A Smart set-top box with 4K Ultra HD support is fundamentally defined by its ability to decode and output 4K@60fps video, combined with advanced image technologies such as HDR and wide color gamut, while also meeting bandwidth and interface requirements. The following sections provide a detailed overview covering core specifications, key technologies, product categories, purchasing considerations, and bandwidth and installation requirements.

I. Core Definition and Basic Specifications

A 4K Ultra HD smart Set-top box is a terminal device capable of decoding and outputting video at a resolution of 3840×2160, while integrating an intelligent operating system and network connectivity. Its core specifications include:

II. Key Technologies and Functions

1. Video Decoding and Image Enhancement

• Supports hardware decoding of 4K@60fps video, primarily using H.265/HEVC and AVS2. Some high-end models also support AV1 for improved compression efficiency and smoother playback.

• HDR technologies such as HDR10, HDR10+, and Dolby Vision enhance brightness and shadow detail, while BT.2020 color space and 10-bit depth deliver more natural and vivid colors.

• Certain models include upscaling or frame interpolation technologies to improve the display quality of lower-resolution content.

2. Smart Interaction and Network Capabilities

• Powered by intelligent operating systems such as Android TV or HarmonyOS, supporting app installation, voice control, and multi-screen interaction including screen casting and mirroring.

• Network support includes Gigabit Ethernet and dual-band Wi-Fi (2.4GHz / 5GHz), ensuring stable transmission of 4K video streams.

• Some devices integrate AI features such as intelligent search, content recommendations, and voice assistants.

3. Interfaces and Connectivity

• Video output: HDMI 2.0 or higher, with some models supporting HDMI 2.1 for compatibility with advanced displays.

• Audio output: HDMI ARC/eARC and optical (SPDIF), supporting Dolby Atmos and DTS:X surround sound formats.

• Expansion interfaces: USB 2.0/3.0, RJ45 Ethernet, and Micro SD card slots for local media playback and network access.

III. Main Product Categories

IV. Selection and Usage Considerations

1. Core Performance

• Prioritize models supporting H.265 / AVS2 decoding at 4K@60fps, with at least 2GB RAM and 8GB storage for smooth operation.

• HDR format support, especially HDR10 or Dolby Vision, significantly enhances viewing quality.

2. Network and Bandwidth

• A minimum bandwidth of 50 Mbps is recommended for 4K playback, while 100 Mbps or higher fiber connections provide optimal performance.

• Dual-band Wi-Fi and Gigabit Ethernet help reduce latency and buffering.

3. Interface Compatibility

• Ensure HDMI 2.0 or higher is available to support 4K@60fps output. HDMI 2.1 enables higher refresh rates and features such as VRR.

• Audio interfaces should match external sound systems; HDMI ARC/eARC simplifies wiring while delivering high-quality audio.

4. Compliance and Content

• Certified set-top boxes ensure content compliance. IPTV and cable boxes must align with operator services, while OTT boxes should consider content licensing and copyright compliance.

V. Development Trends

1. Miniaturization and Integration
   Plug-in micro set-top boxes are gaining popularity due to their compact size, easy installation, and integration of Bluetooth, infrared, and emerging short-range communication technologies.

2. AI and Interaction Upgrades
   AI voice control, intelligent recommendations, and multimodal interaction are becoming standard, improving usability and personalization.

3. Encoding and Transmission Optimization
   The adoption of AV1 improves compression efficiency, while Wi-Fi 6 / 6E and new wireless technologies enhance transmission stability and reduce bandwidth pressure for 4K streaming.