Project: Comparative Acoustic Noise Measurment

Cow Bells and Generator ( :32) This is an acoustic noise measurement and result - Acoustic Movie of a house-based generator and the cow bells in an adjacent field. A 48 Channel Microphone array was used and recorded with 96kHz sampling rate. The measurements were taken and visualized by a team of the GFAI Tech GmbH from Berlin. Source: YouTube

See also: 

Acoustic camera (:35) - Finding annoying buzz in a complex acoustic environment of overhead power lines. Visualized with colour contours and hear with virtual microphone. Scan by frequency to identify the tone. Using a Norsonic Acoustic Camera 

Source: YouTube.