εxodus has found at least 5 games embedding Alphonso tracker:

"Alphonso listens to audio signals in TV advertisements and is included in games and other apps for children."

NYTimes article:

@exodus @U039b

I'm fairly sure this tactic may contravene domestic laws in at several EU countries (especially targeting kids and embedding the sound in TV ads)

With DVB-T(2) its unclear what actual audio bandwidth of linear TV is but likely to be 20 KHz max. Putting near inaudible high frequencies into the adverts is potentially also a source of annoyance/distress to the children (esp babies) and pets (such noise was used to scare away teenagers from outside buildings in the UK!)

We do not know if it is legal or not in EU. As far as we know, trackers based on audio signals as trigger use 18kHz-20kHz frequency range. And sure, it could be annoying to children and pets! But, you know, tracker editors do not care about that 😡.


TBH each EU country has its own domestic laws that take precedence, but I think this is something that Communications Ministries/media regulators (i.e Ofcom UK and equivalents elsewhere should be made aware of, as in many countries it is already illegal to target children for advertising certain products such as junkfood and the marketers tend to do stuff like this to try and get around these regulations.


In France, we have the CSA but we do not know if alphonso or similar trackers are used in EU or in France.

@exodus @U039b I no longer watch linear TV (for kids or adults) and don't play computer games, but this should be fairly easy to test by converting the audio output of a TV broadcast to a digital recording and using the spectrogram display modes (I think even Audacity has them) to investigate any unusual content in the higher frequency bands.

I think there is a French law about "peak loudness" on TV audio as well; which may also impact on the legality of using these techniques!

@vfrmedia @U039b
Humm, it could interesting to do the experiment you proposed 🤔

Inscrivez-vous pour prendre part à la conversation

Framapiaf est un service de microblog similaire à Twitter. Il est libre, décentralisé et fédéré. Il permet de courts messages (max. 500 caractères), de définir leur degré de confidentialité et de suivre les membres du réseau sans publicité ni pistage.