Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-05-13
1977-05-10
Hubler, Malcolm F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
178DIG13, H04N 144
Patent
active
040229726
ABSTRACT:
Due to unavoidable timing and slope errors in the leading and trailing edges of invert pulses utilized in encoding and decoding of the television signal by inversion of the picture signal portion relative to the synchronizing signal portion, transients are generated. A clamping circuit clamps the television signal to a predetermined reference level for short time intervals around each desired switching time instant. The time intervals are sufficiently long to include the maximum possible variation in the actual timing of the switching time instants. A grey level is thus inserted at the encoder. At the decoder, a clamping circuit clamps the television signal to ground potential during the grey level intervals thereby balancing the DC components of the signal portions.
REFERENCES:
patent: 3439113 (1969-04-01), Walker
patent: 3440338 (1969-04-01), Walker
patent: 3460161 (1969-08-01), Waller et al.
patent: 3478166 (1969-11-01), Reiter et al.
patent: 3801732 (1974-04-01), Reeves
patent: 3824332 (1974-07-01), Horowitz
patent: 3919462 (1975-11-01), Hartung et al.
Buczinski S. C.
Hubler Malcolm F.
Rich Marianne
Teleglobe Pay TV System Inc.
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