Core Functionality:
- 4-Input, 1-Output HDMI Multi-viewer: Allows connection of up to four distinct HDMI video sources (e.g., PCs, gaming consoles, media players, security cameras) and displays them concurrently on one HDMI monitor, TV, or projector.
- Seamless Switcher: In single-display mode, it often features seamless switching between input sources, meaning no black screens or noticeable delays during transitions.
- Multi-View Modes: Provides various display layouts to view multiple sources simultaneously. Common modes include:
- Quad View: All four inputs displayed in equal-sized quadrants.
- Dual View (PBP – Picture-by-Picture): Two inputs side-by-side or stacked.
- Picture-in-Picture (PIP): One main input with a smaller inset window of another input, often with adjustable size and position.
- Triple View: Various layouts displaying three sources.
- Single View (Full Screen): Displays one input source at full screen.
Video Specifications:
- HDMI Compliance: Typically HDMI 1.4, HDMI 2.0, or HDMI 2.0b, depending on the maximum supported resolution and features like HDR.
- HDCP Compliance: HDCP 1.4 or HDCP 2.2 (essential for 4K content, especially streaming services and Blu-ray).
- Input Resolutions: Supports a wide range of HDMI input resolutions, including:
- 480i/p, 576i/p, 720p, 1080i, 1080p (Full HD)
- 4K (UHD): 3840×2160 @ 30Hz or 4K@60Hz (4:4:4 or 4:2:0). The ability to do 4K@60Hz (with full color depth like 4:4:4) indicates a higher-end model with HDMI 2.0/2.0b and higher bandwidth.
- Output Resolutions: The multi-viewer often scales the output to a desired resolution, typically:
- 1080p@60Hz
- 4K@30Hz or 4K@60Hz (matching the highest input resolution or downscaling/upscaling as configured).
- Some models allow manual selection of output resolution.
- Video Bandwidth: Crucial for 4K.
- For 4K@30Hz, bandwidth is typically around 10.2 Gbps (3.4Gbps per channel / 340MHz pixel clock).
- For 4K@60Hz, bandwidth is higher, often 18Gbps.
- Color Depth: Supports 8-bit, 10-bit, or even 12-bit Deep Color (depending on HDMI version and model).
- Color Space: RGB, YCbCr 4:4:4, YCbCr 4:2:2, YCbCr 4:2:0.
Audio Specifications:
- HDMI Audio Pass-through: Passes through embedded audio from the selected source or the dominant source in multi-view.
- Audio Extraction/De-embedding: Many 4K multi-viewers include:
- Optical (SPDIF/Toslink) Out: For connecting to a soundbar or AV receiver, often supporting Dolby Digital, DTS 5.1, PCM 2.0.
- 3.5mm Stereo Analog Out: For connecting headphones or stereo speakers, usually PCM 2.0.
- Audio Source Selection: Ability to choose which input’s audio is outputted, even if its video isn’t the primary one in a multi-view layout.
Control Methods:
- Front Panel Buttons: For direct source selection and mode switching.
- IR Remote Control: Included for convenient wireless control.
- RS-232 Control: Often includes an RS-232 port for integration with professional control systems (e.g., Crestron, AMX).
- OSD (On-Screen Display): Some models feature an OSD for more advanced settings and layout customization.
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