Pre-emphasis - Revision history

LazLong: /* Software designed to apply de-emphasis */

2021-10-09T05:13:34Z

Software designed to apply de-emphasis

← Older revision		Revision as of 05:13, 9 October 2021
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	* [https://club.myce.com/t/will-clarity-and-quality-of-copied-cds-remain-exactly-the-same/57755#post400909 Will clarity and quality of copied CDs remain exactly the same]		* [https://club.myce.com/t/will-clarity-and-quality-of-copied-cds-remain-exactly-the-same/57755#post400909 Will clarity and quality of copied CDs remain exactly the same]

	== Software ~~to made~~ de-emphasis ==		== Software-based de-emphasis ==
	cddeemph tool		cddeemph tool
	* http://rutracker.org/forum/viewtopic.php?t=4854775		* http://rutracker.org/forum/viewtopic.php?t=4854775

209.150.240.145: /* Pre-emphasis on audio CD in computers */ Got rid of rather abrasive and combative accusation of the listener's ears.

2021-04-14T16:50:10Z

Pre-emphasis on audio CD in computers: Got rid of rather abrasive and combative accusation of the listener's ears.

← Older revision		Revision as of 16:50, 14 April 2021
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	Most OSes and drives nowadays, by default, instead use a digital interface to send the raw audio data straight from the disc, through the drive's regular connectors (IDE/ATAPI, SCSI, USB, whatever) and into the operating system, which passes it along to whatever program needs it. This is the only method used in DAE (digital audio extraction). During playback, the soundcard's DAC is converting the CD's audio data into analog signals, and the volume control for it is usually just the Wave volume control, as is used for most other sounds originating inside the computer. The soundcard usually has no ability to do de-emphasis, and even if it could, it has no access to info about the presence of pre-emphasis, because it's just being fed the waveform data, not the disc's subcode.		Most OSes and drives nowadays, by default, instead use a digital interface to send the raw audio data straight from the disc, through the drive's regular connectors (IDE/ATAPI, SCSI, USB, whatever) and into the operating system, which passes it along to whatever program needs it. This is the only method used in DAE (digital audio extraction). During playback, the soundcard's DAC is converting the CD's audio data into analog signals, and the volume control for it is usually just the Wave volume control, as is used for most other sounds originating inside the computer. The soundcard usually has no ability to do de-emphasis, and even if it could, it has no access to info about the presence of pre-emphasis, because it's just being fed the waveform data, not the disc's subcode.

	In other words, even though a CD drive may be capable of detecting pre-emphasis flags in the disc's subcode and/or TOC, this information is usually completely ignored when sending audio data through the digital interface. So when you play a CD through your computer, or use CD ripping software to get the audio content, you're probably getting the pre-emphasized audio data. Since it has not been de-emphasized, it will probably sound too "bright" and/or hissy (although your audio equipment ~~or your damaged ears~~ may keep you from noticing). Therefore you may want to do de-emphasis processing yourself.		In other words, even though a CD drive may be capable of detecting pre-emphasis flags in the disc's subcode and/or TOC, this information is usually completely ignored when sending audio data through the digital interface. So when you play a CD through your computer, or use CD ripping software to get the audio content, you're probably getting the pre-emphasized audio data. Since it has not been de-emphasized, it will probably sound too "bright" and/or hissy (although your audio equipment may keep you from noticing). Therefore you may want to do de-emphasis processing yourself.

	===De-emphasis processing===		===De-emphasis processing===

Beardgoggles: /* External links */ Updated links with actual page names.

2019-07-31T20:39:21Z

External links: Updated links with actual page names.

← Older revision		Revision as of 20:39, 31 July 2019
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	==External links==		==External links==
	;The following threads & articles contain useful information:		The following threads & articles contain useful information:
	* http://www.stevehoffman.tv/forums/showthread.php?t=88541		* [http://www.stevehoffman.tv/forums/showthread.php?t=88541 CD/DAT with pre-emphasis: how to de-emphasize correctly?]
	* http://web.archive.org/web/20090324083651/http://www.rogernichols.com/EQ/EQ-2003-07-08.htm		* [http://web.archive.org/web/20090324083651/http://www.rogernichols.com/EQ/EQ-2003-07-08.htm De-emphasis on DC]
	* http://www.digital-inn.de/exact-audio-copy-english/19034-pre-emphasis-use-eac.html		* [https://web.archive.org/web/20100808090815/http://www.digital-inn.de/exact-audio-copy-english/19034-pre-emphasis-use-eac.html Pre-emphasis and use in EAC]
	* ~~http~~://www.dsprelated.com/~~showmessage~~/2587/1.php		* [https://www.dsprelated.com/showthread/comp.dsp/2587-1.php A Basic Question or two on CD Emphasis/Deemphasis]
	* ~~http~~://~~www.hydrogenaudio~~.~~org/forums~~/index.php~~?showtopic=~~38312~~&view=findpost&p=338577~~		* {{ha\|https://hydrogenaud.io/index.php/topic,38312.msg338577.html#msg338577\|<nowiki>EAC changes the EQ [moderation: only via pre-/de-emphasis]</nowiki>}}
	* ~~http~~://club.myce.com/~~f57~~/will-clarity-quality-copied-cds-remain-exactly-same~~-64708~~/#post400909		* [https://club.myce.com/t/will-clarity-and-quality-of-copied-cds-remain-exactly-the-same/57755#post400909 Will clarity and quality of copied CDs remain exactly the same]

