AEQ
CAPITOL
Ultra-compact digital audio mixer
33
2.2.3.7. USB inputs and outputs.
AEQ CAPITOL includes 2 stereo USB digital inputs/outputs available through 2 type-B USB
connectors identified as “
USB 1
” and “
USB 2
”. Each one includes 1 input and 1 output.
When you connect a USB module to a PC through any of the USB ports, the PC will
automatically recognize it as a new audio device (it will be shown as “USB Audio CODEC”). To
this device you can send audio from any audio playback application in the same way as if it was
an external professional audio board. It is also possible to record any audio from the mixing
console in the computer by using any recording application.
These boards are “plug&play” on Microsoft Windows™ and Apple Computer Mac OS™
operative systems, no specific driver is needed. When you connect several USB ports from one
or several USB modules to the same PC, the operative system will show a new audio device for
each one, that will be identified as “USB Audio CODEC”, “USB Audio CODEC (2)”…
Supported sampling frequencies are 32 KHz, 44.1 KHz and 48 KHz, with sampling rate
converters (SRC) to 48 KHz that corresponds to the internal sampling rate of the system.
IMPORTANT NOTE:
It’s necessary to use shielded cable in order to establish connection
between USB module and PC.
2.2.4. Optional inputs/outputs modules.
2.2.4.1. MADI communications optional module.
The integrated multichannel MADI interface physical connector can be found at the back panel
of AEQ CAPITOL, labelled as “MADI”. This interface is not equipped by default unless option
“
CA11: MADI MODULE
” has been purchased.
If you acquire this option (“CA11: MADI MODULE”) later on, simple instructions will be enclosed
with the module, allowing easy installation by any person with minimal experience in handling
electronic equipment or computers.
MADI protocol, which stands for multichannel audio digital interface is a professional standard
of data transmission for digital audio signals over 56 channels on a single cable. MADI protocol
is documented in the standard AES10-1991 and ANSI s4.43-1991.
AES10 MADI multichannel interface is an extension of AES3 protocol for interconnection of
multi-channel. MADI protocol, as defined in the AES10 standard allows connection of up to 64
audio channels (linearly quantified data) with a resolution of 24 bits per sample and a sampling
rate frequency of 48 kHz/s. Transmission is accomplished in a serial mode and if transmission is
done on a single 75 ohm coaxial cable with BNC connectors the distance reached is greater
than 50 m. If transmission is accomplished on a multi-mode fiber-optic interface (transceiver)
with the specifications that the AEQ CAPITOL is providing the distance is up to 2 km.
The audio samples may have a maximum of 32 bit quantization. Additionally, by using this
protocol, the bits of validity user status and parity of AES3 are maintained. The MADI protocol
allows you to connect 64 audio channels with a single pair of wires. The data bit rate is 100
MBits/s corresponds to a synchronous connection.
AEQ CAPITOL MADI Interface Specifications:
•
Optical fiber connector, FDDI PMD type.
•
Nominal range: 2000 meters.
•
Fiber Type: 62.5 / 125 µm MULTIMODE
•
Transmission: LED, 1300 nm
NOTE:
in order to activate this function you must purchase a user license.
