TAK介紹
ＴＡＫ is a lossless audio compressor, similar to FLAC, WavPack and Monkey's Audio. On average, lossless compression reduces the file size to about 50 percent of the original size; however the compression can vary between approximately 30 and 70 percent, depending on the file. Decompression restores a bit identical copy of the original audio data (that's why we call it lossless).My goal was to develop a compressor which combines good compression with optimal decoding speeds. On average, the current implementation should match the compression efficiency of Monkey's Audio High, while achieving decompression speeds similar to FLAC.
Features
- Good compression. The strongest mode (Extra) is on par with Monkey's Audio High and OptimFROG Normal. TAK's fastest mode (Turbo) easily outperforms FLAC's strongest mode. This classification is based upon the evaluation of hundreds of files of different genres; it may not be the case for every file that you compress.
- Fast compression speed. Currently I know of no other compressor which compresses faster than TAK's Turbo and Fast modes, while providing similar compression ratios.
- Very fast decompression speed. The decoding speeds achieved are similar to, and often surpassing, those achieved by FLAC.
- Support for any common audio format (not fully implemented).
- Streaming support. An info frame, which contains all the information required to decompress a file, is inserted into the compressed audio data every 2 seconds.
- Error tolerance. A single bit error will never affect more than 250 ms of the audio data, as the compressed data is being stored in independent frames no more than that duration. The decoder is able to decompress even badly damaged files, by removing corrupt frames or replacing them with silence.
- Error detection. Each single frame is protected by a 24-bit checksum (CRC).
- Fast and sample accurate seeking. The file header contains a seektable with seekpoints (at 1 second intervals). In the absence of the seektable seeking can still be achieved by using the sync codes of the frame headers and the (optional) relative offset values contained in each info frame, which are pointing to the previous and next info frame.
- Meta Data. A flexible and extensible structure in which to embed non audio data.
簡單解釋
對上文的簡單解釋：TAK是一種新型的無損音頻壓縮格式，全稱是Tom's Audio Kompressor，產於德國。目前最新版本還停留在1.01（2007年06月02日）。它類似於FLAC和APE，總體來說，壓縮率類似APE而且解壓縮速度類似FLAC，算是綜合了兩者的優點。另外，用此格式的編碼器壓縮的音頻是VBR，即可變比特率的。
幾大特點：
-較為優秀的壓縮率。使用Extra參數的壓縮率類似APE的High參數，而使用TAK最快的壓縮參數Turbo得到的結果和FLAC壓縮率最大的參數效果有得一比。
-較快的壓縮速度。作者說在相同壓縮率的情況下，據他了解尚未有別的格式能夠比TAK的Turbo和Fast的參數壓縮得更快。
-非常快的解壓速度。類似於FLAC的解壓速度。
-支持很多常用音頻格式轉換為TAK。
-流支持。每隔兩秒，包含解碼所需全部信息的一楨會被插入到音頻中。
-容錯度。1比特的信息出錯，最多影響到250毫秒的音頻。由於有上文提到的技術支持，利用本格式壓縮的損壞嚴重的音頻也可照樣播放，代價是損壞的部分由靜音代替。
-錯誤校驗。24比特的CRC校驗用於每一楨上。
-簡單快速的查找能力。即在你需要從中間某一點播放的時候，能夠很快地找到你想要的地方開始播放，定位也十分準確。
-支持音頻信息。同時支持利用外掛CUE分割音軌和添加音頻信息。類似APE等。
