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Topic: Lossless Audio

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	Audio data compression - Wikipedia, the free encyclopedia
		Audio compression is a form of data compression designed to reduce the size of audio files.
		The primary users of lossless compression are audio engineers, audiophiles and those consumers who want to preserve the full quality of their audio files, in contrast to the quality loss from lossy compression techniques such as Vorbis and MP3.
		Perhaps the earliest algorithms used in speech encoding (and audio data compression in general) were the A-law algorithm and the mu-law algorithm.
	en.wikipedia.org /wiki/Audio_data_compression (2084 words)

	Lossless data compression - Wikipedia, the free encyclopedia
		Lossless data compression is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data.
		Lossless compression is used when it is important that the original and the decompressed data be identical, or when no assumption can be made on whether certain deviation is uncritical.
		For example, while the process of compressing the error in the above-mentioned lossless audio compression scheme could be described as delta compression from the approximated sound wave to the original sound wave, the approximated version of the sound wave is not meaningful in any other context.
	en.wikipedia.org /wiki/Lossless_data_compression (1170 words)

	Radified Guide to lossless audio compression [loss less]
		Lossless codecs merely shrink the size of the original file/song by >compressing< it [usually by half].
		The folks who hang out at the Hydrogen Audio forums use FLAC as their lossless codec of choice, because it allows everyone to participate in listening tests, regardless of which operating system they use.
		Lossless codecs represent the holy grail of audio archiving, as far as fidelity is concerned.
	mp3.radified.com /lossless.htm (2358 words)

	Lossless and lossy audio formats for music.
		Even though lossless audio is a perfect copy of the original, a file created with lossless compression will not be as small as a file created with lossy compression.
		Using a lossless audio file is as good as using the actual source; but creating audio files automatically (using suitable software) from an entire archive of existing lossless audio files is a lot quicker than copying from the original source (e.g.
		One lossless audio format that is designed to compress the data is FLAC (Free Lossless Audio Codec).
	www.bobulous.org.uk /misc/audioFormats.html (3099 words)

	Compression Links: Lossless Audio Coding area
		Lossless audio compression is demanded in audio processing and, recently, by audiophiles.
		The goal is to offer real transparent audio coding (not only perceptually transparent) at half or less the bitrate generally used by lossless coding, and also to permit progressive consistent increase of the quality level, until lossless coding is reached.
		Like other lossless compression schemes the data reduction varies with the source, but it is generally between 25% and 50% for typical popular music and somewhat better than that for classical music and other sources with greater dynamic range.
	www.compression-links.info /Lossless_Audio_Coding (2073 words)

	Lossless - Hydrogenaudio Knowledgebase
		Lossless compression is a compression methodology in which the result of the compression can be restored faithfully, i.e.
		As lossless compression preserves all information of the original Waveform file, audio compressed with lossless compression will unavoidably be larger than audio compressed with lossy compression.
		Lossless audio formats - A comparison of the rip-and-encode speed and album file size of six different lossless formats: uncompressed Wave, FLAC, WavPack, Shorten, Monkey's Audio, and OptimFROG.
	wiki.hydrogenaudio.org /index.php?title=Lossless (368 words)

	True Audio Codec Software - TTA Lossless Audio Codec - Realtime Audio Compressor
		The TTA lossless audio codec performs lossless compression on multichannel 8, 16 and 24-bit data of WAV audio files.
		The term "lossless" refers to the fact that such compression results in literally no data or quality loss; when decompressed, the audio file data are bit-identical to those of their originals.
		The TTA lossless audio codec allows for the storage of up to 20 audio CDs worth of music on a single DVD-R, retaining the original CD quality audio, plus detailed information in the popular ID3 tag format.
	www.true-audio.com /Codec.project (309 words)

	audio scalable lossless
		The lossless enhancement is done in a fine-grain scalable way, allowing for signal representations from the quality of the AAC core to numerically lossless, including near-lossless signal representation.
		MPEG-4 SLS is motivated by applications that require audio quality beyond perceptual transparency such as archive applications which require lossless compression, or studio operation which requires additional coding margin for post-processing or tandem coding.
		While pure lossless codecs can provide an average compression of 2:1 for certain test material, this compression cannot be guaranteed, and thus a transmission at a reduced constant bitrate is not possible.
	www.chiariglione.org /mpeg/technologies/mp04-sls (634 words)

