Develop Reference

How to control voice balance via C# code

I am developing an application in C#, at some point of the program, I'd like to have control of the speaker, more specifically, I'd like to control the voice balance (which speaker - left/right - the voice is coming from). Is there a way to do this?
Thank you,

It depends on how you are using the audio. If you have a two speaker setup, then all you need to do is to create a sound that only plays on the left or right chanel - depending on your requirements.
I have not done this recently, but a few opensource libraries you could have a look at are:
http://windowsmedianet.sourceforge.net/
http://naudio.codeplex.com/
Also check out the multimedia MSDN entry:
http://msdn.microsoft.com/en-us/library/ms712636(VS.85).aspx
Hope this helps.
Cheers.

Capture Raw Signal from WiFi card as You Would a Sound Card

Is it possible to capture the raw signal from a WiFi card in the same way you can capture the signal from a sound card? (I already found code for working with a sound card and for drawing spectrograms) I'm wondering because it would make a cool radio-type project. I'd prefer a solution that integerates well with .net (VB or C#).
My basic goal is to capture the ambient radio waves and build a primative "telescope" of sorts. Using the built in computer hardware is just the easiest way to accomplish this. If you have any other suggestions about how to accomplish this goal in a different way please post it as an answer also.
Thanks.

Look up "Software Defined Radio". They are usually either radio electronic kits or fairly expensive hardware. You will still need an antenna.

Digital Sound Processing in C# (and possibly SilverLight)

I need to do some basic and non basic DSP programming in C#. At its core, it includes the generation of a sin wave deciding its frequency in Hertz. Then I'd like to Frequency Modulate it and maybe filter it.
Can you suggest any library to help me? Ideally this should also work in a SilverLight environment, as my aim is to showcase a ultra-basic SilverLight synthesizer.
Thanks in advance

You might want to check out a couple of articles by Charles Petzold:
A Simple Silverlight Synthesizer
and
A simple electronice Sequencer in Silverlight
The Oscillator class in the SimpleSequencer project might be what you're looking for.

C# video input routines

Can someone point me towards a good article or tutorial on how to access TV tuner and/or web cams from C#? I looked everywhere and can't seem to find anything relevant.
Thanks

This is normally something that the manufacturer of your video hardware would provide, usually in the form of an SDK.
Depending on what you want to do, this might help:
http://www.codeproject.com/KB/directx/directxcapture.aspx

You might want to look at this question about web cams and DirectShowNet, which is a managed wrapper for the DirectShow component in DirectX.

How can I use speech recognition with C# on Windows XP? + do I need to train every pc that runs the app?

I am making a robot that responds to few voice commands. I am using Windows XP and C# to achieve that. My only problem is that I don't know how to use speech recognition with C#.
I've been searching Google and MSDN, but I did not find any beginner friendly tutorial yet..
Any suggestions??
Also, I know -from my experience with windows' speech recognition in M$ word- that I need to train the computer before starting the speech recognition application. This may cause a big problem for me because I may need to present my robot using different computers/or/different people may be the presenters.
So is there any way to make a predefined list of words that any user can say to the application without having to train it first???
Thanks for help!

Yes, you'll have to train anything that uses pattern recognition to respond to things. In Philadelphia, they pronounce "water" as "wudder". How could an algorithm figure that out? A predefined list would require you to have a working knowledge of every accent in the target sales countries.

SAPI 5.4 in Windows 7 does a very good job of recognizing limited command & control grammars without training.
If you keep your command set (grammar) small (say, no more than 10-15 commands), you should be able to get good results.
Dictation or a large command set requires training; there's just too much uncertainty.