Distortion

From DNBWiki

Contents 1 Distortion 1.1 Usage of distortions 1.2 Types of distortions 1.3 Noise colors 1.4 Distorted links 2 Statistics and distortion

[edit] Distortion

[edit] Usage of distortions

[edit] Types of distortions

• Amplitude distortion
• Clipping
• Crossover distortion
• Frequency distortion
• Fuzz
• Overdrive
• Phase distortion
• Quantization Distortion
• Saturation
• Solid state distortion
• Stomp box
• Tube distortion

[edit] Noise colors

• Pink noise
• Red noise
• White noise

[edit] Distorted links

• Distortion on the other wiki

• Article on pink noise

[edit] Statistics and distortion

[A little to get this part going, someone please add something more :D]

White noise is generated by adding a random number at approximately equal interval, evenly over the whole spectrum. That is, there is equal amount of distortion (amplitude) over the same interval enywhere on the spectrum, e.g. there is equal distortion over a 10 Hz interval either from 90-100Hz and 19,99kHz and 20kHz, or simply: no fall in density of distortion. White noise spectrum

Sub-noises of white noise are:

• Pink noise, does not have and equal distribution as white noise, but has an equal distribution of noise over two proportional areas. E.g. it has an equal distortion over these two intervals: 20-40Hz and 2000Hz-4000Hz. Characterized by a fall in the density of the distortion by -3dB/octave.Pink noise spectrum
• Brown noise (or just red-noise), is characterised by its -6dB/octave drop in amplitude.Brown noise spectrum
• Blue noise has a litle different in that aspect that it has an 3dB/octave rise, or the amplitude of the noise gets bigger in higher frequencies.Blue noise spectrum
• Purple noise, as the blue noise has a 6dB/octave rise.Purple noise spectrum
• Gray noise, has come to compensate for white noise, allthough withe noise is supposed to have an equal distribution, we dont percieve it as equal at all, there is one problem with 'equal' when dealing with audio, that is that we need an increase of 1dB (approximately) to recognize and increase in audio volume by '1'. So if we would map that '1' by '1' inrease in audio volume over power, the power line on the map would look like its taking off compared with the '1' by '1' rise. So what gray noise does is that it compensates for frequency/amplitude characteristics so that 'seems' to be an equal distortion over all the frequency range. Eventually giving it a 'U' shape on a dB/octave chart. Gray noise spectrum