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Chapter 6 Audio Modules
Connecting the AHC-561 Audio Input Cables
Connect a coaxial cable with BNC connectors from the digital audio port to the audio source:
On the encoders, the digital audio ports are DGTL AUD1, DGTL AUD2. DGTL AUD3, and
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DGTL AUD4.
For multi-channel audio, use three cables to connect the surround mix, connecting L/R to
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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.
AHC-561 Audio Encoding Features
The AHC-561 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.
Table 6–6: AHC-561 Audio Encoding Features
Feature
Digital input
Input format
Audio encoding
format
Extraction from serial
digital video (48 kHz
sampling only)
a.
Requires an optional firmware license.
Dolby Digital Metadata with the AHC-561
Dolby Digital signals include metadata describing the contents of an audio stream. The
metadata can assist the decoder in adjusting listening volume, downmixing from multi-
channel to stereo, and other features. The metadata can be received via a serial stream
through the AHC-561's RJ-45 connector.
Section
AHC-RAC Metadata Connection
© 2015 Harmonic Inc. All rights reserved.
Digital multi-channel or multiple stereo inputs
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One 5.1 surround plus one stereo pair, or four stereo pairs per
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card (surround mix on three AES3 signals with channels
mapped per SMPTE 320M (L/R, C/Lfe, Ls/Rs)
Completely embedded audio extraction of twelve pairs from
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six groups from serial digital video input (48kHz synchronous
to video only)
Digital: AES/EBU, S/PDIF, IEC60958
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Embedded: from SDI (synchronous to video)
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MPEG-1 Layer II 2.0 (stereo) compression
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AC-3 single 5.1 or 2.0 compression (one 5.1 and one 2.0
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encoding simultaneously, or four 2.0 encodings
Dolby E to AC-3 transcoding
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AC-3 metadata input connectors
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MPEG-1 Layer II
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Select up to two pairs from any four groups
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describes the serial connection for this port.
60
Support
a
a
Electra 9200, Rev O
AHC-561 Module
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