ATRAC3 - Revision history

Maxpol: Link to the original ATRAC codec page.

2018-11-29T13:57:52Z

Link to the original ATRAC codec page.

← Older revision		Revision as of 06:57, 29 November 2018
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	* Company: [[Sony]]		* Company: [[Sony]]
	* Samples: http://samples.mplayerhq.hu/A-codecs/ATRAC3/		* Samples: http://samples.mplayerhq.hu/A-codecs/ATRAC3/


	= ATRAC3 Introduction =		= ATRAC3 Introduction =

	ATRAC3 is the next generation of the ATRAC codec. There are three major implementations for the PC:		ATRAC3 is the next generation of the [[ATRAC]] codec. There are three major implementations for the PC:
	[[RealAudio atrc]], the Sony ATRAC3 for [[Microsoft Audio Compression Manager API\|Audio Compression Manager]] (ACM) and the Sonic Stage implementation.		[[RealAudio atrc]], the Sony ATRAC3 for [[Microsoft Audio Compression Manager API\|Audio Compression Manager]] (ACM) and the Sonic Stage implementation.

2018-11-29T13:43:26Z

Move format tag and samples to the right place.

← Older revision		Revision as of 06:43, 29 November 2018
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			* Format tag: 0x270
			* Company: [[Sony]]
			* Samples: http://samples.mplayerhq.hu/A-codecs/ATRAC3/

	= ATRAC3 Introduction =		= ATRAC3 Introduction =

2018-11-29T13:29:41Z

Repair RealAudio atrc link.

← Older revision		Revision as of 06:29, 29 November 2018
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	ATRAC3 is the next generation of the ATRAC codec. There are three major implementations for the PC:		ATRAC3 is the next generation of the ATRAC codec. There are three major implementations for the PC:
	~~RealAudio8~~ atrc, the Sony ATRAC3 for [[Microsoft Audio Compression Manager API\|Audio Compression Manager]] (ACM) and the Sonic Stage implementation.		[[RealAudio atrc]], the Sony ATRAC3 for [[Microsoft Audio Compression Manager API\|Audio Compression Manager]] (ACM) and the Sonic Stage implementation.

	ATRAC3 supports several different constant bitrates ("flavors"). The following table shows the		ATRAC3 supports several different constant bitrates ("flavors"). The following table shows the

2018-11-29T13:26:35Z

Move out RealMedia atrc related stuff to its own page.

@@ Line 1: / Line 1: @@
 = ATRAC3 Introduction =
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 Then follows the codes for each spectral coefficient in this subband. The VLC codes are shown below.
 == Transforms ==

2018-11-29T13:20:19Z

Maxpol moved page RealAudio atrc to ATRAC3: Rename to reflect codec's original name instead of its clone.

← Older revision	Revision as of 06:20, 29 November 2018
(No difference)

2018-11-29T13:15:31Z

Factor out general ATRAC description.

← Older revision		Revision as of 06:15, 29 November 2018
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	= ATRAC3 Introduction =		= ATRAC3 Introduction =

	~~ATRAC (Adaptive TRansform Acoustic Coding) is the collective name for audio compression technologies~~
	~~developed by [[Sony]]. This codec family includes the following codecs today: ATRAC, ATRAC3,~~
	~~ATRAC3plus and ATRAC Advanced lossless.~~
	~~You can read about it at http://www.sony.net/Products/ATRAC3/overview/index.html#family~~

	~~The ATRAC codec was introduced in 1992 with the MiniDisc. There is a good description at~~
	~~http://www.minidisc.org/aes_atrac.html. It is used in MiniDisc portable players~~
	~~by many companies.~~

	ATRAC3 is the next generation of the ATRAC codec. There are three major implementations for the PC:		ATRAC3 is the next generation of the ATRAC codec. There are three major implementations for the PC:

2007-04-25T10:46:47Z

grammar

← Older revision		Revision as of 03:46, 25 April 2007
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	* Encode the bitstream.		* Encode the bitstream.

	Even though this is for ATRAC2 (http://www.minidisc.org/atrac2.html) most of it ~~apply~~ to ATRAC3.		Even though this is for ATRAC2 (http://www.minidisc.org/atrac2.html) most of it applies to ATRAC3.

	== Decoding algorithm ==		== Decoding algorithm ==

2007-04-24T17:48:08Z

Encoding algorithm: slight rewording

← Older revision		Revision as of 10:48, 24 April 2007
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	* Split the input signal into 4 bands using a Quadrature mirror filter (QMF).		* Split the input signal into 4 bands using a Quadrature mirror filter (QMF).
	* ~~Gain~~ control ~~analyze and~~ obtain gain control data.		* Perform gain control analysis to obtain gain control data.
	* Convert all four bands into frequency domain using Modified Cosine Transform (MDCT or MLT).		* Convert all four bands into frequency domain using Modified Cosine Transform (MDCT or MLT).
	* Find tonal components.		* Find tonal components.
	* ~~quantization~~		* Quantization
	* Encode the bitstream.		* Encode the bitstream.

2007-04-24T17:30:13Z

Encoding algorithm

← Older revision		Revision as of 10:30, 24 April 2007
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	* quantization		* quantization
	* Encode the bitstream.		* Encode the bitstream.

			Even though this is for ATRAC2 (http://www.minidisc.org/atrac2.html) most of it apply to ATRAC3.

	== Decoding algorithm ==		== Decoding algorithm ==

2007-04-18T05:23:11Z

Not missing or undiscovered any more.

← Older revision		Revision as of 22:23, 17 April 2007
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	};		};

	~~[[Category:Undiscovered Audio Codecs]]~~
	[[Category:Audio Codecs]]		[[Category:Audio Codecs]]
	[[Category: QMF Audio Codecs]]		[[Category: QMF Audio Codecs]]
	[[Category: MDCT Audio Codecs]]		[[Category: MDCT Audio Codecs]]
	~~[[Category:Formats missing in FFmpeg]]~~