Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-09-14
1986-12-09
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 14, 358 27, 358318, H04N 1104, H04N 968
Patent
active
046283455
ABSTRACT:
An analog digital conversion is provided for two color difference signals, for example for a recording according to a timeplex method. The color difference signals are adjusted in their amplitude at the input of the analog digital converter such that the modulation range of the analog digital converter is always fully used independent of the original amplitude of the color difference signal. The amplitude is restored back to its original value after a digital to analog reconversion. This results in an improvement of the signal to noise ratio during the transmission. The amplification provided to the various signals can be controlled by comparator circuits comparing the signal level with a reference signal.
REFERENCES:
patent: 3781463 (1973-12-01), Van den Bussche
patent: 4063290 (1977-12-01), Metildi et al.
patent: 4163248 (1979-07-01), Hertmann
patent: 4251802 (1981-02-01), Horna
patent: 4356506 (1982-10-01), Yamamitsu
patent: 4388638 (1983-06-01), Dischert et al.
patent: 4459613 (1984-07-01), Faroudju
patent: 4556900 (1985-12-01), Willis
Geiger Erich
Kaaden Jurgen
Otto Bernhard
Deutsche Thomson-Brandt GmbH
Kasper Horst M.
Shepperd John W.
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