atrac3p:start
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atrac3p:start [2009/11/14 18:09] – megadiscman | atrac3p:start [2010/03/20 11:36] – Add link to spectrum anatomy page megadiscman | ||
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===== ATRAC3+ format documentation ===== | ===== ATRAC3+ format documentation ===== | ||
- | ATRAC3+ is a hybrid subband codec like MP3. The signal is split into 16 bands, that are mostly encoded in the frequency domain. Some of the low frequency bands are split themself into smaller parts, customarily called // | + | ==== intro ===== |
+ | ATRAC3+ is a hybrid subband codec like MP3. The signal is split into 16 bands, that are mostly encoded in the frequency domain. Some of the low frequency bands are split themself into smaller parts, customarily called | ||
+ | ==== Parsing ==== | ||
+ | * First bit must be zero | ||
+ | * Array of blocks follows, each block: | ||
+ | * two bits type followed by data | ||
+ | * type 0 = single channel [[substream data]] | ||
+ | * type 1 = dual channel (stereo) [[substream data]] | ||
+ | * type 2 = non-audio data (ignored) | ||
+ | * type 3 = end of data marker | ||
+ | | ||
+ | ==== Synthesis ==== | ||
* [[bandlet joint stereo coefficient cloning]] | * [[bandlet joint stereo coefficient cloning]] | ||
* [[bandlet dequantization]] | * [[bandlet dequantization]] | ||
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* [[band envelope processing]] | * [[band envelope processing]] | ||
* [[band tone adding]] | * [[band tone adding]] | ||
- | * [[band time domain dithering]] | + | * [[time domain dithering]] |
* [[final band combination (IMDCT + FIR filtering)]] | * [[final band combination (IMDCT + FIR filtering)]] | ||
atrac3p/start.txt · Last modified: 2010/07/24 08:44 by megadiscman