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| Author: | hvz [ Thu May 28, 2009 10:27 pm ] |
| Post subject: | Re: Preview... |
Ow... In that case, do you have another name? About the lows: Yup, that makes sense. What I did was, I changed some things in the processing which sometimes caused loud bass sounds to become too loud, causing distortion. I have removed that part, and now too loud lows which would cause distortion should be more or less gone. You can use the "Extra lows" slider in the Loudness panel to allow a bit of extra lows, they should not start to distort very quickly. I agree with you on the "I don't know" part... That's why I posted it here... Alternatively, I could make it configurable (but then I would still need to make a choice for my presets). |
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| Author: | Bojcha [ Thu May 28, 2009 11:13 pm ] |
| Post subject: | Re: Preview... |
new preset name FM_Transmitter_radium_75us_usa_stereo.sts i just notice one thing.. maybe it's not so importent but here it is.  That's filter, right? Can that be fixed? I compared with other processors .. they don't have that. i am not worry for audio .. but maybe for RDS .. i keep filter at 16kHz . and maybe it can interfere with rds. |
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| Author: | hvz [ Thu May 28, 2009 11:32 pm ] |
| Post subject: | Re: Preview... |
Quote: new preset name
It shouldn't interfere with anything - even if something is there it's still far below the noise level of a normal FM receiver (every horizontal line is a 10 dB step, so at the bottom of the display the signal level is -90 dB, which approaches CD quality! The extra sound doesn't get above -80 dB. And even then, it stays outside of the RDS signal range.)FM_Transmitter_radium_75us_usa_stereo.sts i just notice one thing.. maybe it's not so importent but here it is. That's filter, right? Can that be fixed? I compared with other processors .. they don't have that. i am not worry for audio .. but maybe for RDS .. i keep filter at 16kHz . and maybe it can interfere with rds. But if you want it to be gone: Put "FM Volume Overdrive" at just above 101%. Explanation: If I filter at 15 (or 16) kHz, that causes some small peaks in the signal. Those peaks would have to be removed, at a high sampling rate, which costs a lot of extra CPU power. Because of that I'm instead doing the final filtering step at a slightly higher frequency. That almost completely gets rid of the extra peaks. For FM Volume Overdrive, I had to do this extra filtering anyway, so there I'm not filtering at a higher frequency. If you put the overdrive volume too high, you'll get other pollution instead. Anyway, since the noise stays below -80 dB, this cannot be an issue for RDS or stereo reception. (Worse even, in Stereo Tool 3.40 the noise level was at about -40 dB - and RDS worked fine there.) The difference between the RDS signal level (at -35 dB in your graph) and the extra sound level (I've seen it go to about -80 dB) is still 45 dB, which means that the RDS signal is (in absolute levels) about 150 times stronger than the polluting signal. |
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| Author: | avita [ Fri May 29, 2009 12:16 am ] |
| Post subject: | Re: Preview... |
Great job Hans !!!, After few tests with RDS and pre-emphasis, i found that when i turn pre-emphasis ON, final limiter begin limit with red zone. It normal o not ? 
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| Author: | hvz [ Fri May 29, 2009 12:47 am ] |
| Post subject: | Re: Preview... |
Quote: Great job Hans !!!,
That's normal. Pre-emphasis greatly increases the amount of high frequency content, which causes the total volume to go up. This affects the multiband compressor and everything that comes after that, including the final limiter. So you should probably lower the final limiter volume a bit (that is, if it's distorting).
After few tests with RDS and pre-emphasis, i found that when i turn pre-emphasis ON, final limiter begin limit with red zone. It normal o not ? |
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| Author: | abdulok [ Fri May 29, 2009 11:31 am ] |
| Post subject: | Re: Preview... |
Quote: I have made a small change to the Loudness processing, but I'm not really sure if it's really better... Feedback is welcome!
Hi Hans,PREVIOUS version: Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... r_BETA.exe Stand alone version: http://www.stereotool.com/download/ster ... r_BETA.exe Command line: http://www.stereotool.com/download/ster ... d_BETA.exe VST version: http://www.stereotool.com/download/vst_ ... l_BETA.dll NEW version: Winamp DSP plugin: http://www.stereotool.com/download/dsp_ ... _BETA2.exe Stand alone version: http://www.stereotool.com/download/ster ... _BETA2.exe Command line: http://www.stereotool.com/download/ster ... _BETA2.exe VST version: http://www.stereotool.com/download/vst_ ... _BETA2.dll Expected change: Loud bass sounds should cause less distortion in the new version. The "trace of highs" problem when using Loudness instead of Final Limiter should be gone. (I do notice however that some mid-high frequency content is lost in this case, in both versions. I'll look into that later.) When running it, you can recognize the new version by the fact that there is a shade next to the Pre and Post amp sliders. Bojcha: I haven't yet had time to check out your preset, I will probably do so tomorrow. I have been checking the latest beta version this morning, I found the sound being improved now. It is more natural and well balanced, the annoying high frequency is reduced when using loudness. All the new features work great with a kind a professional look as usual. Well done Abdul |
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| Author: | Bojcha [ Fri May 29, 2009 6:10 pm ] |
| Post subject: | Re: Preview... |
Quote:
But if you want it to be gone: Put "FM Volume Overdrive" at just above 101%.
ok Hans .. it works.. but till i set intel pc.... i can't make it work with overdrive ON .. at my AMD Dual core .. Explanation: If I filter at 15 (or 16) kHz, that causes some small peaks in the signal. Those peaks would have to be removed, at a high sampling rate, which costs a lot of extra CPU power. Because of that I'm instead doing the final filtering step at a slightly higher frequency. That almost completely gets rid of the extra peaks. suddenly this AMD dualcore cpu start working on both cores at ~50% but again if i turn on overdrive dorps starting even the both cores are at ~55%. i don't get it. edit: Curently i am in bass testing... so now i found that low pass filter disturbs bass... sinusoide starts to looks very strange and kind vibrating .. when i set lowpass to 0 .. everything is normal ... |
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| Author: | Bojcha [ Sat May 30, 2009 12:11 am ] |
| Post subject: | Re: Preview... |
hmm.. found bigger problem... i can call it .. not always High Quality. First i play ... let's say .. 5000Hz tone thru ST (standalone). I turn off all limiters, multiband, loudnes, .. just pilot enabled (stereo pre-emphasize 50us) and what i get is this  now what is shuld do .. Klick this order (it's already on high quality with low latancy turned off) low latancy ON > low quality > mid quality > High Quality > low latancy OFF .... and now i get this  if i shut down ST .. again i must do klick order.. |
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| Author: | hvz [ Sat May 30, 2009 4:17 am ] |
| Post subject: | Re: Preview... |
Bojcha: Something seems to be wrong in the downsampler. If I set the input sample rate to 44.1 kHz, the input wave and volume look identical to the output, if I set it to 176400 or 192000, the output is different. And with Low Latency enabled I can even hear clicking sounds. |
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| Author: | hvz [ Sat May 30, 2009 4:53 am ] |
| Post subject: | Re: Preview... |
I have just uploaded a new BETA2. I think I've managed to increase the Loudness bass level a bit without causing more distortion. The mid-high frequencies are slightly (up to 0.1 dB) softer than in the previous BETA2, the lows are about 0.2 dB louder. The sound is now a bit closer to the original without using Loudness, so the slightly softer highs should not be a problem. The total output volume should be slightly higher (about 0.1 dB, so you probably won't notice any difference) |
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