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It does not eliminate interference from co-channel users (other users on the same radio channel). If two users try to talk at the same time, the signal will be affected by the other party using the channel. Some selective calling systems experience falsing. In other words, the decoder activates when a valid signal is not present.
With CAV LaserDiscs, the user could jump directly to any individual frame of a video simply by entering the frame number on the remote keypad, a feature not common among DVD players. Some DVD players have a cache feature, which stores a certain amount of the video in RAM, which allows the player to index a DVD as quickly as an LD, even down to ...