Audio Menu
The following diagram illustrates the structure and flow of the
Audio Menu
on the Adtec
EN-30 device:
Control
Function
Options
API Command
<< 1 - 2 >> Parallel Menus.
Surround
Sound
Determines the surround sound
mode
OFF, DD, DD-06,
AAC-LC,AAC-HEv1
*.ECMD# SMO 0
<< 1 -4 >> Parallel Menus.
Input
Determines type of audio input
being received
Note: AES and Analog input are
only available for Audio1 and
Audio2
SDI
Analog
AES
*.ECMD# AIN (0-3)
Mode
The Audio Mode can be set to
ENCODE (compress the audio)
or PASSTHRU (accept
compressed Dolby or PCM type
bitstream on SDI or AES. It will
be time-aligned and multiplexed
into the transport stream.)
OFF
Encode
Passthru
*.ECMD# AMO (0-3)
SEE AMO in API
documentation
Type
If the mode is ENCODE, the type
can be set to MPEG, AC3, and
AAC codec. If the mode is set to
PASSTHRU, there is support for
Dolby E, Dolby Digital AC3 and
5.1, PCM (302M), and Linear
Acoustic E2. Dolby Digital is
part of the ATSC A53 spec. with
a stream type of 0x81 and
required for ATSC applications.
DD 0x81
MU 0x03
DE
LP
DD 0x06
MU 0x04
AAC-LC
AAC-HEv1
AAC-HEv2
*. ECMD# AMO (0-3)
SEE AMO in API
documentation
Rate
Mpeg1Layer2 32-384 kbit/s
AC3 Encode 56 - 640 kbit/s
AAC - 48 - 320 kbit/s
PASSTHRU - Auto-Detects
32 - 640 kbit/s
*.ECMD# AMO (0-3)
SEE AMO in API
documentation
Level
Audio Level can be set in
one-decibel increments, with a
range of -18 to +8 decibels.
Available only in Encode Mode.
-18 - +8 dB
*.ECMD# ALV
(0-3)
Sync
Audio Sync set the audio sync
+/- 800 ms
*.ECMD# AUS (0-3)
