Multiplexed digital packet telephone system

Details Multiplexed digital packet telephone system Multiplexed digital packet telephone system

1987-11-09

1988-11-01

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 60, 370 94, H04J 1500, H04J 324

Patent

active

047824859

ABSTRACT:
An efficient system for simultaneously conveying a large number of telephone conversations over a much smaller number of relatively low-bandwidth digital communication channels is disclosed. Each incoming telephone speech signal is filtered, periodically sampled, and digitized. An efficient computational speech compression algorithm is applied to transform a sequence of digitized speech samples into a much shorter sequence of compression variables. The compression variables sequence is further processed to construct a minimum-length bit string, and an identifying header is appended to form a packet. Only a few packets containing information on representative background noise are generated during pauses in speech, thereby conserving digital bandwidth. The packets are queued and transmitted asynchronously over the first available serial digital communication channel. Numerical feedback to the compression algorithm is employed which results in the packet size being reduced during periods of high digital channel usage. Packet header information is utilized to establish a "virtual circuit" between sender and receiver.

REFERENCES:
patent: Re25546 (1964-03-01), Saal et al.
patent: 3686442 (1972-08-01), Schlichte
patent: 4100377 (1978-07-01), Flanagan
patent: 4153816 (1979-05-01), Morgan
patent: 4205200 (1980-05-01), Parikh et al.
patent: 4205202 (1980-05-01), Kahn
patent: 4255620 (1981-03-01), Harris et al.
patent: 4271499 (1981-06-01), Leveque
patent: 4383316 (1983-05-01), Seidel
patent: 4408324 (1983-10-01), Black et al.
patent: 4433411 (1984-02-01), Gefroerer et al.
patent: 4453247 (1984-06-01), Suzuki et al.
patent: 4503510 (1985-03-01), Weaver
patent: 4506359 (1985-03-01), Henquin et al.
patent: 4512013 (1985-04-01), Nash et al.
patent: 4519073 (1985-05-01), Bertocci et al.
patent: 4589110 (1986-05-01), Eng et al.
patent: 4730348 (1988-03-01), Mc Crisken
"The Telephone Voice of the Future", by Bishnu S. Atal and Richard Q. Hofacker, Jr., Jul. 1985 issue of Record, pp. 4-8, 10.
"Tomorrow's Talk Today", Jul. 1985 issue of Record, p. 9.
Proceedings of the International Zurich Seminar on Digital Communications, Mar. 12-15, 1974-Zurich, pp. B7(1)-B7(3), IEEE New York, U.S.; M. Tschanz: "The Exploitation of Statistical Properties of Speech Signals for Address-Coded Transmission".
International Switching Symposium, May 7-11, 1979, Paris, pp. 757-764, Y. Ikeda et al: "Virtual Circuit Switching System: A New System Concept for Telephone and Data Integration".
IEEE Transactions on Communications, vol. COM-32, No. 4, Apr. 1984, pp. 403-410 IEEE, New York, U.S.; N.-M. Kim et al., "A Multisubscriber Variable-Rate Sampling HCDM System with Dynamic Buffer Control".

Affiliated with

Also associated with

Rating

Multiplexed digital packet telephone system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiplexed digital packet telephone system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiplexed digital packet telephone system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-894848