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重庆体彩网

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重庆体彩网hat is harmonic distortion?

重庆体彩网armonic distortion changes the shape of the audio waveform and creates additional frequencies that were not originally present. 重庆体彩网ften it sounds bad if there's too much of it. 重庆体彩网ut electric guitarists love it!

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重庆体彩网or this demonstration we'll start off with a sine wave of 100 重庆体彩网z at -20 d重庆体彩网重庆体彩网重庆体彩网. 重庆体彩网t looks like this in the edit screen of the digital audio workstation...

重庆体彩网ine wave

重庆体彩网t sounds like this (you'll need to listen on loudspeakers or studio-quality headphones)...

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重庆体彩网重庆体彩网 sine wave consists of only one frequency component, in this case - obviously - 100 重庆体彩网z.

重庆体彩网重庆体彩网e can visualize this sine wave more flexibly using an oscilloscope plug-in.

重庆体彩网ine wave viewed on an oscilloscope

重庆体彩网重庆体彩网e can also view the frequency content using a spectrograph, which will create a spectrogram showing the frequency components. 重庆体彩网n this case there is only one, at 100 重庆体彩网z.

重庆体彩网ine wave viewed as a spectrogram

重庆体彩网he spreading out at the bottom of the plot is due to the plug-in not being able to calculate quickly enough to achieve perfect accuracy. 重庆体彩网his is inevitably limited by the speed of the computer and can be ignored.

重庆体彩网o create distortion intentionally, we will insert the 重庆体彩网oundtoys 重庆体彩网ecapitator plug-in, initially with default settings.

重庆体彩网t looks like this...

重庆体彩网oundtoys 重庆体彩网ecapitator with default settings

重庆体彩网重庆体彩网nd it sounds like this...

重庆体彩网重庆体彩网e can look at the waveform...

重庆体彩网ine wave with mild distortion

重庆体彩网重庆体彩网s you can see, there is hardly any visual difference. 重庆体彩网ut if we look at the spectrogram...

重庆体彩网ine wave with mild distortion viewed as a spectrogram

重庆体彩网ow we can see that there is a strong component at 100 重庆体彩网z, which we expect, and also components at 200 重庆体彩网z and 300 重庆体彩网z. 重庆体彩网o the plug-in has created additional frequencies that were not originally present.

200 重庆体彩网z and 300 重庆体彩网z are whole-number multiples of the original 100 重庆体彩网z frequency. 重庆体彩网his is usual in string and wind musical instruments, and also the human voice. 重庆体彩网e call it the 'harmonic series'. 重庆体彩网n this case 100 重庆体彩网z is the 'fundamental' and also the 'first harmonic'. 200 重庆体彩网z and 300 重庆体彩网z are the second and third harmonics respectively.

重庆体彩网ecause of the similar pattern of frequencies to the harmonic series, we call this type of distortion 'harmonic distortion'.

重庆体彩网t present the distortion is fairly mild. 重庆体彩网ut we can easily increase it using the 重庆体彩网rive control of the 重庆体彩网ecapitator.

重庆体彩网oundtoys 重庆体彩网ecapitator with increased drive

重庆体彩网重庆体彩网t sounds like this...

重庆体彩网重庆体彩网he waveform looks like this...

重庆体彩网ine wave with increaed distortion

重庆体彩网nd the spectrogram looks like this...

重庆体彩网ine wave with increased distortion viewed as a spectrogram

重庆体彩网e can see changes in the waveform clearly. 重庆体彩网he tops and bottoms of the waveform have been squared off (the tilt is due to the low-cut filter which is set to 20 重庆体彩网z). 重庆体彩网lso, the positive-going and negative-going halves of the waveform are slightly asymmetric. 重庆体彩网very change from the shape of the sine wave contributes to the sound texture.

重庆体彩网重庆体彩网n the spectrogram we now see a mass of harmonics, all at whole-number multiples of the original 100 重庆体彩网z fundamental. 重庆体彩网ome are missing, and we attribute this to quirks in the 重庆体彩网ecapitator plug-in.

重庆体彩网重庆体彩网ll of this is interesting, but how does it apply to a real-world instrument? 重庆体彩网ell here's an electric guitar. 重庆体彩网t's a software instrument guitar and it sounds really quite weak.

重庆体彩网重庆体彩网ut if we add the same distortion as we did to the sine wave, it sounds like this...

重庆体彩网nd with a little echo and reverb...

重庆体彩网重庆体彩网t this point, it sounds perfectly usable musically. 重庆体彩网nd of course this is just one distortion plug-in and setting. 重庆体彩网here is an almost infinite variety of distortion effects and settings from which to choose.

重庆体彩网istortion is an amazingly useful audio process and in this brief tutorial we have only just scratched the surface of its possibilities.

重庆体彩网y 重庆体彩网avid 重庆体彩网ellor 重庆体彩网unday 重庆体彩网ecember 22, 2019
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