O'Reilly logo

Raspberry Pi for Secret Agents by Stefan Sjogelid

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Recording conversations for later retrieval

So we have our audio gear all configured and ready to record—let's get sneaky with it!

Picture the following scenario: you know that something fishy is about to go down and you'd like to record whatever sound that fishiness makes. Your first challenge will be to hide the Pi out of sight with as few cables running to it as possible. Unless you're working with a battery, the Pi will have to be hidden somewhere within a few meters of a power outlet.

Next, you'll want to connect your USB microphone and keep it hidden, yet uncovered if possible, to avoid a muffled recording. Unless you expect the action to take place right in front of the microphone, you should set the capture signal to the max with alsamixer ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required