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Topic: Audio format

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digital audio

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	AU - Audio File Format
		An audio file is composed of three parts: a 24-byte header, a variable-length annotation block, and a contiguous segment of audio data.
		Audio header and data fields are stored in network (big-endian) byte order, regardless of the native byte-order of the machine architecture on which an application may be running.
		Audio data is encoded in the format identified by the file header.
	www.opengroup.org /public/pubs/external/auformat.html (582 words)

	Audio file format - Wikipedia, the free encyclopedia
		The general approach towards storing digital audio formats is to sample the audio voltage (corresponding to a certain position in the membrane of a speaker) in regular intervals (e.g.
		The WAV format is based on the RIFF file format, which is similar to the IFF format.
		BWF (Broadcast Wave Format) is a standard audio format created by the European Broadcasting Union as a successor to WAV.
	en.wikipedia.org /wiki/Audio_file_format (610 words)

	Fx Audio Editor
		Audio files, like all other computer data files, are stored in a binary table which is a series of zeros and ones representing data bits.
		Unfortunately it has become common practice in digital audio to use such a wide variety of file extensions for essentially the same formats that in many cases there is no way to know the actual file format or the codec short of opening the file.
		AIFF, AIF (Apple audio format) not to be confused with Apple QuickTime, AIFF is the Apple native format as WAV is to Windows.
	fxaudioeditor.com /Help/digital_audio_formats.htm (1106 words)

	MP3 audio format: Columbiaisa
		MP3 is a digital audio format developed by Fraunhofer-Gesellschaft and Thompson Multimedia in the late 1980s and brought to the mainstream through the Internet beginning in 1997.
		The format is also popular for turning your PC into a jukebox of hundreds or thousands of songs or loading them into a portable mp3 player and taking your music collection wherever you want.
		As obvious as this may sound, you may be surprised to learn that a good recording stores a tremendous amount of audio data that you never even hear, because recording equipment (microphones, guitar pickups, and so on) is sensitive to a broader range of sounds and audio resolutions than is the human ear.
	www.geocities.com /columbiaisa/audio_formats_mp3.htm (2476 words)

	Audio Formats - wave, mp3, midi
		Your audio will need to be in this format in order to be edited using a wave editor, or burned to an audio CD that will play in your home stereo.
		This alrgorithm removes parts of the audio that theoretically cannot be detected with the human ear; in actuality, there will be some degradation of quality, but this depends on the quality (bitrate) with which you choose to encode the file.
		is a streaming audio format often used by internet radio stations and for posting sound files on websites.
	www.blazeaudio.com /howto/bg-formats.html (581 words)

	Digital Audio Formats
		In other words, audio files, which were typically large (such as WAV files from CDs), could be compressed to a fraction of their original size without a significantly noticeable loss in quality to the human ear.
		WAV is the file format for sound, and it was built into Windows 95, which in essence made it the standard for digital audio.
		Formats 1, 2, and 3 use speech compression at varying levels, while format 4 is a version of MP3 encoded at a low bit rate that works better for spoken word than music and is more efficient for downloading over the Internet.
	www.kendavies.net /resources/audioformats (2534 words)

	Apple - Mac OS X - Core Audio
		The most fundamental measure of audio performance is throughput latency — the time it takes for audio to enter your Mac, travel through the system to your application and then pass back out to your monitoring system (speakers).
		Core Audio Format is the latest addition to the dozens of audio formats supported natively in Mac OS X. Developed by Apple, Core Audio Format (CAF) combines virtually infinite capacity with rich support for metadata in an optimized-for-audio package.
		Audio MIDI Setup allows you to easily manage your MIDI needs and define a system-wide MIDI configuration that is available to all of your applications.
	www.apple.com /macosx/features/coreaudio (958 words)

	dBpowerAMP
		Audio is made up from 1000's of data values, the higher the number of data values the better sounding it will be (up to a point).
		Monkeys Audio is a what you would call a lossless compressor, that is when a monkeys audio file is played the resulting rendition is exactly the same (quality wise) as the original.
		The most basic of all audio formats, in it's native form (PCM) audio data is stored uncompressed, when an Audio CD is converted to a wave file the resulting wave file is 16 Bit, Stereo with a sample frequency of 44.1Khz, this gives 172K bytes per second of audio data, or 10MBs per minute.
	www.dbpoweramp.com /spoons-audio-guide-formats.htm (2437 words)

	Audio Recording History - Gramophone Phonograph Tape Reel Cartridge Wire 78
		Audio quality of belts properly recorded and stored is quite good, and was a quantum leap forward from the low fidelity of wax cylinders.
		Audio quality was actually quite good by the standards of the day, and the 8 track became an instant hit.
		Though the format was fully capable of recording up to all 8 tracks at once in one direction, for reasons unknown, no manufacturer ever made a deck to fully utilize the 8 track discrete potential - most likely due to a very limited market.
	www.videointerchange.com /audio_history.htm (11046 words)

