Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-02-08
1989-08-22
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358153, H04N 504
Patent
active
048601004
ABSTRACT:
A system which provides synchronization with frame synchronization words of a partially digital signal, such as that of the D2MAC television standard. It is provided that three modes of operation are established sequentially. In a first mode, the values necessary to control the gain and the d.c. level of the television signal are obtained by means of a peak detector (18). Similarly, in a second mode, the peak detector is enabled only during the digital signal periods of the D2MAC signal. Finally, in the third mode, the setting values are obtained by arrangements (13, 8) which depend on the clamp plateau measurement of each line and of line 624. The television signal is converted into a digital signal by an analog/digital converter (6), which, more specifically, feeds the digital arrangement (8) for measuring the picture plateaus; the results of the peak detector measurement (18) are also converted into digital values (17), managing the procedure and the processing of at least a portion of the control signals is effected by a microprocessor (33) and certain control signals are again converted into analog values by a digital/analog converter (10).
REFERENCES:
patent: 4707730 (1987-11-01), Alard
Displacement Measurement and Its Application in Interframe Image Coding, Jain e al; IEEE Transactions on Communications, vol. COM-29, No. 12, Dec. 1981.
TV Bandwidth Compression System by Contour Interpolation, Ando et al., Electronics and Communications in Japan, vol. 49, No. 6, Jun. 1966, pp. 41-49.
Analyse De Structures De Sous-Echantillonnage Spatio-Temporel D'Un Signal TVHD En Vue De Sa Transmission Dans Un Canal Mac, Bernard et al; Colloque TVHD 87.
Couderc Pascal
Lefebvre Serge G.
Rakhodai Issa
Britton Howard W.
Goodman Edward W.
Harvey David E.
U.S. Philips Corporation
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