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9 votes
Accepted

USB input high-pitched whine

That is the result of bad isolation of either the DAC or the ADC. If the internal circuitry of the interface and the actual capture or playback circuitry share a common power supply, the operation of ...
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  • 8,091
7 votes

Why early films had crackling noises in background?

I'd be inclined to think it would be from scratches/dust in the optical medium that sound was carried on in cinema film, up until 1976. See this image from Wikipedia… Edge of a 35mm film print ...
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  • 7,199
6 votes

Why do some audio amps use AC while others use DC

Is AC current fundamentally better as a working current when it comes to amplifying audio signal? No. If anything, using an AC power supply makes it more difficult to have low noise. The circuits ...
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  • 1,558
5 votes

Can noise be reduced by 7 decibels with a curtain?

They missed out one vital piece of information - at what frequencies? They'd need to be made of lead to stop anything below 100Hz… I wonder whether their mosquito-repellant curtains work when they'...
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  • 7,199
5 votes

How can I make a voice in the background come to the foreground and remove foreground noise?

Short, honest answer: nope, forget it. In principle it's possible nowadays to separate any part of a signal, using software like iZotope RX or the (rather dated, by now) Algorithmix Renovator. These ...
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5 votes
Accepted

Why do some audio amps use AC while others use DC

The type of current is actually completely irrelevant as all transmitted power is AC. Unless you are driving your amplifier from batteries, everything has to be converted at some point to DC. The end ...
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  • 8,484
4 votes

Do XLR cables wear out?

Yes, they do wear out eventually. As pointed out already, the life time depends greatly on use and quality. Even with a cable that seemingly works sound quality may get drastically reduced. See below. ...
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4 votes

Best sound to use for ringtone

I used to have a tone sweep from one of the convolution plug ins as my ring tone. It worked really well because it was a chirp, followed by a few seconds of silence, and then a tone sweep low to high. ...
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4 votes

Reducing noise and crackling from wires

Balancing! All your lines should be balanced. What this does it splits the signal in two and flips one half of it. Then the side that is flipped is flipped back at the end, and added to the first one, ...
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4 votes

How to remove repetitive (air compressor) noise from audio?

Izotope rx is the industry standard. But any fingerprint style noise reduction should be able to improve it.
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  • 1,304
4 votes
Accepted

Faking depth and stereo separation?

It depends on what you mean by “cleaner” really. Is this a professional or amateur recording? If you just want to improve the recording, then there are many things you can try. EQing to get a better ...
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  • 2,176
4 votes

Isolate a subwoofer from the floor below

How much money have you got to spend & would you consider replacing the floor entirely with a new one made of solid concrete, not connected to the current walls or floor? That is not as frivolous ...
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  • 7,199
3 votes

Why would I get background noise but only in the negative cycles? (on CAD U1 USB mic)

That looks like one of the most severe cases of DC Offset I've ever seen. I can't really make out the scale, but it looks pretty out-zoomed to me, and if so, I would return that card if I were you. It ...
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3 votes

Assigning a numerical value to clarity

You should look into feature extraction from audio signals. Audio is being analyzed, as a result you get numerical values that more or less correspond to the perceived qualities of the sound. The ...
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3 votes

How to fix loud thunderous noise from Peavey PA system?

This is most likely an issue related to microphone cable, connectors or wireless receiver. Try the following to determine the source of the error: Test amplifier Connect amp and speakers only - NO ...
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3 votes

Remove hiss from audio

To fully discard the option of the method you tried make sure that before you invert the phase of the left channel you bring both channels to the center field; then you invert the phase and judge if ...
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3 votes

Why is there noise in my spectrum analyser despite having no external devices plugged in?

All audio electronics create noise, including your interface itself. It's actually pretty good that the self noise of the interface is at around -100 dB. Even when all other sources of noise are ...
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  • 2,040
3 votes

Noise in usb audio interface?

This could be a variety of things but there are a few things you can do to trouble shoot. Ensure that everything is plugged into the same outlet. In some cases crossed grounding can cause buzzing if ...
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  • 1,000
3 votes

What is the best way to reduce background noise on a video recorded with a camcorder (background chatter)?

There are automated algorithms like those you tried in iMovie, the ones in Audacity might be worth a try but if you want better results you should individually edit phrases. Software like izotope RX ...
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  • 844
3 votes
Accepted

Denoising studio induced noise and noise due to poor recording

Firstly, do any and all processing in WAV files. If your source material is on CD, then rip to 44.1kHz/16bit WAV and process at 24-bit in your software. Do not transcode via mp3. Tracks like 104b ...
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  • 8,484
3 votes

Is it possible to remove a whistle-like noise from audio?

A very High-Q notch EQ filter can do the trick, although I would probably recommend spectral cleaning to nail this. Izotope RX Advanced Spectral Cleaner is the way to go.
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  • 8,484
3 votes
Accepted

Does DC translate to sound?

Sound is derived from vibrations which in turn are generated or represented by changing current levels. Sound can never be derived from a static voltage or current. Your statement that "DC should ...
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  • 8,484
3 votes
Accepted

What is causing the 5.5 kHz noise in my recording setup

This is a broad sweep at the issue, some guesswork & experimentation required. First of all, if you have an alternative DAC try it, no matter how basic, just to eliminate the simplest explanation....
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  • 7,199
2 votes

There is static when I export video where there is none in editing (premiere pro)

I realize this comes a bit late, but what the heck.... I've run into this same phenomenon. What's happening is a natural result of using the Denoiser audio plug-in in Adobe Premiere. Unfortunately, ...
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2 votes

Fix for terrible "Hard Drive Noise" Audio Interference?

Have you considered investing in a power conditioner? They are used in most studios and also live venues. It's basically like a rack mounted power bar, but it does so much more than just basic surge ...
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  • 465
2 votes

USB input high-pitched whine

I have the exact same interface and was hearing the exact same noise, except it was not there when I bought the interface. It does seem to be a power-supply-related problem, turns out the noise only ...
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2 votes

Who makes the quietest microphone?!

https://www.lewitt-audio.com/microphones/lct-recording/lct-540-subzero The Lewitt LCT540 has the quietest specs I've seen available in a commercial mic.
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2 votes

Assigning a numerical value to clarity

Welcome to SD. Yes you could, but if you want to go past just a subjective grading (ie you just guess at how clear a sound is and note it down for the file) then the system can become complex very ...
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  • 4,465
2 votes

obviate extreme gain noise

I've no experience with this type of gear, but functionality depends on the use-case. This device (and there are several others available with similar function) is mostly useful on ribbon and dynamic ...
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  • 2,906
2 votes

Why would I get background noise but only in the negative cycles? (on CAD U1 USB mic)

I think it's just broken. I've seen this on an AKG C451 before which needed to be repaired. It's probably something wrong with the electronics as it is impossible for the capsule to move in this way. ...
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  • 4,465

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