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WO1996018261B1 - High speed communications system for analog subscriber connections - Google Patents

High speed communications system for analog subscriber connections

Info

Publication number
WO1996018261B1
WO1996018261B1 PCT/US1995/015924 US9515924W WO9618261B1 WO 1996018261 B1 WO1996018261 B1 WO 1996018261B1 US 9515924 W US9515924 W US 9515924W WO 9618261 B1 WO9618261 B1 WO 9618261B1
Authority
WO
WIPO (PCT)
Prior art keywords
analog
high speed
digital
data transfer
speed data
Prior art date
Application number
PCT/US1995/015924
Other languages
French (fr)
Other versions
WO1996018261A3 (en
WO1996018261A2 (en
Filing date
Publication date
Application filed filed Critical
Priority to CA002182974A priority Critical patent/CA2182974C/en
Priority to EP95943030A priority patent/EP0745302B1/en
Priority to AU44184/96A priority patent/AU701274B2/en
Priority to AT95943030T priority patent/ATE265120T1/en
Priority to JP51778596A priority patent/JP4291410B2/en
Priority to DE69532919T priority patent/DE69532919T2/en
Publication of WO1996018261A2 publication Critical patent/WO1996018261A2/en
Publication of WO1996018261A3 publication Critical patent/WO1996018261A3/en
Publication of WO1996018261B1 publication Critical patent/WO1996018261B1/en

Links

Abstract

A new data communication system is described which enables data transmission over existing telephone lines at rates higher than possible with existing methods, including conventional modems. By using a novel asymmetric configuration of the two communication endpoints, the currently-accepted maximum theoretical limits on the data rate are no longer applicable. One endpoint is connected directly to a digital telephone network, whereas the other endpoint uses a conventional telephone connection. This reduces the transmission problem to compensation for a single telephone line interface and a single analog local loop. Means of providing this compensation and the required clock synchronization were also created, enabling a practical implementation of the system. The new system can achieve rates up to 64,000 bits-per-second and has broad utility in several active areas including wide-band audio transmission, video transmission, networking, facsimile transmission, and remote computer access.

Claims

5 6AMENDED CLAIMS[received by the International Bureau on 17 September 1996 (17.09.96); original claims 1, 2, 5-11, 13 and 14 amended; remaining claims unchanged (3 pages)]
1. A high speed data transfer system for communicating between a digital data source and an analog subscriber connected to a digital telephone network by an analog loop comprising: an encoder coupled to said digital data source, said encoder converting an input from said data source into a series of codewords from a set of codewords corresponding to quantizer values utilized by said digital telephone network; an interface for transmitting said series of codewords in digital form from said encoder to said digital telephone network; said digital telephone network being coupled to said analog subscriber by said analog loop, wherein said analog loop provides an analog signal to said subscriber, which analog signal is an analog representation of said series of codewords; and a decoder responsive to said analog signal to reconstruct said series of codewords in digital form from said analog signal.
2. A high speed data transfer system according to claim 1, wherein said distortion comprises at least one of: electrical distortion on said analog loop; distortion due to conversion from digital to analog at an interface between said digital telephone network and said analog loop; and distortion due to filtering occurring at an interface between said digital telephone network and said analog loop.
3. A high speed data transfer system according to claim 2 wherein said conversion from digital to analog includes a non-linear companding circuit.
4. A high speed data transfer system according to claim 1 wherein said encoder further comprises a circuit for adapting said digital data to a format suitable for application to said telephone network. 5 7
5. A high speed data transfer system according to claim 1 wherein said encoder further comprises a DC eliminator coupled between said digital data source and said digital telephone network.
6. A high speed data transfer system according to claim 1 wherein said decoder further comprises a training means for adjusting a parameter of said decoder using said analog signal.
7. A high speed data transfer system according to claim 1 wherein a parameter of said decoder is initialized using a predetermined data sequence as said series of codewords.
8. A high speed data transfer system according to claim 1 wherein said decoder further comprises a clock synchronization system responsive to said analog signal for enabling said decoder to align said analog signal with a corresponding digital representation used by the digital telephone network.
9. A high speed data transfer system according to claim 8, wherein said clock synchronization system comprises: a clock estimator which provides an estimate of the sampling rate used to generate said analog signal; a delay estimation means for determining a degree of error in said estimate; and a circuit means for using said degree of error to update said estimate.
10. A high speed data transfer system according to claim 1, wherein said decoder comprises: an inverse filter responsive to said analog signal to produce a partially distortion compensated signal; and a decision means for converting the output of said inverse filter into a sequence of values from a discrete set. 5 8
11. A high speed data transfer system according to claim 1, further comprising a reverse channel for transmitting information from said subscriber to said source.
12. A high speed data transfer system according to claim 1 wherein said encoder further comprises a source coding means and said decoder further comprises an inverse to said source coding means.
13. A high speed data transfer system according to claim 1, wherein said encoder and said decoder further comprise a pair of matching modems.
14. A high speed data transfer system according to claim 1, wherein said series of codewords represents an image and said reconstructed series of codewords represents a facsimile of said image.
15. A high speed data transfer encoding system comprising: a conversion means for converting a digital data stream into a sequence of values from a discrete set; a compensator for eliminating unwanted components from said sequence; and an interface to a digital telephone network.
16. A high speed data transfer decoding system for recovering a digital data stream from an analog signal comprising: an analog interface to a telephone network to produce an analog input signal: a clock recovery system for recovering an independent clock from said analog input signal; and an equalization means for eliminating unwanted components from said analog input signal to produce an equalized signal; a decision means for forming a stream of digital values from said equalized signal, thereby producing an estimate of said digital data stream.
PCT/US1995/015924 1994-12-09 1995-12-04 High speed communications system for analog subscriber connections WO1996018261A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002182974A CA2182974C (en) 1994-12-09 1995-12-04 High speed communications system for analog subscriber connections
EP95943030A EP0745302B1 (en) 1994-12-09 1995-12-04 High speed communications system for analog subscriber connections
AU44184/96A AU701274B2 (en) 1994-12-09 1995-12-04 High speed communications system for analog subscriber connections
AT95943030T ATE265120T1 (en) 1994-12-09 1995-12-04 FAST SWITCHING SYSTEM FOR ANALOGUE SUBSCRIBER CONNECTIONS
JP51778596A JP4291410B2 (en) 1994-12-09 1995-12-04 High speed data transfer encoder, decoder, system, encoding method and decoding method
DE69532919T DE69532919T2 (en) 1994-12-09 1995-12-04 FAST ARRANGEMENT SYSTEM FOR ANALOG PARTICIPANT CONNECTIONS

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US35265194A 1994-12-09 1994-12-09
US08/352,651 1994-12-09

Publications (3)

Publication Number Publication Date
WO1996018261A2 WO1996018261A2 (en) 1996-06-13
WO1996018261A3 WO1996018261A3 (en) 1996-08-29
WO1996018261B1 true WO1996018261B1 (en) 1996-11-07

Family

ID=23385945

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/015924 WO1996018261A2 (en) 1994-12-09 1995-12-04 High speed communications system for analog subscriber connections

Country Status (12)

Country Link
US (5) US5801695A (en)
EP (1) EP0745302B1 (en)
JP (3) JP4291410B2 (en)
KR (4) KR100422965B1 (en)
AT (1) ATE265120T1 (en)
AU (1) AU701274B2 (en)
CA (3) CA2182974C (en)
DE (1) DE69532919T2 (en)
ES (1) ES2219671T3 (en)
PT (1) PT745302E (en)
TW (1) TW365092B (en)
WO (1) WO1996018261A2 (en)

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