Using PC sound card as a signal source

hi,
i am a university student, and really want to know if
it is possible to using the sound card on a PC as a signal generation source?
i did use labview sound VI to generate a single tone, but the measured signal is not a sine waveform,the negtive period is missing.
is there anybody can help me? thanks!

Dear Jianshi,
Attached is a link that you might find interesting:
http://digital.ni.com/public.nsf/websearch/4A62AC2DB5BDDB3E86256E12003755C2?OpenDocument
Kind Regards
LouisP
Applications Engineer
NI-UK

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