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RE: Best processors -but best tech ?

But also look at the distortion specs. for PCM1704, especially at lower signal levels, such -60dB. The distortion is greater than it is for a modern sigma-delta converter.

As far as the engineers, don't be too hard on them. They get driven by market pressure too. Those that pay the bills get to call the shots - customers. The market wanted lower cost converters still having good distortion specs. Noise-shaped sigma-delta modulation (SDM) converters typically exhibit much lower audio band distortion than do full resolution multibit converters.

Full resolution multibit can also made to have low distortion, but typically requires time consuming costly trimming, possible by hand, depending on the design target. In addition, the greater the number of bits, the more difficult is achieving a commensurate reduction in distortion. Therefore, 24-bit sample size further accelerated the issue. SDM enabled low audio distortion conversion at a low chip cost despite it's other evident drawbacks. I believe that was the primary reason for the market takeover by SDM converters. Today, the market is dominated by hybrid multibit sigma-delta converters.
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Ken Newton


Edits: 02/21/17 02/21/17 02/21/17
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