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RE: Contradiction! CD player has lower TDH than its chip

Don't be too surprised. I can think of at least two reasons why that lower figure might be accurate.

1) The DAC chip's datasheet distortion spec. is likely a maximum limit for a given chip to be considered acceptable. It's a conservative figure intended to help ensure a high yield of acceptable chips, and is not the center of distribution. Otherwise, there could be frequent product returns for devices not meeting the data sheet spec. As a consequence, actual distortion produced by the vast majority, of not all, of chips would be less than that specified in the data sheet. Possibly, significantly less.

2) Should the DAC chip and the CD player circuitry each exhibit even order distortion having complementary symmetry, that distortion will tend to cancel, potentially resulting in an net lower distortion total together than each do separately.

So, those distortion figures aren't necessarily contradictory.
_
Ken Newton



Edits: 02/27/17 02/27/17 02/27/17 02/27/17 02/27/17

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  • RE: Contradiction! CD player has lower TDH than its chip - knewton 16:51:53 02/27/17 (0)

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