Multiplex communications – Wide area network – Packet switching
Patent
1987-03-18
1989-05-09
Paschall, M. H.
Multiplex communications
Wide area network
Packet switching
370 61, 379 89, H04Q 1104
Patent
active
048295140
ABSTRACT:
A digital voice recording and reproducing device, preferably connected to a telephone network uses a storage RAM to store voice messages and digital signals. An internal processor connected to the storage RAM processes digital signals to and from the storage RAM. A high speed RAM connected to the internal processor receives and transmits digital signals to and from the internal processor. Encoders and decoders encode voice signals into pulse code modulated (PCM) signals to be delivered into the high speed RAM, and decode digital PCM signals from the high speed RAM. A high speed processor (HSP) connected to the high speed RAM delivers signals from a switch to the high speed RAM. An internal processor connected to the switch, high speed RAM (HSP) and the storage RAM controls the input of signals to the high speed processor, to the high speed RAM and to the storage RAM, and controls the output of signals from the storage RAM to the internal processor and the high speed RAM, and then via the switch and the decoders to output means such as telephone lines.
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"Digital Voice Store-Forward System Answers Phones, Takes Messages", Electronics, Apr. 21, 1983.
Deglin Richard N.
Frimmel, Jr. James J.
Ouellette Thomas
Potter Lester A.
Creighton Wray James
International Telesystems Corporation
Paschall M. H.
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