| 摘要 |
An improvement is provided for a radio system for a vehicle, such as an automobile. A pressure sensitive transducer is mounted externally on the body of the vehicle and in a position of exposure to pressure changes resulting from air resistance as the vehicle travels. The speed of a vehicle is directly related to level of ambient noise, such as road noise. The pressure sensitive transducer, provides an electrical output which varies as a function of pressure changes on the transducer. The variable electrical output is coupled either to the electrical preamplifier in the radio receiver which controls the audio volume of the radio, or in circuit to the radio speakers. The audio volume of the radio is thereby increased as the vehicle moves faster, and decreases as the vehicle slows, so as to modulate the audio output of the radio to compensate for ambient noise.
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