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Arthur v3.0 Mk.3 24-bit/192 kHz D/A Converter

In its neverending mission to provide the highest technology value to all of our present and future residents, Camelot has brought the same revolutionary technology that it utilized to upgrade its Round Table DVD Player and Uther v2.0 D/A Converter, to its entry-level Arthur v3.0 D/A Converter!

Here's the scoop...

Introduction

The Mk.3 upgrade for the Arthur v3.0 D/A Converter introduces revolutionary 24-bit/192 kHz technology to the U.S. Consumer Electronics market. This upgrade utilizes state-of-the-art digital signal processing technology developed by Anagram Technologies of Switzerland. This technology enables the Arthur v3.0 to automatically upsample and decode the stereo digital audio track contained on virtually any CD, 24-bit/96 kHz DAD, or DVD-Video disc to 24-bit/192 kHz accuracy.

Description

The upgrade features custom signal processing algorithms hosted on an Analog Devices SHARC ADSP21065L- DSP. The SHARC DSP drives high performance 24/192 D/A converters and a specially designed analog stage to deliver sonic and measured performance beyond reproach. This upgrade also incorporates groundbreaking techniques such as:

RE24 24-bit Resolution Enhancement

The RE24 process allows for 24-bit resolution from a 20-bit data channel, or 20-bit resolution from a 16-bit data channel. It accomplishes this by shifting the truncation noise out of the audible band. Unlike traditional noise-shaping techniques, RE24 does not shape the noise to the higher part of the spectrum, but rather adds an algorithmically generated noise to the top part of the spectrum. This generated pseudo-random number sequence satisfies a number of statistical properties paramount to audio quality. RE24 generates this noise without reference to the incoming signal, meaning it has no correlation with it, resulting in a signal free of Intermodulation Distortion (IMD), as opposed to traditional noise-shaping techniques.

ATF (Adaptative Time Filtering)

ATF performs totally asynchronous sampling rate conversion, through totally independent input and output clocks. So while the input and output clocks may inevitably vary, ATF automatically tracks the changes with minimal distortion. ATF incorporates:

VFT (Virtual Floating Time) Digital Signal Processing

VFT replaces the discrete “digital” time model with a continuous “analog” virtual time model. This overcomes the need for a very high speed oversampling time conversion system. It also enables a digital signal to overcome some of the restrictions of Nyquist rate sampling. This technology comprises the core of the Mk.3 circuit’s Adaptative Time Filtering (ATF) Upsampling method.

ITE (Integral Time Estimation)

ITE allows for the conversion between the discrete digital time model and the continuous analog virtual time model used in VFT. To accomplish this, ITE utilizes the new approach of adding one mathematical dimension to the signal space. ITE also acts as a state-of-the-art software-based jitter attenuator.

CTF (Continuous Time Filtering)

CTF performs filtering for the continuous time domain utilized in VFT. Traditional discrete time filters do not operate with enough precision to take advantage of the continuous time representation. CTF incorporates a new concept of filtering by mixing analog and digital domains.

Application

The new Arthur v3.0 Mk.3 now accepts stereo digital audio at every defined sampling rate (32, 44.1, 48, 64, 88.2, and 96 kHz, as well as 176.4 or 192 kHz when proper transport media emerges), and up to 32 bits of resolution.

The new circuit results in new standards for Upsampling/D/A Conversion both on the test bench and in the listening room. It improves upon the already world-class audio performance of the Arthur v3.0, delivering more extended highs, clearer midrange, and tighter, deeper bass.