Denon AVP-A1HD User Manual download pdf (Page 4)

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.

06 07

DAC

XLR

RCA

Front L

Pre outputAudio Input

192kHz/24bit

DAC

XLR

RCA

Front R

DAC

XLR

RCA

Center

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

NEW

DSP

32bit

Floating

point

FPGA

NEW

DSP

32bit

Floating

point

ADC

DIT

HDMI

Denon Link

Digital In

Zone2 Analog

Zone2 Digital Out

Zone4 Digital Out

8ch Ext. In

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

1 2 3 4 5 6 7 8 9 10 11

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Denon AVP-A1HD User Manual Page 4

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