Encoder and encoding method

The upper limit of the usage range of a VBV buffer is determined in accordance with the predetermined delay time of the VBV buffer and a designated bit rate. The target bit rate of a picture (j) and the data occupancy rate of the VBV when a picture (j+1) is encoded are calculated. The target bit rat...

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Bibliographic Details
Main Author KANJI MIHARA
Format Patent
LanguageEnglish
Published 17.11.1999
Edition6
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:The upper limit of the usage range of a VBV buffer is determined in accordance with the predetermined delay time of the VBV buffer and a designated bit rate. The target bit rate of a picture (j) and the data occupancy rate of the VBV when a picture (j+1) is encoded are calculated. The target bit rate T(j) for encoding the picture (j) is corrected so as to allow the data occupancy rate of the VBV for the picture (j+1) to always fall within the limited range. By this process, even if an encoded bit rate is set low, the delay caused by the VBV buffer exceeding a predetermined delay time does not exceed a prescribed delay time. With this constitution, an MPEG encoder suitable for the live broadcast, etc. which involves a delay time problem can be realized.
Bibliography:Application Number: GB19990017432