Sony S9000ES manual Custom Memory / Playback Memory, Video Clock and Video Data TBC

Optimized Video Filters

Separate video filters for progressive and interlaced outputs help achieve wide bandwidth, high resolution and minimum out-of- band noise.

High-Speed Video Buffers

The interlaced output must pass 6.75 MHz, while the progressive output must achieve twice that frequency — 13.5 MHz. Since bandwidth equates to resolution, the DVP-S9000ES is equipped with high-speed video buffer amplifiers that are more than equal to the task. These circuits can pass 325 MHz without loss. As such, the buffer amps are prepared to drive capacitive cable runs, while minimizing such distortions.

Output Capacitor-Less (OCL) Coupling

In typical audio and video design, an output capacitor prevents the accidental passing of DC offset voltage from one component to the next. However, the mere presence of the output capacitor can affect the audio frequency response and literally tinge the television picture with unwanted shading. And these effects are beyond the adjustment of your television’s video adjustments. Sony’s answer is a rigorous design that controls DC offset voltages from the start. You get reliable operation without performance-robbing output capacitors.

the noise of alias signals (bumps on bottom).

Fig. 13: The Super Sub Sampling Alias Filter (top) controls

In addition, the converter employs video oversampling similar to the oversampling near universal in audio CD players. To capture 13.5 MHz signals, the luminance channel uses a 27 MHz sampling frequency. The D/A conversion uses 2x oversampling system to bring this to 54 MHz. In a similar process, each chrominance channel gets 4x oversampling. The CB and CR sampling frequency of 13.5 MHz is quadrupled to 54 MHz. As in CD players, this method makes quantization noise easier to filter out, with more linear amplitude frequency response within the passband and superb suppression of noise outside the passband. As incorporated in the Analog Devices Super Sub

Alias FilterTM design, this achieves better

signal-to-noise ratio and superb frequency

response, taking DVD 4:2:2 D/A converters into the realm of 8:8:8 performance.

more accurate rendition of colors and gray scale from the deepest black to the brightest highlights.

Video

DVD Technical Notes

Custom Memory / Playback Memory

Many of the video equalizer adjustments exist to tailor perform- ance for individual DVDs. That’s why the DVP-S9000ES can store your favorite settings for instant recall. Custom Memory lets you store five standard settings for different movie studios, different DVD genres or different types of display. Playback Memory stores your fine-tuned adjustments for up to 300 discs. Each time you insert one of the 300 discs, the player will automatically recall your specific hand-tailored adjustments.

Video Clock and Video Data TBC

The master clock resides in the Audio section. But instead of passively receiving the external clock signal, the video circuit regenerates its own 27 MHz reference clock with its own quartz crystal. This reference is distributed to every digital video circuit. So timing errors and their consequent distortions are kept to a bare minimum. Images achieve maximum stability and minimum jitter.

Fig.12: A dedicated 27 MHz quartz crystal oscillator regenerates a

super-clean video-only reference clock.

54 MHz Video D/A Converter

One natural consequence of supplying both progressive and interlaced video outputs is the need to provide both progressive and interlaced video D/A converters. DVP-S9000ES is equipped with both video D/A coverters, one for interlace output and the other for progressive output. The DVP-S9000ES progressive D/A converter was developed in cooperation with Analog Devices Corp., the same company that built the 32-bit SHARC processor in Sony’s TA-E9000ES A/V digital preamplifier.

This is a Large Scale Integrated circuit (LSI) of remarkable processing power. Sony’s previous designs converted the DVD’s 8-bit video samples with 10 bits of precision. This current LSI raises the standard of performance with 12-bit conversion for the luminance (Y) signal and 11-bit conversion for each of the color difference signals (CB and CR). Higher word lengths enable four times the fine gradations in the luminance channel, and twice as many gradations in each of the color channels. So you get a

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