BROADCASTING SYNCHRONIZATION METHOD AND PORTABLE TERMINAL

摘要

A broadcasting synchronization method and a portable terminal are provided to improve synchronization correctness of a broadcasting station and to control a distortion of a replay sound by using a system clock for broadcasting without adding a voltage controlled oscillator to a portable terminal. A TS(Transport Stream) processing unit(200) extracts a PCR(Program Clock Reference) from MPEG2-TS data. A TS-DeMux unit(201) divides the MPEG2-TS data into video data and audio data. An audio decode unit(204) converts the audio data divided by the TS-DeMux unit(201) into PCM(Pulse Code Modulation) data. An audio control unit(205) outputs the PCM data converted by the audio decode unit(204) to a predetermined sampling frequency. A CPU core unit(206) controls elements of the CPU. A DMAC(Direct Memory Access Controller)(207) instead of the CPU core unit(206) transmits the PCM data to the audio control unit(205). A PCR(Program Clock Reference) extraction unit extracts PCR overlapped with a head part of the MPEG2-TS. An internal reference clock generation unit generates an internal reference clock of a portable terminal from a system clock. An internal reference clock counter unit performs a counter up operation by an internal reference clock of the portable terminal and performs a compensation based on counter value compensation information. A comparison unit outputs the counter value compensation information to the internal reference clock counter unit by comparing the PCR value with the counter value. An internal reference clock counter value maintaining unit maintains the counter value of the internal reference clock counter unit until the CPU core unit determines the counter value by a DMAC transmission completion interrupt.