HDMI
The SP32 launch model incorporates a three input HDMI repeater based around the Silicon Image SIL9135,
which incorporates digital audio extraction over SPDIF or I2S format. It supports both multi-channel PCM audio
from Blu-ray,SACD or DVD-players and the more commonly used Dolby D and DTS formats, which are fed over
high quality FFC cable to the DSP processor. A user selectable bypass function for HDMI audio is also available,
telling the SP32 either to process or forward HDMI audio to a display device. A user-configured default function
addresses any other audio input source, if there is no signal on the defined HDMi input.
DSP
The SP32’s DSP is performed by a Freescale DSPC56371 24bit processor, which is able to fast lock and decode
all the commonly used multichannel formats (with up to 192kHz sampling frequency). A slave Freescale
DSPB56367 24bit processor handles all delay functions, including the global 140mS delay used for perfect
synchronising of picture and sound. Analogue signals for Dolby Pro Logic IIX or DTS NEO processing are first
converted to digital by a Burr Brown PCM4202, which incorporates an automatic level sensing circuit eliminating
the need for manual ADC adjustments, as used in the SP31.
DACs and analogue circuits
The audio DACs are 24bit, 192kps WM8740s from Wolfson, used in conjunction with Burr Brown OPA2134 and
Texas Instruments NE5532 operational amplifiers for the analogue, semi-balanced, DC-servo controlled, buffering
and filtration circuits. These feed the purified audio signal into an eight-channel low distortion, half passive volume
control CS3318 from Cirrus. Lesson learned from the SP31: for the SP32 we have located all the gain stages and
DC-servo circuits before the volume control in order to achieve a much better signal to noise ratio. An eight and 2-
channel analogue bypass mode bypasses the DSP completely, are still available, for the analogue fans.
Power Supplies
In order to achieve the best possible signal-to-noise ratio for both audio and video circuits, the power supplies in
the SP32 are designed entirely in the linear domain. To save power, the SP32 uses two separate power supply
circuits: a small perfectly-tuned supply is used in standby mode to drive the standby functions while in operation
we use a large 300VA toroid transformer, which incorporates separate windings for all the different sections of the
SP32, such as video, digital and analogue. For the video and digital sections we use dedicated, custom-designed
linear regulation technologies. For the delicate analogue section we use rectification and regulation in two steps:
voltages are first regulated down to a moderate level and then down to perfection by a fast-acting half discrete
circuit. For the low voltage/high current supplies used by the DSP engine, HDMI circuits and other digital parts, we
use local regulation techniques in order to achieve fastest possible regulation while keeping disturbance levels at
an absolute minimum.
SP32 Features
•Modular Architecture.
•Fully Balanced Analogue AV Preamplifier & Digital Controller
•Dolby® True HD, DTS Master Audio, Dolby® Digital, Prologic IIX, EX 7.1, dts®, dts-ES 6.1, Neo6
•1080p HDMI Switching (3in/1out)
•Component / Composite / S-Video
•DVD-A & SACD 5.1 Input,
•Multi Channel PCM Compatible
•Fully Configurable & Format independent Bass Management
•Two Balanced Source Inputs,
•7.1 Balanced Outputs
•Discrete IR & Full RS232 Operation,
•Programmable Triggers
•Upgradeable Architecture.
•Available in Black or Titanium
•Dimensions W x D x H mm: 430 x 385 x 180
•Weight: 12 kg
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