mp3TrueEdit is a software application for Mac OS X and Windows that allows users to edit 'lossy' compressed MP3 and AAC audio files without decompressing and re-compressing the audio information and hence maintains the original sound quality.
MPEG-4 SLS allows for having both a lossy layer and a lossless correction layer similar to Wavpack Hybrid, OptimFROG DualStream and DTS-HD Master Audio, allowing for backwards compatibility to MPEG AAC-compliant bitstreams.
MUSHRA stands for MUltiple Stimuli with Hidden Reference and Anchor and is a methodology for subjective evaluation of audio quality, to evaluate the perceived quality of the output from lossy audio compression algorithms.
PEAQ (Perceptual Evaluation of Audio Quality) for audio quality of e.g. lossy audio codecs,
Avoiding pre-echo is a substantial design difficulty in transform domain lossy audio codecs such as MP3, MPEG-4 AAC, and Vorbis.
PS3 was capable of converting multi-channel DSD to lossy 1.5 Mbit/s DTS for playback over S/PDIF using the 2.00 system software.
It is a lossy speech compression codec designed specifically towards communication channels suffering from packet loss.
Some media are not reciprocal (e.g. very lossy or noisy media), but many very useful ones are approximately so, including sound waves in water or air, ultrasonic waves in human bodies, and electromagnetic waves in free space.