US3597530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for producing pal-color television test signals
Assignee: US Philips Corp
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Filing: 1968-10-28
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Granted: 1971-08-03
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Expires: 1988-10-28
Abstract
Abstract A test circuit for a PAL-TV receiver features a source of PALtest signals which are gated every other line. From frame to frame the gated lines are alternated between the odd and even numbered lines. The resultant signals are applied to the receiver where any misadjustment errors result in the ''''Venetian Blind'''' effect.
Inventors
- 👤 Waldemar Hartwich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:43
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045; H04N17/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
133 words
A test circuit for a televisiOn receiver having selected horizontal and vertical scanning frequencies comprising a source of color television chrominance signals, said signals having two quadrature components one of which alternates in phase at the horizontal frequency; a gate having an input coupled to said source, an output, and a control terminal; means for gating said color television signal every other line and changing the order of gating between adjacent frames including a gated inverter circuit having an output coupled to said gate control terminal, an input coupled to receive a switching signal having a frequency of half the horizontal scan frequency, and a control terminal coupled to receive a switching signal of one quarter of the vertical scan frequency; and means for applying the output of said gate to said receiver.
Claim 2
Dependent Claim
133 words
A test circuit for a televisiOn receiver having selected horizontal and vertical scanning frequencies comprising a source of color television chrominance signals, said signals having two quadrature components one of which alternates in phase at the horizontal frequency; a gate having an input coupled to said source, an output, and a control terminal; means for gating said color television signal every other line and changing the order of gating between adjacent frames including a gated inverter circuit having an output coupled to said gate control terminal, an input coupled to receive a switching signal having a frequency of half the horizontal scan frequency, and a control terminal coupled to receive a switching signal of one quarter of the vertical scan frequency; and means for applying the output of said gate to said receiver.
Claim 3
Dependent Claim
28 words
A circuit as claimed in claim 1 wherein said applying means comprises a combining circuit and further comprising a source of burst signals coupled to said combining circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |