Laptop reverb

i have a laptop running vista and is a has a built in mic every time i try to record i get some very annoying reverb even with the speakers muted i one installed a virtual line in but then uninstalled it. can any one help. i included a small 3 to demonstrate what happens. i would recomend putting the volume down the piano is soft but the reverb is not

sound.mp3189 KB
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chrischavez (author) 9 years ago
thanks every one i fixed it i dont know what i did though. all i did was click restore to default ant that seemed to fix my problem.
gmoon9 years ago
You're recording from two sources at once--the line in and the mix.
Do as Nacho says--double-click on the system tray speaker, then "Options->Properties" In the Properties box (if your system is like mine), there should be a mixer device choice at the top. Change that to "line in / mic in".

There should be something like a "stereo mix" control visible. Experiment with how that interacts with the line in / mic in sliders.

Depending on the recording program you're using, it's settings may override the system tray settings...

Yes, this is definitely positive feedback (inserting part of the output signal in-phase back into the input.) Positive feedback usually reinforces the signal in a cascade fashion, up to the limits of the amplification / audio system.

It's easiest to think of this in terms of guitar feedback--the "dry" signal from the pickups is fed to an amplifier. That kicks out the same signal at high volume, which vibrates the strings even more (being the same resonant frequency), which is fed back to the pickups, which goes to the amplifier, which vibrates the strings more, and so on, etc., etc., etc. Since the actual bodies of archtop (hollow) guitars are designed to resonate easily with the stings, they usually feedback to an extreme degree.

Conversely, negative feedback (180 degrees out-of-phase) is used to tame oscillations and touchy audio circuits. So positive is bad, negative is good.
NachoMahma9 years ago
. Here's how to do it in XP. Should be similar in Vista. 1) Right-click the speaker icon in the notification area (bottom right corner in XP) and select Open Volume Control (or just double-click on the icon). Or open the Sounds and Audio Devices Control Panel, then click Advanced. 2) Set all unused inputs to zero (or use the mute box).
chrischavez (author)  NachoMahma9 years ago
but i only have one mic input and a speaker if i mute the speaker i still get the reverb. i mute the mic but i cant record
. What you have is feedback, not reverb (an echo type effect). Somehow, the output is being looped back into the input. . You may have to dig pretty deep into your audio config, but, in a nutshell, you want to setup Windows and your audio app so that you don't have any feedback loops. I'd check the inputs first and make sure none of them get their signal from an output.
chrischavez (author)  NachoMahma9 years ago
it only happens when the sound is loud enough but ill check
. caitlinsdad may be right. Still sounds like feedback to me, but I'm no expert (not even close).
Listen to Carlos Santana, that is controlled feedback. Listen to the tone of his guitar. That is distortion. Listen to rap. That is noise. Ok, I'll get burned for that...
. The Truth ain't always pretty.
. <cue Twilight Zone theme music> I've was listening the CS today! Showing my Guatemalan neighbors what real Latin music sounds like. heehee
And I suppose pan-flutes playing the soundtrack selections from "The Graduate" doesn't rock your boat? Be careful if they show you where the real game of soccer came from...heehee.
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