Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-11-10
1990-06-19
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 12, 358141, 358138, H04N 712
Patent
active
049358120
ABSTRACT:
For broadcasting an HDTV picture over a transmission channel having a frequency band narrower than that necessary for direct transmission of the HD TV picture, the HDTV source picture is sub-sampled at an analysis image frequency f.sub.o for distributing the spatial data of each HDTV image of the source picture over n successive frames, n being greater than 1. The resulting samples are subjected to temporal energy attenuating filtering in a frequency range around fO
to obtain a modified signal, which is sent over the transmission channel. Upon reception, the modified signal is subjected to temporal filtering for enhancing energy in the frequency range before subjecting it to decoding for restoring the HDTV picture.
REFERENCES:
patent: 4561012 (1985-12-01), Acampora
patent: 4621286 (1986-11-01), Reitmeier et al.
patent: 4723157 (1988-02-01), Wendland et al.
patent: 4785348 (1988-11-01), Funsalas et al.
"Analyse et Structures de Sous-Echantillonnage Spatio-Temporel d'un Signal HDTV en vue de sa Transmission dans Canal MAC" HDTV Conference in Ottawa, Canada, Oct. '87.
Etat Francais
Groody James J.
Kostak Victor R.
Telediffusion de France
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