Resampling - Revision history

Drichardson: fix broken link (accidentally made this https instead of http before, which doesn't work)

2019-01-06T00:33:56Z

fix broken link (accidentally made this https instead of http before, which doesn't work)

← Older revision		Revision as of 00:33, 6 January 2019
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	* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/		* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/
	* iZotope 64-bit SRC Precise Sample Rate Conversion: https://web.archive.org/web/20120410075718/http://www.izotope.com/tech/src/		* iZotope 64-bit SRC Precise Sample Rate Conversion: https://web.archive.org/web/20120410075718/http://www.izotope.com/tech/src/
	* Sox Sampling rate conversion. W. G. Unruh 2006: ~~https~~://www.theory.physics.ubc.ca/soundcard/resample.html		* Sox Sampling rate conversion. W. G. Unruh 2006: http://www.theory.physics.ubc.ca/soundcard/resample.html
	* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html		* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html
	* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ISBN 0-13-108989-7		* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ISBN 0-13-108989-7

Drichardson: Update iZotope link to last known working link from Internet Archive's wayback machine, since same content doesn't appear to be available anywhere else

2019-01-06T00:32:33Z

Update iZotope link to last known working link from Internet Archive's wayback machine, since same content doesn't appear to be available anywhere else

← Older revision		Revision as of 00:32, 6 January 2019
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	* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: http://www.audiodesignguide.com/DAC_final/peakResamplingWhitePaper.pdf		* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: http://www.audiodesignguide.com/DAC_final/peakResamplingWhitePaper.pdf
	* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/		* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/
	* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/		* iZotope 64-bit SRC Precise Sample Rate Conversion: https://web.archive.org/web/20120410075718/http://www.izotope.com/tech/src/
	* Sox Sampling rate conversion. W. G. Unruh 2006: https://www.theory.physics.ubc.ca/soundcard/resample.html		* Sox Sampling rate conversion. W. G. Unruh 2006: https://www.theory.physics.ubc.ca/soundcard/resample.html
	* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html		* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html

Drichardson: fix broken/missing link

2019-01-06T00:29:17Z

fix broken/missing link

← Older revision		Revision as of 00:29, 6 January 2019
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	== References ==		== References ==
	* Digital Audio Resampling Home Page: https://ccrma.stanford.edu/~jos/resample/		* Digital Audio Resampling Home Page: https://ccrma.stanford.edu/~jos/resample/
	* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: X		* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: http://www.audiodesignguide.com/DAC_final/peakResamplingWhitePaper.pdf
	* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/		* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/
	* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/		* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/

Drichardson: fix broken links where possible

2019-01-06T00:26:06Z

fix broken links where possible

← Older revision		Revision as of 00:26, 6 January 2019
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	== References ==		== References ==
	* Digital Audio Resampling Home Page: ~~http~~://ccrma~~-www~~.stanford.edu/~jos/resample/		* Digital Audio Resampling Home Page: https://ccrma.stanford.edu/~jos/resample/
	* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: X		* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: X
	* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/		* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/
	* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/		* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/
	* Sox Sampling rate conversion. W. G. Unruh 2006: ~~http~~://~~axion~~.physics.ubc.ca/soundcard/resample.html		* Sox Sampling rate conversion. W. G. Unruh 2006: https://www.theory.physics.ubc.ca/soundcard/resample.html
	* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html		* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html
	* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ISBN 0-13-108989-7		* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ISBN 0-13-108989-7

Mjb: /* Resampling or Sample Rate Conversion */ On the forum we get annoyed when people refer to bit depth changes as resampling, so let's discourage such terminology.

2016-08-24T16:39:56Z

Resampling or Sample Rate Conversion: On the forum we get annoyed when people refer to bit depth changes as resampling, so let's discourage such terminology.