	Digital Audio Formats
		Digital audio comes in many different formats, and multiple formats will be a fact of life for the foreseeable future.
		When PCM audio is transmitted, each “1” is represented by a positive voltage pulse and each “0” is represented by the absence of a pulse.
		Even though MPEG Audio formats are based on open standards and widely used, many companies continue to develop proprietary digital audio formats.
	www.teamcombooks.com /mp3handbook/12.htm (1341 words)

	Audio Interchange File Format
		Audio Interchange File Format (or AIFF) is a file format for storing digital audio (waveform) data.
		This format is very popular upon Apple platforms, and is widely used in professional programs that process digital audio waveforms.
		An Audio IFF file is a collection of a number of different types of chunks.
	www.borg.com /~jglatt/tech/aiff.htm (4780 words)

	With digital audio
		With digital audio, the computer samples the state of the microphone or other input device thousands of times each second and stores numbers in the computer to form a representation of the sound wave.
		Audio on a compact disc is not compressed and gives the user the highest sound quality; when working with the Internet, sound must be compressed to make a smaller file for downloading.
		MPEG is a family of compression formats and audio/video storage formats developed by a cooperative effort under the joint direction of the International Standards Organization (ISO) and the International Electro-Technical Commission (IEC).
	www.uwm.edu /People/price/Audio_file_format_comparison.html (1251 words)

	WAVE Audio File Format
		BWF recommended as the preferred format for the delivery of music recordings to record companies in the Draft Recommendation for Delivery of Recorded Music Projects developed by the Delivery Specifications Committee of the Producer's and Engineer's Wing of the Recording Academy (National Academy of the Recording Arts and Sciences).
		Depends on audio codec employed for bitstream encoding (which may incorporate compression); see LPCM, µ-Law, A-Law, DPCM, and ADPCM.
		Additional metadata is a feature of the bext (Broadcast Audio Extension) associated with WAVE_LPCM_BWF (Broadcast WAVE Audio File Format); additional data is defined for the CART/Audio Delivery Extension to BWF proposed to the Audio Engineering Society.
	www.digitalpreservation.gov /formats/fdd/fdd000001.shtml (371 words)

	DVD-Audio Tutorial - TimeForDVD.com
		Think of the analog audio signal as a continuously variable voltage that fluctuates in frequency and amplitude to represent the frequency of the sound and the loudness of the sound, respectively.
		To store the massive quantity of digital audio information efficiently, the DVD Forum has approved the use of Meridian's proprietary lossless (i.e., no digital information is lost in the encoding and decoding process) encoding/decoding algorithm as part of the DVD-Audio format.
		Nevertheless, the SACD format poses as a strong contender for the new high resolution audio format.
	timefordvd.com /tutorial/DVD-AudioTutorial.shtml (2820 words)

	Audio format comparison
		The MP3 audio format is the type I use the most.
		This format is a quite a new format (web link may be different).
		Another advantage is that this format uses variable bit encoding to handle complex stereo and audio parts of a track.
	www.geocities.com /seanbyrneprogrammer/Audio_Formats.html (3522 words)

	Java Audio Demos
		The audio file must be in.au format, recorded at 8 KHz, mono, in mu-law encoding.
		Audio enhancements include a new sound engine and support for audio in applications as well as applets.
		Java Sound can render 8 or 16 bit audio data, in mono or stereo, with sample rates from 8KHz to 48KHz, that might be found in streaming audio or any of the supported file formats.
	ptolemy.eecs.berkeley.edu /java/audio (585 words)

	Vorbis.com: FAQ
		Note that other formats are capable of being embedded in Ogg such as FLAC and Speex.
		Zip is a common general-purpose lossless compression format; FLAC is a lossless compression format that is specifically designed for audio.
		The Ogg container format was designed to allow different media types to be multiplexed together; Theora will be mixed with Vorbis audio in an Ogg container to encode movies.
	www.vorbis.com /faq (2565 words)

	WAVE_LPCM_BWF, Broadcast WAVE Audio File Format
		File format intended for the exchange of audio material between different broadcast environments and equipment based on different computer platforms.
		Based on the Microsoft WAVE audio file format, Broadcast Wave adds a "Broadcast Audio Extension" chunk to hold the minimum information considered necessary for broadcast applications.
		Recommended as the preferred format for the delivery of music recordings to record companies in the Draft Recommendation for Delivery of Recorded Music Projects developed by the Delivery Specifications Committee of the Producer's and Engineer's Wing of the Recording Academy (National Academy of the Recording Arts and Sciences).
	www.digitalpreservation.gov /formats/fdd/fdd000003.shtml (202 words)

