4- General Characteristics; Main Hardware Characteristics; Main Software Characteristics; Routing Audio Streams In The Card - Digigram ALP222e User Manual

User Manual – ALP222e

4- GENERAL CHARACTERISTICS

ALP222e is a PCI EXPRESS
x2, x4, x8 or x16 slots.

4.1 Main hardware characteristics

2 balanced analog inputs (can be used unbalanced) with software-adjustable analog gain
●
and a maximum input level of +24 dBu.
2 electronically balanced analog outputs, with a maximum output level of +24 dBu.
●
(Electronically balanced outputs can process either balanced or unbalanced lines without
loss of level).
1 stereo AES3 digital input, 32 kHz to 192 kHz, with high quality hardware sample rate
●
converter (SRC).
1 AES11 synchronisation input (up to 192 kHz)
●
1 AES3 digital stereo output (up to 192 kHz)
●
1 mini jack stereo headphone output, which replicates the analog outputs.
●
1 word clock input/output (up to 192 kHz)
●
2 GPI dry contacts and 2 GPO relays
●
Inter-card synchronisation
●

4.2 Main software characteristics

Low latency multi-card drivers
●
Wasapi/DirectSound and ASIO application programming interfaces under Windows, and Alsa
●
and libgpio for Linux
Simultaneous acquisition and playback in PCM (8, 16 and 24 bit), Float IEEE754
●
On-board mixing of physical audio inputs and software "playback" devices to physical audio
●
outputs and software recording devices.
"ALP-X Manager" application installed with the driver, to control the card settings:
●
- clock source
- frequency of the fallback internal clock
- input and output gains, RMS VU-meters with peak-meters
- routing of inputs to outputs
API for implementing the management of the card settings in a software application.
●

4.3 Routing audio streams in the card

The ALP card incorporates an on-board mixer in an FPGA component. This is a mixer with 8 mono
inputs (4 stereo) and 8 mono outputs (4 stereo).
The mixer captures the 4 physical input channels of the card (2 analog channels and 2 AES3
channels) and the 4 channels of the playback devices.
The mixer restores 8 audio channels, respectively to the 4 physical outputs of the card (2 analog
channels and 2 AES3 channels) and the 4 recording device channels.
The mixer can therefore be configured to perform the mixing and the routing of the 8 input
channels to the 8 output channels (8 mix sums).
TM x1 audio card. It can be inserted into and therefore operate in PCIe® x1,
7