I would hope to see similar results for the SQ test. Perhaps one the other readers will step forward. I know from other listings on this forum, that the phase of the output is also important in establishing a clean image. This was only one test and involved no listening on my part. CF is shown similar to its original description (see number 1 above).īravo. RS is shown at a reduced power level with some crosstalk to the channels of the left side.ĩ. CB is shown at the reduced power level with no crosstalk to the front channels.ħ. LS is shown at a reduced power level with some cross-talk to the channels of the right side.ĥ.
LF is completely isolated at full power.ģ. There is no crosstalk in the rear channels.Ģ.
707, that magic number, in each of the LF and RF channels. Some wonderful things are happening here.ġ. The channels shown from top to bottom are LF, RF, LB, and RB. I did not change any parameters, which you can adjust, but used the default settings. Viewing from left to right the test tone is decoded for CF, LF, LS, LB, CB, RB, RS, RF, and finally returning to CF. The test shows the signal processed through 8 points of the circle. The results are shown from the screen print using Audacity. The first test was of your version of QS Vario Matrix. I am assuming that these tones are accurate as is claimed on the website. First of all I have obtained the SQ and QS Test Tones from the website.Īnd after learning the basics of the Plogue Bidule platform, have processed the test tones through your decoder. Let me walk you through the results of a couple of tests I have completed with your decoder. Like you, I have been intrigued by the ideas of Lynn Olsen and have read through the original patent papers for this technology long ago.
I also have experience with the Adobe Audition scripts. I have listening experience with several of the components described on this forum including the Tate II and lately the Surround Master. I became interest in the surround sound technologies in the early 70s and have been following the development of these technologies since. Also, I have no experience in the recording industry. I have no scientific programming experience in DSP.
I am rather surprised about the small activity on this thread, so I've decided to answer your call for suggestions.įirst a little about myself, I am a retired former IT professional from business processing. This is my first time posting to any QQ thread since I joined the group a few years ago. Thank you so much for the wonderful work you have done on your multi matrix decoder.
Give it a try and let me know if it helps. The resulting file should then be pretty well balanced and phase aligned (at least in time, not phase angles of each channel - that's a different problem). Note these settings and use as a good starting point for your next SQ rip. Take a good mono record, play it while monitoring the rear channels and carefully adjust for no output from the rears. If you make your own rips of SQ material here's what I would suggest. Pay more attention to to the lower frequencies (eliminating a center bass or vocal from the rear) first then fine tune for higher (snare or cymbal). Obviously unless the file is REALLY messed up a very slight change would be necessary. Be aware that when adjusting the timing between the channels the measurements are in milliseconds and at 10,000 Hz a change of 0.1 mS will change it a full cycle and the adjustable range is + or - 0.4mS. Used carefully it is possible to improve the performance of any decoder, SM included. It also added the ability to synch and balance the 2 channels for a file which you didn't create that may have been improperly recorded or aligned in time. Before pre-processing the separation was terrible. Using it I have been able to achieve around 20dB separation using a noisy, popping, and poorly recorded short channel ID "Test Record" file circulating around the internet. The pre-processor of my layout is an attempt to add that function. Click to expand.The inventor of "Shadow Vector" SQ, Lynn Olson, said that he created a pre-processor to inject a controlled amount of positive or negative feedback to cancel crosstalk between channels and found it "necessary" to achieve good separation results even when using CBS's own SQ test records.