PhonoPaper is described as 'Camera app for playing pictures with encoded sound (PhonoPaper-codes). With this app, you can also create your own codes: 10 seconds of sound can be recorded from a microphone and converted into an image' and is a Audio Editor in the audio & music category. There are three alternatives to PhonoPaper for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best PhonoPaper alternative is Virtual ANS, which is free. Other great apps like PhonoPaper are Photosounder and spectrogram.
Virtual ANS is a software simulator of the unique Russian synthesizer ANS - photoelectronic musical instrument created by Evgeny Murzin from 1938 to 1958. The ANS made it possible to draw music in the form of a spectrogram (sonogram).
Russia
Photosounder is the first audio editor/synthesizer to transform any sound as an image and to create any possible sound from an image. It have an entirely image-based approach to sound creation and editing.
France
EU
This program can display waveforms and spectrograms for audio files, as well as the reverse process, converting spectrogram images back into audio.
![A waveform and spectrogram of "[Formula]" from Aphex Twin's album Windowlicker, showing a hidden face.](https://img.alternativeto.net/s/309x197/jpeg/spectrogram_934921_full.png)
![A waveform and spectrogram of "[Formula]" from Aphex Twin's album Windowlicker, showing a hidden face.](https://img.alternativeto.net/s/618x394/avif/spectrogram_934921_full.png)