Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1979-02-09
1981-09-29
Orsino, Jr., Joseph A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
375 27, H04N 712
Patent
active
042926513
ABSTRACT:
The encoding of television signals, to be either processed or transmitted in numerical form, uses a modulation of differential code impulses (PDCM). There is a quantizing characteristic which makes it possible to reduce the numerical flow of signals to be either processed or transmitted. At least partially, the quantizing characteristic is non-symmetrical relative to zero, as far as the number and the values of the thresholds and of the reconstruction difference levels are concerned. Numerical examples are given in the specification. According to a variation of the invention, the quantizing characteristic varies as a function of a prediction value P.sub.n. The prediction zones are not symmetrical relative to the half-dynamic of the prediction P.sub.n. The quantizing characteristics are segments of a wide characteristic which preferably is non-symmetrical.
REFERENCES:
patent: 3151296 (1964-09-01), Phyfe
patent: 3354267 (1967-11-01), Crater
patent: 3403226 (1968-09-01), Wintringham
patent: 3662266 (1972-05-01), Limb et al.
patent: 3707680 (1972-12-01), Gabbard et al.
patent: 3781685 (1973-12-01), Ching
patent: 4093962 (1978-06-01), Ishiguro et al.
patent: 4200886 (1980-04-01), Musmann et al.
Kretz et al.-Degradation des Signaux d'Images et Qualite Subjective en Codage Numerique; Visibilite du Flottement de Contour-Ann. Telecommunic-1976, pp. 1/24-23/24.
Poncin et al.-Systeme de Codage Numerique de l'Image de Television le _Projet OCCITAN-l'Echo des Recherches-Jan. 1976, pp. 28-37.
Von B. Wendland et al.-Ein Adaptiver Intra Frame-Codierer fur Fernsehsignale _Radio Mentor Electronic-1973, p. 737.
Kersten-Experimente zur Nachrichten Reduktion bgi Bildfernsprechsignalen _Int. Elek. Rundschau, 1973, Nr 1, vol. 27, pp. 8-12.
Musmann-Source Encoding with Fixed Word Length and _Synchronous Bit Rate-pp. 27E-1 to 27E-6.
Musmann-A Comparison of Extended Differential Coding _Schemes for Video Signals-1974, Zurich Seminar, pp. CL 1 to 7.
Boudeville Jean-Louis
Kretz Francis
LandOfFree
Expansion and compression of television signals by use of differ does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Expansion and compression of television signals by use of differ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expansion and compression of television signals by use of differ will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1236686