Search found 5 matches

by jaddie
Mon May 02, 2022 6:51 pm
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 48
Views: 107485

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

IIR, the QS chips may have been used to create the matrix, which was slightly different in the Dolby matrix vs stock QS. The second version of the Dolby Cat. 150 decoder card used the Tate/Exar chip set to hype adjacent channel separation, which would have been only 3dB without steering logic. These...
by jaddie
Mon May 02, 2022 1:04 am
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 48
Views: 107485

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Just found this thread. The wide-band phase shift network show up in several other interesting applications. In the original Dolby Stereo matrix 4:2:4 surround system, the goal was to produce an LtRt track where L+R (-3dB) is Center, L-R (-3dB) is surround, there is a problem panning from Center to ...
by jaddie
Wed Apr 27, 2022 11:52 am
Forum: Test, Measurement and Repair
Topic: Which Audio Analyser?
Replies: 27
Views: 99269

Re: Which Audio Analyser?

There's an REW version for Linux.
by jaddie
Wed Apr 27, 2022 11:51 am
Forum: Test, Measurement and Repair
Topic: Which Audio Analyser?
Replies: 27
Views: 99269

Re: Which Audio Analyser?

I have played with Linux, but not for audio testing. In general I find it to be too much trouble without a lot of benefit, so moved on. In my work I deal with Win machines, tons of them, Win10, 7 and XP (yeah, Xp...which is now eXtra Painful). One facility had some Linux machines, but users had so m...
by jaddie
Wed Apr 27, 2022 3:50 am
Forum: Test, Measurement and Repair
Topic: Which Audio Analyser?
Replies: 27
Views: 99269

Re: Which Audio Analyser?

I use both the Quantassylum QA401 with the QA software, and REW. For the interface, I have a Tascam US2X2HR and a Motu 4Pre, but I also use the 3rd party driver for the QA401, and use it with REW. Both the QA software and REW have their points. For scripted, automated testing, QA wins because REW ca...