Pro Logic History

[Lt1z323]

Hello all,

I'm hoping you can help provide some history on the older Pro Logic decoder. I'm well aware of the consumer active decoder that was available but I've read the first incarnation was actually a passive matrix. If true can anyone provide some info, possibly patent info. I'm guessing that it'd likely be similar to a Hafler matrix with a summed center but any info would help. I've been reading up on the patent for PL and the cited AES papers but can find nothing concrete on the passive version.

For that matter if anyone can provide any info on the history of Tate as a company I'd really appreciate it. Info online is very scarce.

 

[kfbkfb]

Dolby Surround was called Dolby Stereo in the early years, it was changed to being called Dolby Surround in the mid-1980s.

https://en.wikipedia.org/wiki/Dolby_Stereo

(seems like many of the links at the bottom of this wiki page could be useful in understanding Dolby MP/Stereo/Surround matrix encoding)


Kirk Bayne