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Boîtier de scène 8/8 Ethernet ADAT

ADAT déporté jusque sur la scène via une liaison Ethernet.
ADAT remotely connected to the stage over an Ethernet link.

WIZnet

Published November 30, 2022

Original author: jeanmarcvillers · FranceOriginal source (new tab)

Boîtier de scène 8/8 Ethernet ADAT

Components

Hardware components
WIZ850io

WIZnet - WIZ850io

x 1

Project description

ADAT 8/8 Ethernet Stage Box

ADAT remoted to the stage via an Ethernet link.

ADAT 8/8 Ethernet Stage Box

ADAT 8/8 Ethernet Stage Box

Stage box: 8 balanced outputs / 8 balanced “microphone sensitivity” inputs.

ADAT 8/8 Ethernet Stage Box

Top view of the stage box.

ADAT 8/8 Ethernet Stage Box

Stage box: 8 (2 stacked decks) PGA2505 micro preamps with digital controls + PAD + 48 V

ADAT 8/8 Ethernet Stage Box

Next to the console, in ADAT + Word Clock connection

ADAT 8/8 Ethernet Stage Box

“Console” part in its case when my friend Nico will have machined the front and rear faces in aluminium.

ADAT 8/8 Ethernet Stage Box

The Windows configuration app. A “Clip” lights up in red below the PAD of each channel in case of saturation.

ADAT 8/8 Ethernet Stage Box

The PIC's main role is to “monitor” the audio core. As soon as a reception problem occurs, detected by a frequency different from 12 KHz coming from the Ethernet reception, the “mute” signal is activated and the reinitialization of the configuration of the FPGA possibly carried out. This is important to avoid audio shock. The PIC also takes care of the links with the control application (WIFI remains to be developed). Admittedly, a NIOSII soft-processor could have been used but there is no longer enough space in the FPGA.
 

ADAT 8/8 Ethernet Stage Box

ADAT 8/8 Ethernet Stage Box

The system triggering the sending of an ADAT frame is divided into two parts in order to reduce jitter as much as possible compared to WC. The high frequency (196.608 MHz) associated with the taking into account of the most recent edge for the triggering of the processes makes it possible to achieve this goal. I relied on https://ackspace.nl/wiki/ADAT_project for the frame structure. However, I did not take into account the FPGA implementation provided (which also deals with the decoding of an ADAT frame and not the encoding) Attention, the first index bits designate the significant audio data bits strong.

ADAT 8/8 Ethernet Stage Box

ADAT 8/8 Ethernet Stage Box

ADAT 8/8 Ethernet Stage Box

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