Sony DVP S9000ES User Manual

Page 14

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14

The DSD analog-to-digital converter produces a one-bit pulse

train that appears remarkably analog. In this manner, DSD encoding

combines the

advantages of digital

recording with the

well-regarded

characteristics of

analog sound. For

recording artists,

producers and

engineers, DSD

technology is a

priceless new tool. For audiophiles, it’s a major step closer to

pure music.

Not surprisingly the DVP-S9000ES audio section makes

extensive use of technologies originally developed for the world’s

first SACD player, the Sony SCD-1. Here are the highlights.

1. RF Processor. For all types of disc, including DVD, this

circuit performs clock signal extraction, synchronization,

demodulation and error correction.

2. DSD Decoder. For SACD only. Authenticates the SACD

invisible watermark, separates text from music and forms the

left and right DSD pulse trains.

3. ACP System. For SACD only. Controls the influence of

switching distortion.

4. VC24 Plus Digital Filter. For CD only. A supremely

advanced version of the familiar 8x oversampling digital filter.

5. Current Pulse D/A Converter. For SACD and CD.

Supremely accurate conversion from 1-bit digital to analog.

6. Low Pass Filter. The SACD analog low pass filter helps

deliver frequency response to 100,000 Hz, unprecedented in a

home audio source component.

A Foundation for the Future

For nearly 30 years, digital audio has been based upon Pulse

Code Modulation (PCM) technology — and nobody knows PCM

better than Sony. We’ve used it to develop everything from

Compact Disc and DAT to professional DASH recorders and

digital mixing consoles. But to achieve a truly fundamental

breakthrough in music reproduction, Sony has invented a truly

amazing audio technology: Direct Stream Digital (DSD)

encoding. DSD encoding is destined to serve as the foundation

for digital audio in the future.

Even the most advanced PCM record/playback systems require

decimation and interpolation filters that can cause problems,

including requantization noise, passband ripple and ringing.

These degradations can smear musical overtones, muddy the

soundstage and compromise overall transparency. A radically

simpler approach, Direct Stream Digital processing eliminates

these problems by eliminating the filters! It enables a 1-bit

signal to be recorded directly.

Direct Stream Digital processing is dramatically different, even

when compared to the most sophisticated PCM technology. This

1-bit system encodes music at an astonishing 2,822,400 samples

per second. The result is more than just superb frequency

response and dynamic range. You’ll hear the inner detail of

choral ensembles. The reverberation trailing from a guitar chord.

And the acoustic space surrounding the instruments. With DSD

technology, you hear every nuance of sound reproduced with

incredible ease and clarity.

Simplifying the Signal Path

Beyond Comparison

The Digital Equivalent of Straight Wire with Gain

Fig. 15: In high-end audio, simplest is best. And compared to conventional PCM, the new DSD system is far simpler.

Overview of DSD Circuitry

Direct Stream Digital

TM

Encoding:

Fig.16: The Direct Stream Digital pulse train

“looks” remarkably like the analog waveform it

represents. More pulses point up as the wave goes

positive and down as the wave goes negative.

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