In week 9 we were asked to go into the studios to induce distortion on some signal. We used a 100 Hz sine wave and used various techniques of distortion including, input distortion, output distortion, software distortion and daisy chaining. In this blog post I will be analysing the components of that distortion using a Spectrum Analyser.
I will start off with the unaffected 100 Hz sine wave:
As you can see there is obviously just a peak at 100 Hz with no harmonic content.
We started by cranking the desks input gain which had this affect on the 100Hz wave:
As you can see the odd multiples are louder than the even multiples, decreasing in amplitude as frequency increases, varying in amplitude.
We then routed the signal through a 1176 Compressor outboard hardware unit, cranking the input and output gain up, this was the affect that this had on the 100 Hz sine wave:
As you can see adding this distortion gave the wave harmonic content. As you can see the harmonics are evenly spaced at multiples of 100 Hz but they decrease in amplitude they multiply in frequency.
We then daisy chained our outboard hardware units, a 1176 Compressor, TLA Compressor and a TRS-12 Multi FX unit.
As you can see I boosted the gain of the EQ just so we could get a more clear view of the harmonic content. Once again we have the harmonic content increasing by multiples of 100 Hz. But the level of amplitude varies as every odd harmonic is louder than the even harmonics. The amplitude decreasing as the frequency increases once again.
Next we just simply inserted the BF76 Compressor plugin on Pro Tools to induce distortion:
Once again we have harmonics predominantly on the odd multiples decreasing in amplitude, although just above 2 kHz theres a small bell curve.
In this part of the unit we have explored the elements of distortion and how we can use it to our advantage or recognise the negative affect of it.
In this Module I believe I have addressed LO’s: 2, 16 and 21.