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298 SYNCHRONIZATION
Synchronization
Synchronization is of considerable importance to an audio system, since it is necessary to
align playback and recording speeds of different system components with another.
Samplitude can be configured to act as master or slave within a synchronization system.
As a master program it generates the necessary timing information required for other
system components; as slave Samplitude receives the timecode data which it follows
during playback or recording.
In a synchronization system there are also other important parameters, i.e. the
synchronization format and the unified "language" required for smooth communication.
Clock on digital systems
Sound cards with only analog in and outputs use the PC's reference clock only. As soon
as digital signal flows are processed, e.g. via ADAT, SPDIF, or MADI, it becomes important
to define a clock reference within the total system. The clock signal is transferred via
Blackburst, Worldclock, or the digital input and can be received by the playing or playback
computer. There are also external devices like converters or mixers that provide a clock
reference. In such systems, there can be only one master but several slaves. The purpose
is to set the digital audio stream to a synchronized beat basis und thereby prevent
crackling. The settings have to be made in the corresponding sound card or on your
external device.
Time-related synchronization of projects
For larger setups it may be necessary to link different audio systems and video systems.
This will enable them to orient themselves with the behavior of the master, and the
timecode information (transport and progress) is implemented correspondingly.
Synchronization in general
Synchronization Methods
In the synchronization format you will find slave device information about the start position,
start and stop signals and, in extended formats, the precise timing information, which are
continuously transmitted.
Samplitude understands and transmits the synchronization formats MIDI-Clock, MIDI
timecode (MTC) and SMPTE.
MIDI clock
MIDI clock only contains the SPP (song position pointer) and the start/stop signals. There is
no continuous timing information embedded in the MIDI clock signal, nor is this
transmitted. This type of synchronization is principally therefore only suitable for starting
and stopping. The greatest drawback of this type of synchronization is the fact that
Samplitude can verify though whether the audio tracks are played back in full sync, but
MIDI clock does not provide further continuous time information to allow the internal
position to be compared with the external signal.