The invention relates to an HDMI (High Definition Multimedia Interface) retimer circuit applied to rail transit and an implementation method, which solve the problems of attenuation, distortion and the like of long-distance transmission audio and video signals and improve the transmission stability and quality. The circuit is composed of a power management module, an HDMI input and output module, an HDMI retiming module, an MCU control module and an audio processing module. The power management module converts 5V voltage into 3.3 V voltage and 1.2 V voltage, and supplies power to each module; the retiming module uses an MS9331 chip to complete signal clock recovery, equalization, retiming and audio separation; the MCU control module adjusts the signal state through an I2C interface; and the audio module converts the I2S audio into an analog signal through a DAC and outputs the analog signal. The system is suitable for rail transit scenes, stable transmission of high-definition signals is achieved, double-screen different display and audio output are supported, and high expansibility is achieved.

    本发明涉及一种应用于轨道交通的HDMI重定时器电路及实现方法,解决长距离传输音视频信号衰减、失真等问题,提升传输稳定性和质量。电路由电源管理、HDMI输入输出、HDMI重定时、MCU控制和音频处理模块组成。电源管理模块将5V电压转换为3.3V和1.2V,供电至各模块;重定时模块使用MS9331芯片,完成信号时钟恢复、均衡、重定时及音频分离;MCU控制模块通过I2C接口调节信号状态;音频模块通过DAC将I2S音频转为模拟信号输出。本发明适用于轨道交通场景,实现高清信号稳定传输,支持双屏异显及音频输出,具备高扩展性。


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    Title :

    HDMI (High Definition Multimedia Interface) retimer circuit applied to rail transit and implementation method


    Additional title:

    一种应用于轨道交通的HDMI重定时器电路及实现方法


    Contributors:
    YANG SHUAI (author) / SHI BINGCHEN (author) / XU ZHIHAO (author) / PANG TONG (author) / ZHAO WENLONG (author) / DONG GUOJUN (author) / WANG ZHICHAO (author) / YAO JINLONG (author)

    Publication date :

    2025-01-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    H04N PICTORIAL COMMUNICATION, e.g. TELEVISION , Bildübertragung, z.B. Fernsehen / B61L Leiten des Eisenbahnverkehrs , GUIDING RAILWAY TRAFFIC / H03K PULSE TECHNIQUE , Impulstechnik




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