Apparatus and method for controlling buffer data level in receiver of data communication system, and apparatus and method for playing streaming data with adaptive clock synchronizer

At the receiver of a data communication system having a buffer data size adjustment apparatus and method and the adaptive clock synchronization unit relates to real-time data reproducing apparatus and method. Buffer data amount adjustment device described in accordance with the speed information provided by the buffer, the buffer data determining the adaptive rate determining the rate to use part stored in, and the portion wherein the adaptive speed determination using the data stored in the buffer It includes data used parts. Buffer data amount adjustment method according to the invention in accordance with the steps of: (a) determining a rate for the data stored in the buffer, and the fixed speed comprises a step (b) using the data stored in the buffer. Real-time data reproducing method according to the present invention includes (a) generating a clock, and (b) in synchronism with the clock reproducing data stored in the buffer. Real-time data reproducing apparatus according to the present invention includes a reproduction for decoding the real-time data stored in the buffer in accordance with the reproduction clock generated in the adaptive clock synchronization, and the adaptive clock synchronization unit for generating a buffer, a clock. According to the invention it is possible to adaptively in real time, data reproduction in a receiver operating environment. Clock adjustment, a buffer, a real-time data, adaptive adjustment clock, the clock adjustment function,