Patent US5602912A successfully refreshed from Google Patents.
US5602912A
Expired / Lapsed
US
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Telephone hybrid circuit
Assignee: Maxim Integrated Products Inc
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Filing: 1996-01-17
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Granted: 1997-02-11
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Expires: 2016-01-17
Abstract
Abstract A method and apparatus for providing a telephone hybrid function is provided. The present invention maximizes dynamic range while providing a receive signal without interference from a transmit signal. The present invention also provides single-ended to differential conversion. The present invention may be practiced with an integrated circuit powered by a telephone line and coupled to the telephone line without the need for a high voltage isolation barrier between the integrated circuit and the telephone line.
Inventors
- 👤 Russell A. Hershbarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:21
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/58; H04M1/585; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H04B1/58; H04B1/586
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
A method for providing a telephone hybrid function comprising the steps of: connecting a first input of a telephone hybrid function means for providing a telephone hybrid function to a first telephone line conductor; connecting ground of said telephone hybrid function means to a second telephone line conductor, isolating ground of said telephone hybrid function means from earth ground; receiving a telephone line signal at said first input of said telephone hybrid function means, said telephone line signal comprising a first transmit signal and a receive signal; receiving a second transmit signal at a second input of said telephone hybrid function means; highpass filtering said telephone line signal; highpass filtering said second transmit signal; converting said receive signal to a differential receive signal, using a converting means; canceling said first and second transmit signals using a canceling means, to prevent said first and second transmit signals from being outputted; outputting said differential receive signal, without outputting said first and second transmit signals.
Claim 2
Independent Claim
162 words
A method for providing a telephone hybrid function comprising the steps of: connecting a first input of a telephone hybrid function means for providing a telephone hybrid function to a first telephone line conductor; connecting ground of said telephone hybrid function means to a second telephone line conductor, isolating ground of said telephone hybrid function means from earth ground; receiving a telephone line signal at said first input of said telephone hybrid function means, said telephone line signal comprising a first transmit signal and a receive signal; receiving a second transmit signal at a second input of said telephone hybrid function means; highpass filtering said telephone line signal; highpass filtering said second transmit signal; converting said receive signal to a differential receive signal, using a converting means; canceling said first and second transmit signals using a canceling means, to prevent said first and second transmit signals from being outputted; outputting said differential receive signal, without outputting said first and second transmit signals.
Claim 3
Dependent Claim
19 words
The method of claim 1 further including the step of balancing said differential receive signal about a reference voltage.
Claim 4
Dependent Claim
52 words
The method of claim 1 wherein said step of highpass filtering said telephone line signal comprises the steps of: passing a telephone line signal AC component from said first input to said converting means; and blocking a telephone line signal DC component from passing from said first input to said converting means.
Claim 5
Dependent Claim
50 words
The method of claim 3 wherein said step of highpass filtering said second transmit signal comprises the steps of: passing a second transmit signal AC component from said second input to said converting means; and blocking a second transmit signal DC component from said second input to said converting means.
Claim 6
Dependent Claim
192 words
A hybrid circuit comprising: a first input, a second input, and an output; a first telephone line conductor coupled to said first input, said telephone line conductor carrying a first transmit signal and a receive signal; a node coupled to said second input, said node carrying a second transmit signal; a converting means for converting said receive signal to a differential receive signal, said converting means having a first input coupled to said first input of said hybrid circuit, said converting means having a second input coupled to said second input of said hybrid circuit, and said converting means having a differential output coupled to said output of said hybrid circuit; a canceling means for canceling said first transmit signal and said second transmit signal, said canceling means having a first input coupled to said first input of said hybrid circuit, said canceling means having a second input coupled to said second input of said hybrid circuit, and said canceling means having a differential output coupled to said output of said hybrid circuit; said output, of said hybrid circuit, providing said differential receive signal without providing said first and second transmit signals.
Claim 7
Dependent Claim
192 words
A hybrid circuit comprising: a first input, a second input, and an output; a first telephone line conductor coupled to said first input, said telephone line conductor carrying a first transmit signal and a receive signal; a node coupled to said second input, said node carrying a second transmit signal; a converting means for converting said receive signal to a differential receive signal, said converting means having a first input coupled to said first input of said hybrid circuit, said converting means having a second input coupled to said second input of said hybrid circuit, and said converting means having a differential output coupled to said output of said hybrid circuit; a canceling means for canceling said first transmit signal and said second transmit signal, said canceling means having a first input coupled to said first input of said hybrid circuit, said canceling means having a second input coupled to said second input of said hybrid circuit, and said canceling means having a differential output coupled to said output of said hybrid circuit; said output, of said hybrid circuit, providing said differential receive signal without providing said first and second transmit signals.
Claim 8
Dependent Claim
33 words
The hybrid circuit of claim 5 further comprising: a second telephone line conductor, said second telephone line conductor being connected to ground of said hybrid circuit, isolating said hybrid circuit from earth ground.
Claim 9
Dependent Claim
17 words
The hybrid circuit of claim 6 wherein said differential receive signal is balanced about a reference voltage.
Claim 10
Dependent Claim
90 words
The hybrid circuit of claim 7 wherein said canceling means comprises: an operational amplifier, said operational amplifier having a first operational amplifier input, a second operational amplifier input, a first operational amplifier output, and a second operational amplifier output; a first resistor, said first resistor being connected between said first operational amplifier input, and said first operational amplifier output; a second resistor, said second resistor being connected between said first operational amplifier input, and said second operational amplifier output; said second operational amplifier input being connected to a reference voltage.
References Cited (Backward Citations)
US3855430A
Cited
US4034166A
Cited
US4192978A
Cited
US4284859A
Cited
US4433215A
Cited
US4485277A
Cited
US4500755A
Cited
US4600811A
Cited
JPS6032496A
Cited
US4914693A
Cited
US4961219A
Cited
US5068621A
Cited
US5202919A
Cited
US5479504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |