Duplex interconnect dispatch trunked radio

Details Duplex interconnect dispatch trunked radio Duplex interconnect dispatch trunked radio

1990-01-22

1995-04-18

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 951, 3701101, 455 541, 379 63, H04B 700, H04Q 704

Patent

active

054084660

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 capability. A microprocessor generates data and DTMF signaling 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 signaling.

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Manual for Microprocessor Radio Telephone Interconnect System, pp. 13-15, date unknown, published by Instrument Assiociates, Inc. of Memphis, Tenn.

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