The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Aug. 25, 2000
Nicholas Ian Saunders, Basingstoke, GB;
Robert Mark Stefan Porter, Maidenhead, GB;
James Edward Burns, Basingstoke, GB;
Sony United Kingdom Limited, Weybridge, GB;
Abstract
Decoders A and B decode MPEG-2 bitstreams A and B and re-encoders and re-encode them as bitstreams A and B comprising only I frames. A switch (S1) switches from recoded stream A to recoded stream B to achieve a splice A /B . The spliced bitstream is stored in an I-frame store ( ). The stored bitstream A /B is re-encoded in an encoder . A new transitional GOP is defined beginning at the splice. The new GOP is defined by picture type decision rules which may change the length of the transitional GOP compared to the GOPs of streams A and B. The transitional GOP provides a prediction of the position in stream B where the occupancy value of stream C should coincide with that of B. A target for the new number of bits in the new GOP is calculated dependent on the difference between the occupancy value of stream C at the splice and a prediction of the occupancy of stream B at the predicted position. The occupancy value of stream C is controlled in accordance with the target so that it tends towards the occupancy value of stream B at the predicted position. In another version, the target is updated at regular intervals throughout the GOP, and the change allowed is limited.