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Audio Decoding

Audio Decoding
Audio Channels
  • 2 Analog audio per blade
  • SDI Embedded audio (4 or 8 audio pairs) per output port
  • HDMI Embedded audio pairs per blade

Note

When the decoder is licensed for one channel only, it mirrors the decoded stream to all interfaces and supports up to eight (8) channel pairs of AAC-LC or AC-3 audio decoding for a stream.

MPEG-2 TS streams received containing AC-3 audio will be down-mixed to a stereo pair for output on the HDMI and SDI interface.

See “Audio Channel Details/Breakout” below.

Audio Bit Rates
  • Mono: From 56 to 160 kbps per audio pair
  • Stereo: From 80 to 320 kbps per audio pair
Frequency ResponseFrom 20 Hz to 22 kHz
Sampling Rate48kHz
Maximum Analog Audio Output LevelFrom +5dBu to +20dBu (balanced or unbalanced) (+6dBu = default)
Compression Standards
  • MPEG-2 AAC-LC / ADTS ISO/IEC 13818-7
  • MPEG-4 AAC-LC / LATM ISO/IEC 14496-3
  • MPEG1 Layer 1/2/3 (ISO/IEC 11172-3)
  • AC-3 (as per ATSC A/52)
Audio Channel Details/Breakout
Analog Audio
Single Channel

Analog audio can select any channel pair in a stream up to the eighth pair:

  • SDI1ch1&2, SDI1ch3&4, SDI1ch5&6, SDI1ch7&8, SDI1ch9&10, SDI1ch11&12, SDI1ch13&14, SDI1ch15&16
Dual Channel

Analog audio can select from the first 4 channel pairs of either SDI interface:

  • SDI1ch1&2, SDI1ch3&4, SDI1ch5&6, SDI1ch7&8
  • SDI2ch1&2, SDI2ch3&4, SDI2ch5&6, SDI2ch7&8
HDMI Embedded Audio
Single Channel

HDMI embedded audio can select either a single channel pair or a set of four channel pairs when in surround sound:

Single Pair:

  • SDI1ch1&2, SDI1ch3&4, … SDI2ch15&16

Surround Sound uses up to 4 channel pairs from:

  • SDI1
Dual Channel

Single Pair:

  • SDI1ch1&2, SDI1ch3&4, … SDI1ch7&8
  • SDI2ch1&2, SDI2ch3&4, … SDI2ch7&8

Surround Sound uses up to 4 channel pairs from:

  • SDI1 or SDI2
SDI Embedded Audio
Single Channel

Supports up to 16 channels (8 channel pairs) of embedded audio on the SDI interface:

  • SDI1ch1&2, SDI1ch3&4, … SDI2ch15&16
Dual Channel

Supports up to 8 channels (4 channel pairs) of embedded audio per SDI interface:

  • SDI1ch1&2, SDI1ch3&4, SDI1ch5&6, SDI1ch7&8
  • SDI2ch1&2, SDI2ch3&4, SDI2ch5&6, SDI2ch7&8

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