SpectroTyper Tone Generator


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.

The Aphex Twin Spectrogram Face

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).


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.

File Generator

Spectrotyper Generator
Accepts non-accented characters only [ASCII codes 32-126]
Your text :

Generating and downloading uncompressed files has a cost to me. Help me keeping this feature alive by supporting my work. Thank you!

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.

Help Me Help You!

Is AudioCheck free? Not for me. Your support keeps this site running and growing without ads. Every donation gets rewarded with an access to • uncompressed .wav files downloads, for every test • sample rates up to 192 kHz, in the tone generator section • a suggestion box, on every page • no ads, never.

PayPal - The safer, easier way to pay online!
EU ← living in the EU?

If you already are a patron, please log in.

Ads will disappear with 3 visitors contributing today. Still missing 2...

My Recommendation

If you are looking for pretty nice headphones, here is my favorite in terms of 'best value for the money' : the HD668b. If money is not an issue, try the HD600.

My Other Websites

HearingTest​.online myNoise.net
Check out your hearing online, with this serious test!Audiophile-quality noises and soundtracks for every day use!