Ensemble Designs BrightEye 20 Analog and Digital Audio Embedder or Disembedder - Manual (Page 3)

TM BrightEye 20
upstream phasing problems. Peak Program and VU indication for each of the
four output channels is displayed through the BrightEye Control application and
on the front of the unit.
The output of the mixer is delivered simultaneously in digital form on the two
AES ports, and in analog form on the four analog audio outputs.
Multiplex Operation
When configured as an Audio Embedder (multiplexer), BrightEye 20 can take
either analog or digital AES audio signals and combine them with a 601 digital
video stream to produce a single output signal.
The video input is taken from the SDI In BNC. Selection of Digital (AES) or
Analog audio source is made with the Audio In control
Analog audio inputs are digitized to 24 bits of resolution at a sample rate of
48Khz. 128 times oversampling is used to provide the highest possible fidelity in
the digitized signal. The sample rate is automatically derived from the video
signal in order to meet the embedding requirement of synchronicity between the
digital video and digital audio signals. The analog audio inputs can be selected
with either a -10 dBu (pro-sumer) or +4 dBu (professional) reference level.
When digital audio inputs are selected, the 2 AES ports are automatically config-
ured as inputs. The AES ports support standard two-channel audio streams at up
to 24 bits of resolution. These inputs are connected to digital sample rate convert-
ers that allow BrightEye 20 to be used with asynchronous digital audio sources.
The sample rate converters can accept sample rates from 32 to 96 kHz. They
produce 24 bit audio at 48 kHz which is locked to the clock rate of the video
input.
The four channels of the selected audio source (analog or digital) feed a 4 channel
mixer/shuffler. This mixer provides precise adjustment of audio level for each
channel, and the ability to assign input channels to any combination of output
channels. Additionally, signal phase inversion can be selected on a channel by
channel basis to address upstream phasing problems. Peak Program and VU indi-
cation for each of the four output channels is displayed through the BrightEye
Control application and on the front of the unit.
The four channels of mixed audio feed the embedder. The embedder can be config-
ured to replace any content currently present in the video stream, or cascade
(append) the new content to any existing embedded audio. The embedder can be
configured to mark its content as any of the four possible embedded groups. This
new video stream will appear on the SDI Out BNC connector.
When embedding from analog audio, the AES outputs will present the output of
the audio mixing section. When embedding from AES sources, the analog audio
port configures for output and will present the mixer output in analog form.
BrightEye-3