	Digital Compression
		Lossless compression is the only way to preserve the "CD Quality" level of your program material.
		One proponent of Lossless Compression is Etree.org a music distribution hub but not for audio that has been compressed in a lossy fashion like MP3 or AAC but for audio that has been compressed in a lossless way.
		Etree.org uses the Shorten (.shn) audio compression format because it creates an exact clone of the original source.
	www.puredigitalaudio.org /digitalcompression/index.shtml (713 words)

	Lossless comparison - Hydrogenaudio Knowledgebase
		Given the enormous amount of lossless audio compressor choices available, it is a very difficult task to choose the one most suited for each person's needs.
		WMA Lossless is the lossless codec developed by Microsoft to be featured in their Windows Media codec portfolio.
		Lossless Audio Blog - by windmiller, is a reliable and complete source of news about lossless compression.
	wiki.hydrogenaudio.org /index.php?title=Lossless_comparison (679 words)

	Sub 50% ratio Lossless Audio Compression (Site not responding. Last check: 2007-09-21)
		Lossless audio is primarily used for editing, and then it is compressed with a lossy codec for distribution.
		Is there a use for lossless audio codecs these days, seeing as) everyone is so in bed with MP3, ORG etc etc Given the existence of FLAC, I would say that lossless audio encoding is in use, dunno how widespread.
		A lot of people now seem to be adopting lossless compression, e.g., Flac or Shorten, for their "primary" archives ripped from CD, and then decompressing and re-encoding into whatever lossy format is appropriate for their portable music devices.
	www.codecomments.com /message288914.html (940 words)

	Fraunhofer IIS - Audio & Multimedia Realtime Systems - Lossless Audio Coding
		Lossless audio coding schemes offer audio data compression, with the decoded audio data being bit by bit identical to the original audio data.
		There is a number of important applications for lossless audio coding schemes, even though their compression ratio is far from that of modern perceptual audio coding schemes.
		On top of MPEG-4 AAC, a scalable extension layer increases the signal-to-noise-ratio, reaching losslessness at data rates comparable to that of current pure lossless audio codecs, that is, at average compression ratios of about 50%.
	www.iis.fraunhofer.de /amm/projects/losslessaudio (261 words)

	Lossless audio compression
		The question of compressing audio without any loss of quality (including especially without having to even think about how lossy a lossy algorithm is, because the binary bits are fully restored) is obviously important.
		FLAC (Free Lossless Audio Coder) was released in an Alpha form on 10 December 2000.
		In a lossless audio compression program, a major task is to store a larege body of signed integers of varying lengths.
	www.firstpr.com.au /audiocomp/lossless (8593 words)

	LPAC - Lossless Predictive Audio Compression
		LPAC is a codec (coder / decoder) for lossless compression of digital audio files.
		"Lossless" means that any compressed file can be decompressed in a way it will be bit-wise identical with the original.
		They are supplied for people interested in audio compression and may be used by anyone for a noncommercial purpose.
	www.nue.tu-berlin.de /wer/liebchen/lpac.html (1705 words)

	Lossless audio compression
		Links to material concerning the lossless compression (data reduction) of digital audio signals, including some other programs (such as RAR) which I did not test as fully as those listed above, because initial tests indicated their compression ratios were not as good.
		Audio files contain a certain amount of information - "entropy" - so they cannot be compressed losslessly to any size smaller than that.
		Thanks to Alexandre Enkerli for alerting me to this.) A new algorithm suitable for lossless or lossy compression of audio and other similar signals has been developed by DAKX in North Carolina: http://www.dakx.com The algorithm is patented in the US: http://www.patents.ibm.com/details?patent_number=5825830.
	www.firstpr.com.au /audiocomp/lossless/index1998.html (4812 words)

