US4049928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-adjusting voice frequency repeater
Assignee: Nortel Networks Ltd
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Filing: 1976-06-30
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Granted: 1977-09-20
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Expires: 1996-06-30
Abstract
Abstract A self-adjusting voice frequency repeater for subscriber loops of varying ohmic resistances utilizing a multiplier-divider arrangement is disclosed.
Inventors
- 👤 Israel Levi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:46
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04M; H04M19/00; H04M19/001; H04M19/006
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A self-adjusting voice-frequency repeater for subscriber loops having ohmic resistances between two predetermined values comprising, in combination: means for dividing a control signal proportional to the loop resistance by a temperature-stable d-c reference signal; multiplying means responsive to the output of the dividing means for multiplying said output by an input signal of said repeater; and buffer means responsive to said multiplying means for providing an output signal of said repeater, whereby a temperature generated error of said multiplying means is substantially cancelled by an opposite, temperature generated error of said dividing means.
Claim 2
Dependent Claim
93 words
A self-adjusting voice-frequency repeater for subscriber loops having ohmic resistances between two predetermined values comprising, in combination: means for dividing a control signal proportional to the loop resistance by a temperature-stable d-c reference signal; multiplying means responsive to the output of the dividing means for multiplying said output by an input signal of said repeater; and buffer means responsive to said multiplying means for providing an output signal of said repeater, whereby a temperature generated error of said multiplying means is substantially cancelled by an opposite, temperature generated error of said dividing means.
Claim 3
Dependent Claim
32 words
The repeater of claim 1, said dividing and said multiplying means being single quadrant devices, and said input signal being superposed on a d-c biasing signal to fall within a single quadrant.
Claim 4
Dependent Claim
23 words
The repeater of claim 2, said dividing and said multiplying means having their error-producing, temperature sensitive transistors on a single common monolithic chip.
Claim 5
Dependent Claim
25 words
The repeater of claim 3, said control signal being a voltage between upper and lower limits, and said reference signal being a single value voltage.
Claim 6
Dependent Claim
20 words
The repeater of claim 4, said single value voltage being equal to said lower limit of said control signal voltage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |