Method for synchronizing video signals
AssigneeSony Deutschland GmbH
InventorsPiergiorgio Sartor, Gil Golov, Altfried Dilly
Life of this patent
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Abstract
A method for synchronizing video signals is provided wherein a synchronization state signal is generated which is descriptive for the synchronization of an output of fields/frames with the respective input of respective fields/frames of an underlying video data screen in particular on the basis of a time difference which is given by respective counted times and/or temporal changes and/or variations thereof.
Claims9
Method for synchronizing video signals, comprising the steps of:
- receiving/providing, processing and outputting a video data stream of field/frame data packets,
- generating an input event each time a field/frame enters and an output event each time a field/frame leaves,
- starting a respective timing or time counting process according to the input event and stopping a same process according to said output event,
- generating a synchronization state signal which is descriptive for the synchronization of the output of fields/frames with the input of fields/frames on the basis of the time difference given by said counted times and/or temporal changes or variations thereof,
- calculating an error value as the time difference between the counted time differences and a wanted time difference, which has previously been set, and
- forwarding the error value to a feedback loop, which is adapted to force the counted time difference close to said wanted time difference.
A device for synchronizing video signals, comprising:
- an input section and an output section respectfully configured to
- receive/provide, process and output a video data stream of field/frame data packets;
- and
- a timer configured to
- generate an input event each time a field/frame enters and an output event each time a field/frame leaves,
- start a respective timing or time counting process according to an occurrence of said input event and stop said process according to an occurrence of said output event, and
- generate a synchronization state signal that is descriptive for the synchronization for the output of fields/frames and with the input of fields/frames on the basis of the time difference between said counted times and/or temporal changes or variations thereof;
- and
- a signal detecting section configured to
- calculate an error value as the time difference between the counted time differences and a wanted time difference, which has previously been set, and
- forward the error value to a feedback loop, which is adapted to force the counted time difference close to said wanted time difference.
A computer program product having computer readable instructions that when executed by a processor perform steps comprising:
- receiving/providing, processing with the processor and outputting a video data stream of field/frame data packets;
- generating an input event each time a field/frame enters and an output event each time a field/frame leaves;
- starting a respective timing or time counting process with a timer according to the input event and stopping a same process according to said output event;
- generating a synchronization state signal which is descriptive for the synchronization of the output of fields/frames with the input of fields/frames on the basis of the time difference given by said counted times and/or temporal changes or variations thereof;
- calculating with the processor an error value as the time difference between the counted time differences and a wanted time difference, which has previously been set;
- and
- forwarding the error value to a feedback loop, which is adapted to force the counted time difference close to said wanted time difference.
Dependencies are inferred from the claim text.