CSS2 听觉参考

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# CSS2 听觉参考

## 听觉样式表

听觉样式表可把语音合成与音响效果相组合，使用户可以听到信息，而无需进行阅读。

听觉呈现可用于：

- 视觉能力低弱的人士
- 帮助用户学习阅读
- 帮助有阅读障碍的用户
- 家庭娱乐
- 在汽车中使用

听觉呈现通常会把文档转化为纯文本，然后传给屏幕阅读器（可读出屏幕上所有字符的一种程序）。

听觉样式表的一个例子：

    h1, h2, h3, h4
    {
    voice-family: male;
    richness: 80;
    cue-before: url("beep.au")
    }

上面的例子可以让语音合成器演奏一段声音，然后用男性的声音读出标题。

## CSS2 听觉参考

W3C : "W3C" 列的数字显示出属性由哪个 CSS 标准定义（CSS1 还是 CSS2）。

属性 | 描述 | 值 | W3C
--- | --- | --- | ---

azimuth

Sets where the sound/voices should come from (horizontally)

- angle
- left-side
- far-left
- left
- center-left
- center
- center-right
- right
- far-right
- right-side
- behind
- leftwards
- rightwards

2

cue

A shorthand property for setting the cue-before and cue-after properties in one declaration

- cue-before
- cue-after

2

cue-after

Specifies a sound to be played after speaking an element's content to delimit it from other

- none
- url

2

cue-before

Specifies a sound to be played before speaking an element's content to delimit it from other

- none
- url

2

elevation

Sets where the sound/voices should come from (vertically)

- angle
- below
- level
- above
- higher
- lower

2

pause

A shorthand property for setting the pause-before and pause-after properties in one declaration

- pause-before
- pause-after

2

pause-after

Specifies a pause after speaking an element's content

- time
- %

2

pause-before

Specifies a pause before speaking an element's content

- time
- %

2

pitch

Specifies the speaking voice

- frequency
- x-low
- low
- medium
- high
- x-high

2

pitch-range

Specifies the variation in the speaking voice. (Monotone voice or animated voice?)

- number

2

play-during

Specifies a sound to be played while speaking an element's content

- auto
- none
- url
- mix
- repeat

2

richness

Specifies the richness in the speaking voice. (Rich voice or thin voice?)

- number

2

speak

Specifies whether content will render aurally

- normal
- none
- spell-out

2

speak-header

Specifies how to handle table headers. Should the headers be spoken before every cell, or only before a cell with a different header than the previous cell

- always
- once

2

speak-numeral

Specifies how to speak numbers

- digits
- continuous

2

speak-punctuation

Specifies how to speak punctuation characters

- none
- code

2

speech-rate

Specifies the speed of the speaking

- number
- x-slow
- slow
- medium
- fast
- x-fast
- faster
- slower

2

stress

Specifies the "stress" in the speaking voice

- number

2

voice-family

A prioritized list of voice family names that contain specific voices

- specific-voice
- generic-voice

2

volume

Specifies the volume of the speaking

- number
- %
- silent
- x-soft
- soft
- medium
- loud
- x-loud

2