PTT radio system

Details PTT radio system PTT radio system

1999-04-13

2001-10-30

Trost, William G. (Department: 2683)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S352000, C455S345000, C455S152100

Reexamination Certificate

active

06311052

ABSTRACT:

BACKGROUND OF THE INVENTION
A 2-way radio is usually constructed so it is always in a receive mode to receive signals that drive a speaker, except when a PTT (push-to-talk) switch is being activated. During the time when the PTT switch is actuated, the radio only transmits signals representing sound picked up by a microphone. The 2-way radio is commonly contained in a single case with a projecting antenna, so a person must lift his/her hand to reach the PTT switch on the case to depress it.
Drivers who drive vehicles under difficult conditions, such as a bicycle or motorcycle driver manipulating in heavy traffic, generally should not be encouraged to take his/her hands off the steering bar to press the PUT switch. Since the 2-way radio is commonly mounted on the driver's waist, one solution has been to extend a cord from the 2-way radio to a switch box mounted more conveniently on the person, such as on the person's chest, or in a vehicle such as a police car. This still requires the driver to take a hand off the steering bar and to find and depress the PTT switch. Also, the presence of a cable can add danger to the driver, as when the cable becomes snagged on a stationery object as the driver moves by. Apparatus for operating a 2-way radio to switch to a transmit mode, which avoided the need for the driver to take a hand off the steering bar to find and depress a switch, and which avoided the presence of a PTT cable extending from the radio, would be of value.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, a radio system is provided for use by a vehicle driver, which enables the driver to switch and maintain the radio in the transmit mode by maintaining activation of a manual PTT (push-to-talk) switch, which avoids requiring the driver to take his/her hand off a steering bar and which avoids the need for a long cable extending from the radio. A PTT control unit includes a switch positioned for activation by a finger of the driver while the driver continues to hold the steering bar. The PTT control unit includes a transmitter that transmits a short range radio signal to a detector on the 2-way radio or located on a speaker microphone, to switch the 2-way radio to the transmit mode.
The PTT control can be mounted directly on the person's hand, with a manually-activatable switch lying at the inside of a finger of the driver. This allows the driver to operate the switch by pressing it firmly against the steering bar of a vehicle. Alternatively, the PTT control can be mounted on the steering bar of the vehicle with the switch positioned so it lies adjacent to a finger of the driver when the driver holds the steering bar during normal vehicle driving. This allows the driver to easily depress the switch without removing his/her hand from the steering bar.
The novel features of the invention are set forth with particularity in the appended claims. The invention will be best understood from the following description when read in conjunction with the accompanying drawings.


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