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HTML5 AAC Audio Playback Tests - xHE-AAC

Fraunhofer Institute for Integrated Circuits

xHE-AAC Channel ID

This tests for proper reproduction of the xHE-AAC bitstream and proper channel arrangement.

This bitstream contains:

  • EBU R49 Channel ID:
    • 1 kHz -18 dBFS tone in both channels, left channel interrupted.
  • Spoken Channel Identification (English)
  • Narration: L+R Channels

AOT 42 (xHE-AAC / USAC)

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Special test version, signalled in HTML5 as AOT 2

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Original Wave File

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The MPEG-4 xHE-AAC audio bitstream is presented as an HTML5 audio object - which should play back correctly in:

  • Android P browsers

Other combinations of browsers and platforms may work as well, an omission here does not mean it does not work.

xHE-AAC Reference Level

This provides a reference level for harmonizing playback loudness or monitoring level with other content. It is consistent with the AES 71-2018 "Recommended Practice: Loudness Guidelines for Over the Top Television and Online Video Distribution". Note that the actual playback level from an xHE-AAC decoder will depend on the decoder target level selected for the decoder or playback device.

This bitstream contains:

  • Meter Set Tone:
    • 1000 Hz tone -24 dB FS RMS, 10 seconds
  • Reference Level Noise:
    • 500Hz to 2 KHz pink noise -21.4 dbFS RMS (-24 LKFS) 60 seconds

AOT 42 (xHE-AAC / USAC)

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Original Wave File

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Audio/Video Synchronization (Lip Sync) Test Signal

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This test signal tests for proper synchronization of the audio with video content. If the playback signal chain is correctly aligned, the audio tone will be heard as the white bar crosses the "0" mark in the video.