US3586755A
Expired / Lapsed
US
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Test signal generator
Assignee: RCA Corp
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Filing: 1968-01-30
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Granted: 1971-06-22
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Expires: 1988-01-30
Abstract
Abstract Test signal generating apparatus for providing color bars, dots, lines and crosshatch patterns for television receiver servicing. Color bars are produced by means of an internally generated color subcarrier offset from the standard broadcast color subcarrier by the line scanning frequency employed in the generator. Dots, vertical lines, horizontal lines and a crosshatch pattern are provided by means of pulse trains having pulse repetition rates integrally related to each other and to the line and field rates employed in the generator.
Inventors
- 👤 Steven Wlasuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/04; H04N17/045
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
126 words
A signal generator for supplying test signals for television receivers comprising a first reference signal generator for producing a plurality of periodic waveforms, each of said waveforms being characterized by a frequency which is an integral multiple of the frequency of each lower frequency one of said plurality of waveforms and is an integral submultiple of the frequency of each higher frequency one of said plurality of waveforms, means for selecting and combining predetermined ones of said plurality of waveforms to produce a composite waveform including television line and field synchronizing components having integrally related frequencies wherein said line frequency is an integral multiple of said field frequency, and means coupled to said combining means for supplying said composite waveform to a television receiver under test.
Claim 2
Dependent Claim
126 words
A signal generator for supplying test signals for television receivers comprising a first reference signal generator for producing a plurality of periodic waveforms, each of said waveforms being characterized by a frequency which is an integral multiple of the frequency of each lower frequency one of said plurality of waveforms and is an integral submultiple of the frequency of each higher frequency one of said plurality of waveforms, means for selecting and combining predetermined ones of said plurality of waveforms to produce a composite waveform including television line and field synchronizing components having integrally related frequencies wherein said line frequency is an integral multiple of said field frequency, and means coupled to said combining means for supplying said composite waveform to a television receiver under test.
Claim 3
Dependent Claim
35 words
A signal generator according to claim 1 wherein said plurality of waveforms are produced in synchronism with said first waveform and the frequencies of each of said plurality are integrally related to said first frequency.
Claim 4
Dependent Claim
42 words
A signal generator according to claim 2 and further comprising signal processing means for selectively combining said first and selected ones of said plurality of periodic waveforms to add video components to said composite waveform including television line and field synchronizing components.
Claim 5
Dependent Claim
57 words
A signal generator according to claim 3 wherein said means coupled to said first reference signal generator comprises means for producing a line synchronizing pulse waveform and means for producing a field synchronizing pulse waveform wherein the repetition rate of said field synchronizing pulses is an integral submultiple of the repetition rate of said line synchronizing pulses.
Claim 6
Dependent Claim
73 words
A signal generator according to claim 4 wherein said means coupled to said first reference signal generator further comprises means for producing a fourth pulse waveform characterized by a repetition rate intermediate and integrally related to said line and field synchronizing pulse repetition rates, and means for coupling said fourth pulse waveform to said signal processing means to provide a video pattern on a receiver under test characterized by a horizontal line pattern.
Claim 7
Dependent Claim
37 words
A signal generator according to claim 5 and further comprising amplitude selective means coupled to said signal processing means for producing from said first and fourth waveforms a video pattern of dots on a receiver under test.
Claim 8
Dependent Claim
72 words
A signal generator according to claim 3 and further comprising a second reference signal generator for producing a second periodic waveform at a second frequency equal to the difference between a standard broadcast color subcarrier reference frequency and the frequency of line synchronizing pulses included in said composite waveform, and keying means coupled to said first and second reference signal generators for producing a color bar video component for said composite waveform.
Claim 9
Dependent Claim
121 words
A signal generator for supplying test signals for television receivers comprising a first reference signal oscillator for producing a first periodic waveform at a first frequency, a single pulse divider chain coupled to said oscillator comprising a plurality of serially coupled integral pulse counters, signal combining means coupled to said pulse divider chain for providing television line and field synchronizing pulse waveforms having pulse repetition rates integrally related to each other and to said first frequency such that said line frequency is an integral multiple of said field frequency, and means selectively coupled to said oscillator and to said signal combining means for supplying to a television receiver under test a composite waveform including said line and field synchronizing pulse waveforms.
Claim 10
Dependent Claim
121 words
A signal generator for supplying test signals for television receivers comprising a first reference signal oscillator for producing a first periodic waveform at a first frequency, a single pulse divider chain coupled to said oscillator comprising a plurality of serially coupled integral pulse counters, signal combining means coupled to said pulse divider chain for providing television line and field synchronizing pulse waveforms having pulse repetition rates integrally related to each other and to said first frequency such that said line frequency is an integral multiple of said field frequency, and means selectively coupled to said oscillator and to said signal combining means for supplying to a television receiver under test a composite waveform including said line and field synchronizing pulse waveforms.
Claim 11
Dependent Claim
38 words
A signal generator according to claim 8 wherein said first frequency is an integral multiple of the pulse repetition rate of said line synchronizing pulse waveform and said pulse counters operate in time synchronism with said first oscillator.
Claim 12
Dependent Claim
79 words
A signal generator according to claim 9 wherein said pulse divider chain comprises a first counter for providing a waveform having a repetition rate equal to a desired line synchronizing pulse repetition rate, a second counter for providing a waveform having a repetition rate equal to a desired field synchronizing pulse repetition rate and a third counter for providing a waveform having a repetition rate intermediate but integrally related to both said line and field synchronizing pulse repetition rates.
Claim 13
Dependent Claim
32 words
A signal generator according to claim 10 and further comprising a signal processing amplifier selectively coupled to said first oscillator and said third counter for providing video components for said composite waveform.
Claim 14
Dependent Claim
74 words
A signal generator according to claim 9 and further comprising a second reference signal oscillator for producing an offset color subcarrier waveform at a frequency equal to the difference between a standard broadcast color subcarrier reference frequency and the repetition rate of line synchronizing pulses included in said composite waveform, and a color subcarrier keying stage coupled to said first and second oscillators for producing a color bar video component for said composite waveform.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |