US4322749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal generator for television testing
Assignee: British Broadcasting Corp
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Filing: 1980-05-19
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Granted: 1982-03-30
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Expires: 2000-05-19
Abstract
Abstract A television test signal generator generates a test signal comprised of varying sinusoidal components each of which has a phase defined by the equation: φ=k.sub.φ +k.sub.t ·t+k.sub.t 2·(t.sup.2 /2) +k y ·y+k yt ·y·t+k y 2·(y 2 /2) +k x ·x+k xt ·x·t+k xy ·x·y+k x 2·(x 2 /2) The use of more complex terms enables more sophisticated qualities of the television equipment to be gauged. The signal can be generated with the use of appropriate accumulators.
Inventors
- 👤 Martin Weston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:59
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A television test signal generator comprising means for generating television test signals comprising one more periodic waveforms; and means for controlling the phase φ of each of said one or more periodic waveforms in accordance with one or more terms of the following expression: φ=k.sub.φ +k.sub.t ·t+k.sub.t.spsb.2 ·t.sup.2 /2+k.sub.y ·y+k.sub.yt ·y·t+k.sub.y.spsb.2 ·y.sup.2 /2+k.sub.x ·x+k.sub.xt ·x·t+k.sub.xy ·x·y+k.sub.x.spsb.2 ·x.sup.2 /2 wherein x is a horizontal frequency component, y is a vertical frequency component, t is a temporal frequency component, and wherein each of the coefficients k have selectably controlled values, and further wherein the phase φ is not controlled solely in accordance with one or more of the terms k.sub.φ, k t ·t, k y ·y and k x ·x.
Claim 2
Dependent Claim
118 words
A television test signal generator comprising means for generating television test signals comprising one more periodic waveforms; and means for controlling the phase φ of each of said one or more periodic waveforms in accordance with one or more terms of the following expression: φ=k.sub.φ +k.sub.t ·t+k.sub.t.spsb.2 ·t.sup.2 /2+k.sub.y ·y+k.sub.yt ·y·t+k.sub.y.spsb.2 ·y.sup.2 /2+k.sub.x ·x+k.sub.xt ·x·t+k.sub.xy ·x·y+k.sub.x.spsb.2 ·x.sup.2 /2 wherein x is a horizontal frequency component, y is a vertical frequency component, t is a temporal frequency component, and wherein each of the coefficients k have selectably controlled values, and further wherein the phase φ is not controlled solely in accordance with one or more of the terms k.sub.φ, k t ·t, k y ·y and k x ·x.
Claim 3
Dependent Claim
16 words
A generator according to claim 1, in which the phase φ varies at least with time.
Claim 4
Dependent Claim
24 words
A generator according to claim 1, in which the phase φ varies in dependence upon at least two of the cross-product or squared terms.
Claim 5
Dependent Claim
27 words
A generator according to claim 1, wherein said controlling means includes means for permitting the selection of one or more different terms to produce a test signal.
Claim 6
Dependent Claim
24 words
A generator according to claim 1, in which the generating means comprises one or more accumulator means for forming respective ones of the terms.
Claim 7
Dependent Claim
94 words
A generator according to claim 5 wherein each of said accumulator sections comprises adder means responsive to a fixed coefficient value and to an input signal for providing an adder output; register means responsive to said adder output, said adder output being clocked through said register at a selected rate to provide a register signal which is supplied as said input signal to said adder means and as a register output signal representing at least a part of one of said terms which form the phase φ; and means for re-setting said register means.
Claim 8
Dependent Claim
27 words
A generator according to claim 1 wherein said controlling means controls the phase φ at least in accordance with the term k t .spsb.2 ·t 2 /2.
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) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |