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	Lossy data compression - Wikipedia, the free encyclopedia
		A lossy data compression method is one where compressing data and then decompressing it retrieves data that may well be different from the original, but is "close enough" to be useful in some way.
		Lossy data compression is used frequently on the Internet and especially in streaming media and telephony applications.
		Flaws caused by lossy compression that are noticeable to the human eye or ear are known as compression artifacts.
	en.wikipedia.org /wiki/Lossy_compression (742 words)

	Audio data compression - Wikipedia, the free encyclopedia
		Codecs such as FLAC, Shorten and TTA use linear prediction to estimate the spectrum of the signal.
		Most lossy compression schemes allow compression parameters to be adjusted to achieve a target rate of data, usually expressed as a bit rate.
		Lossy formats are often used for the distribution of streaming audio, or interactive applications (such as the coding of speech for digital transmission in cell phone networks).
	en.wikipedia.org /wiki/Audio_data_compression (2093 words)

	Radified Guide to lossless audio compression [loss less] (Site not responding. Last check: 2007-10-29)
		Lossy codecs [such as MP3 and Musepack] generate smaller files by discarding selected bits contained in the original songs [bits it thinks you won't notice when they're gone].
		Lossy codecs, on the other hand, do more than compress: they encode, which involves discarding selected bits deemed unnecessary.
		Lossless codecs represent the holy grail of audio archiving, as far as fidelity is concerned.
	mp3.radified.com /lossless.htm (2384 words)

	Lossy audio formats comparison
		Failing an educated recommendation, I chose a setting that should cause the codec to aim for 192Kbits/sec, as this seems to be the bitrate at which artifacts are unlikely to be found in the compressed audio.
		Lossy compression has to do its best to trim down the least important information, but the more information there is crammed into a track, the harder it must be to save space.
		I put a lossless original and five lossy versions of a track into a playlist, and randomly sorted the playlist several times to make sure the files were in an order unknown to me. Then I tried to tell which file was the original, and which were lossy versions.
	www.bobulous.org.uk /misc/lossy_audio_2006.html (1919 words)

	Video File Format Comparison
		Lossy codecs usually let you specify how much picture quality you want to trade to lower the data rate and file size so that you can tailor playback for your audience.
		Lossy compression allows much lower data rates and file sizes than lossless compression, so lossy codecs are commonly used for final production of video delivered using CD-ROM or the Internet.
		A codec is considered symmetrical when it requires the same amount of time to compress as to decompress a clip.
	www.uwm.edu /~price/video_file_format_comparison.html (1737 words)

	Compression artifact - Wikipedia, the free encyclopedia
		Artifacts in time-dependent data such as audio or video are often a result of the latent error in lossy data compression.
		Technically speaking, a compression artifact is a particular class of data error that is usually the consequence of quantization in lossy data compression.
		Where transform coding is used, they typically assume the form of one of the basis functions of the coder's transform space.
	en.wikipedia.org /wiki/Compression_artifact (640 words)

	Apple Music Store: The New 8-Track Tape?
		A lossy codec intentionally does not attempt to encode the full, complete signal waveform independently for each channel.
		The degredation in sound quality resulting from lossy codecs like MP3 and AAC is fundamentally different than the degredation you might get from recording onto a cassette or even conversion to lower resolution PCM.
		If you encode a PCM source like a CD using one lossy codec, then decode back to PCM again and run it through another lossy codec, the result is generally very poor.
	macslash.org /comments.pl?sid=3272&cid=31572 (471 words)

	TechSmith Screen Capture Codec (TSCC)
		Codecs are applied to audio, video and image files to compress their size.
		So, the video codec is responsible for compressing the video frames during recording and for reconstructing the video frames during playback.
		Even codecs that are more widely distributed do not perform as well as the TechSmith codec to deliver the highest quality, smallest file size and fastest compression speed.
	www.techsmith.com /codecs/tscc/default.asp (639 words)

	What is an audio codec?
		Codec's are used to encode audio for storage on digital mediums, such as CD's and computer files.
		Audio codec's are also used to transmit audio over digital transmission lines, such as SPDIF.
		Audio codecs generally fall into two groups, codecs that use lossy compression and those that use lossless compression.
	www.tech-faq.com /audio-codec.shtml (95 words)

	Review - SheerVideo Pro codec for Mac OS X
		The two main kinds of codecs are those that achieve smaller files by throwing away information (lossy codecs) and those that preserve every bit of information (lossless codecs).
		Lossy codecs are very common in the professional video world.
		SheerVideo codec from BitJazz which is the subject of this review find the most use in a post production workflow where picture quality must be maintained as the video gets edited, effects added and passed from program to program.
	www.kenstone.net /fcp_homepage/review_sheer_video.html (906 words)

