NEXUS – XHDI – The concept:

The XHDI card is a combined de-embed- der and embedder for audio signals in HDSDI and SDI video signals to SMPTE 259M, 292M and 424M/425M. The card supports automatic format detection of the video data streams and is able to read, exchange and embed all 16 embedded audio signals simultaneously. Various modes are available for this: De-Embed, Embed, Replace, Bypass and Delete allow flexible handling of the embedded audio data. The unpacked channels can be used freely in the NEXUS routing matrix. To be able to adjust the levels as soon as you enter the system, a DSP is provided on the module. The image-sound offset that occurs during separate audio-video processing can be compensated by means of delay. A video delay before re-embedding is also possible.

Requantisation can be activated for audio formats with a different word width, such as 20 or 16 bit. Dithering and noise shaping are of course available. When setting up new systems or troubleshooting, an integrated video test pattern generator that supports the various resolutions and frame rates can be used to connect the XHDI with the XDED or XDEE board using a short cable within the NEXUS base unit for practical integration of Dolby E signals.

The metadata contained in the SD/HD data stream can be read and written. They can be received from or output to external devices via the optional XDEM interface card. Even more convenient when using a NEXUS Dolby E card is the connection via the NEXUS network, e.g. to an XTI serial data transfer card.

The XHDI board is available in two versions: with four BNC connectors for Video In, Thru and 2x Video Out and alternatively with a bidirectional SFP port, which connects to an LC-duplex fiber with different modules. Optionally, the board can be equipped with sample rate converters to operate the NEXUS system in a different clock to the audio signals from the video source.