Bedienungsanleitung Alpine pxa h 900 (Seite 4 von 72) (Englisch)

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ENGLISHDEUTSCHFRANÇAISESPAÑOLITALIANOSVENSKA

Measurement, display, and processing of sound field characteris-

tics of the passenger compartment in real time at the Highest

Precision.

Carefully selected high precision parts enable reproduction of

even the faintest signals.

■ Hand picked K-Grade “Sign-Magnitude” 24-bit DACs from Burr-Brown offer the highest

precision available.

Many types of Digital-to-Analog Converters (DACs) exist: the original multi-bit, 1-bit, bitstream,

MASH, delta-sigma, etc. But the Sign-Magnitude DAC still remains unequaled. The Sign-Magnitude

Multi-bit DAC, uses precision laser-trimmed ladder resistors to precisely decode each bit, while a

unique architecture sidesteps zero-cross distortion problems. Since even such precision manufactured

products have slight variance, each “K” grade DAC is hand picked and carefully selected for use. K-

grade products achieve a three-times lower distortion rating and higher S/N ratio compared to the

already awesome basic Sign-Magnitude. It is the highest grade DAC that can be produced at the

present time, with incredible capability to eliminate low-level noise, thus reproducing a sensitive

expression of the music performance.

■ Promising the highest precision: Burr-Brown matching 24-bit digital filter.

The PXA-H900 utilizes a very high grade 24-bit, 8 times oversampling digital filter. This companion

unit to the Burr-Brown “Sign-Magnitude” 24-bit DAC promises the highest accuracy and precision

available today. In fact, by cutting noise outside the audible range, high-precision reproduction with

ultra-wide dynamic range is possible. This creates a rich abundance of musical information and

harmonics.

■ By eliminating high-frequency noise, quietude and depth are reproduced: “GIC-type

low-pass filter”

In all CD systems, a lowpass filter keeps digital noise out of the music. Instead of a typical series

filter, Alpine has employed a GIC (Generalized Impedance Converter) filter. This type of filter

essentially short-circuits spurious noise signals while letting the music passes directly to the next

stage. Removing the series filter keeps the music purer. And, by using the special GIC filter, high-

frequency noise that cannot usually be removed by 8 times oversampling is eliminated. This high

precision low-pass filter extracts only the true musical information.

■ Rapid processing of intricate phase compensation calculation: “High speed DSP”

PXA-H900 uses four 100MIPS DSPs, each of which can process 100 Million Instructions per Second.

This totals twice the processing power of a PC with 600MHz CPU; this would qualify as a

“supercomputer” under the old U.S. Department of Defense standard. This computing speed is utilized

for high-speed processing of such effects as “Adaptive EQ”, which mandates fast real time re-

processing of complex data for time response compensation of each speaker.

■ Sound quality not possible with typical “Balance” and “Fader” circuits has been

achieved: “Independent Precision Attenuators”

Analog volume control has been said to be preferable for sound. The common analog implementation

requires three circuits in series to achieve volume, balance and fader functions. The sound passes

through each of the three stages, and each stage inevitably adds some slight distortion and noise. With

the new circuit design, each channel employs its’ own high precision ladder resistor electronic

volume. Based on the users’ settings, a microchip calculates what each channel’s output setting should

be, and orchestrates all channels together. Loss of music information due to passing through multiple

stages does not occur.

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