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20 votes
Accepted

What audio formats and codecs are used for YouTube videos?

Your best bet is to see what formats youtube-dl returns by running at a command-line, youtube-dl -F URL which will produce output looking like this format code extension resolution note 249 ...
Gyan's user avatar
  • 694
15 votes

How to recover audio from an incomplete or corrupted AAC/m4a file

This guide worked 100% for me - it takes you through each step. Afterwards, the m4a file plays! Note: this is completely free. http://sysfrontier.com/en/2014/12/31/hello-world/ Also pasting ...
namford's user avatar
  • 251
14 votes
Accepted

Show the differences between two similar audio files using graphical method

When no specific feature is to be observed in sound, the best way to represent it is to display its spectrogram since it reflects what the ear does: measuring energy among frequencies as its varies ...
maxime.bochon's user avatar
9 votes

What does 100Hz 12dB per octave mean?

There are three parameters of this filter that are described in the phrase "100 Hz 12 dB per octave low pass filter". I'll cover them in reverse order. Low pass filter - This means the filter does ...
Todd Wilcox's user avatar
  • 2,290
5 votes

Fixing distortion and low fidelity on a re-recorded audio cassette

Nothing posted by Schizomorph is wrong - if it's busted, it's busted... However, one small ray of light is azimuth/stereo balance correction in software. Back in the old days I had a bit of freeware (...
Tetsujin's user avatar
  • 8,701
5 votes
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Is there any application that can generate waveform and sine waves of audio files?

I am an engineering student my self and I use Audacity to generate Sine, Sawtooth, Square waves. It's easy as pie. Download Audacity from here. Open Audacity and click on Generate from the Toolbar on ...
Aniruddha Bera's user avatar
5 votes
Accepted

Which acoustic spectogram shows higher quality of audio file?

What you are asking is impossible to determine from a spectrogram. Spectrograms indicate frequencies present, not the quality of the audio. There may be loss of fine detail in one that would barely ...
AJ Henderson's user avatar
  • 8,182
4 votes

How to deal with clipping in important data

First of all, let's examine what happens when a signal clips: An audio signal can be represented by a string of numbers, so let's say you wan't to record this signal: 0 0.5 1.0 1.2 1.0 0.5 ...
Christian's user avatar
4 votes

Show the differences between two similar audio files using graphical method

Sonic Lineup is a very nice interactive GUI tool for comparing two (or more!) audio files. It's open-source, cross-platform (Windows/Linux/Mac), written in C++ and Qt, and it automatically aligns each ...
Denilson Sá Maia's user avatar
4 votes
Accepted

What is the name of this kind of audio connector?

They are called Philips "Easy-fit" speaker connectors. They are a proprietary feature and a p.i.t.a. ;) Here's an article on how to replace them. And here's a listing for replacement parts on eBay. ...
Luke's user avatar
  • 156
4 votes

3.5 mm adaptor shortages/poor connection?

Listen mate, if you are having a problem with every single 3.5mm adapter you have purchased, it's probably the socket.
Mark's user avatar
  • 8,900
4 votes

What's the name for the type of x-axis scale used in frequency graphs?

It's a Logarithmic scale & is used where a linear scale wouldn't really make sense & would reduce the detail in the lower portions of the graph. As each octave doubles the frequency. The ...
Tetsujin's user avatar
  • 8,701
4 votes

Fixing distortion and low fidelity on a re-recorded audio cassette

I'm afraid you can't re-construct information (in the waveform) that has been distorted. The one side you can improve is playback quality by using a decent tape player with a good head. Tape ...
Schizomorph's user avatar
  • 1,573
4 votes

Is there any application that can generate waveform and sine waves of audio files?

Any DAW (digital audio workstation) or even most video editing software will display a waveform for the audio in a particular file. You can not, however, make a "sine wave of whatever audio file" ...
AJ Henderson's user avatar
  • 8,182
4 votes

Is there any application that can generate waveform and sine waves of audio files?

You may want to check out SPEAR. From the website: SPEAR is an application for audio analysis, editing and synthesis. The analysis procedure (which is based on the traditional McAulay-Quatieri ...
Jay Jennings's user avatar
  • 15.5k
4 votes

Why do MP3 files have a sample rate? (When they are just composed of sine waves)

Digital sound files are not made up of sine waves - You may be thinking of FM or West Coast synthesis where sine waves are used to modulate other sine waves to generate more complex waveforms. You ...
7HzResearch's user avatar
3 votes

Sending PC audio through mixer sounds messed up

I know I'm a little late here, but I just ran into the same problem and was trying to find a solution. It turns out that I was pumping a stereo signal into a mono input and then listen to the stereo ...
Adam's user avatar
  • 31
3 votes
Accepted

Removing vocals using multiple versions of the same song

If the vocals are in different languages then no, there is nothing that can be done to cancel them out automatically. If the different lyrics have gaps in different places then you could manually ...
Rory Alsop's user avatar
  • 6,063
3 votes
Accepted

Confusing choice of audio-production PC

You really just need the best of everything you can afford - as an extreme example, marrying a dual 6-core Xeon to 2GB RAM & a 64GB 4200 rpm drive would be rather a waste. Very very broadly... ...
Tetsujin's user avatar
  • 8,701
3 votes

What is "Pilot mode" in wireless systems?

Both conventional, carrier-strength squelch and pilot-tone type squelch are used to mute the signal when the connection is compromised. But the pilot-tone method has the advantage that it gates only ...
Richard Crowley's user avatar
3 votes

Crossing stereo and mono cables between multiple instruments

This is a bad idea, not least of all because you won't be able to balance the instruments and piano properly. What kind of stereo mixer has only two inputs all in all? That's not a mixer, it's a ...
user21054's user avatar
3 votes
Accepted

Removing ground hum safely

Only use balanced audio connections between several devices with their own power supply and grounding. If you are using decent equipment, chances are that they already have balanced line input/...
user21078's user avatar
3 votes

How do I fix bass on earbuds and speakers?

This is why studio monitors used in recording produce neutral sound as close to 1:1 as possible. Consumer audio gear, either because of being cheap or because of being intentionally biased, have a ...
AJ Henderson's user avatar
  • 8,182
3 votes
Accepted

What is the common solution and terminology for "smoothing out" a waveform?

A comb filter is a specific type of filter which operates by adding a delayed version of the signal back to itself. The frequency response has a repeating pattern of notches or spikes, like a comb, ...
Zalman Stern's user avatar
3 votes
Accepted

How to get number of Frames(or Samples) per sec or ms in a audio (.wav or .mp3) file?

The bit depth in your case is 16. It refers to how large each sample is, so if you have a 16 bit value for each sample, that is your bit depth. Bit rate is a measure of data per second (as I think ...
Igid's user avatar
  • 293
3 votes
Accepted

How to create an audio file from a spectrogram?

You can use Coagula. I believe it is the same software Aphex Twin used in Windowlicker.
Schizomorph's user avatar
  • 1,573
3 votes

Audio callback and multiple threads

Yes, audio software, be it a DAW or a live mixing console, do use multithreading and multicore functionality. Example 1 : Pyramix MassCore technology “hides” one or more cores in a multiple CPU ...
audionuma's user avatar
  • 2,864
3 votes
Accepted

How can these wav/mpeg files be the exact same duration—down to the (apparent) millionth of a second?

Digital audio is sampled i.e. made up of discrete chunks, with each chunk representing a small sliver of time. So the duration will be quantized to multiples of 1/sampling frequency i.e. if sampling ...
Gyan's user avatar
  • 694

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