C# - getting outbound sound data from sound card

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Hey guys!

I've found loads of useful posts regarding recording sound data from a microphone but can't seem to find anything on how to get what you hear from the sound card.

Basically what I'm trying to make is:
a program that visualizes the output sound that you actually hear coming from the sound card.
I'm planning to use Jeff Morton's "Sound visualizer in C#" as a base for the visualization. By the way this program doesn't seem to work on my computer, still need to figure that out...

Thank you ahead,
Gabor

Posted 8-Mar-11 8:53am

Nagamo

Updated 8-Mar-11 9:34am

wizardzz

v2

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OriginalGriff 8-Mar-11 14:58pm

And your question is?

LloydA111 8-Mar-11 15:14pm

You mean speech recognition?

wizardzz 8-Mar-11 15:32pm

I figured it out. He wants something to capture (for analysis) the outbound sound coming from the sound card to visualize. His wording it as the opposite of recording is confusing.

Sergey Alexandrovich Kryukov 8-Mar-11 16:15pm

It was my guess, to, but I afraid to ask ...:-)
--SA

fjdiewornncalwe 8-Mar-11 15:55pm

The OP is referring to http://www.codeproject.com/KB/audio-video/SoundViewer.aspx
Perhaps you could ask on that article's Comments and Discussions section. If you post there, the author of the article will see your question and you may be able to get an answer from him directly.

Sergey Alexandrovich Kryukov 8-Mar-11 16:20pm

How could I up-vote this? It would make some answer, but I'm not sure data acquisition from sound card is covered...
--SA

Nagamo 8-Mar-11 16:24pm

Yes my question is regarding the outbound sound information. I'd like to display the sound waves in real time. So basically my question is: how can I access information regarding the current, real-time sound frequency and amplitude. Under sound I mean what you can hear coming from the speakers (NOT the microphone).
I'm sorry if my post was confusing.

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Eduard Keilholz · Accepted Answer · 2011-03-09T20:59:00

You may want to check out Filters. A filter is part of a codec (coder / decoder) which enables you to 'break' into the entire sequence your machine uses to get sound from the very first source, to your speakers.

To understand this better you may want to download 'GraphEdit' and render an audio file (for example a mp3 file). Graphedit will show the filters used to decode the mp3 and finally get the audio to your speakers.

In your code, you'll be able to add / remove filters and the connections inbetween. Your filter analyses the audio and passes the audio to the speakers. Then wat it does with the analysed audio is up to you!

I bet you'll find some examples in the DirectX SDK!

Good luck!

Eduard