Stereo Tool

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).

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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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.)

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.

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 ?

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).

Hi Hans,
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

ok Hans .. it works.. but till i set intel pc.... i can't make it work with overdrive ON .. at my AMD Dual core ..
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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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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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.

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)