US5809075A
Expired / Lapsed
US
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High speed communications system for analog subscriber connections
Assignee: TOWNSHEND INTELLECTUAL PROPERTY LLC
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Filing: 1997-04-11
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Granted: 1998-09-15
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Expires: 2017-04-11
Abstract
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of the two communication endpoints, the currently-accepted maximum theoretical limits on the data rate are no longer applicable.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. Device for 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.
Inventors
- 👤 Brent Townshend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:40
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/0016; H04L7/002; H04L7/0029; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4927; H04L5/00; H04L5/14; H04L5/1438; H04M; H04M11/00; H04M11/06; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q2213/00; H04Q2213/13034; H04Q2213/13036; H04Q2213/1305; H04Q2213/1309; H04Q2213/13103; H04Q2213/13107; H04Q2213/13174; H04Q2213/13179; H04Q2213/13199; H04Q2213/13202; H04Q2213/13204; H04Q2213/13209; H04Q2213/13299; H04Q2213/1332; H04Q2213/13337; H04Q2213/1336; H04Q2213/13385; H04Q2213/13396
Claims Analysis
Total Claims: 68
Claim 1
Independent Claim
143 words
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; and a decoder coupled by said analog loop to said digital telephone network, wherein said analog loop provides an analog signal to said decoder, which analog signal is an analog representation of said series of codewords, and wherein said decoder is responsive to said analog signal to reconstruct said series of codewords in digital form from said analog signal.
Claim 2
Dependent Claim
143 words
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; and a decoder coupled by said analog loop to said digital telephone network, wherein said analog loop provides an analog signal to said decoder, which analog signal is an analog representation of said series of codewords, and wherein said decoder is responsive to said analog signal to reconstruct said series of codewords in digital form from said analog signal.
Claim 3
Dependent Claim
29 words
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.
Claim 4
Dependent Claim
29 words
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.
Claim 5
Dependent Claim
29 words
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 said series of codewords.
Claim 6
Dependent Claim
44 words
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.
Claim 7
Dependent Claim
60 words
A high speed data transfer system according to claim 5, 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.
Claim 8
Dependent Claim
50 words
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.
Claim 9
Dependent Claim
24 words
A high speed data transfer system according to claim 1, further comprising a reverse channel for transmitting information from said subscriber to said source.
Claim 10
Dependent Claim
24 words
A high speed data transfer system as claimed in claim 8, wherein said reverse channel comprises a demodulator coupled to said digital telephone network.
Claim 11
Dependent Claim
31 words
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.
Claim 12
Dependent Claim
23 words
A high speed data transfer system according to claim 1, wherein said encoder and said decoder further comprise a pair of matching modems.
Claim 13
Dependent Claim
30 words
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.
Claim 14
Dependent Claim
23 words
A high speed data transfer system as claimed in claim 1, wherein said decoder comprises means for reducing distortion in said analog signal.
Claim 15
Dependent Claim
62 words
A high speed data transfer system according to claim 13, 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.
Claim 16
Dependent Claim
22 words
A high speed data transfer system according to claim 14, wherein said conversion from digital to analog includes a non-linear companding circuit.
Claim 17
Dependent Claim
29 words
A high speed data transfer system as claimed in claim 1, wherein a parameter of said decoder is updated using a predetermined data sequence as said series of codewords.
Claim 18
Dependent Claim
27 words
A high speed data transfer system as claimed in claim 1, wherein said decoder further comprises means for extracting said input from said reconstructed series of codewords.
Claim 19
Dependent Claim
30 words
A high speed data transfer system as claimed in claim 17, wherein said input is extracted from said reconstructed series of codewords at a rate in excess of 33 kbps.
Claim 20
Dependent Claim
21 words
A high speed data transfer system as claimed in claim 1, further comprising means for initializing said encoder and said decoder.
Claim 21
Dependent Claim
18 words
A high speed data transfer system as claimed in claim 1, further comprising means for training said decoder.
Claim 22
Dependent Claim
36 words
A high speed data transfer system as claimed in claim 20, wherein said training means comprises means for comparing a predetermined training pattern received by said decoder over said analog loop with a stored training pattern.
