US4060832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digit rate reducing method in video signal transmission
Assignee: Societe Anonyme de Telecommunications SAT
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Filing: 1976-06-23
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Granted: 1977-11-29
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Expires: 1996-06-23
Abstract
Abstract A digit rate reducing method in the transmission of video-telephone signals, wherein each frame is scanned by means of two consecutive fields comprising each the lines of same parity, each frame dot being represented by a word of n, in particular 3, binary digits comprising transmitting a frame every three frames, storing a frame of each parity at the receiving equipment in a frame storage device, systematically freshening-up a stored frame by the next transmitted frame of same parity, and regenerating intermediate frames by interpolating between the stored frames, further comprising forming a pseudo-field I n with opposite parity to a stored field T n by interpolating between T n and the stored field T n+3 or T n-3 , and regenerating an intermediate field T n+1 or T n-1 from I n and T n+3 or T n-3 , respectively.
Inventors
- 👤 Daniel Pierre Yvon Devimeux
- 👤 Francois-Xavier Antoine Stouls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:51
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/587; H04N19/59
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A digit rate reducing method in the transmission of video-telephone signals, wherein each frame is scanned by means of two consecutive fields comprising each the lines of same parity, each frame dot being represented by a word of n, in particular 3, binary digits comprising transmitting a frame every three frames, storing a frame of each parity at the receiving equipment in a frame storage device, systematicaly freshening-up a stored frame by the next transmitted frame of same parity, and regenerating intermediate frames by interpolating between the stored frames, further comprising forming a pseudo-field I n with opposite parity to a stored field T n by interpolating between T n and the stored field T n+3 or T -3 , and regenerating an intermediate field T n+1 or T n-1 from I n and T n+3 or T n-3 , respectively.
Claim 2
Dependent Claim
141 words
A digit rate reducing method in the transmission of video-telephone signals, wherein each frame is scanned by means of two consecutive fields comprising each the lines of same parity, each frame dot being represented by a word of n, in particular 3, binary digits comprising transmitting a frame every three frames, storing a frame of each parity at the receiving equipment in a frame storage device, systematicaly freshening-up a stored frame by the next transmitted frame of same parity, and regenerating intermediate frames by interpolating between the stored frames, further comprising forming a pseudo-field I n with opposite parity to a stored field T n by interpolating between T n and the stored field T n+3 or T -3 , and regenerating an intermediate field T n+1 or T n-1 from I n and T n+3 or T n-3 , respectively.
Claim 3
Dependent Claim
103 words
A method according to claim 1 wherein for the calculation of a dot X of pseudo-field I n , dot B of field T n+3 or T n-3 corresponding to dot X is compared to dot A and C belonging to adjacent lines of field T n which are nearest to dot B, and wherein either the value of dot B when comprised between the values of dots A and C, or the value of A or C which is nearest to that of dot B when the latter greater or smaller than the values or A and C, is chosen for X.
Claim 4
Dependent Claim
32 words
The method according to claim 1, wherein in order to obtain the intermediate field T n+1 or T n-1 , one forms 1/3 (2I n + T n+3 or T n-3 ).
Claim 5
Dependent Claim
33 words
The method according to claim 2, wherein in order to obtain the intermediate field T n30 1 or T n-1 , one forms 1/3 (2I n + T n+3 or T n-3 ).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |