Patent US6330285B1 successfully refreshed from Google Patents.
US6330285B1
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Video clock and framing signal extraction by transport stream “snooping”
Assignee: Arris Technology Inc
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Filing: 1998-02-11
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Granted: 2001-12-11
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Expires: 2018-02-11
Abstract
Abstract An apparatus for video clock and framing signal extraction by transport stream snooping parses MPEG2 Transport Packet headers from a transmission transport stream and partially decodes the headers to identify those corresponding to a specified packet identification (PID). From the specified headers a program clock is decoded and compared with a recovered program clock generated by a local clock oscillator and a local clock counter. The comparison is used to finely tune the recovered program clock frequency. Also from the heads video framing information is decoded, and such framing information and the recovered program clock are used to generate a video reference signal.
Inventors
- 👤 Philip S. Crosby
- 👤 Charles H. Van Dusen
- 👤 Venkataraman Prasannan
- 👤 James L. Gimlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:55
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/60; H04N21/63; H04N21/643; H04N21/64307; H04N19/00; H04N19/60; H04N19/61; H04N21/40; H04N21/43; H04N21/4302; H04N21/4305; H04N21/434; H04N21/4348; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N7/56; H04N19/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
An apparatus for recovering a video clock from a transport stream containing digital data including MPEG Transport Packets without buffering any of the transport stream digital data and without full MPEG decoding comprising: means for extracting MPEG Transport Packet headers from the digital data transport stream; means for partially parsing from the MPEG Transport Packet headers which have a reference packet identification code only a program reference clock and a presentation time stamp; means for comparing the program reference clock with a local clock to generate a recovered program clock; and means for generating from the presentation time stamp and the local clock the video clock.
Claim 2
Independent Claim
106 words
An apparatus for recovering a video clock from a transport stream containing digital data including MPEG Transport Packets without buffering any of the transport stream digital data and without full MPEG decoding comprising: means for extracting MPEG Transport Packet headers from the digital data transport stream; means for partially parsing from the MPEG Transport Packet headers which have a reference packet identification code only a program reference clock and a presentation time stamp; means for comparing the program reference clock with a local clock to generate a recovered program clock; and means for generating from the presentation time stamp and the local clock the video clock.
Claim 3
Dependent Claim
46 words
The apparatus as recited in claim 1 wherein the partially parsing means comprises: means for identifying the MPEG Transport Packet headers having the reference packet identification code; and means for extracting the program reference clock from an appropriate one of the identified MPEG Transport Packet headers.
Claim 4
Dependent Claim
84 words
The apparatus as recited in claim 1 wherein the comparing means comprises: an oscillator operating at a nominal frequency and having a control input, the oscillator providing the local clock as an output; a counter having the local clock as an input and the recovered program clock as an output; and a comparator having the recovered program clock and program reference clock as inputs to generate a control signal that is coupled to the control input of the oscillator to finely tune the oscillator.
Claim 5
Dependent Claim
35 words
The apparatus as recited in claim 3 wherein the generating means comprises a genlock circuit having the local clock signal and the presentation time stamp as inputs and providing the video clock as an output.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-12-10 | 2005-06-11 | 2005-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-12-10 | 2009-06-11 | 2009-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-12-10 | 2013-06-11 | 2013-12-11 | $7700.00 | Window Closed / Lapsed |