Microphone input

Code a windows form, using a Timer to check the microphone, and display the current amplitude (volume) of sound incoming, displayed like a graphic equalizer with a single column. <[login to view URL]>. Add a slider control to set a user- adjustable sound threshold. When the incoming microphone sound volume exceeds the threshold, make a text caption change from saying "its quiet" to "its noisy", and back again when volume drops below the threshold. I also desire the option, controlled with a checkbox on/off, to put the incoming microphone sound through a FFT (fast fourier transform) algorithm, to get a breakdown of the power of sound in various frequency ranges, to be displayed in a multi-column graphic equalizer graphical scheme on the windows form. When using the FFT for frequency bands, I'd like to be able to use 1 band in the range of 200 to 600 Hz to test against the threshold. These sample codes might help: <[login to view URL]> <[login to view URL]> My goal is software that listens to the microphone to determine if I'm talking to someone in my office, or on the phone, or not. And if it is quiet, then my PC can go ahead do other stuff when 'its quiet'. You can get it working in any language, but my preference is non-OOP. I will take your source code, and post a separate project to convert it into VB6. If you can do this, but don't like the budget, I'll also offer it later as a pay-for-time project, if you have experience with the sound APIs and know what a FFT outputs. ## Deliverables This project was initially accepted and worked-on by another coder, who seemed to be doing well, but then disappeared and missed the deadline. From my discussions with that coder, he/she had offered to code a DLL, and show me how to call it from a VB6 test app. That will be a helpful part of this project now. If you choose to code in object-oriented style, (which I hate), try to make it look procedural-style, with the early initialization code near the top of the source-code file. For visual appearance, the sound bars area showing amplitude, and the threshold slider, should be equal length and parallel to each other. The frequency band from the FFT doesn't need to be exactly 200 to 600 Hz. The sample size for the FFT can try 8192 or 4096 to see if that is sufficient. I'd like this to be able to work on winXP, and vista and win 7, and apparently that means it needs Wasapi support, and using DirectSound. ( I have code that can detect which OS is being used.)