Writing Quality - Page 1
We have all heard the familiar clicks and skips from our CD Audio Player that
result from a scratched, damaged, or dirty CD disc. Sometimes the effects of
disc defects can be subtle and result in audio distortion instead of obvious
click and skips. This distortion results from the inability of standard CD player's
error correction codes (ECC) to correct for the ablation of the underlying audio
information by a scratch defect or electrical noise.
In fact, when the CD ECC fails, many CD drives have special circuitry called
"error concealment" circuitry to conceal the errors that ECC was unable
to fix. The error concealment circuitry introduces distortion while it tries
to interpolate through the errors. Many types if error concealment circuity
will even insert audio noise when activated to mask the errors. This is hardly
what lovers of high fidelity audio reproduction seek.
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