Multi-input television receiver with combined clamping and synch

Television – Synchronization – Sync separation

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Details

340500, H04N 508

Patent

active

054366674

ABSTRACT:
A television receiver embodying the invention includes a plurality of luminance signal sources, each capacitively coupled to an input of a luminance signal selection switch and each capacitor being coupled to a respective clamp circuit with each clamp circuit having a reference voltage input coupled to a common reference voltage source. A sync separator is provided having a first input coupled to receive the output of luminance signal selection switch and a second input coupled to a source of reference potential derived from said reference voltage source. Advantageously, the overall number of clamp circuits is minimized by merging the sync separator circuit with the input signal selection clamping circuit.

REFERENCES:
patent: 3573555 (1971-04-01), Lipnitz
patent: 4081833 (1978-03-01), Akiyama
patent: 4663668 (1987-05-01), Rabii et al.

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