> On May 3, 2020 2:28 PM Owen Smith <[email protected]> wrote: > > > That's it, it was originally broadcast in Matrix HJ. As you say, not clear if > the rebroadcast is matrix encoded but unless they've re-mastered it in some > way it probably is.
I've been admiring the diagrams and matrices in http://downloads.bbc.co.uk/rd/pubs/reports/1977-02.pdf It looks rather phase sensitive. I'd fear that the psychoacoustic compression on the iPlayer might harm that, but you never know until you try. You might be better off searching for other sources of recordings though. > > My friend develops his own matrix decoding solutions using multiple steps in > off the shelf audio processing software, like Audacity. This is not remotely > real time, it takes many hours to do one album. But if you're doing matrix > decoding you can keep the output and listen to it again. He and I have never > understood the general obsession with decoding matrix quad in real time. Do > it well and do it once. Do share your results, I am curious. If the process is similar to the one in the paper, it looks like the kind of thing modern CPUs can eat for breakfast, if done in something compilable. The block diagrams are reminiscent of audio codecs and software defined radio. I imagine you could do a better job of decoding it than was ever possible in 1977. The rather cruder Dolby Surround system has been through multiple revisions over the years. All the best, Dave _______________________________________________ get_iplayer mailing list [email protected] http://lists.infradead.org/mailman/listinfo/get_iplayer
