Can you hear digital data? © Siemens Stiftung 2018 CC BY-SA 4.0 international

Can you hear digital data?


Is digital data audible?

English, German
Audio (1.0 MByte)
A digital phone call (DSL, ISDN) is transmitted as an audio frequency. If you listen in to the transmission signal, though, all that you can hear is an incomprehensible twittering noise. This is because the signal is digitized and coded in binary form. At the beginning you will hear the dialing tone, a sequence of different pitches containing the call number in coded form. The subsequent twittering noise is then the digital call signal.

Information and ideas:
Students can carry out their own experiments with a classic analog modem with a monitor speaker which is a very good way to study the transmission of digital data in the audio frequency range. If you carry out the connection test with T-Online, for example, you can see what is happening and being transmitted at that moment in a text log displayed on the screen parallel to the audible sound.
There are no other media directly related to this file.
Sample audio clip
Information and Communication Technology (ICT); Physics; Technology
Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Middle/high school; Vocational training
Coding; Communication; Computer technology; Data processing; Digital technology; Signal (electricity); Speech; Coding; Communication (technical); Data processing (electronic); Data technology; Digitization; Signal transmission; Signaling technology; Speech
Siemens Stiftung Media Portal
MediaHouse GmbH
© Siemens Stiftung 2018
Stay up-to-date!

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

Media Portal newsletter – register now

About four times a year, we inform you about new media on this portal as well as current studies and events related to OER and STEM.

*Required fields


Liebe Nutzerin, lieber Nutzer,
El Portal de Medios – das spanische Medienportal – ist umgezogen und heißt nun CREA.
Auf CREA finden Sie weiterhin hochwertige Medien für den MINT-Unterricht und vieles mehr.

Dear User,
El Portal de Medios - the Spanish Media Portal - has moved and is now called CREA.
On CREA, you will continue to find high-quality media for STEM education and much more.

Estimado usuario, estimada usuaria,
El Portal de Medios – en español – ha sido trasladado y ahora se llama CREA.
En CREA seguirá encontrando medios de alta calidad para la enseñanza de STEM, y mucho más.

Zu CREA wechseln / Switch to CREA / Cambiar a CREA
CREA - El Portal de Medios para la Enseñanza STEM

Hierbleiben / Stay here / Quédate aquí:
Fenster schließen / Close window / Cerrar ventana