← Older revision		Revision as of 16:39, 24 August 2016
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	Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). [[Red Book]] [[Compact Disc Digital Audio\|Audio CD]]'s sample rate is 44.1kHz (16-bits resolution). Audio on [[DVD]]s is sampled at 96kHz (24-bit resolution). '''Resampling''' or ''Sample Rate Conversion'' is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.1 kHz to 48 kHz); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from 96 kHz to 48 kHz).		Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). [[Red Book]] [[Compact Disc Digital Audio\|Audio CD]]'s sample rate is 44.1kHz (16-bits resolution). Audio on [[DVD]]s is sampled at 96kHz (24-bit resolution). '''Resampling''' or ''Sample Rate Conversion'' is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.1 kHz to 48 kHz); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from 96 kHz to 48 kHz).

	~~Resampling can also be used to describe resolution changes (changes~~ in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).		Changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit, may be performed at the same time as resampling, but care should be taken to avoid conflating the two principles. ''Resampling'' or the more specific terms ''upsampling'' or ''downsampling'' usually mean sample rate conversion only.

	Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2 GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.		Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2 GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.

	Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the Red Book Audio CD spec uses a 44.~~1kHz~~ sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at ~~96kHz~~, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.		Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the Red Book Audio CD spec uses a 44.1 kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96 kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.

	Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 this thread]).		Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 this thread]).

87.112.81.64: /* References */ Removed dead link, resources no longer reachable.

2012-12-20T22:22:24Z

References: Removed dead link, resources no longer reachable.

← Older revision		Revision as of 22:22, 20 December 2012
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	== References ==		== References ==
	* Digital Audio Resampling Home Page: http://ccrma-www.stanford.edu/~jos/resample/		* Digital Audio Resampling Home Page: http://ccrma-www.stanford.edu/~jos/resample/
	* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: ~~http://www.bias-inc.com/products/peakPro5/resampling/peakResamplingWhitePaper.pdf~~		* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: X
	* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/		* Sample Rate Conversion Comparisons (96kHz to 44.1kHz): http://src.infinitewave.ca/
	* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/		* iZotope 64-bit SRC Precise Sample Rate Conversion: http://www.izotope.com/tech/src/

Speckmade at 14:19, 14 June 2007

2007-06-14T14:19:50Z

← Older revision		Revision as of 14:19, 14 June 2007
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	==Resampling or Sample Rate Conversion==		== Resampling or Sample Rate Conversion ==
			Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). [[Red Book]] [[Compact Disc Digital Audio\|Audio CD]]'s sample rate is 44.1kHz (16-bits resolution). Audio on [[DVD]]s is sampled at 96kHz (24-bit resolution). '''Resampling''' or ''Sample Rate Conversion'' is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.1 kHz to 48 kHz); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from 96 kHz to 48 kHz).
	Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). [[Red Book]] ~~Audio~~ [[CD]]'s sample rate is 44.1kHz (16-bits resolution). Audio on [[DVD]]s is sampled at 96kHz (24-bit resolution). '''Resampling''' or ''Sample Rate Conversion'' is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.~~1kHz~~ to ~~48kHz~~); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from ~~96kHz~~ to ~~48kHz~~).

	Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).		Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).

	Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~~~2GHz~~ clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.		Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2 GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.

	Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the Red Book Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.		Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the Red Book Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.
Line 11:		Line 10:
	Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 this thread]).		Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 this thread]).

	==References==		== References ==
	* Digital Audio Resampling Home Page: http://ccrma-www.stanford.edu/~jos/resample/		* Digital Audio Resampling Home Page: http://ccrma-www.stanford.edu/~jos/resample/
	* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: http://www.bias-inc.com/products/peakPro5/resampling/peakResamplingWhitePaper.pdf		* PeakPro 5 Sample Rate Converter Comparison with Other Audio Applications, Bias Inc., December 2005: http://www.bias-inc.com/products/peakPro5/resampling/peakResamplingWhitePaper.pdf

