Abstract:

Audio information stored in the undulations of grooves in a medium such as a phonograph record may be reconstructed, with no or minimal contact, by measuring the groove shape using precision metrology methods and digital image processing. These methods follow naturally out of approaches used in HEP for trackfinding, pattern recognition, and in the testing of precision silicon detectors. The effects of damage, wear, and contamination may be compensated, in many cases, through image processing and analysis methods. The speed and data handling capacity of available computing hardware make this approach practical. Various aspects of this approach are discussed. A feasibility test is reported which used a general purpose optical metrology system to study a 50-year-old 78 r.p.m. phonograph record. A more extensive implementation of this approach, with dedicated hardware and software, is considered.