| 摘要 |
A universal hand-free system for use with various types of cellular phones produced by different manufacturers is designed to operate in combination with a vehicle's audio stereo system. The hand-free system can automatically turn off a vehicle's audio stereo system when incoming signals are being received by a cellular phone and automatically turn on the audio stereo system as the cellular phone terminates its operation. It intends to improve the communication quality of a cellular phone and increase driving safety. Moreover, by means of signal cable, which can convert and discern incoming signals and signal criterion levels for various types of cellular phones produced by different manufacturers, the hand-free system can be universally applied to a variety of cellular phones. |
