US Patent No: 6,515,984

Number of patents in Portfolio can not be more than 2000

Data/voice/fax compression multiplexer

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Abstract

A data multiplexing network is described which multiplexes a plurality of asynchronous data channels with an asynchronous data stream representing compressed voice signals and/or facsimile signals onto a single synchronous data packet stream. The single synchronous data packet stream is then transmitted by a high speed statistical multiplexer over a composite link to a second site using a modified high-level synchronous data link control protocol with an overlay of a priority statistical multiplexing algorithm. The asynchronous data channels and the compressed voice channel and/or facsimile signals are demultiplexed and reconstructed for sending to other asynchronous computer terminals and to a standard telephone or facsimile analog port at the second site, respectively. PBX trunk interfaces are also provided to allow PBX's to share the composite link between sites. Communication between the first site by voice or facsimile and the second site is transparent to the users. The multiplexer efficiently allocated the bandwidth of the composite link by detecting silence periods in the voice signals and suppressing the sending of the voice information to preserve bandwidth. The transmission of facsimile information is performed by decoding the fax transmissions, sending only the facsimile image packets over the multiplexed composite link and reassembling, with carrier, the facsimile signals at the remote site for transmission over an analog telephone line to a remote facsimile machine.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MULTI-TECH SYSTEMS, INC.MOUNDS VIEW, MN76

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Arimilli, Harinarayana Coon Rapids, MN 13 258
Kanchan, Vasant Kumar Sunnyvale, CA 3 71
Thanawala, Ashish A Saratoga, CA 4 178

Cited Art

Patent Info (Count) # Cites Year
 
MULTI-TECH SYSTEMS, INC. (12)
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5,452,289 Computer-based multifunction personal communications system 300 1993
5,355,365 Intelligent local area network modem node 64 1993
5,535,204 Ringdown and ringback signalling for a computer-based multifunction personal communications system 33 1993
5,453,986 Dual port interface for a computer-based multifunction personal communication system 87 1993
5,682,386 Data/voice/fax compression multiplexer 50 1994
5,471,470 Computer-based multifunction personal communications system 102 1994
5,546,448 Apparatus and method for a caller ID modem interface 103 1994
6,009,082 Computer-based multifunction personal communication system with caller ID 27 1994
5,619,508 Dual port interface for a computer-based multifunction personal communication system 35 1995
5,600,649 Digital simultaneous voice and data modem 71 1995
6,151,333 Data/voice/fax compression multiplexer 13 1997
 
FUJITSU LIMITED (10)
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4,794,595 Voice and data transmission system 27 1987
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5,086,471 Gain-shape vector quantization apparatus 50 1990
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5,146,470 Adaptive digital filter including low-pass filter 53 1990
5,182,762 Modem having speed notifying means 51 1991
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3COM CORPORATION (3)
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NORTEL NETWORKS LIMITED (3)
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RACAL-DATACOM, INC. (3)
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TELOGY NETWORKS, INC. (3)
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ACADEMY OF APPLIED SCIENCE (2)
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APPLE INC. (2)
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B. GILES BROPHY (SEE RECORD FOR THE REMAINING ASSIGNEES) (2)
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COMSAT CORPORATION (2)
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CYGNET TECHNOLOGIES, INC., (2)
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GATEWAY 2000, INC. (2)
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GENERAL ELECTRIC COMPANY (2)
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4,901,333 Data transmission systems 65 1987
 
HASHIMOTO CORPORATION (2)
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5,521,975 Telephone terminal device with means for detecting abandonment of call 8 1994
 
NIPPON ELECTRIC CO., LTD. (2)
4,354,273 ADPCM System for speech or like signals 38 1980
4,500,987 Loop transmission system 147 1982
 
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (2)
5,272,695 Subband echo canceller with adjustable coefficients using a series of step sizes 78 1991
5,187,692 Acoustic transfer function simulating method and simulator using the same 55 1992
 