	First Look: Apple Lossless Audio
		ITunes 4 already had the ability to import audio from a CD, convert audio to compressed, compact AAC or MP3 audio, burn music to CDs, and load files onto the iPod, but the best new feature in iTunes 4.5 is probably the new Apple Lossless encoder.
		Apple Lossless provides full uncompressed CD quality audio in about half the space of the original file, answering the call by discriminating musical ears for a format that offered both compression and high-quality audio.
		A similar audio codec is FLAC (Free Lossless Audio Codec), mostly used for legal distribution of live music on the net, but according to Apple sources, their codec is faster and not based on FLAC.
	www.macmusic.org /news/view.php/lang/en/id/1748 (405 words)

	MediaCoder Audio Video Glossary
		Windows Media Audio 9 Lossless is a lossless data lossless audio codec by Microsoft, released in early 2003.
		It compresses an audio CD to a range of 206 to 411MB, at bit rates of 470 to 940 Kbps.
		WMA codecs once were only lossy, but with the release of Windows Media Encoder 9 Series, Microsoft provided the option of lossless compression.
	mediacoder.sourceforge.net /glossary/wma-lossless.htm (118 words)

	Lossless audio formats comparison
		Even though lossless files are relatively large, there are a small number of portable music players that support playback of FLAC files.
		Its average lossless compression rate is 76KB per second of the album.
		To make sure that the audio stored in each lossless format really is the same as the original audio source, I used an uncompressed Wave file of Canon in D major from The Essential Classics Collection.
	www.bobulous.org.uk /misc/lossless_audio_2006.html (1931 words)

	TTA Lossless Audio Compressor - Hydrogenaudio Forums
		Monkey's Audio Normal (-c2000): 9.4 sec, compressed size - 51 685 552 bytes, time to unpack - 12.8 sec.
		Monkey's Audio High (-c3000): 10.9 sec, compressed size - 51 527 580 bytes, time to unpack - 14.3 sec.
		And of course, they chose to benchmark FLAC and Monkey's Audio in their least efficient modes only, which obscures the fact that there exist better codecs than TTA for any measure of "better" (faster encoding, more compression, encoder speed-to-compression ratio efficiency, decoder speed-to-compression ratio efficiency, etc.)
	www.hydrogenaudio.org /forums/index.php?showtopic=13925 (768 words)

	The Lossless Audio Blog
		The Transporter is a full sized networked audio component with all of the features you would expect and then some.
		There have quite a few useful audio utilities surfacing lately, one of those being the Album Art Fixer.
		Album Art Fixer scans your audio files and then determines what needs to be "fixed", it gives you the option of fixing the cover art, album title, location and most importantly the album artist tag.
	losslessaudio.blogspot.com (857 words)

	The Traders' Den - FAQ: The Traders' Den FAQ
		The exception to this rule is that DVDs which have been authored with uncompressed LPCM audio are allowed to have the audio stream extracted, compressed to a lossless format, and seeded.
		This rule does not apply to audio taken from VHS sources, which is permitted with the caveat that no cleaner or higher fidelity version circulates.
		Audio from VCD and SVCD sources is explicitly prohibited as it uses MPEG layer 2 compression, a less complex form of the shunned mp3 codec.
	www.thetradersden.org /forums/faq.php?faq=new_faq_item (5602 words)

	FLAC - Free Lossless Audio Codec
		Volvo's Digital Jukebox, developed with PhatNoise, is fully integrated with the car's audio system and available for the S60, V70, XC70, and S80.
		Grossly oversimplified, FLAC is similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality.
		It is the first truly open and free lossless audio format.
	flac.sourceforge.net (504 words)

