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RE: Upsampling making R2R obsolete?.....is this the revolution?

In your first post you were praising the trend of "off-loading" DSP from the DAC chip by preceding it with a FPGA or other programmable DSP. And now you're agreeing with Todd that upsampling is bogus. But these are one in the same thing. Those FPGA-based DSPs that are en vogue today are custom upsamplers.

An upsampler is just a Redbook reconstruction filter. Without it, you get whatever reconstruction filter is implemented in the DAC, which might be a generic short length 8x oversampling brick wall type. With an external DSP you can implement a more computationally intensive but possibly better reconstruction filter than what is in the DAC.

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