MULTIPLE PTT FUNCTIONALITY
First Claim
1. A push-to-talk (PTT) device comprising:
- a channel selector that selects an initial frequency to receive and transmit;
a PTT button that activates transmission of a PTT signal from the device when pressed;
a PTT key that activates a multiple PTT function; and
a keypad containing keys at least one of which that, when the multiple PTT function is active, changes the transmission frequency of the device dependent on the key selected on the keypad and a channel determined by the channel selector.
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Accused Products
Abstract
A communication device and method are presented. The device is in a network of devices of different groups. The device contains a push-to-talk (PTT) button, a channel selector, and a keyboard containing hard or soft keys. The channel selector selects an initial frequency at which to receive and transmit, dependent on the group to which the device belongs. The device transmits when the PTT button is pressed. If a multiple PTT function is activated by software in the device, at least some of the keys are used to select a new transmission frequency. The device receives at the initial frequency independent of the transmission frequency. The multiple PTT function can be activated by a dedicated soft or hard key or a key on the keyboard that serves multiple functions. The frequency selection provided by the keys is dependent on the channel and the device group.
27 Citations
20 Claims
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1. A push-to-talk (PTT) device comprising:
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a channel selector that selects an initial frequency to receive and transmit; a PTT button that activates transmission of a PTT signal from the device when pressed; a PTT key that activates a multiple PTT function; and a keypad containing keys at least one of which that, when the multiple PTT function is active, changes the transmission frequency of the device dependent on the key selected on the keypad and a channel determined by the channel selector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A push-to-talk (PTT) network comprising a plurality of PTT devices, each of the PTT devices belonging to a group and comprising:
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a channel selector that selects an initial frequency to receive and transmit; a PTT button that activates transmission of a PTT signal from the device when pressed; a PTT key that activates a multiple PTT function; and a keypad containing keys at least one of which that, when the multiple PTT function is active, changes the transmission frequency of the device dependent on the key selected on the keypad and a channel determined by the channel selector, the initial frequency and the changed transmission frequency also dependant on the group to which the PTT device belongs. - View Dependent Claims (13, 14, 15)
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16. A method of communicating with a plurality of push-to-talk (PTT) devices in a PTT network, the method comprising on at least one of the devices:
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selecting an initial frequency to receive and transmit; activating transmission of a PTT signal from the device; activating a multiple PTT function; and changing the transmission frequency of the device when the multiple PTT function is active dependent on the initial transmission frequency and other inputs from the PTT device. - View Dependent Claims (17, 18, 19, 20)
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Specification