Denon AVC-A1HD Specifications download pdf (Page 13)

Discrete Devices for ultimate performance in each circuit block

(D.D.S.C.-HD)

The great appeal of a home theatre 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 technol-

ogy 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 perform-

ance 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 out-

put 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 sur-

round 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 smoothness of an analog waveform and allows recordings on CD or other dig-

ital 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 expand-

ing the conventional number of bits, Advanced AL24 Processing uses high-speed

arithmetic processing algorithms developed by Denon to observe and analyse sam-

ple 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.

ADC

DAC

XLR

RCA

Front L

Pre outputAudio Input

192kHz/24bit

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

Denon Link

Digital In

Analog In

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

12 13

AVP-A1HDA AUDIO BLOCK DIAGRAM

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 27 28

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Denon AVC-A1HD Specifications Page 13

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