BUFFER MECHANISM, TARGET SYSTEM DECODER AND METHOD FOR BUFFERING DATA

摘要

PROBLEM TO BE SOLVED: To control feeding of data in a way of synchronizing presentation without causing data overflow and underflow in a digital television receiver. SOLUTION: A digital television receiver integrates a data basic buffer 58 to limit occurrence of under flow and overflow in order to control a data flow relating to an auxiliary data service to be presented synchronously with a video or audio program element. The data basic buffer 58 warrants reception of data within a prescribed time to conduct decoding and presentation synchronously with the video or audio program element. The data basic buffer 58 limits also a data quantity of the receiver required for caching data. A minimum capacity of the data basic buffer 58 is selected to be thrice the capacity of a nominal data access unit or thrice the data quantity received by the receiver at a maximum rate within a time when the receiver displays the video element.