Acoustic fingerprinting on the ESP32 and in the Browser

Joren was asked to develop audio recognition technology for an e-costume. The idea was that lights in the costume would follow a sequence synchronised to a certain song. Only a single song should trigger the lights, all other music should be ignored.

Recognition of music and synchronisation is typically done using audio fingerprinting techniques. The challenge was that the recognition needed to run on a cheap, battery-powered microcontroller with limited CPU and memory. I delivered a prototype but eventually a cheap, battle-tested, off-the-shelf, IP-cleared, alternative was found.

(The) ‘Elsa-dress’ reacts to ‘Let It Go’ from the Frozen soundtrack. With the prototype as a starting point, I ordered an RGBLED-strip, a beefy Li-Ion Battery, an I2S digital microphone and, of course, an Elsa-dress.

See the post for additional details.


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