User Manual

Operational Overview
The LStream header on the AES16e is an expansion port that provides an additional 16 inputs from a Lynx
LStream device, such as the LS-ADAT that offers 16 channels of ADAT lightpipe. The signals from the
LStream header are routed through the LStream receiver, which feeds the Input Bus.
5.1.2 Digital Mixer Inputs
The digital mixer has 16 input blocks that receive data from the Input Bus and drive the 16 channels of the
record bus. Each of these blocks has an input selector that allows selection of any signal on the Input Bus.
This selector allows flexible patching of any AES16e physical input signal to any of the 16 Record Bus
channels as well as any of the 16 LStream channels. After the selector, the signal passes through a mute
switch and then through the dither block, which offers three popular dither algorithms and bit-depth
control. The output of the dither block is measured for peak level meters and feeds one of the Record Bus
channels.
Software control of the digital mixer’s input blocks is provided in the Record/Play window of the Lynx
Mixer application. The input selector corresponds to the Input Source select buttons (above the faders for
each record channel). Mute and dither controls are also provided for each channel on this window.
5.1.3 Record Bus and Devices
The 16 channels of the Record Bus are derived from the outputs of the mixer input blocks. These signals
are routed to the host computer via the PCIe bus to the AES16e driver and also feed the output section of
the digital mixer to provide zero latency record monitoring.
The AES driver installed on the host computer assigns the 16 channels from the Record Bus to eight stereo
record devices as follows:
 Record Bus Channel 1 feeds the left channel of Record Device 1
 Record Bus Channel 2 feeds the right channel Record Device 1
 Record Bus Channel 3 feeds the left channel Record Device 2
 (etc)
 Record Bus Channel 16 feeds the right channel Record Device 8
5.1.4 Play Bus and Devices
The Play Bus is derived from the 16 channels sent to the AES16e play devices from host applications. In
other words, when an application is used to playback a file, the data from the file is sent to an AES16e play
device. The AES16e driver routes this data to the Play Bus, which feeds the output section of the digital
mixer. Similar to the Record Bus, the 16 channels of the Play Bus correspond to the AES16e’s sixteen play
devices are follows:
 Left channel of Play Device 1 feeds Play Bus Channel 1
 Right channel of Play Device 1 feeds Play Bus Channel 2
 Left channel of Play Device 2 feeds Play Bus Channel 3
 (etc)
 Right channel of Play Device 16 feeds Play Bus Channel 32
5.1.5 Digital Mixer Outputs
The 16 output signals of the digital mixer are derived from 16 ten-input submixers. The Record Bus and
Play Bus feed the submixer inputs, which each have an associated selector (labeled Monitor Select in the
diagram) and volume control. The submixers use 40-bit accumulators to maintain signal accuracy. The
output of the submixers are dithered to 24-bits using triangular PDF dither and then measured for peak
level metering in the Lynx Mixer application.
This architecture allows each digital mixer output to be a mix of up to ten signals derived from any AES16e
input or any play device receiving data from a host application in playback mode. This capability is sample
AES16e User Manual
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