PARADYNE CORPORATION (2)
5,081,647 Communication of a voice signal via continuous quadrature amplitude modulator 53 1989
5,301,246 Data communications equipment security device using calling party directory number 52 1992
 
QUALCOMM INCORPORATED (2)
5,414,796 Variable rate vocoder 393 1993
5,479,475 Method and system for providing communication between standard terminal equipment using a remote communication unit 54 1993
 
SUMMIT TECHNOLOGY SYSTEMS, LP (2)
5,448,555 Simultaneous analog and digital communication 79 1993
5,457,601 Credit card-sized modem with modular DAA 108 1993
 
ALCATEL ITALIA S.P.A. (1)
5,227,876 Method and system for transmitting packages of data 38 1990
 
AMI SEMICONDUCTOR, INC. (1)
4,377,860 Bandwidth reduction method and structure for combining voice and data in a PCM channel 72 1981
 
APPLIED SPECTRUM TECHNOLOGIES, INC. (1)
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ARK ELECTRONICS (1)
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AT&T IPM CORP. (1)
5,675,640 Telephone ringing signal detector 66 1995
 
BEAVER; BRYAN (1)
4,295,292 Demolition derby toy 7 1979
 
BELL ATLANTIC NETWORK SERVICES, INC. (1)
5,479,407 Channel utilization method and system for ISDN 74 1994
 
BETTERPRIZE LIMITED (1)
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BRANDYWINE COMMUNICATIONS TECHNOLOGIES LLC (1)
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CARDIFF SOFTWARE, INC. (1)
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CISCO SYSTEMS, INC. (1)
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CITIBANK, F.S.B. 500 WEST MADISON STREET (1)
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CODEX CORPORATION (1)
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CONEXANT, INC. (1)
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CRAY COMMUNICATIONS LIMITED (1)
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CROWDER, JACK SR. (1)
4,546,212 Data/voice adapter for telephone network 137 1984
 
CSELT - CENTRO STUDI E LABORATORI TELECOMUNICAZIONI S.P.A. (1)
4,528,425 Method of and circuitry for detecting, at a telephone exchange, the lifting of a subscriber's handset in response to ringing current emitted by the exchange 10 1983
 
CURRENT LOGIC SYSTEMS, INC. (SAN JOSE, CA) (1)
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DATA RACE, INC. (1)
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DELAWARE PMC-SIERRA, INC. (1)
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DIES CELLULAR LLC (1)
5,699,417 Text transmission using DTMF signalling 17 1995
 
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FIGGIE INTERNATIONAL INC. (1)
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FIRST CHICAGO/NBD BANK N.A. (1)
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HLF CORPORATION (1)
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ILLINOIS TOOL WORKS INC. (1)
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UNIVERSITY OF MARYLAND, BALTIMORE (1)
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OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (10)
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4,446,555 Time division multiplex switching network for multiservice digital networks 79 1982
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5,440,717 Computer pipeline including dual-ported, content-addressable writebuffer 26 1994
5,390,239 Method for increasing digital data throughput over telephone lines 84 1994

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
BROADCOM CORPORATION (4)
7,423,983 Voice and data exchange over a packet based network 10 2000
7,161,931 Voice and data exchange over a packet based network 67 2000
7,933,227 Voice and data exchange over a packet based network 1 2008
8,254,404 Gateway with voice 0 2009
 
SAMSUNG ELECTRONICS CO., LTD. (2)
7,376,124 Voice over internet protocol gateway and a method for controlling the same 1 2002
8,284,763 Voice over internet protocol gateway and a method for controlling the same 0 2008
 
CISCO TECHNOLOGY, INC. (1)
6,977,911 Scalable voice over IP system configured for dynamically switching codecs during a call 8 2000
 
HITACHI, LTD. (1)
7,139,265 Packet communication system 0 2003

Maintenance Fees

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11.5 Year Payment $7400.00 $3700.00 $1850.00 Aug 4, 2014
Fee Large entity fee small entity fee micro entity fee
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00