Vehicle-mounted headrest for silencing, vehicle-mounted seat, vehicle and silencing method

The invention discloses a vehicle-mounted headrest for silencing, a vehicle-mounted seat, a vehicle and a silencing method, and relates to the technical field of vehicle noise reduction. The pillow part is arranged on one side of the micro-perforated plate, and the pillow part is communicated with the micropores; the noise reduction cavity is formed in the other side of the micro-perforated plate, and the noise reduction cavity communicates with the pillow part through the micropores; and the adjusting device is used for adjusting the functional volume of the noise reduction cavity according to the target frequency determined by the rotating speed of the motor so as to adjust the noise reduction frequency. Silencing is carried out by utilizing the principle of a resonance sound absorber, the target frequency is obtained by collecting motor rotating speed signals and calculating, the function size of the noise reduction cavity is changed and the silencing frequency is adjusted through the adjusting device acco