	Introduction and basic knowledge of the various audio format - iAudiophile.net Forums
		WAV standard format files and CD-quality sound files is almost the same.
		WAV format is widely popular PC format audio files.
		The knowledge about audio formats is numerous and jumbled,and I’m here giving only some ABCs, and hopefully provide a thread to welcome more tech-savvy guys to add to the guide in order to help those still a bit confused.
	www.iaudiophile.net /forums/showthread.php?p=103903#post103903 (706 words)

	Audio File Format FAQ
		The Audio File Format FAQ is a collection of information related to Sound Formats used by computers that was started in November of 1991 by
		Wotsit Format - is a site dedicated to describing all file formats for PC's.
		Audio Effects Algorithms - by Toby Kurien - Has some effects algorithms like reverb and chorus.
	www.cnpbagwell.com /audio.html (344 words)

	MPEG AUDIO FRAME HEADER
		This is a brief and informal document targeted to those who want to deal with the MPEG format.
		This is one of many methods to compress audio in digital form trying to consume as little space as possible but keep audio quality as good as possible.
		This way you can compress audio up to 12 times (you may choose compression ratio) which is really significant.
	mpgedit.org /mpgedit/mpeg_format/mpeghdr.htm (1750 words)

	Working with BWF Audio in FCP
		BWF audio is still not mentioned in the FCP Studio manual (as of 2006), and that is something Apple should definetly change in future versions.
		As advertised, each audio take is displayed as the recordist named it during shooting by scene, shot and take numbers.
		There are numerous very good reasons for using external audio both for film and video, the main one being that the camera is often nowhere near where mics want to be, thus involving extra cables and gear hanging off the camera for people to stumble over and fumble with, which DP's generally despise.
	www.kenstone.net /fcp_homepage/basic_bwf_audio.html (2228 words)

	Audio File Formats
		It includes a brief description of the file format and the name of a program that first used the files or is commonly used to create, edit or play them.
		Typically, ASF files that contain audio content that is compressed with the Windows Media Audio (WMA) codec use the.wma extension.
		Audio content that is compressed with a wide variety of codecs and that is stored in a.wav file can be played back in Windows Media Player if the appropriate codecs are installed on the computer.
	www.csusm.edu /iits/trc/training/information/audioFormats.htm (804 words)

	Audioholics, Audio Product Reviews for the Masses (Site not responding. Last check: 2007-10-08)
		Hardware manufacturers are always looking for newer features to add to their product lines with hopes of boosted sales by sometimes creating the false consumer need for newer technologies even if they have little or no practical usage in the real world or if their implementation limitations hinders their true potential.
		While many audio publications have recently been writing glorious reviews on these new players that supposedly offer superior audio playback to CD, they often fail to tell you many of the shortcomings that currently make these technologies less than practical or ideal for that matter.
		Current popular DVD format which is very similar to DVD Audio but is data rate limited to 6.4 Mbps.
	www.audioholics.com /techtips/specsformats/dvd_sacd1a.php (580 words)

	Dvd Audio, DVD 24/96, HDAD
		DVD Audio is the latest member of the DVD family of pre-recorded optical disc formats and is designed to be the next-generation high-quality audio format, offering very high quality, surround sound, longer playing times plus additional features that are not available on CDs.
		Capacity of a single layer DVD Audio will be at least 74 minutes of high quality full surround sound audio.
		DVD Audio can be regarded as an extension to the DVD Video specification allowing high quality audio which can be played on audio-only players.
	store.acousticsounds.com /dvdaudio.cfm (868 words)

	Astrila - DVD-Audio Format - My Weblogs - Shital's Icle (Site not responding. Last check: 2007-10-08)
		This format is capable of delivering very high quality multi-channel surround sound on your home theater system.
		The DVD-A format is entirely different than usual Dolby Digital or DTS which is used for DVD movies.
		But DVD-A format which was developed later has learned lesson from this hack and currently there is no known way to decrypt.aob files which contains DVD-A audio tacks.
	www.shitalshah.com /blog/DVDAudioFormat.aspx (605 words)

	FLAC - Free Lossless Audio Codec
		Pearl Jam is selling recordings of many of their live shows in FLAC format.
		This is similar to how Zip works, except with FLAC you will get much better compression because it is designed specifically for audio, and you can play back compressed FLAC files in your favorite player (or your car or home stereo, see supported devices) just like you would an MP3 file.
		It means that the specification of the format is fully open to the public to be used for any purpose (the FLAC project reserves the right to set the FLAC specification and certify compliance), and that neither the FLAC format nor any of the implemented encoding/decoding methods are covered by any known patent.
	flac.sourceforge.net (579 words)

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