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US4709256A
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US
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Wide screen composite video signal encoder and standard aspect ratio decoder having barst and subcarrier components of different frequencies
Assignee: RCA Corp
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Filing: 1986-03-12
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Granted: 1987-11-24
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Expires: 2006-03-12
Abstract
Abstract A wide screen video signal is encoded for transmission as a composite signal having standard line and field rates and the standard frequency color burst. The signal includes chrominance components modulated on a color subcarrier frequency greater than the standard in proportion to the aspect ratio of the wide screen signal divided by the aspect ratio of the standard. A decoder converts the wide screen signal to a given broadcast standard without component separation or chroma demodulation by time expanding center samples of each active line of the wide screen signal.
Inventors
- 👤 Bernard J. Lechner
- 👤 Kerns H. Powers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:36
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/12; H04N11/14; H04N11/24; H04N11/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
An encoder for producing a wide-screen composite video output signal, comprising: first signal source means for providing a wide-screen video signal in component form including a luminance component, a first chrominance component and a second chrominance component, said components being representative of a wide-screen image having an aspect ratio greater than a standard aspect ratio and having line and field rates conforming to a given broadcast standard; second signal source means for providing a color subcarrier signal having a selected frequency proportional to a standard color subcarrier frequency multiplied by said aspect ratio of said wide-screen image and divided by said standard aspect ratio, said selected frequency also being an odd multiple of one-half said line rate of said given broadcast standard; modulator means responsive to said color subcarrier signal of said second signal source means for modulating said chrominance component signals on respective quadrature related carrier waves; and output means for combining said luminance component and said modulated chrominance components and for inserting a color burst component having a frequency equal to said standard color subcarrier signal to form said wide-screen composite video output signal.
Claim 2
Dependent Claim
186 words
An encoder for producing a wide-screen composite video output signal, comprising: first signal source means for providing a wide-screen video signal in component form including a luminance component, a first chrominance component and a second chrominance component, said components being representative of a wide-screen image having an aspect ratio greater than a standard aspect ratio and having line and field rates conforming to a given broadcast standard; second signal source means for providing a color subcarrier signal having a selected frequency proportional to a standard color subcarrier frequency multiplied by said aspect ratio of said wide-screen image and divided by said standard aspect ratio, said selected frequency also being an odd multiple of one-half said line rate of said given broadcast standard; modulator means responsive to said color subcarrier signal of said second signal source means for modulating said chrominance component signals on respective quadrature related carrier waves; and output means for combining said luminance component and said modulated chrominance components and for inserting a color burst component having a frequency equal to said standard color subcarrier signal to form said wide-screen composite video output signal.
Claim 3
Dependent Claim
162 words
An aspect ratio converter, comprising: input means for receiving a composite video input signal representative of a wide-screen image having an aspect ratio greater than a standard value, said input signal having line and field rates conforming to a given broadcast standard and having a color subcarrier component of a frequency proportional to a standard color subcarrier reference frequency multiplied by said aspect ratio of said wide screen image and divided by said standard aspect ratio, said input signal having a color burst component equal to said standard color subcarrier reference frequency; and circuit means coupled to said input means for time expanding center samples of each active line of said composite video input signal to provide a composite video output signal having an aspect ratio and color subcarrier frequency conforming to said given broadcast standard and wherein: said circuit means includes means for inserting said color burst component in said video output signal without frequency translation of said color burst component.
Claim 4
Dependent Claim
162 words
An aspect ratio converter, comprising: input means for receiving a composite video input signal representative of a wide-screen image having an aspect ratio greater than a standard value, said input signal having line and field rates conforming to a given broadcast standard and having a color subcarrier component of a frequency proportional to a standard color subcarrier reference frequency multiplied by said aspect ratio of said wide screen image and divided by said standard aspect ratio, said input signal having a color burst component equal to said standard color subcarrier reference frequency; and circuit means coupled to said input means for time expanding center samples of each active line of said composite video input signal to provide a composite video output signal having an aspect ratio and color subcarrier frequency conforming to said given broadcast standard and wherein: said circuit means includes means for inserting said color burst component in said video output signal without frequency translation of said color burst component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |