HDMI (High-Definition Multimedia Interface) is a digital interface standard for high-definition audio and video transmission through a single cable. It is widely used in TVs, monitors, computers, set-top boxes, industrial equipment, and test benches where image quality, synchronization, and signal integrity are required.
HDMI combines visual quality, digital sound, and connection simplicity — ideal for environments that require robustness and precision.
🧩 Main features of HDMI
| Parameter | Technical Description |
|---|---|
| Signal type | Uncompressed digital audio and video |
| Physical layer | TMDS (Transition Minimized Differential Signaling) |
| Common connectors | HDMI type A (standard), C (mini), D (micro) |
| Bandwidth | Up to 48 Gbps (version 2.1) |
| Integrated protocols | CEC (device control), EDID, HDCP (content protection), ARC |
| Cable type | Shielded, differential, with specifications for high data rate and integrity |
🔄 Evolution of HDMI versions
| Version | Release | Resolution / Main features |
|---|---|---|
| 1.0 | 2002 | 1080p, PCM audio |
| 1.3 | 2006 | Deep Color, Dolby TrueHD, DTS-HD |
| 1.4 | 2009 | 4K@30Hz, Audio Return Channel (ARC), Ethernet |
| 2.0 | 2013 | 4K@60Hz, HDR, 32 audio channels |
| 2.1 | 2017 | 8K@60Hz, 4K@120Hz, eARC, VRR (Variable Refresh Rate), DSC |
🧪 Applications in testing and automation
- Testing HDMI interfaces in DUTs (TVs, boards, receivers)
- Validation of resolution, synchronization, and automatic detection (EDID)
- Monitoring of multichannel digital audio (LPCM, Dolby, DTS)
- Compatibility tests between HDMI versions (negotiation)
- Analysis of TMDS signal integrity and HDCP protection
🔧 How AJOLLY Testing tests and validates HDMI interfaces
AJOLLY Testing integrates HDMI validation tools to ensure compliance, robustness, and traceability in production and laboratory environments.
🛠️ Test benches with HDMI sources and analyzers
- Generation of HDMI patterns (1.4, 2.0, 2.1) with test content (video + audio)
- Capture and analysis of DUT signals via dedicated equipment or custom modules
- Integration with control systems for automated verification of handshake, EDID, CEC
📁 Tracking and compatibility
- Recording of detected resolution, frame rate, HDCP handshake
- Tests of hot plug, control channels (CEC), ARC/eARC
- HDMI compliance reports by serial number and firmware
With AJOLLY Testing, you ensure that your HDMI interface is more than compatible — it will be validated, tested, and traceable.