Grass Valley AMX-1881 - Manual (Page 9)

AMX-1881 HD/SD 8 AES Embedder
Guide to Installation and Operation
AMX-1881 Page 9 of 19
Group detected: indicates embedded audio groups in the
AMX-1881 SDI input by turning green.
AES detected: indicates AES audio on the indicated AMX-
1881 AES input by turning green.
To configure the AES digital audio signals, access the
AES1-2 through AES7-8 tabs. There are two sliders (left
and right for stereo sound) available for each AES to set
the level from -96 dB to +12 dB in steps of 0.5 dB. To invert
the selected audio channel phase, check the phase invert
boxes. The lock option locks both channel level sliders
together, so that moving one slider moves the other one as
well. The mute option mutes both audio channels
completely. The swap option interchanges the right and
the left audio channels. The sample rate converter can be
set to either auto or off. While in auto mode, the sample
rate conversion process is automatically turned off upon
detection of non-pcm channel status.
The Delay tab allows the user to set the delay of the AES
audio as it passes through the embedder. The delay is
selectable between none, and a number of video frames (0
to 3 frames in 0.5 frames steps).
The Embedding tab specifies the content of the AES
groups embedded in the output signal. Each group can be
composed of a pair of AES inputs (AES1-2 , AES3-4,
AES5-6, or AES7-8). If the video input already contains an
embedded audio group, it can either be allowed to pass
through directly without modifications (PASS) or it can be
deleted (DELETE). The SD Embed bits is fixed at 24 bits
for HD. For SD signals, the options are 20 or 24 bits
The status tab monitors some of the information carried in
the AES inputs channel status..
The Bits status monitors the audio samples word length (in
bits). The possible values are 16 bits, 20 bits, 24 bits or
other. If the information is not available, it will show as N/I.
The Mode status monitors the channel mode. The possible
values are two channels (Two ch), one channel (One ch),
primary or secondary (Pri/Sec), Stereo or Other. If not
indicated, it will show as N/I.
The Emph status monitors the audio channel emphasis.
The possible values are none, 50/15
µs (CD type) and
J.17. If not indicated, it will show as N/I.
The Use status monitors the use of channel status block.
The possible values are either professional (PRO) or
consumer (CONS).
The Encd status monitors the audio channel encoding
type. The possible values are PCM or NPCM (non PCM).