Claim 23
Dependent Claim
30 words
A high speed data transfer system as claimed in claim 21, further comprising means for updating a parameter of said decoder, said updating means being responsive to said comparing means.
Claim 24
Dependent Claim
29 words
A high speed data transfer system as claimed in claim 1, wherein said encoder and said interface are incorporated into a relay server coupled to said digital telephone network.
Claim 25
Dependent Claim
26 words
A high speed data transfer system as claimed in claim 23, further comprising a digital subscriber connected to said relay server by said digital telephone network.
Claim 26
Dependent Claim
35 words
A high speed data transfer system as claimed in claim 1, wherein said encoder comprises a server interface having an array of independent encoders coupled between said digital data source and said digital telephone network.
Claim 27
Dependent Claim
19 words
A high speed data transfer system as claimed in claim 1, wherein said quantizer values are μ-law quantizer values.
Claim 28
Dependent Claim
19 words
A high speed data transfer system as claimed in claim 1, wherein said quantizer values are A-law quantizer values.
Claim 29
Dependent Claim
30 words
A high speed data transfer system as claimed in claim 1, wherein said encoder and said decoder further comprise means for compressing said input and means for inverting compression, respectively.
Claim 30
Dependent Claim
30 words
A high speed data transfer system as claimed in claim 1, wherein said set of codewords is restricted to a subset of codewords to improve the accuracy of said decoder.
Claim 31
Dependent Claim
154 words
A high speed data transfer method for a communications system connecting a data source to a subscriber, wherein said subscriber is connected to a digital telephone network by an analog loop and said data source is connected through a digital connection to said digital telephone network, said method comprising the steps of: selecting a subset of digital codewords from a set of digital telephone network codewords, said digital telephone network codewords corresponding to a set of quantization values applied at a line interface which couples said digital telephone network to said analog loop; mapping a data stream produced by said data source into a sequence of digital codewords from said subset of digital codewords; transmitting said sequence of codewords through said digital connection to said digital telephone network; converting said sequence of codewords into an analog signal at said line interface; and at said subscriber, reconstructing said sequence of codewords from said analog signal.
Claim 32
Dependent Claim
154 words
A high speed data transfer method for a communications system connecting a data source to a subscriber, wherein said subscriber is connected to a digital telephone network by an analog loop and said data source is connected through a digital connection to said digital telephone network, said method comprising the steps of: selecting a subset of digital codewords from a set of digital telephone network codewords, said digital telephone network codewords corresponding to a set of quantization values applied at a line interface which couples said digital telephone network to said analog loop; mapping a data stream produced by said data source into a sequence of digital codewords from said subset of digital codewords; transmitting said sequence of codewords through said digital connection to said digital telephone network; converting said sequence of codewords into an analog signal at said line interface; and at said subscriber, reconstructing said sequence of codewords from said analog signal.
Claim 33
Dependent Claim
26 words
A high speed data transfer method as claimed in claim 30, further comprising the step of extracting said data stream from said reconstructed sequence of codewords.
Claim 34
Dependent Claim
31 words
A high speed data transfer method as claimed in claim 31, wherein said data stream is extracted from said reconstructed sequence of codewords at a rate in excess of 33 kbps.
Claim 35
Dependent Claim
35 words
A high speed data transfer method as claimed in claim 32, wherein said step of initializing said communications system comprises the step of repeatedly transmitting a training sequence from said data source to said subscriber.
Claim 36
Dependent Claim
37 words
A high speed data transfer method as claimed in claim 33, wherein the step of initializing said communications system further comprises the step of comparing the training sequence received by said subscriber with a predetermined training sequence.
Claim 37
Dependent Claim
41 words
A high speed data transfer method as claimed in claim 34, further comprising the step of adjusting a parameter of the communications system in accordance with a result of the comparison of the received training sequence to the transmitted training sequence.
Claim 38
Dependent Claim
41 words
A high speed data transfer method as claimed in claim 34, wherein the step of selecting a subset of digital codewords is performed in accordance with a result of the comparison of the received training sequence to the predetermined training sequence.
