| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: when a programme clock reference (PCR) is unavailable in a system, a system time clock (STC) is recovered by using a presentation time stamp (PTS) of video or audio data, or a linear combination result of the PTS of the video data and the PTS of the audio data. The STC is compared with the PTS of the currently captured video and audio data, and the current data processing mode is determined. The difference between the PTS of the video data and the PTS of the audio data is monitored. The absolute value of the difference is compared with a preset threshold value, and when the absolute value is greater than or equal to the threshold value, an asynchronous play mode is adopted as a system play mode; otherwise, a synchronous play mode is adopted as the system play mode.EFFECT: synchronisation of video and audio signals when the PCR is unavailable in a decoding system.10 cl, 8 dwg |
