Multiplex communications – Wide area network – Packet switching
Patent
1994-06-21
1995-10-31
Kizou, Hassan
Multiplex communications
Wide area network
Packet switching
370 82, 370 942, 370112, 379 93, 348 14, H04J 300, H04L 514, H04M 1106
Patent
active
054636167
ABSTRACT:
Full-duplex, concurrent voice and non-voice communication over the public switched telephone network (PSTN) is maintained by a communication interface apparatus. A voice only connection is established between two sites initially. Concurrent voice
on-voice connection then is established by pressing an engage button on the communication interface apparatus at each site. Voice communication is temporarily lost, while the connection changes from a phone-to-phone voice-only link to an interface-to-interface voice
on-voice data link. The communication interface apparatus includes a digital signal processor for converting and compressing digital voice data into a voice data packet, a modem for maintaining communication over the PSTN and a micro-controller for managing the establishment and maintenance of concurrent voice and non-voice data communication. The micro-controller monitors non-voice data availability to and from a local computer or gaming device, voice data availability to and from the digital signal processor and voice packet and non-voice data packet availability to and from the modem. In one embodiment, non-voice data is transmitted at a higher priority. Voice data is transmitted at a lower priority and buffered such that real-time performance is preserved. A compression algorithm and modem baud rate are used which enable voice data to fit within the available bandwidth left over from the non-voice data communication.
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Kruse Robert J.
Law Harmon F.
Wagner Steven R.
Advanced Protocol Systems, Inc.
Kizou Hassan
Koda Steven P.
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