What is ACR and how does it work?

beem uses both Bluetooth wireless technology and ACR (Audio Content Recognition) to transmit its content. These are both established technologies that are implemented safely and conscientiously by beem.

beem sends signals in various locations; for example, in trams, at poster sites, museums, on TV and in cinemas. These signals are recognised by news apps such as 20 Minuten and Bluewin, as well as the beem app, and used to play specific content on a user’s smartphone. beem uses Bluetooth and ACR to send the signals. While Bluetooth involves sending and receiving radio signals (see the Bluetooth blog post), ACR makes use of an acoustic pattern known as a fingerprint.

ACR recognises audio signals emitted during TV or cinema ads or TV programmes, for example. Previously, an acoustic pattern (or fingerprint) will have been created from the audio signal and stored in beem. If beem then identifies this fingerprint, a discreet notification will be displayed in the 20 Minuten, Bluewin or beem apps. If the user taps this notification, they can access specific, context-related information and offers.

When beem matches the audio with the sound pattern being searched for, it only does so locally (on the user’s smartphone).