Clearing the clean #1: on the street

In the front of the 4AM Forum for Architecture and Media (Brno, Starobrněnská 16/18) I placed an audio system which responses the by-passers movement over some man-hole covers.

1. phase: installation of the computer vision system and testing it locally.

 

The dv camera installed in the window. Analysed points: top-left, bottom-right  

2. phase: install the loudspeaker as mini fm radio in the man-hole:

 

 

and it seems working:

Some people are searching the source of the sound.