	TERENA's Guide to Network Resource Tools :: Codecs (Site not responding. Last check: 2007-10-29)
		A lossless CODEC recreates the original input exactly bit by bit, while with a lossy CODEC some information is discarded.
		Lossless CODECs are not able to achieve the large compression ratios necessary to compress audio and video to a degree where it can be transmitted over common data networks, so lossy CODECs are commonly used.
		When dealing with lossy CODECs it is important to notice that what is standardised is almost always the format of the bit stream and the action of the decoder, whereas the implementation approach of the coder is left unspecified, except for the fact that it must produce a bit stream conforming to the standards.
	gnrt.terena.nl /content.php?section_id=30 (1329 words)

	MediaCoder Audio Video Glossary
		The innovation of lossy audio compression was to use psychoacoustics to recognize that not all data in an audio stream is perceived by the human ear.
		Because data are removed during lossy compression and cannot be recovered by decompression, lossy compression schemes are completely unsuitable for archival storage.
		For these and other reasons, lossy compression is not appropriate for many audio applications.
	mediacoder.sourceforge.net /glossary/lossy.htm (1364 words)

	Digital Video Codec Choices, Part 1
		Lossy codecs, on the other hand, only return an approximation of the data that went into the compressor.
		Typically there is a direct tradeoff between the quality of the output of a codec and the level of compression it is able to achieve.
		Many lossy codecs can achieve 10:1 compression or more without visible degradation of the image.
	www.synthetic-ap.com /qt/codec1.html (1226 words)

	Microsoft Windows Media - Optimizing Low Bit Rate Audio
		All codecs, whether they are designed to work with audio data or data contained in a spreadsheet, compress content by removing data.
		A lossless codec may be used to compress text documents, for example, where an approximation is not good enough.
		The job of a digital media codec is to effectively control the type of data that is removed, so that the compressed audio has the best sound possible.
	www.microsoft.com /windows/windowsmedia/howto/articles/OptimizingLowBitRate.aspx (2256 words)

	SoundCodecs < Main < TWiki
		These codecs typically achieve a filesize of 50%-60% of the original filesize, but the audio playback will be bit-for-bit identical to the original file.
		I guess the MIDI codec would have to be more of a plug-in, as it loads the entire file at once and then plays it from memory...
		Codecs should be a good deal faster than this to allow for buffering, crossfading etc. though.
	www.rockbox.org /twiki/bin/view/Main/SoundCodecs (2604 words)

	What is a Codec?
		Codec stands for Coder-Decoder (some say Compressor-Decompressor) and is used to describe anything which turns data into another form for storage or transmission, then changes it back for use.
		In traditional broadcasting, a codec is a physical device which turns analog video and audio data into digital form to be sent out over the air.
		A lossy codec may be transformative, predictive, or a combination of both.
	www.wisegeek.com /what-is-a-codec.htm (614 words)

	PC Answers - Tutorials - Video codecs
		Video compressed with a lossy codec isn’t the same as the original footage, as information is discarded during compression to reduce the file size.
		The codec then passes the decompressed info back to the player program you’re using, whether it be Windows Media Player or a third-party application like Winamp.
		This modular nature means codecs can be used by any application to play video files without the programmer having to write their own decompression routines every time.
	www.pcanswers.co.uk /tutorials/default.asp?pagetypeid=2&articleid=30900&subsectionid=781&subsubsectionid=744 (1212 words)

	Digital audio gets an audition: Part two: lossy compression - 1/18/2001 - EDN (Site not responding. Last check: 2007-10-29)
		Consider a lossy codec's ability to compress audio files not to half their size but to a guaranteed 1/12 (MP3) or even 1/24 (WMA) compression ratio, with little-to-no degradation perceived in playback quality.
		If temporal masking had occurred as part of lossy compression, you would see an interval with a reduced amplitude or a completely silent interval in the lossy-compression clips just prior to the onset of the "normal" audio material (at the 50-msec point in the original WAV file).
		Also note that all three lossy codecs appear to have preserved at least some of the channel-to-channel phase differences present in the original; one channel is a mirror image of the other.
	www.edn.com /ednmag/article/CA74935.html (5553 words)

	Continuing codec capers (continued) - 12/1/2000 - CommVerge (Site not responding. Last check: 2007-10-29)
		The first installment in this project, September's "Codec capers," benchmarked various lossless audio-compression algorithms and provided a sneak peek at lossy compression.
		This decision meant that for nearly all of the frames of time-to-frequency-transformed information—each several hundreds or several thousands of samples long—the encoder was able to devote all of the available compressed audio bits to just that frequency, dramatically simplifying its job as compared to real-life, multifrequency music.
		However, when I find that one codec sounds particularly better or worse at a given bit rate, I won't be shy about mentioning it (especially given my newfound confidence in my ears, which are apparently more gold and less tin than I previously believed—see the sidebar "Don't consume(r) the water(mark)").
	www.edn.com /article/CA55481.html (3586 words)

	which lossy codec? - Hydrogenaudio Forums
		I need a codec that is almost transparent to most listeners, and has a average bit rate that is in the 128kbs - 192kbs range.
		However a codec that can also be used to reasonably transcode into other formats would be nice, but not necessary.
		Please recommend a codec, and a switch for that codec that is in the 128kbs - 192kbs range.
	www.hydrogenaudio.org /forums/index.php?showtopic=2663 (534 words)

