Specifications
Discrete Devices for ultimate performance in each circuit block
(D.D.S.C.-HD)
The great appeal of a home theater is to be surrounded by dynamic, realistic
sound and stunningly beautiful video images. In this age of high-quality 1080p video
and high-definition audio, the core of Denon A/V surround sound technology has
been the Dynamic Discrete Surround Circuit (D.D.S.C.). Now, Denon has developed
the D.D.S.C.-HD circuit so that high-quality HD audio performance is on par with
the high quality of video images. This new circuit masterfully embodies Denon’
s foremost design concept for A/V surround amps which is to “reproduce content
with total fidelity to the original intent of the producer.” The D.D.S.C.-HD reproduces
with ideal quality the sound of the latest high-grade HD audio sources.
Discrete Devices for ultimate performance in each circuit block
Dolby TrueHD and DTS-HD Master Audio decoders
Three All 32-bit floating point DSPs
Audio DACs in dual differential mode (1 per audio channel) on all output
channels
Master clock design for more accurate processing and less jitter noise
Audio ADCs in differential mode (2 per audio channel) on all analog input
channels
DSP processing of EXT IN analog audio input is possible. Denon surround
modes can also be enjoyed with external input audio signals.
Advanced AL24 processing provides more dynamic range
In AL24 Processing, the internal processing circuit generates 8 lower bits of data
which are added to the original 16 higher bits for 24-bit quality output. The circuit then
interpolates the digital data so that it as closely as possible reproduces the smooth-
ness of an analog waveform and allows recordings on CD or other digital media to
sound the way they should in the natural world. Figure 1 shows the playback sine
wave of conventional 16-bit data and how an audio signal that is only output in steps
of one LSB is smoothed as if it were 24-bit data. Of course, these differences are also
clearly audible: distortion that causes discomfort is reduced and the sound enjoys a
superior S/N, free of noise. In addition, Advanced AL24 Processing uses proprietary
high-speed signal detection technology and high-speed processing technology to
perform high-sampling up conversion on the time axis and produce a sine wave that
is even closer to that of an analog signal. Besides expanding the conventional number
of bits, Advanced AL24 Processing uses high-speed arithmetic processing algorithms
developed by Denon to observe and analyze sample groups of the original data and
make interpolations associated with up sampling and frequency range expansion.
Figure 2 shows the features of arithmetic processing. If we observe the sine wave
of a relatively large attack signal assuming an actual music signal, we can easily see
how different it is from conventional processing. While considerable ringing occurs
with general FIR filters both before and after the attack signal, there is little ringing
with Advanced AL24 Processing and we can see how well suited this technology is
for the reproducibility of sine waves. Since greater efficiency in processing and higher
processing capacity allow data samples to be processed in one stage across a wide
range, signals can also be interpolated with greater accuracy compared to methods
such as multi-stage configurations that use conventional digital filters. In addition,
the over sampling rate has been boosted to 16fs from 8fs to facilitate the expansion
of data volume that contains a more detailed, natural sound. The sonic result for the
audiophile is the ability to enjoy musical recordings with the full ambience of the con-
cert hall replete with its spaciousness and the movements of musicians.
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ADC
ADC
ADC
ADC
DAC
XLR
RCA
Front L
Pre outputAudio Input
192kHz/24bit
DAC
DAC
XLR
RCA
Front R
DAC
XLR
RCA
Centre
DAC
XLR
RCA
Subwoofer
DAC
XLR
RCA
Surround LA
DAC
XLR
RCA
Surround RA
DAC
XLR
RCA
Surround LB
DAC
XLR
RCA
Surround RB
DAC
XLR
RCA
Surround Back L
DAC
XLR
RCA
Surround Back R
DAC
XLR
RCA
Subwoofer 2
DAC
XLR
RCA
Subwoofer 3
Zone2 L
Zone2 R
DAC
Zone3 L
Zone3 R
DAC
DSP
32bit
Floating
point
DSP
32bit
Floating
point
FPGA
DSP
32bit
Floating
point
ADC
DIT
HDMI
Rx
HDMI
Denon Link
Digital In
Analog In
Zone2 Digital Out
Zone4 Digital Out
8ch Ext. In
L
R
LVDS
SELECTOR
Advanced AL24
Multichannel Processing with PLL
Digital Interface Receiver
Figure 1
Figure 2
1 kHz,-90 dB sine waves (CD playback)
Playback sine waves with attack sounds
Compared by impulse response(24-bit,96kHz)
Conventional system AL24 Processing
Conventional system AL24 Processing
Conventional system AL24 Processing
AVP-A1HDCI AUDIO BLOCK DIAGRAM