Test Case sc1.4.6_l3_022: Audio contrast: adequate audio contrast

Formal Metadata

Formal Metadata
TitleAudio contrast: adequate audio contrast
DescriptionDocument containing a link to an audio file with foreground speaker and background sound. The foreground speaker is louder than the background sound.
CreatorBenToWeb (Daniela.Ortner@…)
RightsCopyright BenToWeb 2005-2007
LanguageEnglish
Date2005-08-17
Statusaccepted for end user evaluation

Technologies and Features

Technologies are markup languages or data formats. If the technology is a markup language, “features” refers to elements and attributes.

XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)

XHTML™ 1.0 The Extensible HyperText Markup Language (Second Edition)

Test Data

Purpose

The document is intended to pass, because the foreground audio content is understandable. Only the individual perception of the audio contrast is tested here.

Test Modes

Three or more accessibility experts.

Test Files

Test file.

TCDL Data

sc1.4.6_l3_022 (XML).

Rules

“Rules” refer to success criteria in WCAG 2.0, checkpoints in WCAG 1.0 and similar requirements.

Primary Rules

The test case passes (line 9, column 33) the following success criterion: http://www.w3.org/TR/2007/WD-WCAG20-20070517/Overview.html#visual-audio-contrast-noaudio.

Functional Outcome

Background sound is 20dB lower than foreground speaker.

Technical Comment

One audio file, with foreground speaker and background noise.

This test case maps to technique G56: Mixing audio files so that non-speech sounds are at least 20 decibels lower than the speech audio content.

Secondary Rules

Secondary Rule (WCAG 2.0 - April 2006 Working Draft (Last Call))

The test case passes (line 9, column 33) the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20060427/guidelines.html#visual-audio-contrast-noaudio.

Functional Outcome

Background sound is 20dB lower than foreground speaker. (The test case needs further testing.)

Technical Comment

One audio file, with foreground speaker and background noise.

Online version: sc1.4.4_l3_002.

Secondary Rule (WCAG 2.0 - June 2005 Working Draft)

The test case passes (line 9, column 36) the following success criterion: http://www.w3.org/TR/2006/WD-WCAG20-20050630/#visual-audio-contrast-noaudio.

Functional Outcome

Background sound is 20dB lower than foreground speaker.

Technical Comment

One audio file, with foreground speaker and background noise.