Ahc-Rac Audio Encoding Features; Ahc Coding Mode, Sampling Frequencies, And Aes Bit Rates - Harmonic Electra9200 Installation Manual

Chapter 6 Audio Modules
On the encoders, the digital audio ports are DGTL AUD1, DGTL AUD2, DGTL AUD3. The
n
port labeled DGTL AUD4 is unused.
For multi-channel audio, use three cables to connect the surround mix, connecting L/R to
n
DGTL AUD1, C/Lfe to DGTL AUD2, and Ls/Rs to DGTL AUD3, which maps the channels
to AES3 pairs as defined by SMPTE 320M. The fourth connector is not used.

AHC-RAC Audio Encoding Features

Table 6–4: AHC-RAC Audio Encoding Features
Feature
Digital input
Input format
Audio encoding
format
Extraction from serial
digital video (48 kHz
sampling only)
a. requires optional firmware license.

AHC Coding Mode, Sampling Frequencies, and AES Bit Rates

The AHC-RAC modules accept discrete AES3/SPDIF digital, or AES3 embedded in HD/SD
serial digital video inputs. For discrete AES3 inputs, sampling frequencies of 48 kHz, 44.1
kHz, and 32 kHz are supported. Embedded in digital video is supported only for 48 kHz
sampling, which must be synchronous to the video.
© 2015 Harmonic Inc. All rights reserved.
Digital multi-channel or multiple stereo inputs
n
One 5.1 surround, or three stereo pairs per card (surround mix
n
on three AES3 signals with channels mapped per SMPTE
320M (L/R, C/Lfe, Ls/Rs)
Digital: AES/EBU, S/PDIF, IEC60958
n
Embedded: from SDI (synchronous to video)
n
MPEG-1 Layer II 2.0 (stereo) compression
n
AC-3 single 5.1 or multiple 2.0 compression
n
AC-3 metadata input
n
AC-3 (2.0 or 5.1) pass-through
n
AAC/HE AAC single 5.1 or multiple 2.0 audio compression
n
with either MPEG-2 or MPEG-4 encapsulation
Single channel, dual, stereo, and joint stereo (MPEG-1 Layer II
n
and AAC/HE AAC only)
Single PID per Channel support with MPEG-1 Layer II
n
MPEG-1 Layer II
n
Select up to three pairs
n
56
Support
a
a
Electra 9200, Rev O
AHC-RAC Module