atrac3p:start
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atrac3p:start [2009/11/14 18:09] – megadiscman | atrac3p:start [2010/07/23 16:35] – bandlet -> QU 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 | + | ==== intro ===== |
+ | ATRAC3+ is a hybrid subband codec like MP3. The signal is split into 16 bands, | ||
- | | + | ATRAC3+ can have more than 2 channels - in that case more than one substream is present. This case is not described here. |
- | * [[bandlet | + | |
+ | ==== 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 ==== | ||
+ | | ||
+ | * [[quantization unit dequantization]] | ||
* [[band frequency domain dithering]] | * [[band frequency domain dithering]] | ||
* [[band joint stereo post processing]] | * [[band joint stereo post processing]] | ||
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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