Spectrogram
Any sound can be visually represented by its spectrogram, an image of its spectrum. The horizontal dimension corresponds to time and the vertical dimension corresponds to frequency. The intensity of a given frequency at a given time is given by a color plot at that {time;frequency} coordinate in the image space. Spectrogram views can be found in audio editing softwares such as Adobe Audition, Audacity and many others.
Viewing a spectrogram sometimes reveals curiousities, such as Aphex Twin's face synthesized as sound for the express purpose of being discovered in this manner (see the link in the column aside).
SpectroTyper
| An audio recording followed by SpectroTyper's output |
Audiocheck's unique SpectroTyper tool does the same but uses plain text instead of images. SpectroTyper converts a series of characters into cool-sounding computer-like tones, secretly readable from a spectrogram view (use the linear frequency scale best).
The spectrogram above depicts a conventional audio recording, followed by SpectroTyper's output. The text "www.AudioCheck.net" has not been superimposed but comes from the particular spectrum of the sound itself!
You can use Spectrotyper to hide easter eggs in your music productions or to tag copyrighted audio material with your own identifier or source information.
Steganography is the science of hiding information, and the practice of concealing messages or information within other non-secret text or data.
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Spectrotyper uses additive synthesis (A4 tone as baseline) and outputs a 16-bit 44.1 kHz .wav file. The text is written in the telephone frequency band (880-3520 Hz) with a 'typing' speed of 100 ms/char.
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