Denon AVC-A1SR User Manual download pdf (Page 7)

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Thorough Vibration-resistant Design

Since the high-density data recorded on DVD must be read with absolute

accuracy, vibrations from outside or from internal sources, such as the

power supply, will adversely affect sound and picture quality. A variety of

designs have been incorporated in the DVD-A1 to suppress these unwanted

vibrations. The bottom plate forming the foundation of the chassis is a 6-mm

thick, 4-layer hybrid construction made up of a 1.2-mm thick copper-plated

metal sheet and three layers of 1.6-mm metal sheets. Large insulators of

sintered alloy (the same type used in Denon's high-end S1 series) have

been used for the DVD-A1's feet to absorb external vibrations. Reinforcing

plates for the base, front, and rear are composed of four 1.2-mm thick copper-

plated sheets, that have been utilized in a 3-box construction design to

strengthen the chassis. The chassis also uses copper plating to bring the

ground electric potential of the overall chassis close to equipotential in order

to suppress electrical noise. The top cover uses three types of 1.2-mm thick

metal sheets in different shapes, while 2.5-mm thick aluminum panels have

been used for the sides, giving rigidity to the entire chassis. The DVD

mechanism is mounted on a cast-aluminum base between the mechanism

and the chassis. Parts made of different materials effectively absorb vibra-

tions caused by the unit itself as well as from outside to ensure stable opera-

tion.

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THX Ultra Certified

The THX Ultra certification standards are comprised of tests in three cat-

egories; Audio Quality, Video Quality and User Interface. These tests

ensure that a certified DVD player is fully capable of bringing out the best

visual and sonic quality of all your DVD discs.

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Newly-Developed Loading Mechanism

for Suppression of Vibrations

The newly-developed loading mechanism uses a guide and tray

painted with protein material that is highly resistant to vibrations in

order to prevent unwanted vibrations to the tray.

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New PureProgressive

Circuit

(NTSC Conversion Output Only)

The DVD-A1's interlace to progressive converter is the new SiI504

Converter with PureProgressive

circuitry from Silicon Image. The SiI504

features faster moving picture detection and improved film/video mode

recognition capability.

High-speed processing: This Sil504 Progressive Converter is capable of

processing 6 billion operations per second, providing the finest in motion-

adaptive de-interlacing.

Moving picture detection: PureProgressive

features 2:3 pulldown

detection, which converts 24-fps Film based material to 60-fps TV/Video

playback, while also detecting Video based material, animation and

graphics. PureProgressive

is capable of reproducing DVD-Video discs

containing both Film and Video material, as well as high picture quality

progressive video sources, while avoiding the flickering caused by

detection delays of these different formats. In processing moving video

signals, a conventional progressive converter performs detection on a full

frame-by-frame basis, while PureProgressive

stores 4 fields of video

signals in a 64-Mbit SDRAM buffer, enabling the detection and processing

on a pixel-by-pixel basis to achieve greater precision in discriminating

between moving and still pictures.

Improved 2:3 pulldown detection: There are cases in which 2:3 pulldown

data signals on DVD-Video discs are not in sync. The PureProgressive

converter will quickly detect the non-sequential points and perform

appropriate corrective measures at high speed to minimize picture flickering.

It is now also possible to select Level Detection or Flag Detection as the

detection method used for Film and Video material. If an incorrect flag was

recorded or the difference between the video level and noise level is very

small and distinctions on the disc are difficult to detect, this selection ensures

optimum detection capability and minimizes picture quality degradation.

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14-bit, 108-MHz Video D/A Converter

The DVD-A1 uses a total of six 14-bit, 108-MHz video D/A converters to

tap the maximum potential of the new PureProgressiveTM circuit's

performance. The DVD-A1 uses independent D/A converters for

Progressive and Interlaced picture reproduction.

These converters provide a very high sampling frequency of 108-MHz,

with 4x oversampling used for Progressive and 8x oversampling for

Interlaced operation, resulting in the highest detailed D/A conversion.

Since a filter with ample cutoff characteristics can also be used for the

analog low-pass filter, the DVD-A1 reproduces the delicate nuances of

video signals, allowing viewers to enjoy the original picture at the highest

level of realism.

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Noise Shaped Video (NSV)

The NSV feature works in the digital domain to reduce noise in the video

signal frequency band in order to enhance video signal linearity.

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Super Sub Alias Filter

The S/N ratio can be improved when unwanted signals of higher than

6.75 MHz following D/A conversion are cut. The DVD-A1 thus uses a

Super Sub Alias Filter that produces flat characteristics, ensuring that

adverse influences do not affect video signals inside the essential fre-

quency band, and folding noise is eliminated. In the DVD-A1, the

Super Sub Alias Filter is applied to the chroma signal as well as the

luminance signal, improving color reproduction.

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A Wealth of Picture Quality

Adjustment Functions

Contrast, Brightness, Hue, Sharpness, and Gamma can be adjusted

as desired by the user.

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AL24 Processing Plus

Denon has further developed its proprietary AL24 Processing, an analog

waveform reproduction technology, to support the 192-kHz sampling frequen-

cy of DVD-Audio. This new technology, AL24 Processing Plus, thoroughly

suppresses quantization noise associated with D/A conversion of LPCM sig-

nals to reproduce the low-level signals with optimum clarity that will bring out

all the delicate nuances of the music.

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24-bit, 192-kHz Audio D/A Converters

The DVD-A1 uses 8 Burr-Brown PCM-1704, high-performance 24-bit,

192-kHz D/A converters to faithfully and accurately enable high-quality

performance required for any multi-channel playback. Each main chan-

nel(FL/FR) have 2 DACs per channel in a differential configuration,

while the Center/Surround Left/Surround Right/Subwoofer channels

receive one per channel.

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Pure Direct Mode

The DVD-A1 includes two Pure Direct modes that further improve sound

quality. For example, during analog audio output, Pure Direct can turn off

digital signal outputs, video signal outputs, and the front panel display

which can easily influence the sound quality of the analog audio signals.

The user can define which operations are to be turned off and store those

preferences in memory.

Frequency

Noise level without NSV

oise

l w

ith

Analog filter characteristics

Noise level with NSV + analog filter

Fig 1. Noise Shaped Video (NSV) Characteristics

Level

13.5 27 54 108 MHz

Video signal

Video noise Video noise Video noise Video noise

13.5 27 54 108 MHz

Video signal

27 MHz Sampling

54 MHz Sampling

108 MHz Sampling and Super Sub Alias Filter

Signal loss and phase characteristics degradation occur here

Noise mixes in

Analog filter

Super Sub Alias Filter

Sufficiently flat characteristics

in the required frequency range

Ample cutoff characteristics

Video noise Video noise

Video noise

Fig 2. Super Sub Alias Filter Characteristics

1 2 3 4 5 6 7 8

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Denon AVC-A1SR User Manual Page 7

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