– The CD player as a measurement system
J.C.G Lesurf · 2018
The CD player as a measurement system The CD player has to recover information from a spiral track of small pits which have been formed at a nominal Information Layt!T inside a compact disc. Unlike the old-fashioned vinyl (or shellac!) analog recordings, the CD does not have a &s;continuous&s; groove and the optical sensor should never touch the disc. Hence the CD player must locate the required information without any mechanical guidance about where the data is to be found. Figure 10.1 illustrates the form of a typical CD surface and the optical beam used to read data from the disc.