Beating

Disciplines of Study [DoS]  >  Acoustics  ]

Beats are a form of amplitude modulation. As two frequencies are brought closer together, the beats will gradually slow down and disappear when they become identical. If two tones are about 15 Hertz or less apart, interference will result from their similar though not exactly identical frequencies. Gradually they will move out of phase until at 180 destructive interference results, producing diminished loudness. When they move back into phase, constructive interference will produce increased loudness. Beats arising from the mistuned unison are called first-order beats, and are both an acoustic and psychoacoustic phenomenon. Beats also may be heard between pure tones that are nearly an octave, fifth or fourth apart. These are called secondary or second-order beats. (Source: Barry Truax - Handbook for Acoustic Ecology CD-ROM Edition. Cambridge Street Publishing, 1999 - CSR-CDR 9901)

 

See also:

Modulation

 

Bibliography:

English - Español - Français - Deutch - Italiano

Alphabetical order - Chronological order

Top

erlotinib drug in france http://www.actuabd.com/?order=361923 information about otc zantac 150mg tadaga 10 sildenafil citrate online pharmacy no prescription pharmacy online bupropion buy gleevec usa more info purchase piracetam quetiapine 1300 mg info about buy diflucan no prescription uk accutane buy waklert uk fertyl for sale more info doxycycline cost zocor overnight flagyl 4000 mg premarin generic lasix 50mg bupropion 150mg sr femara lowest price more info about buy normabrain usa sustanon deca enalapril no rx more info buy generic attentrol more info about norvasc 500 mg dilantin 400 mg acamprosate manufacturer generic simvastatin buy cheapest acamprol in mayami http://www.actuabd.com/?order=821836 order flagyl online http://www.actuabd.com/?order=953307 bimatoprost prices in uk mail order lipitor buy tadarise without a prescription in canada buy terbicip usa buy nuvigil mexico fluticasone propionate oral inhaler about lumigan 0.01 buy modvigil online suhagra from india more info nexium tab 20mg diflucan pills azithromycin 25 0mg t modafinil price generic erlonat caverta 100mg malegra dxt 130mg cheap bupropion from united states http://www.actuabd.com/?order=326514 flagyl online no prescription generic of nexium about buy baclof canada