The **PCIE-RTV24** is a high-performance, 4-channel real-time video capture card typically used in industrial imaging, surveillance, and machine vision applications. It is designed to capture multiple analog video signals simultaneously over a PCI Express interface. --- ### 1. Key Electronic Components The architecture of the PCIE-RTV24 is built around high-speed digitization and data bus management. | Component | Function | Description | |:---|:---|:---| | **Video Decoder ICs** | Signal Conversion | Converts incoming NTSC/PAL analog signals into digital YUV data. | | **PCIe Bridge Chip** | Data Transfer | Interfaces the video data with the PC's motherboard via the PCIe bus. | | **On-board Buffer (RAM)** | Data Smoothing | Prevents frame loss during high CPU load by buffering video frames. | | **DC-DC Converters** | Power Management | Steps down the 12V/3.3V PCIe power to the specific voltages required by the ICs. | | **Crystal Oscillators** | Timing | Provides precise clock signals for synchronization of video frames. | --- ### 2. Technical Specifications The board is engineered for "Real-Time" performance, meaning it can capture full frame rates across all channels without multiplexing lag. * **Bus Interface:** PCI Express x1. * **Video Inputs:** 4-channel BNC connectors. * **Resolution:** * **NTSC:** 720 x 480 @ 30 fps (per channel). * **PAL:** 720 x 576 @ 25 fps (per channel). * **Color Space:** Supports YUY2, RGB32, and RGB24 formats. * **I/O Ports:** Often includes internal headers for TTL digital I/O (triggering sensors or alarms). --- ### 3. Circuitry Highlights #### A. Multi-Channel Processing Unlike budget cards that "switch" between inputs (causing flicker), the RTV24 features **four independent video decoders**. This allows for simultaneous, non-interfering streams for each of the 4 cameras. #### B. Anti-Aliasing & Filtering The input stage contains passive electronic filters (capacitors and inductors) to reduce electromagnetic interference (EMI) and high-frequency noise from the analog cables before the signal reaches the digital decoder. #### C. Watchdog Timer Many industrial versions of this card include a hardware **Watchdog Timer**. If the software freezes, the electronic circuit can trigger a system reset or an interrupt to ensure continuous monitoring. --- ### 4. Integration Diagram (Simplified) ```mermaid graph LR A[Analog Camera 1-4] --> B[Input Protection/Filters] B --> C[4x Independent Decoders] C --> D[FPGA / PCIe Controller] D --> E[PCI Express Slot] D --> F[Internal GPIO/TTL] ```