	Articles - Ogg (Site not responding. Last check: 2007-10-29)
		Files ending in the.ogg extension may be of any Ogg media filetype, and because the format is free, Ogg´s various codecs have been incorporated into a number of different free and commercial media players.
		The ´´Ogg´´ bitstream format, spearheaded by the Xiph.org Foundation, has been created as the framework of a larger initiative aimed at developing a set of components for the coding and decoding of multimedia content which are both freely available and freely re-implementable in software.
		Ogg containers may contain multiple codecs, for example, an audio video file may contain data encoded by both an audio codec and a video codec.
	www.zdiamond.net /articles/Ogg (628 words)

	Vorbis.com: FAQ
		I've heard that Vorbis is a "lossy" codec.
		Lossy compression algorithms discard data in order to compress it better than would normally be possible.
		This change in terminology was brought about by a tuning of the variable-bitrate algorithm that produces better sound quality for a given average bitrate, but which does not adhere as strictly to that average as a target.
	www.vorbis.com /faq (2565 words)

	Worried about depending on RED codec - DVXuser.com -- The online community for filmmaking
		Wavelet codecs are lossy, which to me defeats much of the purpose of this camera.
		David Newman's Cineform 10-bits codec is well-known for its lossless quality and it is the Silicon Imaging/Cineform camcorder basis.
		If a highly-compressed GOP codec is really needed then I would rather see RED develop their own codec instead of using HDV.
	www.dvxuser.com /V6/showthread.php?t=55590 (720 words)

	EETimes.com - E-commerce comes to portable apps
		The lossless feature is important; a lossy codec might remove statistics from the ink that are vital to handwriting recognizers or signature verification software.
		RAM requirements for the ink codec were kept to a minimum, with no writable static variables and minimal stack use.
		One method of producing a Java version of the ink codec would be to define a Java API that was similar to the C API and use the Java Native Interface to bridge the C and Java worlds.
	www.eetimes.com /news/latest/showArticle.jhtml?articleID=18304948 (1987 words)

	True Audio Codec Software - Lossy data compression (Site not responding. Last check: 2007-10-29)
		This type of compression is used frequently on the Internet and especially in streaming media and telephony applications.
		Depending on the design of the format lossy data compression often suffers from generation loss, that is compressing and decompressing multiple times will do more damage to the data than doing it once.
		The image is an excerpt of the image of Lena, a de facto industry-standard test image.
	www.true-audio.com /Lossy_data_compression (658 words)

	dBpowerAMP
		Codec is short for COmpression and DECcompression, they add extra reading (Decoding) and writing (Encoding) abilities to dBpowerAMP [ Audio Player
		There are two types of compression: Lossy where audio quality is lost (and is lost forever when compressed) in order to have smaller audio files and Lossless where no audio quality is lost (just like zip compression).
		In addition there are Utility Codecs which perform useful actions on existing audio files (such as rename based upon ID Tag).
	www.dbpoweramp.com /codec-central.htm (300 words)

	Free Software Downloads and Software Reviews - Download.com
		Some codecs, such as FLAC, are described as lossless because they retain the true multitude of sounds in a given audio track.
		As such, lossless codecs tend to be bigger files.
		In most cases, lossy codecs do the job quite well; for instance, MP3 (the most commonly used lossy codec) is perfectly adequate for most everyday listeners.
	www.download.com /Audio-Codec-Shoot-Out/1200-20-5146271.html (328 words)

	Free-Codecs.com :: Download Ogg Vorbis 1.1.1 : Ogg Vorbis is a high-quality lossy audio codec
		Ogg Vorbis is a high-quality lossy audio codec which is free of intellectual property restrictions (like those surrounding MP3).
		- Vorbis is a “lossy” codec, this means that lossy compression algorithms discard data in order to compress it better than would normally be possible.
		This new scale of measurement is not tied to a quantifiable characteristic of the stream, like bitrate, so it's a fairly subjective metric, but provides a more stable basis of comparison to other codecs and is relatively future-proof.
	www.free-codecs.com /download/Vorbis.htm (1546 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		The DV codec, however, uses a relatively modest compression ratio of about 5:1, in contrast to 60-70:1 for many web-based pictures.
		Technically, the DV codec is lossy, but practically, it's as close to lossless as you can get in a reasonably priced camcorder.
		Since the DV codec uses a simple sequence of JPEG frames, it's also easy to process, which means that even low-powered computers can edit DV video with good responsiveness.
	www.eventdv.net /Articles/ReadArticle.aspx?CategoryID=62&ArticleID=8687 (1089 words)

	iTunes, iPod File Types & Quality
		A codec can be either lossless (all information is retained, large file size) or lossy (information is compressed and/or stripped away, smaller file size).
		The discussion of the "best" music codec is the subject of flame wars all over the net.
		When you change/convert from one lossy codec to another the quality is lessened (i.e.
	www.tweakhound.com /itunes/fandq.htm (1297 words)

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