
Compact discs
The compact disc offers many advantages over the LP record.
Noise and distortion produced in recording and playback are
eliminated. Dynamic range and channel separation is greater,
and the disc is less vulnerable to damage because the
information is not on the surface but is sealed in. Consequently,
it does not deteriorate with repeated playings. It can store extra
data in the form of programme details, expired time, and even
two extra channels to give quadrasonic reproduction. Its 12 cm
single side plays for
1
hour, which is longer than both sides of
an LP.
Principles
The system uses digital techniques which were first patente ...