Apparatus and method for adapting a digital radiotelephone syste

Details Apparatus and method for adapting a digital radiotelephone syste Apparatus and method for adapting a digital radiotelephone syste

1993-10-27

1997-07-15

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Optimum frequency selection

455343, 375222, 370311, H04Q 732

Patent

active

056492995

ABSTRACT:
A digital radiotelephone system employs vocoders to convert between analog speech and a digital format suitable for transmission via radio. Under most circumstances, the highest data rate is selected for optimum audio quality. When the system occupancy exceeds a particular threshold, as detected at the fixed site of the system, some or all of the vocoders are instructed to switch to a lower data rate to provide for an increase in the number of communication channels. Further, a portable subscriber unit may autonomously change its vocoder data rate depending upon the charge state of its battery.

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