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				[學習筆記] CSS2 聽覺參考
			
            
 			Posted on 2011-05-28 21:24 RTY 閱讀(218) 評論(0)  編輯 收藏 引用  所屬分類: CSS 
			
			


		
            
		
            聽覺樣式表
            聽覺樣式表可把語音合成與音響效果相組合，使用戶可以聽到信息，而無需進行閱讀。
            聽覺呈現可用于：
            • 視覺能力低弱的人士
            • 幫助用戶學習閱讀
            • 幫助有閱讀障礙的用戶
            • 家庭娛樂
            • 在汽車中使用
            聽覺呈現通常會把文檔轉化為純文本，然后傳給屏幕閱讀器（可讀出屏幕上所有字符的一種程序）。
            聽覺樣式表的一個例子：
            h1, h2, h3, h4 { voice-family: male; richness: 80; cue-before: url("beep.au") } 
            上面的例子可以讓語音合成器演奏一段聲音，然后用男性的聲音讀出標題。
            CSS2 聽覺參考
            W3C : "W3C" 列的數字顯示出屬性由哪個 CSS 標準定義（CSS1 還是 CSS2）。
            屬性描述值W3C
            azimuthSets 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
            cueA shorthand property for setting the cue-before and cue-after properties in one declaration
            • cue-before
            • cue-after
            		2
            cue-afterSpecifies a sound to be played after speaking an element's content to delimit it from other
            • none
            • url
            		2
            cue-beforeSpecifies a sound to be played before speaking an element's content to delimit it from other
            • none
            • url
            		2
            elevationSets where the sound/voices should come from (vertically)
            • angle
            • below
            • level
            • above
            • higher
            • lower 
            		2
            pauseA shorthand property for setting the pause-before and pause-after properties in one declaration
            • pause-before
            • pause-after
            		2
            pause-afterSpecifies a pause after speaking an element's content
            • time
            • %
            		2
            pause-beforeSpecifies a pause before speaking an element's content
            • time
            • %
            		2
            pitchSpecifies the speaking voice
            • frequency
            • x-low
            • low
            • medium
            • high
            • x-high 
            		2
            pitch-rangeSpecifies the variation in the speaking voice. (Monotone voice or animated voice?)
            • number
            		2
            play-duringSpecifies a sound to be played while speaking an element's content
            • auto
            • none
            • url
            • mix
            • repeat
            		2
            richnessSpecifies the richness in the speaking voice. (Rich voice or thin voice?)
            • number
            		2
            speakSpecifies whether content will render aurally
            • normal
            • none
            • spell-out
            		2
            speak-headerSpecifies 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-numeralSpecifies how to speak numbers
            • digits
            • continuous
            		2
            speak-punctuationSpecifies how to speak punctuation characters
            • none
            • code
            		2
            speech-rateSpecifies the speed of the speaking
            • number
            • x-slow
            • slow
            • medium
            • fast
            • x-fast
            • faster
            • slower 
            		2
            stressSpecifies the "stress" in the speaking voice
            • number
            		2
            voice-familyA prioritized list of voice family names that contain specific voices
            • specific-voice
            • generic-voice
            		2
            volumeSpecifies the volume of the speaking
            • number
            • %
            • silent
            • x-soft
            • soft
            • medium
            • loud
            • x-loud 
            		2
            
	
            


            
	    
    




            






            

				
			
            
		            		
	
            
	
            
		
			


		
	
            

            

    
    







            
	   
	



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