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HDMI Audio Extractors & Embedders | De-Embed, Downmix & Embed HDMI Audio
About HDMI Audio Extractors & Embedders
VigilLink's HDMI Audio Extractors & Embedders operate on the forward HDMI signal path — the cable running from source to display — to either extract the embedded audio signal as a separate output, or insert an external audio source into the HDMI stream. This subcategory addresses two complementary scenarios: first, when an HDMI source such as a media server, Blu-ray player, or PC must simultaneously feed a display and a separate audio system that has no HDMI input; and second, when a legacy analog or optical audio source must be combined with an HDMI video signal into a single-cable output.
Choosing the Right HDMI Audio Extractor or Embedder
8K HDMI 2.1 Audio De-Embedder (VLHA-H21DEM): The VLHA-H21DEM supports 48Gbps HDMI 2.1 with 8K@60Hz and 4K@120Hz passthrough, VRR, ALLM, HDR10+, and Dolby Vision, de-embedding HDMI or ARC audio to simultaneous S/PDIF optical and 3.5mm analog stereo outputs while passing full-bandwidth video to the display. Choose the VLHA-H21DEM for any 8K or 4K@120Hz signal chain requiring simultaneous audio breakout without compromising the video path.
HDMI Audio Extraction without Downmix — 4K 18Gbps (VLHA-DEM): The VLHA-DEM extracts audio from any HDMI 2.0 source — passing video through intact — and outputs it simultaneously as S/PDIF optical and 3.5mm analog stereo L/R. HDMI audio passes through unmodified, including LPCM 7.1CH, Dolby Atmos, DTS-HD Master Audio, and DTS:X. Optical output supports LPCM 2.0, Dolby Digital 2.0/5.1, and DTS 2.0/5.1. Choose the VLHA-DEM when the audio destination can accept HDMI or optical input and no downmix is required.
HDMI Audio Extraction with Downmix — 4K 18Gbps (VLHA-DWM): The VLHA-DWM matches the VLHA-DEM in video and optical audio handling, adding active bitstream downmix on the L/R analog output — multi-channel Dolby and DTS are decoded to PCM 2.0 stereo so a stereo-only amplifier receives correct audio regardless of source encoding. HDMI and optical outputs remain full-bitstream pass-through simultaneously. Choose the VLHA-DWM when the analog destination is a 2-channel system that cannot decode surround bitstreams.
HDMI Audio Embedding — 4K 18Gbps (VLHA-EMR): The VLHA-EMR works in the opposite direction, accepting an HDMI video input and embedding an external S/PDIF optical or analog stereo source into the HDMI output stream. Video passes through at up to 4K@60Hz YUV4:4:4 with 10-bit HDR and CEC bypass. Choose the VLHA-EMR when an external audio source — Bluetooth receiver, analog mixer, or legacy system — must ride an HDMI cable to a display or AV system.
Frequently Asked Questions
What is the difference between the VLHA-DEM and the VLHA-DWM?
Both models extract audio from an HDMI 2.0 source and output it to S/PDIF optical and 3.5mm analog L/R while passing HDMI video through to the display. The key difference is the analog output behavior: the VLHA-DEM outputs audio as-is on the analog port — which may produce no output if the source is encoding surround content as a Dolby or DTS bitstream rather than PCM stereo. The VLHA-DWM includes active downmix circuitry that decodes any bitstream format and outputs PCM stereo on the L/R port regardless of source encoding. Choose VLHA-DWM for any installation where the analog destination is a stereo-only amplifier or speaker system receiving content from a source that may output surround formats.
Does audio extraction interrupt the video signal to the display?
No. The VLHA-DEM, VLHA-DWM, and VLHA-H21DEM all operate as in-line devices with full HDMI pass-through to the display. Video continues at full bandwidth — 4K@60Hz YUV4:4:4 for the DEM and DWM, 8K@60Hz for the H21DEM — with no interruption, degradation, or added latency. The audio is extracted simultaneously from the HDMI stream without affecting the video signal.
Can the VLHA-EMR replace audio on an HDMI signal — for example, add external background music over an HDMI video feed?
Yes. The VLHA-EMR accepts an HDMI video input and replaces or supplements the embedded audio with the signal from its optical or analog audio input. The result is output as a single HDMI stream. This makes it suitable for scenarios such as adding background music from a Bluetooth receiver to a lobby display, replacing the audio track on a media player output, or adding a room microphone mix to a video conferencing source before the HDMI cable run to the display.
What is the maximum audio sampling rate supported by these products?
The VLHA-DEM supports audio sampling rates up to 192kHz on the HDMI pass-through path. The VLHA-DWM supports up to 96kHz on the HDMI path. The VLHA-EMR supports audio sampling rates up to 192kHz on HDMI pass-through and accepts optical audio at standard LPCM and compressed format rates. All models support the standard 48kHz sampling rate for all audio formats, which is the broadcast and professional AV standard.
Does the VLHA-H21DEM support ARC as well as standard HDMI audio extraction?
Yes. The VLHA-H21DEM supports both standard HDMI audio de-embedding from the forward path and ARC audio extraction from a TV's ARC channel via the TV(ARC) HDMI output. This makes it flexible for installations where the device may be positioned either between source and display (de-embedding mode) or between a TV and an audio destination (ARC extraction mode). CEC control from output devices to input sources is supported in both configurations.