Remember those flat round things you may have found lying around the
house? Those that never
really worked well as flying saucers. Well, the other day I happenned to have a good
look at one through a magnifying glass. I was able to discern something waveform'esqe
in the shape of the groove. I then recalled an old legend I once heard
concerning these objects. This legend, being of technological nature,
entaled a diamond needle that would vibrate when placed atop the
revolving flat things. These vibrations, when amplified, would produce music. I thus
decided to try and extract something sensible off of this object.
When scanned, some records seemed much denser than others.
Dense tracks were much harder to follow.
Vivaldi's "The Four Seasons" was fine
When illuminated in parallel with the groove's direction
some sort of depth-modulation became visible.
This made me guess that one of the stereo channels might be encoded
in the depth/angle plane while the other was encoded in the radius/angle plane,
the later being the one I initially noticed.
The nature of my scanner and of the records reflectiveness
caused only the lower half of the record's radius/angle modulation
to be exposed on each scan.
Thus, to supply the virtual gramophone at least one complete revolution of the record,
four regions had to be separately scanned. These were later stitched together to
form an image of several complete inner tracks of the record.
Once the image was ready, writing the decoder was very simple.
All it did was rotate a "needle" around a given center at some predefined angular
velocity, attempting to keep track of the groove the needle was initially positioned
The offsets (dr) between this track and the basic radial were bunched into a sequence
these were later converted into wav files.
Here are the few nearly-intelligible decodings that I managed to recover off of
the inner tracks of Vivaldi's "The Four Seasons". Listening to the following
reference recording might allow you to recognize these as the music-within-noise they actually are!