DTS-HD Master Audio: lossless encoding of up to 8 channels of audio. It offers a maximum bit rate of 24.5Mbps,
up to 8 channels of 24bit/96kHz audio and up to six channels of 24bit/192kHz audio. Under the Blu-ray standard,
support is optional.
Blu-ray and LPCM
+
Currently 84% of all Blu-ray Discs offer lossless multichannel audio, split this way: 13% LPCM, 51% DTS-HD:MA,
20% TrueHD http://www.blu-raystats.com/Stats/Stats.php
SPA22 Technical information
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 SPA21, which could only switch component video and convert
S-video to composite, entirely in the analogue domain.
HDMI
Prior to HD video upgrade, the SPA22 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 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 SPA22 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 SPA22’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 SPA21.
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 SPA21: for the SPA22 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.
SPA22 features (including HD Audio upgrade)
• Modular design architecture
• 1080p/1080/24 HDMI Switching (3 in / 1 out)
• Component / Composite / S-Video
• 5 x 120 Watts
• Multi-channel PCM compatible
• Dolby True HD, DTS-HD MA, Dolby® Digital, Prologic IIX, EX 7.1, dts®, dts-ES 6.1, Neo6
• Re-Routable Front Channels in 7.1 Mode
• DVD-A & SACD 7.1 Input.
(14 pages)
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