	== Software to made de-emphasis ==		== Software to made de-emphasis ==

92.62.53.27: Changed ""audiophile quality filter" in cddemph description to "80-bit floating point for processing" for more specific info. Info about 80-bit floating point taken from https://rutracker.org/forum/viewtopic.php?t=4854775

2018-06-19T16:34:40Z

Changed ""audiophile quality filter" in cddemph description to "80-bit floating point for processing" for more specific info. Info about 80-bit floating point taken from https://rutracker.org/forum/viewtopic.php?t=4854775

← Older revision		Revision as of 16:34, 19 June 2018
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	Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:		Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:
	* '''cddeemph''' (Windows) - processes multiple WAV files ~~with audiophile quality filter~~. http://rutracker.org/forum/viewtopic.php?t=4854775;		* '''cddeemph''' (Windows) - processes multiple WAV files using 80-bit floating point for processing. http://rutracker.org/forum/viewtopic.php?t=4854775;

	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.

Pcm1794: /* De-emphasis processing */

2014-10-28T19:12:55Z

De-emphasis processing

← Older revision		Revision as of 19:12, 28 October 2014
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	Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:		Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:
	* '''cddeemph''' (Windows) - processes multiple WAV files with audiophile quality filter. ~~link1:~~ http://rutracker.org/forum/viewtopic.php?t=4854775;		* '''cddeemph''' (Windows) - processes multiple WAV files with audiophile quality filter. http://rutracker.org/forum/viewtopic.php?t=4854775;
	~~link2: http://letitbit.net/download/14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html~~
	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.
	* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.		* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.

Pcm1794: /* De-emphasis processing */

2014-10-28T19:11:43Z

De-emphasis processing

← Older revision		Revision as of 19:11, 28 October 2014
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	Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:		Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:
	* '''cddeemph''' (~~win32~~) - processes WAV files with audiophile quality filter. link1: http://rutracker.org/forum/viewtopic.php?t=4854775;		* '''cddeemph''' (Windows) - processes multiple WAV files with audiophile quality filter. link1: http://rutracker.org/forum/viewtopic.php?t=4854775;
			link2: http://letitbit.net/download/14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html
	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.
	* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.		* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.

Pcm1794: /* De-emphasis processing */

2014-10-28T19:10:46Z

De-emphasis processing

← Older revision		Revision as of 19:10, 28 October 2014
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	Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:		Some audio processing software can apply a de-emphasis filter to already-extracted audio (files on disk), producing new files:
			* '''cddeemph''' (win32) - processes WAV files with audiophile quality filter. link1: http://rutracker.org/forum/viewtopic.php?t=4854775;
	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.
	* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.		* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.
	* '''cddeemph''' (win32) - processes WAV files link1: http://rutracker.org/forum/viewtopic.php?t=4854775;

	Some audio software can apply a de-emphasis filter during playback or conversion:		Some audio software can apply a de-emphasis filter during playback or conversion:

Pcm1794: /* De-emphasis processing */

2014-10-28T19:08:56Z

De-emphasis processing

← Older revision		Revision as of 19:08, 28 October 2014
Line 32:		Line 32:
	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.
	* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.		* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.
	* '''cddeemph''' (win32) - processes WAV files ~~link~~:http://rutracker.org/forum/viewtopic.php?t=4854775;		* '''cddeemph''' (win32) - processes WAV files link1: http://rutracker.org/forum/viewtopic.php?t=4854775;

	Some audio software can apply a de-emphasis filter during playback or conversion:		Some audio software can apply a de-emphasis filter during playback or conversion:
	* '''foobar2000''' (Windows) - this media player can be configured to use any of the plug-ins below.		* '''foobar2000''' (Windows) - this media player can be configured to use any of the plug-ins below.

Pcm1794: /* De-emphasis processing */

2014-10-28T19:07:35Z

De-emphasis processing

← Older revision		Revision as of 19:07, 28 October 2014
Line 32:		Line 32:
	* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.		* '''WaveEmph''' (Windows) - processes one WAV file at a time, and can optionally apply a volume gain at the same time. Note: after unzipping, right-click on the .exe and set Win98 compatibility before running it for the first time.
	* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.		* '''SoX''' (multi-platform) - a command-line app which can be invoked with a <code>deemph</code> parameter to apply a de-emphasis filter; e.g. <code>sox input.wav output.wav deemph</code>.
			* '''cddeemph''' (win32) - processes WAV files link:http://rutracker.org/forum/viewtopic.php?t=4854775;

	Some audio software can apply a de-emphasis filter during playback or conversion:		Some audio software can apply a de-emphasis filter during playback or conversion:

Pcm1794: /* Software to made de-emphasis */

2014-10-28T19:06:20Z

Software to made de-emphasis

← Older revision		Revision as of 19:06, 28 October 2014
Line 55:		Line 55:
	== Software to made de-emphasis ==		== Software to made de-emphasis ==
	cddeemph tool		cddeemph tool
			* http://rutracker.org/forum/viewtopic.php?t=4854775
	* http://letitbit.net/download/14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html		* http://letitbit.net/download/14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html
	* http://vip-file.com/downloadlib/129389504892840400-14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html		* http://vip-file.com/downloadlib/129389504892840400-14992.1be051993ba100ce9cb7ae8d4e9c/cddeemph.rar.html