Method and apparatus for DC restoration using feedback
AssigneeRGB Systems, Inc.
InventorsRaymond William Hall, Donald E Parreco
Life of this patent
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Abstract
A feedback circuit for restoration of DC in electrical signals is presented. A sample pulse representing a DC portion of an electrical signal is generated. The sample pulse triggers a sample and hold circuit to acquire the correct offset voltage in the electrical signal during this DC portion. The offset voltage feeds back through a summing node to the electrical signal thereby restoring the video signal to the desired DC voltage level with respect to ground.
Claims12
A feedback circuit for compensating for DC offset in an electrical signal comprising:
- a detection circuit for detecting a first DC portion of said electrical signal
- a sampling circuit configured to sample said first DC portion of said electrical signal to obtain a DC offset value;
- a compensation circuit for applying an inverse of said DC offset value to said electrical signal;
- wherein said detection circuit comprises first and second pulse detectors.
A method for compensating for DC offset in an electrical signal comprising:
- detecting a first DC portion of said electrical signal;
- sampling the first DC portion of said electrical signal to obtain a DC offset value;
- subtracting said DC offset value from said electrical signal;
- wherein said step of detecting said first DC portion of said electrical signal comprises detecting first and second pulses of said electrical signal.
Dependencies are inferred from the claim text.