Variable-rate multimode wideband (VMR-WB).Harmonic vector excitation coding (HVXC). High-efficiency advanced audio coding (HE-AAC). Global system for mobile communications enhanced full rate (GSM-EFR or GSM 06.60).Global system for mobile communications full rate (GSM-FR or GSM 06.10).Global system for mobile communications half rate (GSM-HR or GSM 06.20).Dolby digital plus / enhanced AC-3 (E-AC3).Adaptive transform acoustic coding (ATRAC1).Extended adaptive multi-rate wideband (AMR-WB+).Adaptive multi-rate wideband (AMR-WB) / G.722.2.Those techniques also minimize the amount of audible noise added during the process. However, many technologies are applied to remove the parts of the sound that have the least effect on perceived quality. Thus, the quality of the audio is also reduced. It removes some of the audio information and simplifies the data. Lossy compressed audio formats make it possible to further reduction of audio file size. That is to say, for the same original audio data, encoded by those formats generating a file has half the size of that encoded with PCM format. The above lossless audio formats offer a compression ratio of around 2:1.
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