Method and device for detecting the parity of successive fields of an interlaced video signal
AssigneeSTMicroelectronics S.r.l.
InventorsDiego Coste, Ilija Materic, François Besson, Hervé Maffini
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Abstract
Successive values of a horizontal phase of a video signal are determined a predetermined integer number of video lines after the successive occurrences of vertical synchronization pulses. The successive values of a parity bit are updated according to the successive values of the horizontal phase. Indications on the parity of the fields are provided from the successive values of the parity bit.
Claims27
A method for detecting parity of successive fields of an interlaced video signal comprising:
- determining successive values of a horizontal phase of the interlaced video signal at a predetermined integer number of video lines after successive occurrences of vertical synchronization pulses;
- updating successive values of a parity bit according to the successive values of the horizontal phase;
- and
- providing indications on the parity of the successive fields of the interlaced video signal from the updated successive values of the parity bit.
A method for operating a video circuit comprising:
- converting an interlaced analog video signal to an interlaced digital video signal;
- horizontally synchronizing a reference signal with the interlaced digital video signal;
- generating vertical synchronization pulses based upon the interlaced digital video signal;
- detecting parity of successive fields of the interlaced digital video signal by
- determining successive values of a horizontal phase of the interlaced digital video signal at a predetermined integer number of video lines after successive occurrences of vertical synchronization pulses,
- updating successive values of a parity bit according to the successive values of the horizontal phase, and
- providing indications on the parity of the successive fields of the interlaced digital video signal from the updated successive values of the parity bit.
A device for detecting parity of successive fields of an interlaced video signal, the device comprising:
- determination means for determining successive values of a horizontal phase of the interlaced video signal at a predetermined integer number of video lines after successive occurrences of vertical synchronization pulses;
- updating means connected to said determination means for updating successive values of a parity bit according to the successive values of the horizontal phase;
- and
- processing means connected to said updating means for providing indications on the parity of the successive fields of the interlaced video signal from the updated successive values of the parity bit.
A video circuit comprising:
- a detection device for detecting parity of
- successive fields of an interlaced video signal, said detection device comprising
- a determination circuit for determining successive values of a horizontal phase of the interlaced video signal at a predetermined integer number of video lines after successive occurrences of vertical synchronization pulses,
- an updating circuit connected to said determination circuit for updating successive values of a parity bit according to the successive values of the horizontal phase, and
- a processing circuit connected to said updating circuit for providing indications on the parity of the successive fields of the interlaced video signal from the updated successive values of the parity bit.
Dependencies are inferred from the claim text.