It’s a “near lossless” lossy method proposed by David Robinson, the developer of Replay Gain. It dynamically reduces the bitdepth of the audio on a 512 sample block-by-block basis having first determined what the noise floor of the signal is. Reducing bitdepth adds white noise to the signal. Adding white noise at / below the noise floor should not be perceptible.
I have implemented this method in Delphi / IA-32 / x87 and released it as lossyWAV. It is compatible with a number of lossless codecs which make use of the wasted-bits feature (lsbs consistently set to zero), thus increasing the efficiency of the encoding and reducing the resultant bitrate.
Current release v1.1.0b; current stable development version beta v1.1.3i.
Message Edited by NickC on 04-17-2009 03:37 PM
