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Home >> css >> CSS3 Aural Properties

CSS3 Aural Properties

 

Aural properties defines the aural rendering of a document.

 

Aural Style Sheets

Aural style sheets are the part of CSS that uses a combination of speech synthesis and sound effects to make a web document more accessible to visually impaired and screen readers.

Aural presentation can be used:

  • by blind people
  • in the automobiles
  • in devices like home entertainment
  • industrial and medical documentation systems
  • to help users learning to read or who have difficulty reading

When using aural properties, the canvas consists of a three-dimensional physical space (sound surrounds) and a temporal space (one may specify sounds before, during, and after other sounds). The CSS properties also allow you to vary the quality of synthesized speech (voice type, frequency, inflection, etc.).

An example of an aural style sheet:

Example :

h1, h2, h3, h4, h5, h6 {
    voice-family: male;
    stress: 20;
    richness: 90;
    cue-before: url("pop.au");
}
p {
    azimuth: center-left;
}
quotes {
    volume: x-soft;
}

This will direct the speech synthesizer to speak headers in a very rich male voice (a kind of "audio font").Before speaking the headers; a sound sample will be played from the given URL. 

Paragraphs will appear to come from front left (if the sound system is capable of spatial audio). And quotes will be very soft.

PropertyValues     Description
azimuthangle
left-side
far-left
left
center-left
center
center-right
right
far-right
right-side
behind
leftwards
rightwards
inherit
Sets where the sound should come from horizontally
cuecue-before
cue-after
inherit
Shorthand for setting the cue properties (i.e. cue-before and cue-after) in one declaration.
cue-afternone
url
inherit
Specifies a sound to be played after speaking an element's content to delimit it from other.
cue-beforenone
url
inherit
Specifies a sound to be played before speaking an element's content to delimit it from other.
elevationangle
below
level
above
higher
lower
inherit
Sets where the sound should come from vertically.
pausepause-before
pause-after
inherit
Shorthand for setting the pause properties (i.e. pause-before and pause-after) in one declaration
pause-aftertime
%
inherit
Specify a pause to be observed after speaking an element's content.
pause-beforetime
%
inherit
Specify a pause to be observed before speaking an element's content
pitchfrequency
x-low
low
medium
high
x-high
inherit
Specifies the average pitch (a frequency) of the speaking voice. The average pitch of a voice depends on the voice family.
pitch-rangenumber
inherit
Specifies variation in average pitch.
play-duringauto
none
url
mix
repeat
inherit
Specifies a sound to be played as a background while an element's content is spoken.
richnessnumber
inherit
Specifies the richness of the speaking voice
speaknormal
none
spell-out
inherit
Specifies whether text will be rendered aurally and if so, in what manner
speak-headeralways
once
inherit
Specifies whether table headers are spoken before every cell, or only before a cell when that cell is associated with a different header than the previous cell.
speak-numeraldigits
continuous
inherit
Specifies how numerals are spoken.
speak-punctuationnone
code
inherit
Specifies how punctuation characters are spoken.
speech-ratenumber
x-slow
slow
medium
fast
x-fast
faster
slower
inherit
Specifies the speaking rate i.e. number of words spoken per minute.
Stressnumber
inherit
Specifies the "stress" in the speaking voice.
voice-familyspecific-voice
generic-voice
inherit
Specifies a comma-separated, prioritized list of voice family names.
volumenumber
%
silent
x-soft
soft
medium
loud
x-loud
inherit
 

 

 

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