Claim 39
Dependent Claim
39 words
A high speed data transfer method as claimed in claim 30, further comprising, before the step of converting said data stream produced by said data source into said sequence of digital codewords, the step of initializing said communications system.
Claim 40
Dependent Claim
24 words
A high speed data transfer method as claimed in claim 30, further comprising the step of adjusting a frequency component of said analog signal.
Claim 41
Dependent Claim
26 words
A high speed data transfer method as claimed in claim 38, wherein said adjusting step comprises inserting a compensating codeword into said transmitted sequence of codewords.
Claim 42
Dependent Claim
19 words
A high speed data transfer method as claimed in claim 38, wherein said frequency component is a DC component.
Claim 43
Dependent Claim
23 words
A high speed data transfer method as claimed in claim 30, wherein said step of converting the data stream comprises a serial-to-parallel conversion.
Claim 44
Dependent Claim
27 words
A high speed data transfer method as claimed in claim 30, wherein said sequence of codewords is transmitted at a rate of eight thousand codewords per second.
Claim 45
Dependent Claim
34 words
A high speed data transfer method as claimed in claim 30, wherein the mapping step further comprises the step of inserting a predetermined bit into a least-significant bit position within each of said codewords.
Claim 46
Dependent Claim
36 words
A high speed data transfer method as claimed in claim 43, further comprising the step of extracting said data stream from said reconstructed sequence of codewords, wherein said extracting step comprises disregarding said least-significant bit position.
Claim 47
Dependent Claim
34 words
A high speed data transfer method as claimed in claim 30, further comprising the step of inserting error correction bits into said data stream before mapping said data stream into said sequence of codewords.
Claim 48
Independent Claim
118 words
A method for transferring data between a first party having digital connectivity to a telephone system and an analog subscriber to said telephone system comprising the steps of: encoding digital data at the first party into a sequence of symbols from a set of quantization symbols corresponding to quantizer values utilized by said telephone system and utilized at a line interface connecting a digital portion of said telephone system to said analog subscriber; transmitting said sequence via said telephone system, said transmitting step comprising the step of converting said sequence at said line interface into an analog signal for reception by said subscriber; and at said analog subscriber, decoding the received analog signal to recover said digital data.
Claim 49
Independent Claim
118 words
A method for transferring data between a first party having digital connectivity to a telephone system and an analog subscriber to said telephone system comprising the steps of: encoding digital data at the first party into a sequence of symbols from a set of quantization symbols corresponding to quantizer values utilized by said telephone system and utilized at a line interface connecting a digital portion of said telephone system to said analog subscriber; transmitting said sequence via said telephone system, said transmitting step comprising the step of converting said sequence at said line interface into an analog signal for reception by said subscriber; and at said analog subscriber, decoding the received analog signal to recover said digital data.
Claim 50
Dependent Claim
25 words
A method as claimed in claim 46, further comprising the step of training a decoder located at said subscriber using a predetermined pattern of symbols.
Claim 51
Dependent Claim
24 words
A method as claimed in claim 46, wherein said transmitting step comprises converting said sequence of symbols into a corresponding sequence of analog levels.
Claim 52
Dependent Claim
167 words
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 operatively associated with said digital data source, said encoder converting an input from said data source into a series of codewords from a set of codewords associated with quantizer values determined by said digital telephone network; an interface for transmitting said series of codewords in digital form from said encoder to said digital telephone network; a digital-to-analog converter located at a line interface between said digital telephone network and said analog loop, wherein said converter provides an analog signal to said subscriber over said analog loop, which analog signal is a representation of said series of codewords; and a decoder associated with said subscriber and connected to said analog loop, said decoder being responsive to said analog signal provided to said subscriber by said converter to reconstruct, from said analog signal, said input from said data source.
Claim 53
Dependent Claim
167 words
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 operatively associated with said digital data source, said encoder converting an input from said data source into a series of codewords from a set of codewords associated with quantizer values determined by said digital telephone network; an interface for transmitting said series of codewords in digital form from said encoder to said digital telephone network; a digital-to-analog converter located at a line interface between said digital telephone network and said analog loop, wherein said converter provides an analog signal to said subscriber over said analog loop, which analog signal is a representation of said series of codewords; and a decoder associated with said subscriber and connected to said analog loop, said decoder being responsive to said analog signal provided to said subscriber by said converter to reconstruct, from said analog signal, said input from said data source.
