SOS:sound card operation

[Yuki_jin]

Dear All:

I want to design an audio circuit test program using CVI.

Two sound card (PCI) are installed in my computer,one is used to generate sine wave to audio circuit Mic port,the other is the feedback input port from SPK port of the audio circuit.

The program should implement three basic function:

1. generate sine wave to Sound card No.1;
2. display the feedback input wave from Sound card No.2;
3. audio analyse(frequency calcu, Signal-to-Noise calcu)

I am puzzled with the following questions:

A. How can I access the sound card?

B. Which function can be used for audio analysis?

Thanks!

Yuki

[Yuki_jin]

Dear :

   I creat the sample "generate sound .vi"  as DLL file.The I invoke it in my CVI program.It does work and can generate sound but the interface can be not displayed(wave in the vi).

   Who can tell me why?

   Thanks

   Yuki