Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-04-13
2001-05-08
Maung, Nay (Department: 2744)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S153100, C455S550100
Reexamination Certificate
active
06230030
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a mobile telephone accessory, more particularly to a hands-free switching device for use with a mobile telephone in a car.
2. Description of the Related Art
Presently, portable communications devices, such as mobile telephones, are in widespread use. It is dangerous for one to use the mobile telephone while driving a car. Since only one hand of the user is available to control the car movement.
Hands-free devices are currently in use to overcome the aforesaid drawback. A conventional hands-free device includes a loudspeaker unit connected to a mobile telephone and disposed in a car. The conventional hands-free device will damage the interior of the car during installation. Furthermore it is not convenient for the user to turn off an audio output unit, such as a radio, in the car in the event of an incoming phone call.
Another conventional hands-free device includes an earphone that serves as a receiver for a mobile telephone. The earphone must be worn by the user to enable him/her to receive a phone call while driving a car. Use of the earphone while driving results in discomfort for the user.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a hands-free switching device for use with a mobile telephone that facilitates making or receiving a phone call while driving a car.
According to this invention, a hands-free switching device is adapted for use with a mobile telephone in a car having an audio output unit and a loudspeaker unit. The hands-free switching device includes a switch unit, a switch driver, and a driver control unit.
The switch unit has a set of first input switch contacts adapted to be connected to the mobile telephone, a set of second input switch contacts adapted to be connected to the audio output unit, a set of output switch contacts adapted to be connected to the loudspeaker unit, and a set of movable switch contacts connected electrically to the output switch contacts and movable between an activated position, where the movable switch contacts interconnect the first input switch contacts and the output switch contacts to enable speech signals from the mobile telephone to be reproduced at the loudspeaker unit, and a deactivated position, where the movable switch contacts interconnect the second input switch contacts and the output switch contacts to enable audio signals from the audio output unit to be reproduced at the loudspeaker unit.
The switch driver is associated operably with the movable switch contacts and is capable of being enabled so as to move the movable switch contacts from the deactivated position to the activated position.
The driver control unit is connected to the switch driver and is adapted to be connected to the mobile telephone so as to receive an output signal therefrom. The driver control unit enables the switch driver upon detection of the output signal from the mobile telephone.
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Foley & Lardner
Halfa Enterprise Co., LTD
Maung Nay
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