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Video circuit

All analogue video inputs are converted to digital by the Texas Instruments 10bit TVP5146 video encoder, where OSD from the Sanyo LC74763 OSD generator is added. The digital signal is then converted back to analogue by the 10bit Cirrus CS4955 decoder. By performing all the video conversion in the digital domain using 10bit processing we can maintain high quality video at all outputs and at all times regardless of the selected input source. This is a significant improvement over the SP31, which could only switch component video and convert S-video to composite, entirely in the analogue domain.

HDMI

The SP32 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 multichannel PCM audio from 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 a DVI source (that does not carry audio) is connected.

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.

The SP32 surround processor is the natural successor to the successful SP31, which was recognised around the world for its high performance and innovative user interface. As the first of a new generation of Primare home entertainment products however, the SP32 represents a considerable evolutionary advance in terms of design, performance, user flexibility and versatility.

MODULAR DESIGN

The SP32’s comprehensively shielded heavy-duty steel chassis houses a newly developed modular design that allows for DSP, video and connections to be upgraded easily with proprietary Primare boards, incorporating thoroughly evaluated and optimised versions of the latest technologies and connectors. This makes the SP32 an ideal high-end surround and video processing platform for many years to come.

In every instance we have taken special care to keep signal paths short and layouts uncomplicated, which together with high performance FFC-wiring gives the unit an extremely high performance and the highest possible signal-to-noise ratio. The finest audio grade semiconductors and capacitors have been used whenever possible. All parts that are known to interfere with each other are isolated by shielding, dedicated signal paths and power supplies.

OPERATIONAL VERSATILITY

Almost every parameter in the configuration of the SP32 can be user defined. Any input can be assigned a name and associated with any audio and video source. Surround format, trigger activation and input sensitivity can be specified for the input. Individual levels, speaker types, crossover frequencies and delay configurations including bass management can be selected for each of the major surround formats. A 140mS global delay system, with dedicated DSP, is incorporated in order to achieve the best possible picture to sound synchronisation. For the highest possible installation flexibility, all the SP32’s functions can be controlled in three ways: from the front panel, IR or RS232.