Television – Synchronization – Sync generation
Patent
1997-05-08
1999-12-07
Kostak, Victor R.
Television
Synchronization
Sync generation
348540, H04N 506
Patent
active
059992212
ABSTRACT:
A horizontal synchronization pulse generation circuit generates a horizontal synchronization pulse to be added to an encoded composite video signal. An input receiving circuit receives an encoded input video signal representing video information received from input video signals. An output video signal represents the encoded input video signal in all portions of the signal except the horizontal synchronization period. During the horizontal synchronization period a current is switched through a path resistor and used to generate the voltage level of the horizontal synchronization pulse. The voltage drop across the path resistor during the horizontal synchronization period is applied directly to the output video signal thereby generating a horizontal synchronization pulse. The current switched through the path resistor is generated by a voltage drop across a current resistor. The ratio of the path resistor to the current resistor is matched, allowing the required signal accuracy to be achieved in the voltage drop across the path resistor and generating the appropriate voltage drop across the path resistor according to the current flowing through the current resistor. The horizontal synchronization pulse generation circuit does not clamp the voltage level of the encoded input video signal, but instead generates the horizontal synchronization pulse in reference to the level of the encoded video signal.
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Nayebi Mehrdad
Ngo Duc
Kostak Victor R.
Sony Corporation
Sony Electronics Inc.
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