I just produced a new version of the decoder. It can do some amazing things, needed because lots of material (mostly before 1990s) has been distributed with DolbyA encoding still intact. That leaves a harsh, compressed HF, sheen, overly crisp voices -- kind of sound on the recording. My decoder, does a very credible job of a true correction, and is being used professionally as a DolbyA decoder. It was compared with a true DolbyA unit (actually several of them) and another software decoder. This software came out significantly closer to the results of a true DolbyA decode than the other SW.

The program is not a trivial little toy, but does lots of work to both clean up the audio and to clean up the intermodulation and other evils that occur oh so easily when doing nonlinear processing on audio. I have posted the program da-win-06may2018A.zip, a file containing some hints: DecoderA.pdf, and some EYE-OPENING example recordings. Repo location: https://spaces.high…

The decoder is free, has no timeouts or anything like that. It works only on recent Intel or AMD machines -- the da-win version will work on newer ATOMS like the Silvermont (and will work on the newest CPUS but doesn't take advantage of them.) the da-avx version takes better advantage of the more advanced vector operations. 95% of the CPU usage on this program is vector math -- fairly advanced code. It is MUCH more processing than a simple DolbyA emulator because it has to sound GOOD. Simple implementations will have so much intermod, people will say things like: there is that harsh computer processor sound again. This code is less distorting by far than even a real DolbyA.