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ST ideas and questions https://forums.stereotool.com/viewtopic.php?t=7718 |
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Author: | bobritain [ Mon May 02, 2016 1:16 pm ] |
Post subject: | ST ideas and questions |
I love ST - and the 7 Wonders preset in general (with a few tweaks - but isn't that the point!) A few questions: 1. SSB FM - from what I can hear this makes no real difference to the sound (and I remain a bit doubtful about the multipath benefits) but I understand that the idea is to avoid clipping harmonics cancelling each other (e.g. a tone at 9500 Hz would have a third harmonic at 28500 Hz, but that would also be the frequency caused in the stereo MPX e.g. 38000-9500). So why not use the upper side-band only instead of the LSB? There are no third harmonic relationships between the mono signal and the USB part of the SSB signal? 2. Where in the chain is the pre-emphasis applied? Could this be made adjustable (e.g. to put it between MB1 and MB2) so that MB2 could be used to capture the horrid HF transients caused by the pre-emphasis but MB1 could be left more free to play with the sound? 3. Could a pink noise generator be added to the input to see the resulting output spectrum, to help tune the MBs? 4. In the same way there are 'difference' buttons for some functions, would it be possible to have a button to listen to the output of the 'sidechain' on the SB compressors? 5. How does the de-esser in the clipper work? It wasn't clear from the description in the help section. Is it a sliding frequency de-esser that applies an LPF of and ever lower frequency until the peaks are sufficiently reduced; does it reduce the pre-emphasis; or does it act on all frequencies above a certain point equally? 6. The default settings for MB2 have incredibly short attack and release times - what is the intention of these? Is it for MB2 to act more like a clipper than a compressor, or does it perform some other function. From what I can hear it adds density but also quite a lot of distortion (if driven too hard). One other question/thought - having played around with multiband analogue processors since the 90s, one thing I found really useful was to split the cross-over band filtering before and after the compressor (usually 12/18 dB/oct before and a simple 6 dB/oct after, because in the analogue domain you can't get 15dB/oct ![]() Bob |
Author: | hvz [ Wed May 04, 2016 10:35 pm ] |
Post subject: | Re: ST ideas and questions |
Hi Bob! 1. As far as I understood (lol), the idea is that less high frequencies means less chance to have multipath issues. 2. Pre-emphasis is applied just before the clipper. Are you running into issues with too much highs? The clipper should normally be able to handle those. 3. That's on my todo list 4. Also on my todo list 5. It reduces pre-emphasis 6. Idea is to add some 'sparkle' to the sound - you really shouldn't drive it hard with these settings. It tends to give the sound a bit more "body". Final: I used to do that in my very first MB compressor design (including the clipping). You can get a bit of this by using 'Flat Frequency Response', which will add 2 lines in the bands view: One before and one after the compression is performed. |
Author: | bobritain [ Mon May 09, 2016 5:33 pm ] |
Post subject: | Re: ST ideas and questions |
Hi Hans and thank you for the quick and detailed reply. 1 .With regards to the SSB issue, in the 'help' section, you state: Quote: Something special happens when a tone of 12666.7 Hz is transmitted in the L-R signal. The upper sideband frequency (50666.7 Hz) is exactly a multiple of the lower sideband frequency (25333.3). In the RF spectrum, the energy of these two frequencies gets bundled and much higher peaks occur.
This is what I was meaning with the relationship between the clipper harmonics and the MPX. I wonder if there is an optimal mix of LSB and USB that overcome all of the problems of relationships between the harmonics between the baseband and the MPX (and between the MPX and MPX as you indicate above). As for USB reducing multipath, I'm not convinced but the Stokkemask certainly seems to help!2. No problems with the pre-emphasis, and I guess it makes no real difference where you put it, I just wondered where it was. 5. Thanks for the info on the de-esser. I guess it works like my old analogue system - which is good ![]() 6. Thanks for the info on the default settings. My 'acid test' for any settings is always to drive them hard so that you can really hear what they are doing (before winding them back of course). I realise you can't really drive MB2 hard with the default settings - it sounds horrid! I'll play around with it a bit more. Keep up the good work. Bob |
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