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Comments
The stairways images look cool - the horizontal lines are the overtones of the saw - and the filter sweep makes them visible one after the other and then after the peak was reached, removes them again starting with the higher frequencies.
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The upper graph seems to apply resonance, the white bright line going up and down at the „overtone visibility border“ ie the low pass filters cutoff frequency.
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The lower graph is clearly without resonance, but for the brightness change in the center i have to guess, but perhaps its two saws with a tiny freq difference that cancels out each other a bit ?
Yes, the second image is without rez, but that one is not a saw. It is a “square” with pulse width modulation.
That one also causes artifacts on my phone screen when quickly scrolling up and down.
Ah, i had overlooked that the second image had pwm in its description, but that explains the amplitude (brighness) changes .
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BUT if one puts the images side by side, i would have imagined that they differ in the harmonic frequencies as a square contains only the odd harmonics, while a saw consist of both odd and even overtones.
The imags shows the same harmonics - perhaps the filter sweep with resonance also was done with a square wave ?
I don‘t have Flynth, but that moiree pattern looks interesting. PWM you said ?
There are so many frequencies but no prominent harmonics, so it could sound more like noise with frequency omissions like from a phaser with modulated mix knob (fast pulsing in and out) ?
Hmm, as the graph states the msecs, one could count the amplitude changes (approx 40 in 1000msec) and deduct the pulsing freq as about 40hz, which is quite fast
No. That was actually a saw wave.
Intereting topics but these pictures are all a bit abstract without the corresponding sounds to listen to.
I was thinking of posting these as videos at first, but I think YouTube only goes up to around 16kHz.
Maybe a link to a wav on DropBox or somewhere else?
I probably won‘t hear that high freqs with my age, so posting a videos with only 16Khz range wouldn‘t matter at all
And the spectogram is taken from the synth/sweep and not from the resulting yt video, so posting a video would only add compression artifacts to the audio, but the graph stays the same.
I have never built a phaser or flanger plugin. However, what I understand is that the flanger is an LFO modulated delay mixed in parallel with the dry signal. One single delay creates a peak at every frequency whose wavelength is an integer multiple of the delay time. That is why you see many lines on the spectrogram when using a flanger.
The phaser, if I understand correctly, mixes the output of an LFO-modulated allpass filter together with the dry signal. This creates either a single peak or a single low-spot in the spectrum depending on whether the allpass filter output is added or subtracted from the dry signal. If you want more than one peak then you need to add more filter stages. That is what I understand from reading about it. I have not actually built a phaser myself.
Attached
Youtube can go higher than 16Khz for test signals like sine sweeps. It depends on whether the compression algorithm thinks you’ll be able to hear it or not.
You can feed Tube AU output into the spectrogram to see how high youtube goes. There are some sine sweep videos on youtube that go all the way up to 20 khz
I have tried a few:
No luck.
Do you have link?
Also, how do I avoid thIs frequency ceiling in my own uploads?
Unlisted video with the Zeeon Noise & Phaser:
Sounds boring, isn’t it ;-)
With headphones i can‘t really hear the phasing at the start of the video with the dark frequency omissions - its more obvious with iPads speaker. With added positive feedback the sweeps are very audible. BTW turning the feedback button to the left side, adds negative feedback - canceling a bit different frequencies.
Not to me, with lower feedback sounds almost like vocal whispers.
On laptop speakers the phasing is quite strong, even at the start.
Sounds cool.
Ambient noise of a star ship’s engine room.
@Jocphone Then please try with headphones - i just want to know if its only me who doesn‘t do „in brain phase cancelation“
I only mean the part at the start and end, when then split spectograms looks like noise, but the combined one shows the cancelation...
Yeah, interesting it's a lot more subtle through headphones. Probably acts more like mono with the laptop speakers.
And here the Zeeon Digi Drops presets video that produced the nice city scape.
First three triangle lfo phases with FX, then 3 lfo phases without. Without FX, one can clearly hear the clicks/noise spikes that produce bright vertical spike lines - these are washed away by the delay and phaser if enabled.
Hm... I don’t know. I have seen spectrograms of YouTube videos clearly showing audio sometimes going above 16kHz and I was pretty sure that the sine sweep videos go up to 20Khz without a problem. But your pictures clearly stop The sweep below 20K. I’m not sure why.
Toneboosters ReelBus
“Master tape - 30 IPS” preset in standard mode:
Anything you put through this WILL sound better.
“Master tape - 30 IPS” preset in HQ mode +30db !!!
With the input slamming at +30db it still sounds great!!!
Good to see the vastly improved spectrograms for ReelBus :-) :-) :-)
It is sorcery I tell you!
It really does sound amazing.
🙏
Yeah, the antialiasing does look good. The UI design looks cool too.
This thread is so awesome, I’m learning a lot of great info reading through it
Interesting. I usually upload to youtube via final cut pro. I have never actually checked the audio format it exports to see if it’s compressed or not. I guess most of my videos are just me talking so it hardly matters but I would still like to know if there’s a way to get better sound.
Maybe limited to lower quality for those who aren’t paying for YouTube?
When I look at spectrograms from speech compressed using that aac/m4a audio codec Most of the time there’s nothing above 15Khz But then every once in a while it encodes the full spectrum for a certain sound. It seems to switch based on content. I’ll try to post a picture.