third filter is a stabilizer bandpass filter connected in parallel with the feedback second branch, receiving as input the signal delivered by the internal microphone, and delivering as output a signal that is applied as an input to the mixer circuit, the third filter being suitable for locally increasing the phase of the transfer function of the second filter in a predetermined instability zone;
• and
• the first, second, and third branches are arranged in parallel, and the mixer circuit is a summing circuit delivering as output a linear combination of the signals delivered by the first, second, and third filters together with at least a fraction of the audio signal to be played back, with respective weighting of the gains applied to these signals.