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Introduction
2
G68 Digital Surround Controller
The G68 is a powerful, flexible surround controller with a built-in
AM/FM tuner, and represents the centrepiece of the G Series range,
with multiple variants available to suit a wide range of applications.
At the heart of the G68 is a powerful DSP engine consisting of five
Motorola 56367s running at 150MHz – delivering an incredible
750MIPS (million instructions per second) capability. Processing
is performed at high sample rates and with 48-bit precision
throughout, ensuring that all filtering, processing, and other
operations are carried out beyond the limits of human hearing. The
G68 is thus a perfect processor for the very latest in digital audio,
such as DVD-Audio and DVD-Video.
Analogue signals are converted via a 24-bit Delta-Sigma converter
to high-sample-rate digital on input to the processor, while all
digital signals are reclocked to minimise jitter and maintain total
data integrity. All versions of the G68 include two six-channel
S/PDIF digital inputs (coax), up to five stereo TOSlink optical inputs,
and six more stereo coax digital inputs. In addition, there’s a six-
channel analogue input, and five stereo analogue inputs.
Video switching
The G68ADV, AXV, and XXV are not only audio processors; they
also provides broadcast-quality video switching and signal handling
for the highest quality picture you have ever seen. There are four
S-video inputs and two outputs; four composite inputs and two
outputs; and three component inputs with one output.
Formats supported
The G68 combines controller and surround processor functions,
meeting the latest THX specifications and including MPEG, DTS,
Dolby, Trifield, and Ambisonic decoding. In many cases the decoders
incorporate our own code, giving them superior integration with
the Meridian design philosophy, as well as superior performance.
As a result, the G68 can decode surround signals from all PCM
optical discs. The G68 is thus an ideal complement to a G Series
optical disc player like the G98.
Smart Source feature
The G68’s ’Smart Source’ feature continually monitors the digital
inputs and automatically loads the correct decoding software for
the format, speaker layout, and encoding of the incoming signal.
This capability is enhanced by MHR SmartLink, which provides a
digital link between a Meridian optical disc player and processor,
carrying explicit information about the nature of the datastream as
well as encrypted high-resolution digital signals from DVD-Audio
– the first system of its kind to be approved. Virtually all other
manufacturers oblige you to go through an analogue connection,
losing quality in the process.
You can also store separate parameters for each source (such
as DVD) depending on whether the incoming signal is stereo or
surround, so that any source material is played with the decoder of
your choice.
G Series DSP 2 31/10/03, 4:23:45 pm