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Can you turn a recording upside-down?

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4

If I had a recording of some music, I could play it backwards. This is pretty simple.

If I had some music recorded, could I flip it around a note like in this image? If possible, how does that work?

sound

share|improve this question

edited 23 mins ago

Stormblessed

asked 3 hours ago

StormblessedStormblessed

1446

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If by "recording" you mean a midi file, I'm sure you could write a transformation algorithm to accomplish the task. But "how does that work" seems a little too broad.
  
  – David Bowling
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DavidBowling I mean like an MP4 or OGG file
  
  – Stormblessed
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure that those formats store audio information in a way that would allow this kind of manipulation (I don't think so). The answer will really come down to the particulars of the file formats in question, so may be off-topic here. It sounds like a question that topo morto may have some insight into; I'm sure that he will be along sooner or later....
  
  – David Bowling
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unrelated: You could, for the most part, physically turn the sheet music upside-down, except for some symbols that would be hard to read.The notes would all be mapped to new locations.
  
  – user45266
  2 hours ago
  

  
  
  
  

add a comment | 

4

If I had a recording of some music, I could play it backwards. This is pretty simple.

If I had some music recorded, could I flip it around a note like in this image? If possible, how does that work?

sound

share|improve this question

edited 23 mins ago

Stormblessed

asked 3 hours ago

StormblessedStormblessed

1446

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If by "recording" you mean a midi file, I'm sure you could write a transformation algorithm to accomplish the task. But "how does that work" seems a little too broad.
  
  – David Bowling
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @DavidBowling I mean like an MP4 or OGG file
  
  – Stormblessed
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure that those formats store audio information in a way that would allow this kind of manipulation (I don't think so). The answer will really come down to the particulars of the file formats in question, so may be off-topic here. It sounds like a question that topo morto may have some insight into; I'm sure that he will be along sooner or later....
  
  – David Bowling
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Unrelated: You could, for the most part, physically turn the sheet music upside-down, except for some symbols that would be hard to read.The notes would all be mapped to new locations.
  
  – user45266
  2 hours ago
  

  
  
  
  

add a comment | 

If I had a recording of some music, I could play it backwards. This is pretty simple.

If I had some music recorded, could I flip it around a note like in this image? If possible, how does that work?

sound

share|improve this question

edited 23 mins ago

Stormblessed

asked 3 hours ago

StormblessedStormblessed

1446

share|improve this question

edited 23 mins ago

Stormblessed

asked 3 hours ago

StormblessedStormblessed

1446

share|improve this question

edited 23 mins ago

Stormblessed

asked 3 hours ago

StormblessedStormblessed

1446

asked 3 hours ago

StormblessedStormblessed

1446

asked 3 hours ago

StormblessedStormblessed

1446

2 Answers
2

active

oldest

votes

3

No, there is no single-pass audio process that can invert notes or melodies. Something like Celemony Melodyn Studio could get you started by analyzing all the notes, and then maybe you could embark on a lengthy MIDI inversion process and then try to use the inverted MIDI to re-arrange the audio in Melodyn. That could take a long time.

share|improve this answer

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Actually, I'd say frequency shifting (not pitch shifting!) can do something that could be called melodic inversion, though it sounds really weird (as it also completely scrambles the overtones of each single note).
  
  – leftaroundabout
  25 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @leftaroundabout Is there any consumer software that does frequency shifting?
  
  – Your Uncle Bob
  19 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @YourUncleBob I'm not aware of any that does specifically frequency shifting, but the operation is mathematically related to ring modulation and indeed sounds almost as weird.
  
  – leftaroundabout
  9 mins ago
  

  
  
  
  

add a comment | 

2

Theoretically, this could be done by adapting the techniques used in a vocoder.

A vocoder works by measuring the amplitude of different frequency bands in a modulator signal (e.g. vocals), and then using that information to filter a carrier signal (e.g. a synthesizer sound), giving it a similar frequency spectrum as the modulator signal.

If you inverted the connections, you could control the low frequencies in the carrier signal with the high frequencies in the modulator signal, and vice versa. In fact, patching the connections in a non-linear way was a feature of some analog vocoders, like the Moog 16-Channel Vocoder from 1979.

^{Moog 16-Channel Vocoder (1979) with frequency band switching patch bay (image from vintagesynth.com)}

To achieve completely frequency-mirrored audio, you'd have to use white noise (which contains all frequencies) as the carrier signal, and you would need to have many more frequency bands than the dozen or so of a classic vocoder. Software vocoders like Reason's BV512 can have hundreds of bands, but you'd probably need thousands to achieve anything "realistic".

Even then, the result would not be music with mirrored note pitches. Every sound would have its component harmonics mirrored, and the result would be unrecognizable and unmusical.

share|improve this answer

edited 44 secs ago

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

add a comment | 

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3

No, there is no single-pass audio process that can invert notes or melodies. Something like Celemony Melodyn Studio could get you started by analyzing all the notes, and then maybe you could embark on a lengthy MIDI inversion process and then try to use the inverted MIDI to re-arrange the audio in Melodyn. That could take a long time.

share|improve this answer

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Actually, I'd say frequency shifting (not pitch shifting!) can do something that could be called melodic inversion, though it sounds really weird (as it also completely scrambles the overtones of each single note).
  
