EP0795984A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flexible asymmetrical digital subscriber line (ADSL) receiver, central office using same, and method therefor
Assignee: NXP USA Inc
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Filing: 1997-03-05
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Granted: —
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Expires: 2017-03-05
Abstract
Abstract An ADSL receiver (200) receives an upstream modified ADSL signal and an ISDN signal from a remote terminal (32) on a twisted-pair copper wire (18). An ADSL transmitter (100) of the remote terminal (32) transmits the ADSL signal in a frequency range above an ISDN frequency range so that the ADSL signal does not overlap the frequency range of the ISDN signal. In one embodiment, the ADSL receiver (200) includes a band pass filter (201), an analog-to-digital converter (203), a decimator (205), a fast Fourier transform (210), and a digital signal processor (212). The decimator (205) converts the ADSL signal back to base band, thus allowing an ADSL signal source to simultaneously utilize the telephone line with an ISDN signal source, without significantly reducing ADSL throughput. <IMAGE>
Inventors
- 👤 Mathew A. Rybicki
- 👤 Michael R. May
- 👤 Matthew A. Pendleton
- 👤 Terence L. Johnson
- 👤 Peter R. Molnar
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 16:42
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/2601; H04L27/2647; H04L27/2649; H04M; H04M11/00; H04M11/06; H04M11/062; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04B; H04B3/00; H04B3/02; H04Q2213/00; H04Q2213/13034; H04Q2213/13107; H04Q2213/1313; H04Q2213/1319; H04Q2213/13199; H04Q2213/13209; H04Q2213/13376; H04Q2213/13396
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
An ADSL receiver (200, 220, 240, 250), comprising: a band pass filter (201, 221, 241, 251) having an input for receiving an analog ADSL signal, and output; an analog-to-digital converter (203, 223, 241, 251) having an input coupled to the output of the band pass filter (201, 221, 241, 251), and an output for providing a digital signal representative of the analog ADSL signal; a decimator (205, 227) having an input coupled to the output of the analog-to-digital converter, and an output; a time-to-frequency converter (210, 233, 247, 257) having an input coupled to the output of the decimator (205, 227), and an output; and a digital signal processor (212, 233, 248, 258) having an input coupled to the output of the time-to-frequency converter (210, 233, 247, 257), and an output for providing decoded digital data.
Claim 2
Dependent Claim
60 words
The ADSL receiver (200, 220, 240, 250) of claim 1, wherein the decimator (205) comprises: an ISDN filter (206) having an input coupled to the output of the analog-to-digital converter (203), and an output; and a down sampler (208) having an input coupled to the output of the ISDN filter (206), and an output coupled to the time-to-frequency converter (210).
Claim 3
Dependent Claim
33 words
The ADSL receiver (200, 220, 240, 250) of claim 1, wherein the band pass filter (201, 221, 241, 251) substantially removes signal frequencies outside of a band from about 138kHz to 276 KHz.
Claim 4
Dependent Claim
29 words
The ADSL receiver (200, 220, 240, 250) of claim 1, wherein the analog-to-digital converter (203, 223, 241, 251) produces a word rate of about 552 kilo words per second.
Claim 5
Dependent Claim
175 words
An ADSL receiver (220), comprising: a band pass filter (221) having an input for receiving an analog ADSL signal, and output; an analog-to-digital converter (223) having an input coupled to the output of the band pass filter (221), and an output for providing a digital signal representative of the analog ADSL signal; a multiplier (225) having a first input coupled to the output of the analog-to-digital converter (223), a second input for receiving a mixing signal, and an output for providing a frequency folded signal; a decimator (227) having an input coupled to the output of the analog-to-digital converter (223) for receiving the frequency folded signal, and an output for providing a decimated signal; a time-to-frequency converter (232) having an input coupled to the output of the decimator (227) for receiving the decimated signal, and an output for providing a frequency domain signal; and a digital signal processor (233) having an input coupled to the output of the time-to-frequency converter (232) for receiving the frequency domain signal, and an output for providing decoded digital data.
Claim 6
Dependent Claim
122 words
A central office terminal for connection to a telephone line (18), comprising: a first terminal (40) coupled to an asymmetric digital subscriber line (ADSL) signal source having a first frequency content; a second terminal (46) coupled to a second signal source having a second frequency content, wherein the frequencies of the first and second frequency contents do not overlap; and a receiver (200, 220, 240, 250) circuit coupled to said first terminal (40), wherein the receiver circuit (200, 220, 240, 250) receives the first and second frequency contents, substantially removes the second frequency content, and decodes the first frequency content to provide decoded digital data; wherein said ADSL signal source and said second signal source may simultaneously utilize the telephone line (18).
Claim 7
Independent Claim
81 words
A method for decoding an analog ADSL signal, comprising the steps of: band pass filtering the analog ADSL signal to provide a filtered analog ADSL signal; converting the filtered analog ADSL signal to a digital data signal representative of the analog ADSL signal; decimating the digital data signal to produce a decimated digital data signal; converting the decimated digital data signal to a frequency domain digital data signal; and decoding the frequency domain digital data signal to provide decoded digital data.
Claim 8
Independent Claim
97 words
A method for decoding an analog ADSL signal, comprising the steps of: band pass filtering the analog ADSL signal; converting the analog ADSL signal to a digital ADSL signal; mixing the digital ADSL signal with a mixing signal to produce a frequency folded digital ADSL signal; decimating the frequency folded digital ADSL signal to produce a decimated frequency folded digital ADSL signal; converting the decimated frequency folded digital ADSL signal to a frequency domain decimated frequency folded digital ADSL signal; and decoding the frequency domain decimated frequency folded digital ADSL signal to produce a decoded digital data.
References Cited (Backward Citations)
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