Felston DD540 Owner's Manual - page 5
Introduction
Lip sync error, i.e. where sound and picture are slightly out of
synchronization, is a common problem particularly with modern
displays. There are a number of causes. For instance, the video
processing performed by sophisticated plasma screens, LCD
displays and digital projectors. This gives superb picture quality,
however the processing can take a few frames of video to
complete, meaning the picture is displayed a fraction of a
second after the sound.
On top of this, television broadcasts can also suffer from lip sync
error before they even reach your display. Again typically the
video lags behind the audio by a small amount. There are other
sources of the problem too. In the worst cases two or more of
the causes combine to produce a very obvious and frustrating
synchronization error.
The Felston DD540 digital audio delay provides a solution to this
for any user with an AV amplifier and sources that include a
digital audio output (DVD players, certain digi-boxes etc.) Up to
two sources can be connected simultaneously. By providing a
means of delaying the audio signal before it reaches your AV
amplifier, the DD540 puts sound and picture back in perfect
sync once more.
The amount of lip sync error present depends partly on the
components in your AV system. In addition, in the case of
broadcast television, the error can vary between programs or
even across scenes. So it is vital that the amount of delay
applied to the audio signal is quick and easy to adjust. The
DD540 provides this via its intuitive user interface that is fully
accessible from its remote control. Ease of use is further
enhanced by features such as automatic input selection,
separate delays held for each input, and a set of presets to store
the most common delays you require. In all, the DD540 means
that lip sync error need no longer disrupt your viewing
experience.
5