Claim 54
Dependent Claim
30 words
A high speed data transfer system as claimed in claim 49, wherein said digital-to-analog converter comprises a quantizer, said quantizer providing said quantizer values utilized by said digital telephone network.
Claim 55
Dependent Claim
33 words
A high speed data transfer system as claimed in claim 49, wherein said analog signal comprises a sequence of analog levels, each of said analog levels being associated with one of said codewords.
Claim 56
Dependent Claim
156 words
A high speed data transfer system for communicating digital data between data devices connected to a digital telephone network, where a data source is digitally connected to said network and a subscriber is connected via an analog subscriber line to said network, the transfer system comprising: an encoder responsive to said data source, said encoder converting data from said data source into a series of codewords selected from a subset of a set of codewords corresponding to quantizer values utilized by said network, each of said codewords corresponding to an analog level generated by a digital-to-analog converter device within said network; an interface for communicating said series of codewords from said encoder to said network, wherein said digital-to-analog converter converts said series of codewords into an analog signal, which analog signal is coupled to said analog subscriber line; and a decoder responsive to said analog signal to reconstruct said series of codewords from said analog signal.
Claim 57
Dependent Claim
156 words
A high speed data transfer system for communicating digital data between data devices connected to a digital telephone network, where a data source is digitally connected to said network and a subscriber is connected via an analog subscriber line to said network, the transfer system comprising: an encoder responsive to said data source, said encoder converting data from said data source into a series of codewords selected from a subset of a set of codewords corresponding to quantizer values utilized by said network, each of said codewords corresponding to an analog level generated by a digital-to-analog converter device within said network; an interface for communicating said series of codewords from said encoder to said network, wherein said digital-to-analog converter converts said series of codewords into an analog signal, which analog signal is coupled to said analog subscriber line; and a decoder responsive to said analog signal to reconstruct said series of codewords from said analog signal.
Claim 58
Dependent Claim
152 words
A high speed data transfer method for communicating digital data between data devices connected to a digital telephone network, where a data source is digitally connected to said network and a data recipient is connected via an analog subscriber line to said network, said method comprising the steps of: selecting a subset of codewords from a set of codewords corresponding to analog levels generated by a digital-to-analog converter within said network; mapping a data stream produced by said data source into a sequence of digital codewords from said subset of digital codewords corresponding to quantizer values utilized by said network; converting said sequence of codewords into a corresponding sequence of analog levels at said digital-to-analog converter; sending said sequence of analog levels to said data recipient; at said data recipient, reconstructing said sequence of codewords from said sequence of analog levels; and converting said reconstructed sequence of codewords into said data stream.
Claim 59
Dependent Claim
152 words
A high speed data transfer method for communicating digital data between data devices connected to a digital telephone network, where a data source is digitally connected to said network and a data recipient is connected via an analog subscriber line to said network, said method comprising the steps of: selecting a subset of codewords from a set of codewords corresponding to analog levels generated by a digital-to-analog converter within said network; mapping a data stream produced by said data source into a sequence of digital codewords from said subset of digital codewords corresponding to quantizer values utilized by said network; converting said sequence of codewords into a corresponding sequence of analog levels at said digital-to-analog converter; sending said sequence of analog levels to said data recipient; at said data recipient, reconstructing said sequence of codewords from said sequence of analog levels; and converting said reconstructed sequence of codewords into said data stream.
Claim 60
Independent Claim
134 words
A method for transferring digital data from a first party, having digital connectivity to a telephone network, to a second party having analog connectivity to said telephone networks comprising the steps of: encoding digital data at the first party into a sequence of codewords selected from a subset of codewords corresponding to quantizer values utilized by said network and analog levels generated by a digital-to-analog converter device within said network; transmitting said sequence of codewords via said telephone network to a line interface that includes said digital-to-analog converter device, said line interface being coupled to said second party; converting said sequence of codewords into a sequence of analog levels at said line interface; receiving said sequence of analog levels at said second party; recovering said digital data from said received sequence of analog levels.
