5 votes

Options for unmixing sounds (source separation)?

Quick answer - No I haven't heard of any but I've heard about research being done on the field. The greatest theoretical problem with de-mixing is knowing what to subtract. When we mix, we add A and ...
  • 1,553
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 ...
  • 8,091
4 votes

Are there any VST audio to MIDI plugins?

Audio To Midi - Free plugin by Mind The Pressure. Translates audio to midi signal directly so it can be hooked up with any virtual instrument (direct download) WIDI Audio to MIDI - Not free. ...
3 votes
Accepted

How can resynthesis engines be so accurate despite the time/frequency resolution trade-offs inherent in Fourier analysis?

I just had a look at Harmor and I'm assuming your question is "How can resynthesis engines be so accurate at RECONSTRUCTING SOUND despite the time/frequency resolution trade-offs inherent in Fourier ...
  • 206
2 votes

Which spectrogram shows higher quality of the song?

You are barking up completely the wrong tree. This is sound. We don't hear sound with our eyes, we listen with our ears. You cannot tell whether a sound is "better quality" than another sound by ...
  • 8,538
2 votes
Accepted

Which spectrogram shows higher quality of the song?

The upper one is definitey the better one. Spectrograms (like the ones you produced with Spek) are used to display and inspect tendencies over time. For example if some noisy signal is present all ...
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 ...
2 votes

Which acoustic spectogram shows higher quality of audio file?

Best audio quality is difficult to assess objectively. What you can say from the given audiograms is (as you mentioned) that N° 3 includes more high frequencies, which is usually considered better. ...
  • 2,743
2 votes

Options for unmixing sounds (source separation)?

In concurrence with other answers; generally "not really feasible" is the answer. I've had a play with iZotope RX5, a very interesting editor; draws the signal as a 2D frequency graph and has tools ...
2 votes

Options for unmixing sounds (source separation)?

There's actually one software company that claims to provide credible unmixing : audionamix. I am not affiliated with them, neither can I confirm their claims but there are demos on their website.
  • 2,743
2 votes

MP3 Psychoacoustic Cut-off Frequencies for Low-Bitrate Presets

Here is a tentative answer based on the 192kHz 24-bit Japanese female speech sample: First I generate the test files from the sample file, sample02.wav: for br in 8 16 24 32 40 48 56 64 80; do ...
  • 131
2 votes

Waveform comparision, similarity detection software?

Essentia is an Open-source library and tools for audio and music analysis, description and synthesis It includes some pre-built extractors that you can use.
  • 2,743
2 votes

How can I automate finding bass distortion in improperly processed files?

Here is my understanding of your problem: You have a set of recorded audio files stored using a lossless audio format. I will assume that no saturation/clipping occured during the recording process, ...
1 vote

Need help in filtering

There are several ways you could approach this, and you will likely need to use a mixture of different techniques to get the best result. This sounds like an exercise in forensics rather than a quest ...
1 vote

Dimensionality reduction for visualization purposes - "Sound map"

For dimensionality reduction you need features to start with. You can for example extract MFCC’s or some other low-level features such as MPEG-7 descriptors. Then you can visualise them using PCA. TBH ...
  • 299
1 vote

Pitch analysis in Audacity

Take a look at Praat which has spectral and pitch analysis built in. Here is a video explaining how this is done.
  • 8,538
1 vote
Accepted

What would cause a recording to have a completely symmetric frequency plot?

According to this spectral output you are not dealing with 48kHz sampled audio. For some reason the audio has been decimated and the actual sampling rate is 24kHz. Consequently the 'nyquist' frequency ...
  • 8,538
1 vote

Audio spectrum analysis: PC Software vs Hardware Spectrum Analyzer

You can obtain very accurate audio spectrum analysis with a software analyzer. You must nevertheless be aware of the potential distortion brought by your acquisition chain (microphone + preamp) and ...
  • 2,743
1 vote

Automating soundcheck: Can I get volume of an instrument from a live band audio GIVEN that I recorded the live mic input?

It depends on the quality of the recording/venue/PA. The basic technique you use here is echo cancellation like that used in mobile phones: you try subtracting a filtered version of the original ...
1 vote

Automating soundcheck: Can I get volume of an instrument from a live band audio GIVEN that I recorded the live mic input?

Can you isolate the intended instrument or voice for each mic input? NO. There is no practical way of doing this. This is the "holy grail" of audio processing that people have been pursuing for ...
1 vote
Accepted

Is there a way to synthesize somebody saying "Aah" like in melbourne bounce?

EDIT: Find a vocal sample that has a defined note and is low enough to be pitched upwards. Take a 250ms chop from this vocal, preferably one in which there is a slight amount of pitch movement (...
1 vote

Can you help deconstruct this SFX?

I would use a bubble pop noise like when you stick your finger in your mouth and pop it out... Then use a crinkled paper noise. They also have crow noises with each bubble pop. The crow noises have ...
  • 296
1 vote

Can you help deconstruct this SFX?

Hmmm...tricky. I'd say something like a wet pair of jeans smashed against the floor together with squeezing a balloon, all with a lot of compressor.
1 vote

Can you help deconstruct this SFX?

It sounds like a combination of a short hit sound and a long water splash sound. Maybe a little paper wrinkling noise can be added.

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