  – leftaroundabout
  25 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @leftaroundabout Is there any consumer software that does frequency shifting?
  
  – Your Uncle Bob
  19 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @YourUncleBob I'm not aware of any that does specifically frequency shifting, but the operation is mathematically related to ring modulation and indeed sounds almost as weird.
  
  – leftaroundabout
  9 mins ago
  

  
  
  
  

add a comment | 

3

No, there is no single-pass audio process that can invert notes or melodies. Something like Celemony Melodyn Studio could get you started by analyzing all the notes, and then maybe you could embark on a lengthy MIDI inversion process and then try to use the inverted MIDI to re-arrange the audio in Melodyn. That could take a long time.

share|improve this answer

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Actually, I'd say frequency shifting (not pitch shifting!) can do something that could be called melodic inversion, though it sounds really weird (as it also completely scrambles the overtones of each single note).
  
  – leftaroundabout
  25 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @leftaroundabout Is there any consumer software that does frequency shifting?
  
  – Your Uncle Bob
  19 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @YourUncleBob I'm not aware of any that does specifically frequency shifting, but the operation is mathematically related to ring modulation and indeed sounds almost as weird.
  
  – leftaroundabout
  9 mins ago
  

  
  
  
  

add a comment | 

No, there is no single-pass audio process that can invert notes or melodies. Something like Celemony Melodyn Studio could get you started by analyzing all the notes, and then maybe you could embark on a lengthy MIDI inversion process and then try to use the inverted MIDI to re-arrange the audio in Melodyn. That could take a long time.

share|improve this answer

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

share|improve this answer

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

answered 2 hours ago

Todd WilcoxTodd Wilcox

38.4k372130

2

Theoretically, this could be done by adapting the techniques used in a vocoder.

A vocoder works by measuring the amplitude of different frequency bands in a modulator signal (e.g. vocals), and then using that information to filter a carrier signal (e.g. a synthesizer sound), giving it a similar frequency spectrum as the modulator signal.

If you inverted the connections, you could control the low frequencies in the carrier signal with the high frequencies in the modulator signal, and vice versa. In fact, patching the connections in a non-linear way was a feature of some analog vocoders, like the Moog 16-Channel Vocoder from 1979.

^{Moog 16-Channel Vocoder (1979) with frequency band switching patch bay (image from vintagesynth.com)}

To achieve completely frequency-mirrored audio, you'd have to use white noise (which contains all frequencies) as the carrier signal, and you would need to have many more frequency bands than the dozen or so of a classic vocoder. Software vocoders like Reason's BV512 can have hundreds of bands, but you'd probably need thousands to achieve anything "realistic".

Even then, the result would not be music with mirrored note pitches. Every sound would have its component harmonics mirrored, and the result would be unrecognizable and unmusical.

share|improve this answer

edited 44 secs ago

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

add a comment | 

2

Theoretically, this could be done by adapting the techniques used in a vocoder.

A vocoder works by measuring the amplitude of different frequency bands in a modulator signal (e.g. vocals), and then using that information to filter a carrier signal (e.g. a synthesizer sound), giving it a similar frequency spectrum as the modulator signal.

If you inverted the connections, you could control the low frequencies in the carrier signal with the high frequencies in the modulator signal, and vice versa. In fact, patching the connections in a non-linear way was a feature of some analog vocoders, like the Moog 16-Channel Vocoder from 1979.

^{Moog 16-Channel Vocoder (1979) with frequency band switching patch bay (image from vintagesynth.com)}

To achieve completely frequency-mirrored audio, you'd have to use white noise (which contains all frequencies) as the carrier signal, and you would need to have many more frequency bands than the dozen or so of a classic vocoder. Software vocoders like Reason's BV512 can have hundreds of bands, but you'd probably need thousands to achieve anything "realistic".

Even then, the result would not be music with mirrored note pitches. Every sound would have its component harmonics mirrored, and the result would be unrecognizable and unmusical.

share|improve this answer

edited 44 secs ago

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

add a comment | 

Theoretically, this could be done by adapting the techniques used in a vocoder.

A vocoder works by measuring the amplitude of different frequency bands in a modulator signal (e.g. vocals), and then using that information to filter a carrier signal (e.g. a synthesizer sound), giving it a similar frequency spectrum as the modulator signal.

If you inverted the connections, you could control the low frequencies in the carrier signal with the high frequencies in the modulator signal, and vice versa. In fact, patching the connections in a non-linear way was a feature of some analog vocoders, like the Moog 16-Channel Vocoder from 1979.

^{Moog 16-Channel Vocoder (1979) with frequency band switching patch bay (image from vintagesynth.com)}

To achieve completely frequency-mirrored audio, you'd have to use white noise (which contains all frequencies) as the carrier signal, and you would need to have many more frequency bands than the dozen or so of a classic vocoder. Software vocoders like Reason's BV512 can have hundreds of bands, but you'd probably need thousands to achieve anything "realistic".

Even then, the result would not be music with mirrored note pitches. Every sound would have its component harmonics mirrored, and the result would be unrecognizable and unmusical.

share|improve this answer

edited 44 secs ago

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

share|improve this answer

edited 44 secs ago

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418

answered 34 mins ago

Your Uncle BobYour Uncle Bob

1,332418