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ARSCLIB  November 2018

ARSCLIB November 2018

Subject:

Re: Digitization of CD's - de-emphasis

From:

Jos Van Dyck <[log in to unmask]>

Reply-To:

ARSC Library and Archives Discussion List <[log in to unmask]>

Date:

Sat, 3 Nov 2018 13:37:40 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (14 lines)

Early CDs were recorded with pre-emphasis (50/15 ┬Ás) to reduce high frequency noise. This is part of the Red Book standard IEC 60908.
https://en.wikipedia.org/wiki/Compact_Disc_Digital_Audio
Audio CD players automatically apply a de-emphasis filter when the corresponding flag in the subcode data is present.
https://en.wikipedia.org/wiki/Compact_Disc_subcode

Some ripping software (e.g. iTunes) can cope with it and apply the necessary de-emphasis, however most of them (such as dBpoweramp) will not do it so the corresponding wav file needs manual post-processing to apply de-emphasis.
https://wiki.hydrogenaud.io/index.php?title=Pre-emphasis

WaveEmph by Th. Ahlersmeyer is a dedicated program to apply de-emphasis:
http://www.picosound.de/E_SOFT#emphasis

Kind regards,
Jos Van Dyck

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