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Early CDs were sometimes encoded with Pre-Emphasis. The attached Paragraphic Equalizer Preset can be used to reverse that curve (De-Emphasis). I measured the accuracy of this preset curve against the math associated with the pole-zero pair definition EIAJ CD/DAT de-emphasis standard. I used random noise from the Make Waves Generator and the Diamond Cut Spectrum Analyzer. Here are the results:
Maximum Deviation from the theoretical curve from 510 Hz to 11,157 Hz is 1.5 dB.
Maximum Deviation from the theoretical curve from 11,157 to 15,000 Hz is 3.0 dB
Considering that the minumum sound level increment that the human ear can detect on complex (non-pure tone) signals is 3 dB, I think that this is within reasonable expectations.
Craig
Maximum Deviation from the theoretical curve from 510 Hz to 11,157 Hz is 1.5 dB.
Maximum Deviation from the theoretical curve from 11,157 to 15,000 Hz is 3.0 dB
Considering that the minumum sound level increment that the human ear can detect on complex (non-pure tone) signals is 3 dB, I think that this is within reasonable expectations.
Craig