I visited 9 sites in Pittsburgh’s East End and recorded the ambient noises that existed in these locations. I then created and analyzed spectograms of each 2 minute 30 second recording.
By cross referencing the spectogram and the recording I was able to locate and identify sounds that I would not have noticed in the recording alone. The distant siren in recording 7 was so faint that I didn’t realize it was there until I noticed a bizarrely perfect sine wave pattern in the spectrogram.
Full resolution spectograms without annotations:
A comment brought up during our review was that these diagrams appear to be foreshortened like a landscape. The linearity of the diagrams appear to define a horizon and the longer wavelengths of the deeper sounds appear larger in the lower part of the image.