Noise

Disciplines of Study [DoS]  >  Acoustics  ]

In contrast to most ’musical’ sounds, which have a definite pitch and a predominantly harmonic spectrum, noise consists of a theoretically infinite and continuous range of frequencies. The waveform consists not of regular periodic cycles but of random fluctuations of amplitude. In the present context, the bandwidth of the noise may be considered limited to that of human hearing. As will be seen, it is possible to speak of noise limited to a variety of bandwidths.

It is usual to use analogies to visible light when discussing different types of noise. Thus, noise, which has equal intensity at all frequencies, is referred to as ’white noise’. Because the human ear is more sensitive to high than to low frequencies, white noise will be heard as a high hissing sound.

By passing white noise through a filter, different ’colours’ can be obtained. ’Pink noise’ results if white noise is passed through a mildlow-pass filter. Whereas white noise has equal power at all frequencies, pink noise is defined as having equal power in each octave band (corresponding more closely to the response of the ear). Thus the power varies inversely with frequency - for this reason it is often referred to as ’1/f noise’. Similarly ’red noise’ is referred to as ’1/f (Squared) noise’, the high frequencies being much more attenuated than in pink noise. (Source - Richard Dobson (1992). A Dictionary of Electronic and Computer Music Technology. Oxford University Press.)

 

See also:

Noise Pollution, Subtractive Synthesis

 

Bibliography:

English - Español - Français - Deutch - Italiano

Alphabetical order - Chronological order

Top

purchase zocor in canada prostaglandin e1 cream price of azithromycin buy pletoz usa in mexico buy azithromycin budeprion xl 300 mg buy acamprosate calcium in france bupropion prices buy generic diflucan zhewitra lowest price canada lipitor cheap in united states nuvigil 150 mg bimatoprost for more info buy kamagra oral jelly canada piracetam amazon http://www.solidaritesjeunesses.org/?buy=378266 ciprofloxacin 1000mg norvasc 25mg otc zantac 150mg http://www.solidaritesjeunesses.org/?buy=131686 buy bimatoprost simvastatin tab 80mg in uk buy arpizol usa prednisolone for sale nitazoxanide 500 mg in new york cheap generic norvasc online generic atorvastatin azithromycin pilva sustanon 250 perscription ciprofloxacin 250mg tab bactrim ds 800 160 buy orlistat uk in mexico buy flagyl information nebraska accutane budeprion xl 150 mg http://www.solidaritesjeunesses.org/?buy=630208 bupropion 150mg sr tenofovir truvada fluconazole without prescription buy topirol usa order erlonat http://www.solidaritesjeunesses.org/?buy=365557 buy floricot usa norvasc online pharmacy in uk http://www.solidaritesjeunesses.org/?buy=870469 veenat for sale drug nuvigil http://www.solidaritesjeunesses.org/?buy=322438 vidalista for sale http://www.solidaritesjeunesses.org/?buy=381396 buy bimatoprost without prescription http://www.solidaritesjeunesses.org/?buy=829409 over the counter bupropion piracetam ohio in india buy naltrexone online more simvastatin buy ciprofloxacin 750 fluconazole over the counter orlistat online without prescription bupropion 415