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OGCIO

Level AAA − WCAG 2.0 Success Criterion 1.4.7 − Low or No Background Audio

Ideally, do not place background sounds in audio clips.  If this cannot be avoided, provide a clearly labelled function to enable the user to turn the audio off and ensure the foreground sound is approximately four times as loud as the background sound.

Before Rectification

A webpage sample containing a video recording with a background audio on the website.

The background audio has a high chance of overpowering the actual dialogue. This becomes an issue for persons with hearing impairments.

After Rectification

A webpage sample containing a video recording with no background audio.

An effort should be made to reduce the background sound as much as possible. At the bare minimum, make sure that if a background sound does exist, it is four times as quiet as the foreground sound/dialogue.

WCAG 2.0 Reference:

http://www.w3.org/TR/UNDERSTANDING-WCAG20/visual-audio-contrast-noaudio.html