Duplex interconnect/dispatch trunked radio
First Claim
1. A two-way radio frequency subscriber unit having at least two user selectable modes of communication, wherein the two user selectable modes of communication include:
- A) a first mode of communication comprising radio frequency two-way half-duplex dispatch communication to facilitate user selected two-way half-duplex dispatch communications between the two-way radio frequency subscriber unit and another communication unit; and
B) a second mode of communication comprising radio frequency full duplex telephone interconnect communication to facilitate user selected two-way full duplex telephone interconnect communications between the two-way radio frequency subscriber unit and another communication unit.
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Accused Products
Abstract
A subscriber unit for use with a duplex communication system is described. The present invention contemplates a duplex transceiver which incorporates data and voice handling capablity. A microprocessor generates data and DTMF signalling as well as decoding received data. According to the principles of the present invention, an improved duplex capable subscriber unit is achieved by coupling a microprocessor to a duplex transceiver through switchable filters. The filters exhibit a relatively fast or slow time constant depending on the state of a filter control input. The microprocessor is then capable of operating the subscriber unit with optimum frequency response characteristics depending on whether voice or data is being received. In addition, a summing network coupled between the microprocessor and the transmit switchable filter cooperates with the switchable filter and allows the duplex subscriber unit of the present invention to generate DTMF signalling.
27 Citations
7 Claims
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1. A two-way radio frequency subscriber unit having at least two user selectable modes of communication, wherein the two user selectable modes of communication include:
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A) a first mode of communication comprising radio frequency two-way half-duplex dispatch communication to facilitate user selected two-way half-duplex dispatch communications between the two-way radio frequency subscriber unit and another communication unit; and B) a second mode of communication comprising radio frequency full duplex telephone interconnect communication to facilitate user selected two-way full duplex telephone interconnect communications between the two-way radio frequency subscriber unit and another communication unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification