US4408227A
Expired / Lapsed
US
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Method and apparatus for television distribution system sweep testing
Assignee: CUSHMAN ELECTRONICS Inc
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Filing: 1981-06-03
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Granted: 1983-10-04
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Expires: 2001-06-03
Abstract
Abstract This invention is a method (and an apparatus in combination) for sweep testing of cable television distribution systems and the like, wherein time division multiplexing between test signal and program signal is accomplished in such manner as to eliminate interference to the program signal due to testing. Additionally, the test signal received by the detector is time demultiplexed in such manner that the test signal is displayed clearly without interfering signals.
Inventors
- 👤 Jack Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:36
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/10; H04N7/102; H04N17/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
Apparatus for testing television distribution networks comprising in combination: a synchronization detector connected to a television distribution network; a test signal generator; means connecting the test signal generator and the synchronization detector to a generator timing and control unit means; means controlled by the generator timing and control unit for periodically suppressing program material; subcarrier generator means controlled by the generator timing and control unit; means for combining the test signal and the subcarrier; means coupling the combined subcarrier and the test signal to the television network; means along the television distribution network at a distance from the test signal generating means suitable to be connected to a test signal detector receiver; a test signal detector receiver connectable to said means to connect; a subcarrier receiver operable with said detector to receiver subcarried signals; data demodulator and synchronization seperator connected to said subcarrier receiver; detector timing and control means connected to said synchronization seperator and data demodulator; and a means connecting said detector receiver and detector timing and control means to a detector display.
Claim 2
Dependent Claim
174 words
Apparatus for testing television distribution networks comprising in combination: a synchronization detector connected to a television distribution network; a test signal generator; means connecting the test signal generator and the synchronization detector to a generator timing and control unit means; means controlled by the generator timing and control unit for periodically suppressing program material; subcarrier generator means controlled by the generator timing and control unit; means for combining the test signal and the subcarrier; means coupling the combined subcarrier and the test signal to the television network; means along the television distribution network at a distance from the test signal generating means suitable to be connected to a test signal detector receiver; a test signal detector receiver connectable to said means to connect; a subcarrier receiver operable with said detector to receiver subcarried signals; data demodulator and synchronization seperator connected to said subcarrier receiver; detector timing and control means connected to said synchronization seperator and data demodulator; and a means connecting said detector receiver and detector timing and control means to a detector display.
References Cited (Backward Citations)
US2885470A
Cited
US4207431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |