Semiconductor Solutions for SDI-over-IP Connectivity
Semtech’s BlueRiver® AV Processor chipsets provide HDMI connectivity as standard, enabling routing and distribution of AV content over standard 10G Ethernet networks. Key applications, such as live video production and medical endoscopy, use equipment where the primary AV connectivity is serviced by the Serial Digital Interface (SDI). SDI operating at up to 12Gbps can carry 4K60 video over coaxial cable for long reach point-to-point connectivity.
要通过基于 SDVoE 的 AV-over-IP 系统分发 SDI，必须将 SDI 信号与 HDMI 相互转换。Semtech 的新型 GS12170 SDI/HDMI 桥接器件是完美的配套芯片，当与任何 BlueRiver 器件配对时，可通过 IP 网络实现 SDI。该图示例为用于实时 4K 远程摄像头应用的基于 SDI 的 SDVoE 发射器和接收器。SDI PTZ 4K 摄像头的视听信号在 SDVoE 发射器中被转换，在 10G 网络上以 HDMI 格式传输，并在 SDVoE 接收器中被转换回 SDI。GS12170 SDI/HDMI 桥接器是一款可配置为将 SDI 转换为 HDMI 以及将 HDMI 转换为 SDI 的单一器件。
图 1.使用基于 SDI 的 SDVoE 发射器和接收器的实时 4K 远程摄像头应用。
盒子内部：BlueRiver 和 SDI 连接
如下图所示，只需三个主要组件即可将 SDI 与 IP 相互转换。要通过 SDI 支持高达 4K60，需要将 Semtech 12G-SDI 电缆均衡器搭配 GS12170 SDI/HDMI 桥，并配置为 SDI 到 HDMI 转换模式。GS12170 通过标准 TMDS 接口输出 HDMI 信号，该接口可直接连接到 BlueRiver 视听处理器 (AVP) 芯片。接收器处的流程相反，AVP 器件的 TMDS 输出直接连接到 GS12170，模式为 HDMI 到 SDI 转换。将 GS12170 与 Semtech 12G-SDI 电缆驱动器搭配，可提供完全符合 SMPTE 的 SDI 输出。
Figure 2. Only three major components are required to convert SDI to IP and back: Semtech’s 12G-SDI cable equalizer, the GS12170 SDI/HDMI Bridge and BlueRiver AVP.
SDI ancillary data must be transmitted from the source (for example, camera metadata), the GS12170 provides an ancillary data extraction feature, allowing an external microcontroller (MCU) to access this data via a host interface and convert to RS232 packets for transmission over the 10G Ethernet network. The reverse process is applied at the receiver, where the GS12170 will reinsert ancillary data back into the SDI stream, as shown in the diagram. The GS12170 will also convert up to eight channels of embedded digital audio at 48kHz or 96kHz sampling between SDI and HDMI.
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