Personal communication apparatus with call switching modem and p

Details Personal communication apparatus with call switching modem and p Personal communication apparatus with call switching modem and p

1996-01-25

1998-07-07

Pham, Chi H.

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

455552, 455557, 455575, H04L 1264, H04Q 732

Patent

active

057779910

ABSTRACT:
A personal communication apparatus is disclosed, which comprises a radio transmitter 64 and a radio receiver 66 for participating in communication, a microphone 60, a loudspeaker 61, a processor 90 as a controller for controlling call switching communication and packet switching communication, a ROM 100 and a RAM 101 for storing control programs and data, a call switching modem 80 for modulating signal in the speech frequency band, and a packet switching modem 82 for modulating signal in a frequency band exceeding the speech frequency band. The outputs of the microphone 60 and call switching modem 80 are bandwidth limited by a transmission signal processing circuit 72. Communication by the packet switching modem is carried out according to a communication program. The apparatus is capable of stand alone call switching communication and also of packet switching communication, as well as functioning as a radio telephone set.

REFERENCES:
patent: 4887265 (1989-12-01), Felix
patent: 5404392 (1995-04-01), Miller et al.
patent: 5528664 (1996-06-01), Slekys et al.
patent: 5533019 (1996-07-01), Jayapalan
patent: 5546382 (1996-08-01), Fujino

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