| 摘要 |
<p>Apparatus to be operatively connected between a cellular telephone installed within a vehicle and a radio or like speaker also installed within the vehicle, includes means to attenuate the sound level form the speaker upon the receipt of a signal that the telephone is receiving or transmitting a call. According to the invention the apparatus is arranged to increase the sound progressively at the end of the call to the level prevailing before the call so that the driver is not startled by a sudden loud noise.</p> |
