Audio Output

ISSUE:

A user with a hearing impairment may not be able to directly access system sounds, warning sounds or other audio indicators. Redundant visual indicators for audio feedback can provide access for users with a range of hearing impairments. A user with a hearing impairment may be able to access audio output by manipulating the volume and/or connecting a hearing aid or other amplification device. Similarly, a user with a visual impairment may wish to manipulate the volume of synthesized speech output to accommodate varied environmental conditions or personal preferences/needs.

STANDARD:

• Provide software access to system sounds (alerts and hardware-generated sounds).



• Provide an option for visual feedback of warning sounds and other audio indicators.



• Flashing visual indicators of system sounds, warning sounds and other audio output shall do so at a frequency of less than twice a second (2 Hz) or greater than 55 times a second (55 Hz) in order to reduce the likelihood of inducing a seizure in users with photo sensitive epilepsy.



• Provide an audio output jack.



• Provide a physical volume control.



• Provide a software volume control.



• Indicate, both visually and tactilely, when the volume is in the off position.