7 votes
Accepted

What's the shortest sound perceptible to the human ear?

According to my copy of the absolutely essential (!) Master Handbook of Acoustics, to hear shorter tones, that is sounds with a short impulse, they need to be louder: A 1,000-Hz tone sounds like 1,...
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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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  • 1,548
5 votes
Accepted

Recording multiple microphones tightly synchronised

Virtually all modern audio interfaces for computer use have clock-synchronized sampling across all inputs. This is a prime requirement for most ordinary multi-track recording. It would be difficult ...
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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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  • 8,394
4 votes
Accepted

What dBFS threshold should I set for differentiation between silence and NOT silence

This question, as stated, is not answerable. The answer is "it depends". What you need to determine is the noise level in the file. Silence is rarely silent, but there is a large difference between ...
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  • 8,081
3 votes

How to improve guitar tone for recording?

In addition to @frcake's excellent answer, I have a few points: I have been gigging for over 30 years and I still have trouble getting some sounds I want. One solution that most guitarists go for is ...
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  • 5,848
3 votes
Accepted

What you need to know to create a software synth?

You need to understand sound sources (oscillators, noise generators, and samples), modulation (LFO in particular), sound shaping (envelopes), and then signal processing (read: math and audio physics). ...
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3 votes

Can a software generate a "midi" track from a song of musical notes of different instruments thanks to some filters?

DJ software like Native Instruments Traktor is pretty good at guessing the tempo by analysing a music track. It can also send out a MIDI clock signal that can be used to sync lights or something to. ...
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  • 2,863
3 votes

What's the shortest sound perceptible to the human ear?

The shortest length of time your eardrum can respond to a given sound depends on its frequency. The higher the frequency, the shorter the response time and the shorter time required for the ear to ...
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  • 31
3 votes

What's the shortest sound perceptible to the human ear?

If you create a soundfile at 44100 Hz with only silence in it, and set exactly one sample to a non-zero value, you will hear the non-zero sample as a click. This is essentially a sound of 0,0227 ms (...
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  • 2,863
3 votes

What's the shortest sound perceptible to the human ear?

There is no shortest sound detectable by the human ear. Any impulse with enough energy is audible. The shortest detectable tone, identifiable as a tone, would be on the order of 100 ms. It might be ...
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3 votes

Which DSP / VST / AU / RTAS external units exists to offload audio processing from internal CPU?

Another option is to look into Sonic Core's products. Originally, the PCI card-based hardware was developed by CreamWare, but Sonic Core acquired them, and developed the Xite series of hardware based ...
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  • 31
3 votes

Can I record a sound frequency I can't hear and play it back so I can hear it?

I would like to expand on the caveat in @Rory Alsop's answer, since to me he answers one part of your question (can I play it back so I can hear it?) while relegating the arguably far less trivial ...
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  • 283
3 votes
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can you combine a high passed signal and low passed signal to get original signal

As long as you have identical rolloff characteristics - slope and frequency, the mix of the two will be identical to the original signal. Whether the filter alters phase or not depends entirely on ...
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  • 8,394
3 votes
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Digitize vinyl on PC (TT > Stereo Amp > USB Audio Interface > PC recording software)

Use the Marantz as your pre-amp. Route the audio out of one of its 'Recorder' outputs. This should give you consumer-level output, nominally -20dB. Input to the Behringer on a switchable input mic/...
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  • 7,039
3 votes

how to separate an audio file based on different speakers

I don't know of anything that will do this automatically - perhaps some advanced broadcast reporter software [Hindenburg springs to mind], but that's outside my area. Many DAWs could do it manually at ...
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  • 7,039
2 votes
Accepted

i need a singer simulator or virtual singer?

if you're still interested you might want to check komponant.com We're creating a technology that does exactly what you're looking for Cheers
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2 votes

i need a singer simulator or virtual singer?

Alter Ego Bones (free) Standalone, VST % AU 64bit - wi;; sing and speak whatever you type in to it, same presets are provided in English and Japanese, there are also add-on voices which are not free. ...
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2 votes

How to do frequency or spectral subtraction of two audio tracks?

In the case where your two audio signals S1[n] and S2[n] are of same length, and we are speaking of discrete time, discrete value signals, the DFT being a linear transform : DFT (S1[n] - S2[n]) = ...
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  • 2,613
2 votes

How to create the muffled sound effect like hearing through walls?

I'm a little late to the party, but I've used ProTools' 7-band EQ plugin for replicating sounds coming from inside of a building, and it sounds great. There are some other things I would do to adjust ...
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  • 21
2 votes

Converting audio recording to numeric values representing how loud the audio is at a given time

You would rather turn to a program like Matlab or its open source equivalent Octave. Open your mono-channel audio data as a vector (using wavread for instance), and turn each sample value to its ...
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2 votes

Mathematically what does phase reverse do on a signal?

In the simplest case, Fourier analysis probably won't help understand this. You can think of it arithmetically. (L - R) subtracts the right channel from the left channel, so as you noted, those parts ...
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  • 1,721
2 votes

Time resolved sound measurment

A microphone usually measure pressure variation or pressure gradient of the acoustic sound wave at the transducer location. That means that the atmospheric pressure (what you possibly call ambient ...
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  • 2,613
2 votes

Combining two clicky copies of the same record into one good recording

Honestly, I think you'd have a much simpler task if you tried some de-clicker software on the best of the pair than attempt to keep two independently-recorded analogue tracks in prefect phase-sync for ...
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  • 7,039
2 votes

How to improve guitar tone for recording?

As a rule of thumb, closer to the center is trebly , closer to the ring is mellower - more bassy. Electric guitar recording is a world of it's own, many people go to insane extends to hunt the tone ...
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  • 1,460
2 votes
Accepted

Audio Signal Difference Extraction

In one sense, the answer from "audionuma" is correct, a similar process is possible in both Ableton and Audacity. In Ableton, all the tools you need to do this are contained in the "Utility" plug-in, ...
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2 votes
Accepted

Is it legitimate to use a low pass filter on short segments of audio around stitch between two amplitude signals to remove noise?

The answer is to be found in understanding what a crossfade is. A crossfade can be either "Constant Level" or "Constant Power". One is linear, one is logarithmic in shape. You need to build a table ...
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  • 8,394
2 votes

Why is this audio obfuscation algorithm not working?

The process you are using is not going to work, as you have a one-to-one mapping of input to output. Any time you do that, patterns exist that relate to the original. This type of algorithm has been ...
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  • 5,848
1 vote

What's the easiest way to utilize the stereo tracks on my Zoom L-12 as microphone inputs?

You might want to read This PreSonus Article But you should be fine to connect a balanced TRS to TS. But are you really needing 10-12 mic inputs? you'd be better off buying a mixer with more inputs. ...
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