HotshotGG at 21:34, 17 February 2007

2007-02-17T21:34:17Z

← Older revision		Revision as of 21:34, 17 February 2007
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	* Sox Sampling rate conversion. W. G. Unruh 2006: http://axion.physics.ubc.ca/soundcard/resample.html		* Sox Sampling rate conversion. W. G. Unruh 2006: http://axion.physics.ubc.ca/soundcard/resample.html
	* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html		* An Analysis of Sample Rate Conversion in Sox, Andreas Wilde, 19. Dec. 2003: http://www.leute.server.de/wilde/resample.html
	* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ~~<code><nowiki>~~ISBN 0-13-108989-7~~</nowiki></code>~~		* Lyons, Richard G. Understanding Digital Signal Processing. Indiana: Prentice Hall, March 2004: Edition: 3rd ISBN 0-13-108989-7
	* Secret Rabbit Code (aka libsamplerate): http://www.mega-nerd.com/SRC/index.html		* Secret Rabbit Code (aka libsamplerate): http://www.mega-nerd.com/SRC/index.html

	[[Category:Signal Processing]]		[[Category:Signal Processing]]

Pepoluan: /* Resampling or Sample Rate Conversion */

2006-12-12T20:08:05Z

Resampling or Sample Rate Conversion

← Older revision		Revision as of 20:08, 12 December 2006
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	==Resampling or Sample Rate Conversion==		==Resampling or Sample Rate Conversion==

	Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). ~~Redbook~~ Audio CD's sample rate is 44.1kHz (16-bits resolution). Audio on ~~DVDs~~ is sampled at 96kHz (24-bit resolution). Resampling or Sample Rate Conversion is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.1kHz to 48kHz); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from 96kHz to 48kHz).		Digital audio is always sampled, which means that any digital audio file is created with a fixed sample rate (and resolution). [[Red Book]] Audio [[CD]]'s sample rate is 44.1kHz (16-bits resolution). Audio on [[DVD]]s is sampled at 96kHz (24-bit resolution). '''Resampling''' or ''Sample Rate Conversion'' is required when one wants to convert a digital audio file (i.e. an analog audio signal that has already been digitized) from a given sample rate into a different sample rate (resolution can stay the same or change). Upsampling (aka interpolation) is the process of converting from a lower to higher sample rate (e.g. from 44.1kHz to 48kHz); downsampling (aka decimation) is the process of converting from a higher to a lower sample rate (e.g. from 96kHz to 48kHz).

	Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).		Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).
Line 7:		Line 7:
	Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.		Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.

	Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the ~~RedBook~~ Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.		Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the Red Book Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.

	Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see ~~this thread:~~ [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 ~~ALSA sample rate conversion, ALSA uses a poor-quality linear interpolator~~]).		Many PC audio cards (most notably the 10k1 and 10k2 based Creative Labs ones) and AC97 codecs can only input, output or internally process audio data at 48kHz and forcefully resample any digital audio data at one stage or another. Sometimes the audio software or the drivers will add a resampling step (e.g. ALSA when software mixing, see [http://www.hydrogenaudio.org/forums/index.php?showtopic=47591 this thread]).

	==References==		==References==

Gigapod at 23:27, 11 December 2006

2006-12-11T23:27:14Z

← Older revision		Revision as of 23:27, 11 December 2006
Line 5:		Line 5:
	Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).		Resampling can also be used to describe resolution changes (changes in bit depth, e.g. from 16-bit to 24-bit, or from 24-bit to 16-bit).

	Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require ~~tranlation~~ to the frequency domain. Modern PC processors (~2GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.		Low-quality resampling algorithms, whether upsampling or downsampling, can introduce artifacts which are clearly audible in the resampled audio file. A typical low-quality, but extremely fast resampling algorithm will just be based on linear interpolation. High-quality resampling algorithms use more CPU time, since they require translation to the frequency domain. Modern PC processors (~2GHz clock) can easily deal with very high-quality resampling in real time. Sound cards that do resampling in real time require a good DSP.

	Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the RedBook Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.		Resampling is very often required and is in fact part of the audio mastering process for CDs, since professional audio equipment uses 96kHz or 192kHz for masters, whereas the RedBook Audio CD spec uses a 44.1kHz sample rate. Different media are recorded at different sample rates (CD at 44.1kHz, DAT at 48kHz, DVD audio at 96kHz, etc). Digitally mixing different sources sampled at different rates will require resampling to a common rate and resolution.