CD-I CD-I: Compact-Disc Interactive, outdated system originally developed and favored by Philips, which basically had the same idea behind the current one DVD (see DVD) is plugged in. However, this format has not established itself on the market. Similar entries A / V AB comparison mapping width fall time APR shielding absorber absorption absorption coefficient dispersion characteristics Beam angle sample rate/sampling frequency AC AC-3 signals AC coupling