Claim 61
Independent Claim
134 words
A method for transferring digital data from a first party, having digital connectivity to a telephone network, to a second party having analog connectivity to said telephone networks comprising the steps of: encoding digital data at the first party into a sequence of codewords selected from a subset of codewords corresponding to quantizer values utilized by said network and analog levels generated by a digital-to-analog converter device within said network; transmitting said sequence of codewords via said telephone network to a line interface that includes said digital-to-analog converter device, said line interface being coupled to said second party; converting said sequence of codewords into a sequence of analog levels at said line interface; receiving said sequence of analog levels at said second party; recovering said digital data from said received sequence of analog levels.
Claim 62
Dependent Claim
148 words
A high speed data transfer system for communicating data over a connection, wherein the connection includes an analog subscriber loop that is coupled by a line interface to a digital telephone network, comprising: an encoder coupled to said digital telephone network, wherein said encoder converts an input from a data source into a digital series of codewords, said codewords being selected from a subset of a group of codewords corresponding to quantizer values utilized by said digital network and associated with said line interface, and transmits said digital series of codewords and to said digital telephone network, said digital series of codewords being converted to an analog signal at said line interface; and a decoder coupled to said analog subscriber loop, wherein said decoder receives said analog signal from said line interface over said analog subscriber loop and reconstructs said digital series of codewords from said analog signal.
Claim 63
Dependent Claim
148 words
A high speed data transfer system for communicating data over a connection, wherein the connection includes an analog subscriber loop that is coupled by a line interface to a digital telephone network, comprising: an encoder coupled to said digital telephone network, wherein said encoder converts an input from a data source into a digital series of codewords, said codewords being selected from a subset of a group of codewords corresponding to quantizer values utilized by said digital network and associated with said line interface, and transmits said digital series of codewords and to said digital telephone network, said digital series of codewords being converted to an analog signal at said line interface; and a decoder coupled to said analog subscriber loop, wherein said decoder receives said analog signal from said line interface over said analog subscriber loop and reconstructs said digital series of codewords from said analog signal.
Claim 64
Dependent Claim
137 words
A high speed data transfer method for communicating data over a connection, wherein the connection includes an analog subscriber loop that is coupled by a line interface to a digital telephone network, comprising: encoding an input from a data source into a digital series of codewords, said codewords being selected from a subset of a group of codewords corresponding to quantizer values utilized by said digital network associated with said line interface; transmitting said encoded digital series of codewords over said digital telephone network to said line interface; converting said encoded digital series of codewords into an analog signal at said line interface; transmitting said analog signal over said analog subscriber loop from said line interface; receiving said analog signal from said analog subscriber loop; and reconstructing said digital series of codewords from said received analog signal.
Claim 65
Dependent Claim
137 words
A high speed data transfer method for communicating data over a connection, wherein the connection includes an analog subscriber loop that is coupled by a line interface to a digital telephone network, comprising: encoding an input from a data source into a digital series of codewords, said codewords being selected from a subset of a group of codewords corresponding to quantizer values utilized by said digital network associated with said line interface; transmitting said encoded digital series of codewords over said digital telephone network to said line interface; converting said encoded digital series of codewords into an analog signal at said line interface; transmitting said analog signal over said analog subscriber loop from said line interface; receiving said analog signal from said analog subscriber loop; and reconstructing said digital series of codewords from said received analog signal.
Claim 66
Dependent Claim
31 words
A method as claimed in claim 56, wherein the encoding step comprises modifying said digital series of codewords so as to adjust a frequency component associated with said series of codewords.
Claim 67
Dependent Claim
15 words
A method as claimed in claim 57, wherein said frequency component comprises a DC component.
Claim 68
Dependent Claim
31 words
A method as claimed in claim 58, wherein the step of modifying said digital series of codewords comprises the step of inserting a DC compensating codeword into said series of codewords.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-09-14 | 2002-03-16 | 2002-09-15 | $2000.00 | Window Closed / Lapsed |
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