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metronome, which can click back and forth at speeds surpassing 48,000
times a second. It is one of the most widely used forms of synchronization
in digital audio.
Super clock
– This signal comes from Layla’s
Word Clock
connector too.
Its signal runs at 256 times the sample rate. A lot of equipment, including
Layla, uses a 256x word clock internally. Using super clock allows the
equipment to synchronize more accurately and adjust more rapidly to
different sample rates.
Note
: A lot of equipment, including many “clock synchronizers”, generate
super clock using a “phase lock loop” or PLL circuit. This can produce a
super clock with a lot of “jitter,” which can cause noise on Layla’s (and
other) analog converters. Layla has a “low-jitter” clock generated using
digital synthesis techniques. It is recommended that word clock be used
when slaving Layla to other external equipment, reserving super clock for
synchronizing multiple Laylas together.
S/PDIF
– The Sony/Phillips Digital Interchange Format is a serial bit-
stream that has a clock signal embedded in the data stream. When recording
from a S/PDIF source, Layla will utilize the synchronization clock that is
embedded in the S/PDIF while it decodes the bitstream.
Note:
When recording from an S/PDIF port, you must select S/PDIF as the
input clock. For greater flexibility, this is not done automatically. If you
find that your S/PDIF recordings contain pops or skips, be sure that you
have selected S/PDIF as your input clock.
MIDI Time Code (MTC)
– MIDI time code differs from the preceding
synchronization methods. Instead of simply providing the rate at which
things should proceed, it transfers information in an elapsed time format
(HH:MM:SS.) In addition, MTC also transmits a frame number to give the
fine definition that is needed. This longitudinal format has the benefit of
including positional information; however, over time it tends not to
maintain as tight a sync as sample based synchronization techniques.
Now let’s take a look at some possible configurations and how you might
set them up from a synchronization standpoint.
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