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| StereoTool For HD2 Broadcast https://forums.stereotool.com/viewtopic.php?f=6&t=7273 |
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| Author: | dahart [ Tue Jan 12, 2016 2:52 am ] |
| Post subject: | StereoTool For HD2 Broadcast |
Anybody have any luck using StereoTool as a standalone audio processor for a HD channel? Have a ST box on air with a FM channel and really like it. Trying to setup a HD channel now and I'm not getting the sound where I would like to be. I know that I am dealing with bit reduced audio and you sure can hear it in the high end. Any tips or tricks?? Certain settings I should stay away from like clippers or are you able to still use the advanced clipper to really get some loudness like in FM? Airchain is BT switcher analog output into a set of Moseley T1 coders. Coming out the AES output at 44.1kHz into a Nautel Importer Plus. |
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| Author: | Bojcha [ Tue Jan 12, 2016 5:42 pm ] |
| Post subject: | Re: StereoTool For HD2 Broadcast |
You tried "normal" output? Also you can always install another instance of ST standalone on same PC and use it just for non-FM processing. |
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| Author: | hvz [ Tue Jan 12, 2016 9:24 pm ] |
| Post subject: | Re: StereoTool For HD2 Broadcast |
@Bojcha: HD2 is usually already another signal. So I suppose the question is how to avoid encoding artifacts. Can you compare against other stations that use a similar bitrate? Just to make sure if it's not just caused by the bitrate that you're using without much options to fix it (except increasing the bitrate, but that would have to come from HD1 I suppose). There are a few things that could help, having more dynamics often helps. So avoid a lot of clipping and limiting. And, if you have clipped audio, always use the Declipper - beside the quality improvement from removing the distortion it also reduces the complexity of the signal for lossy codecs. And you might want to be careful with stereo widening, and especially with phase cancellation issues between left and right. Using Stereo Image, with Phase set to 0% (or at least below 100%) might help but it can also create artifacts, so that's something that you'll have to try out. |
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| Author: | Sandburner14 [ Fri Apr 29, 2016 9:48 pm ] |
| Post subject: | Re: StereoTool For HD2 Broadcast |
I know this is an older Post, and you may already have figured it out, but if not, here are some suggestions; Density is your enemy when coding low bitrate audio, the denser the audio is, the harder the codec has to work, the more open you can keep your audio the better it will sound at the other end of HD or low bitrate web streams. To help this in Stereo Tool, see below; Turn OFF MB2 Dial the Density down on MB1 Check drive level to MB1, make sure you're not driving it with more than -6db of average gain reduction on all bands Check ratios on all MB bands, the lower the better, I have found that 4:1 works well Don't drive the clipper very hard Note that when doing this, you may start to hear the Wideband AGC, if so, just slow it down |
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