| 摘要 |
The device installed on board a vehicle (1) comprises a sensor or sonometer (2) for directional or nondirectional measurements of surrounding noise connected to a computation chain (5) and linked to or incorporated in an apparatus for amplification such as autoradio (3) with connections to loudspeakers (4). The sensor transmits the measure of volume of noise to the computation chain which determines the increase or decrease of output volume of apparatus by cable or wireless link. The sensor or the computational link comprise an electronic or digital filter allowing to separate the sound of autoradio from the voices of occupants so to avoid increasing volume when two persons talk inside the vehicle, or from other sounds that are nuisance noises. Several sensors can be installed in a vehicle to measure noise independently at different seats, to transmit the information to balance the potentiometer of apparatus, and to vary the volumes independently from seat to seat. The sensors are placed near ears of occupants, that is in the roof of vehicle, on the instrument panel when directional, or in front of seats in the case of vehicles with sunroofs. A mobile telephone can be connected to the autoradio to cut the volume, display the number or the name of caller, or to utilize the loudspeakers installed in the vehicle. The device can be micro-placed for convenience of user. The cable can be replaced by a separate casing and the same results obtained by a wireless link. A push-button for parametrization can be designed which is activated by prolonged pressing allowing to set new base for computation and new output volume adapted to all occupants of the vehicle.
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