Multiple PTT functionality
First Claim
1. A push-to-talk (PTT) device comprising:
- a channel selector that selects a first frequency on which to receive and transmit in accordance with a state of a PTT button;
the PTT button configured to activates transmission of a first PTT signal from the device on the first frequency when pressed and to activate reception of a second PTT signal on the first frequency when not pressed;
a multiple PTT key, different from the PTT button, that when pressed activates a multiple PTT function that selects a new transmission frequency on which to transmit, different from the first transmit frequency, while the reception frequency of the device remains at the first frequency; and
a keypad containing a plurality of keys that, when the multiple PTT function is activated by the multiple PTT key, determine a new transmission frequency of the device on which to transmit, different from the first transmit frequency, dependent on a particular selection of one of more of the plurality of keys.
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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.
16 Citations
20 Claims
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1. A push-to-talk (PTT) device comprising:
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a channel selector that selects a first frequency on which to receive and transmit in accordance with a state of a PTT button; the PTT button configured to activates transmission of a first PTT signal from the device on the first frequency when pressed and to activate reception of a second PTT signal on the first frequency when not pressed; a multiple PTT key, different from the PTT button, that when pressed activates a multiple PTT function that selects a new transmission frequency on which to transmit, different from the first transmit frequency, while the reception frequency of the device remains at the first frequency; and a keypad containing a plurality of keys that, when the multiple PTT function is activated by the multiple PTT key, determine a new transmission frequency of the device on which to transmit, different from the first transmit frequency, dependent on a particular selection of one of more of the plurality of keys. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A push-to-talk (PTT) network comprising a plurality of PTT devices, each of the PTT devices capable of belonging to a plurality of groups and comprising:
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a channel selector that selects a first frequency on which to receive and transmit in accordance with a state of a PTT button dependent on a group to which the PTT device belongs; the PTT button configured to activates transmission of a first PTT signal from the device on the first frequency when pressed and to activate reception of a second PTT signal on the first frequency when not pressed; a multiple PTT key, different from the PTT button, that when pressed activates a multiple PTT function that selects a new transmission frequency on which to transmit, different from the first transmit frequency, while the reception frequency of the device remains at the first frequency; and an input having a plurality of different input states that, when the multiple PTT function is activated by the multiple PTT key, determines a new transmission frequency of the device on which to transmit, different from the first transmit frequency, dependent on a particular input state selected. - View Dependent Claims (12, 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 a first frequency to receive and transmit via a channel selector; receiving a first PTT signal on the first frequency while a PTT button is not pressed; transmitting a second PTT signal from the device on the first frequency while the PTT button is pressed; detecting activation of a multiple PTT function via a multiple PTT key, different from the PTT button; responsively selecting a new transmission frequency on which to transmit but not a new reception frequency when the multiple PTT function is activated by the multiple PTT key, the new transmission frequency being selected as a function of a particular selection of one or more of a plurality of input keys on a keypad; and detecting deactivation of the multiple PTT function via the multiple PTT key, and responsively reverting to the first frequency for reception and transmission when the multiple PTT function is not active. - View Dependent Claims (17, 18, 19, 20)
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Specification