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I've been observing the sonographic display of various music compositions, and sometimes there was this one detail to be found that I couldn't explain nor understand: up-to-down symmetry. Like if there was a line, after which the pattern was getting mirrored up. What is it? A trick to enhance the high frequency component? A distortion of some sort? Context-close example: first seconds of Autechre's Gantz Graf, mirror line @ ~14800 Hz. I've also seen the effect showing much more - on a sample of my own production, which had its sampling frequency forcefully reduced by about eight times with no antialiasing filter involved (done by Logic's “bitcrusher”). There I saw multiple evenly mirrored copies of one block repeating vertically. Why, why, why? Then, there are some tracks in which the frequency range is truncated at frequency [x], with the very frequency [x] present rather brightly, resembling a cut border. Is there an explanation for this, too? I could make packs of screenshots, but I'm too lazy. I hope you people understand my babble clear enough :) |
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what is a sonographic display? |
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oh, right - i didn't know the correct term for that. i wish i knew how to answer your questions, but i'm not sure i understand them, and besides, i'm just not knowledgeable enough to get into such technical details. sorry. |
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This really doesn't have anything to do with mastering, you know. Just the way spectrograms look. One - that's simply what the spectrum of a signal looks like if the sample rate is "reduced" that way. If you want to know exactly why, go learn Fourier analysis. Two - you've made music and you've never come across a lowpass filter? They're called that because only low frequencies pass through unharmed, so to speak, "low" usually meaning "below a certain frequency". Filters used for music tend to also have a resoannce parameter of some sort, which basically means that you can additionally make the cutoff frequency louder. The magnitude response will typically be something like , hence the way a filtered signal looks in a spectrogram. (imagine that graph as representing the brightness of a vertical line in one) |
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I think I might be able to help, but I really need a picture with a big arrow pointing at what your absolutely talking about. I'm a visual person. |
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the user 'sanguine' seems to start random mastering tips topics here. he may be of some help. |
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It looks like you're seeing aliasing in action: you get the normal frequency, plus the second (an alias) higher up, as a result of sample-rate-reduction or poor oscillator rendering, hence the name. That's my guess anyway. |
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so mastering is like fine tuning mixing right? |
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? have a look in the sound on sound reviews or questions and answers! |
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Thank you a lot guys, you two were really helpful :) And of course, I'm familiar with lowpass filtering, I just didn't really know if resonance was a function of the filtering algorythm or a fancy effect added manually (that would be kind of silly). |
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