Method for positioning a shaker and use of the shaker for vibration control

A method for performing active control of vibrations output by a loudspeaker in a seat comprising a headrest and a backrest, the headrest further comprising said loudspeaker and a shaker, the method comprising:

• characterizing the shaker by transmitting a second given signal to the shaker over a secondary audio path comprising the shaker, and determining, from the second signal and an output signal of the shaker, a set of coefficients representative of the shaker,
• characterizing said loudspeaker in said headrest, by transmitting a first given signal over a primary audio path comprising said loudspeaker, and determining, from said first signal, an output signal of said loudspeaker and the set of coefficients representative of the shaker, a set of coefficients representative of said loudspeaker, and
• applying an audio source to a first audio path comprising said loudspeaker and to a second audio path comprising said shaker and a filter derived from said set of coefficients representative of said shaker and said set of coefficients representative of said loudspeaker, said second audio path having an adjustable gain.