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Message definition (Sound Problems)

==Understanding sound==
In order to understand KDE sound, you have to understand Linux sound (this chapter assumes you are running your KDE on Linux). There are two types of sound systems that run on Linux: [http://en.wikipedia.org/wiki/Advanced_Linux_Sound_Architecture ''ALSA''] and [http://en.wikipedia.org/wiki/Open_Sound_System ''OSS'']. Both provide their own sound card drivers. ALSA only runs on Linux, OSS runs on many UNIX systems. ALSA allows several applications to access the sound card at the same time, OSS does not. OSS provides a device for sound output. This device can only be accessed by one application at a time. To decrease confusion, ALSA emulates OSS and also provides a device as interface to the sound card. As well ALSA as OSS calls the device for the sound card /dev/dsp usually. '''PulseAudio''', in some distros, provides another layer above these. Its job is to handle multiple streams, so that, for instance, you can receive a message notification at the same time as listening to music.

理解音效

為了理解KDE的音效，你必須了解Linux聲音系統（這個章節假定你是在Linux上跑KDE）。有兩種類型的聲音系統運行在Linux上： ALSA和OSS。兩者都提供他們自己的聲卡驅動。 ALSA只能在Linux上用，OSS可以在多種UNIX系統上用。 ALSA允許多個程序同時訪問聲卡，OSS 不行。 OSS提供一個設備來輸出聲音。這個設備在一個時間只能被一個程序訪問。為了減少混亂，ALSA模擬了OSS，也提供一個設備作為聲卡的接口。通常ALSA和OSS一樣將聲卡的設備命名為/dev/dsp。在某些發行版中用的PulseAudio，提供了上述那些之上的另一層（layer）。它的任務是處理多個音頻流，以便，舉個例子，你可以在聽音樂的同時接受到消息通知。