2.2
WHAT THE SDEC DOES
13
The SDEC, available in two models that differ only slightly in function, is a digital signal processor capable of performing
several functions simultaneously. In general, the device is fed signals from the surround processor (the Synthesis SDP-1,
2 or 2D) that have been separated into discrete left, center, and right front channels, side and/or rear surround signals,
and subwoofer/lfe (low-frequency effects) signals.
By converting these six signals into digital bitstreams, and feeding them into a DSP (digital signal processing) engine
using extremely powerful Motorola processors, the signals can be manipulated in the digital domain to achieve several
desired results.
Driver correction, arrival time manipulation, room correction, and frequency division are some of the tricks easily done by
what amounts to a powerful, special-purpose computer, but which would require inordinate complexity (and would result
in signal-quality degradation) if done in the analog domain. After processing, high-quality digital-to-analog converters
return the signals to the analog domain, and pass them on to Synthesis amplifiers.
What the SDEC does:
Driver EQ:
The drivers used in Synthesis systems are designed and manufactured to reproduce both music and the audio associated
with cinema as faithfully as possible. But real-world mechanisms, however well crafted, have limitations imposed on their
operation due to the nature of available materials and the inescapable laws of physics. Because the SDEC is used only in
Synthesis systems and, therefore, is only used with a small number of different drivers, programs can be loaded into it to
smooth out response irregularities, compensate for manufacturing tolerances, etc. Tell the system during installation
whether it’s a Synthesis I, II, or III and corrections, programmed at the factory by JBL engineers, are instantly applied to
make very good drivers sound even better.
Figure 1:
Raw Driver Response/Corrected Driver Response
Summary of Contents for SYNTHESIS SDEC-1000
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