【雲中來的音樂 - Computer Audio】家訪 Eton

[Eton]

8/14 台北圓山國際音響展第一天晚上，因 dCS 代理傑富國際的安排，有機會與 dCS 主事者 Mr. David Steven Jr. 餐敍，我問到了為 dCS 數位類比轉換的核心是
5-bit 環型架構可解 PCM 又可解
DSD 有何特別的設計理念？他回英國後回了一封 eMail，原文與大家分享！

The Ring DAC(tm) Board - How Does It Work?

After oversampling and digital filtering, the audio is re-encoded as 5 bits
of noise-shaped data and passed to the Ring DAC(tm) Board. Here the 5-bit
binary data is mapped onto the array of 48 latches and precision resistors
which are at the heart of the Ring DAC(tm) topology.



The mapping algorithm is carefully designed to avoid any mismatches between
the latches or resistors appearing as errors correlated with the signal,
ensuring excellent linearity, even at low signal level.

The latch outputs drive balanced currents through their associated precision
resistors which are combined by a balanced mix amplifier / filter stage. The
filter removes any unwanted images and switching artefacts, leaving
balanced, high-quality analogue signals.


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