December 26, 2019

The Internet Archive: Digitizing & Preserving Over 100,000 Vinyl Records

Open Culture takes a llok at the initiative of The Internet Archive to preserve over 100,000 vinyl recordings:

Once cataloged, the LP’s are then digitized. The Internet Archive partners with Innodata Knowledge Services, an organization focused on machine learning and digital data transformation, to complete the digitization process at their facilities in Cebu, Philippines. An Innodata worker digitizes 12 LPs at a time, setting turntables to play and record by hand, then turning each record over to the next side. Since each LP is digitized in real time, it takes a full 20 minutes to record an average LP side. By operating 12 turntables simultaneously, the team expects to be able to digitize ten LPs per hour.

Once recorded, there is a large FLAC file for each side of the LP, which needs to be segmented so listeners can easily begin at the desired song. There are two different algorithms used for segmenting; the first one looks at images of the vinyl disc to locate gaps in its grooves, which usually line up with gaps between songs. A second algorithm listens to the audio file to find the silent spaces between songs. When these two algorithms align, our engineers have a good measure of confidence that the machine has found the proper tracks.

No comments:

Post a comment