	FLAC - comparison
		As far as I know, only two of the lossless encoders out there (FLAC and WavPack) are both actively developed and truly free (source code for Shorten and Monkey's Audio is available but the licenses are more restrictive).
		Most others give out free binaries, but without access to the source or the format specification, you are leaving your data to the whim of the maintainer for eternity; you have no alternative software to use, and no way to port the program to another OS or fix it if it breaks.
		Apple Lossless was tested on a newer machine (P4-2.4GHz Windows 2000); only the overall encoding and decoding times are shown, and the times are scaled to the PII-333 by multiplying by the ratio of flac times on the PII to P4.
	flac.sourceforge.net /comparison.html (1431 words)

	Lossless Transform Audio Compression (Site not responding. Last check: 2007-09-21)
		LTAC (Lossless Transform Audio Compression) allows for lossless audio compression of PCM coded audio signals (16 bit), i.e.
		LTAC is a result of the RandD activities at the Institute of Telecommunications in the field of lossless audio coding.
		More documents on lossless audio coding can be found on my publications page.
	www.nue.tu-berlin.de /wer/liebchen/ltac.html (363 words)

	True Audio Codec Software - The World of True Audio (Site not responding. Last check: 2007-09-21)
		True Audio encourages open collaboration, and we invite you to contact us anytime by e-mail at info@true-audio.com (mailto:info@true-audio.com).
		By evaluating the character of audio data a CD contains, Tau Analyzer can distinguish between original studio-based recordings and those that have been "reconstructed" using a lossy audio source, such as MP3.
		True Audio (TTA) command line encoder (http://prdownloads.sourceforge.net/tta/ttaenc-3.3.zip?download) - is a free console-based real-time lossless audio compressor.
	tta.corecodec.org (398 words)

	Hydrogenaudio Forums
		Omni Encoder is a multi-format audio conversion utility (front-end).
		I'm glad to announce the first public release of my port of Jürgen Faul, Gambit and the MAC team's baby, initially written for Borland Delphi.
		As for the Delphi version, the source of its port is entirely available and ready to use for any C# programmer.
	www.hydrogenaudio.org (655 words)

	Comparison of lossless audio compressors
		There are other things that might influence the choice for a certain compressor, such as: availability for your platform / cross platform usability, open/closed source, error resistancy, nice GUI, on-the-fly ripping/compressing, random access while playing, low CPU usage while playing, hardware player for the format, etc. I'm not going into those differences here.
		But the complicated algorithms used for such extreme compression ratios lead to slow encoding and decoding and a high CPU load during playback.
		Monkey's Audio at Extra High level is on the third place and OptimFROG default is fourth.
	members.home.nl /w.speek/comparison.htm (428 words)

	Audio Talk! - lossless audio codec for video capturing
		I'm looking for a lossless audio codec to capture video.
		I installed various lossless audio codecs such as FLAC 1.1.0, Monkey 3.97,
		I want to use a lossless audio as an "intermediate" codec.
	www.allaudio.org /detail-6963024.html (1143 words)

	EtreeWiki - Etree Wiki
		Look up SourceAbbreviations here to figure how your new CDs were recorded and transferred to lossless audio format.
		Shorten (SHN) is the lossless audio compression codec that we use.
		FLAC is a new, free lossless audio codec which may supplant SHN in the future.
	wiki.etree.org (396 words)

	WavPack Audio Compression
		WavPack is a completely open audio compression format providing lossless, high-quality lossy, and a unique hybrid compression mode.
		This makes lossless mode ideal for archiving audio material or any other situation where quality is paramount.
		Instead of creating a single file, this mode creates both a relatively small, high-quality lossy file that can be used all by itself, and a "correction" file that (when combined with the lossy file) provides full lossless restoration.
	www.wavpack.com (563 words)

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