XSDI

The embedder/deembedder board for audio in SDI video signals

With the XSDI card, audio signals can be extracted from a digital SDI video data stream, replaced and simultaneously embedded again.

XSDI
With the XSDI card, audio signals can be extracted from a digital SDI video data stream, replaced and simultaneously embedded again. The XSDI video card is an audio de-embedder and embedder for video signals according to the SMPTE-259M (SDI) standard. All 16 audio channels packed in the video data stream can be read and written. Different modes such as 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. 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. An integrated video test image generator helps when setting up new systems or troubleshooting.

The XSDI board is available in two versions: with three BNC connectors for Video In and 2x Video Out and alternatively with a BNC input, a BNC output and a bidirectional SFP port, which connects to an optical fiber with LC-duplex connectors using various 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.

Adjustable digital gain in the inputs

To adjust the levels, a digital gain is implemented for each channel of the inputs.

Adjustable delay for delay compensation compared to the video

An adjustable delay can compensate for the image/sound offset that can result from separate processing.

Integrated test pattern generator

Setup or troubleshooting supports an integrated test generator that generates a color bar in NTSC or PAL format. The pattern is output via the BNC or fiber optic connector.

Integrated DSP

If the word width is reduced during requesting, an integrated DSP calculates a dither to reduce rounding errors. Switchable noise shaping shifts the noise energy in the ear in less sensitive areas.

Optional sample rate converter

Optionally, a sampling rate converter can be installed on the XSDI board to process incoming and outgoing signals asynchronously to the Nexus clock.

Connections

Variant: XSDI_BNC 1 x 4TE
BNC 2x SDI Embedded Output
BNC 1x SDI Embedded Input
Variant: XSDI_O 1 x 4TE
FSP 1x SDI Embedded bidirectional
BNC 1x SDI Embedded Output
BNC 1x SDI Embedded Input

Technical specifications

Characteristics

Data formats Embedded audio as specified by SMPTE 259Mand SMPTE 272M-A, -C
Audio data 16 / 20 / 24-bit; officially certified by Dolby® for Dolby E signal transmission
Sample rates 48 kHz acc. to SDI
44,1 kHz and 96 kHz via Sample Rate Converter (only XSDI02)
Data rate 270 Mbit
Note Due to the high data rate, only high-quality cabling with appropriate bandwidth and defined impedance (75 ohm) must be used.

BNC input

Equalizer gain (max.) 40 dB
Jitter tolerance 0.56 UIpp (typ.) @ 270 Mbps
Impedance 75 ohm

Electrical output BNC

Output voltage 800 mVPP (typ.)
Impedance 75 ohm
Delay 0…170 ms @ 48 kHz; adjustable in 1-ms steps (XSDI02 only)

Input optical LC

Type Single-Mode SM
Cable length 15 km/9.32 miles (max.)
Optical sensitivity –28…–8 dBm
Attenuation (max.) 0…13 dB (total attenuation caused by cable, connector, switch, and lines)

Output optical LC

Type Single-Mode SM
Cable length 15 km/9.32 miles (max.)
Wavelength 1274…1356 μm
Optical output power -15...-8 dBm @ 9/125 μm fiber

Operation conditions

Temperature range 0° C to +50° C
Max humidity max. 90 %, non-condensing

Storage conditions

Temperature range –35° C to +70° C
Max humidity max. 90 %, non-condensing

Power supply

Voltage +4,75…5,25 V
Currrent 600 mA

Mechanical data

Weight 0,26 kg

NEXUS / NEXUS Star Technical specificationst

PDF 1

 

 

XSDI Technical specificationst

PDF 1