On-vehicle sound control system

An on-vehicle sound control system, comprising:

• a speaker configured to output a canceling sound for canceling noise;
• a controller configured to control the speaker;
• and
• a distance estimation device configured to estimate a distance between the speaker and an ear of an occupant,
• wherein the speaker is provided in a reclining part of an occupant seat,
• wherein the distance estimation device includes:
• a front-back position sensor configured to detect a front-back position of the occupant seat;
• a reclining angle sensor configured to detect a reclining angle of the reclining part;
• a camera configured to capture an image of a head of the occupant;
• a seat position calculation unit configured to calculate a position of the speaker based on the front-back position and the reclining angle;
• an image processing unit configured to calculate a head position and a head angle of the occupant by performing image processing on the image captured by the camera, and determine a position of the ear of the occupant from the head position and the head angle;
• and
• a relative distance calculation unit configured to calculate a relative distance from the speaker to the ear based on the position of the speaker and the position of the ear,
• wherein the controller comprises a control filter configured to generate a control signal for controlling the speaker and a control signal correction unit configured to correct the control signal based on the relative distance and to output a corrected control signal, and the controller controls the speaker based on the corrected control signal.