液晶电视色度自动测试及校正系统

针对目前液晶电视色度性能上的不足,介绍了一种利用CA-210测试仪和PC对液晶电视进行自动色度校正的系统,给出了其系统及软件结构。实验数据表明,其校正时间短,校正精度高,取得了良好的效果

Design of audio demultiplexing system for digital HD video broadcasting

数字视频广播的视频流中可嵌入音频数据。本文研究了符合SMPTE299M标准的高清视频流中音频嵌入原理,在fPgA上设计并实现了高清视频流音频解嵌系统,它能解出采样率为48k的16路声音通道的数字音频信号,并根据需要选择相应通道进行播放。该系统可用于数字演播室中对各个通道的声音监测及播放。Audio data can be embedded in digital video stream for broadcasting.This paper studies the principle of audio embedded in digital HD video according to the SMPTE299M standard, designs and implements the audio demultiplexing system based on FPGA.The system can demultiplex 16 channels audio data sampled at 48K and play out the audio of selected channels which are concerned.It could be used in digital studio for monitoring and playing out the audio in each channel

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^