Beats

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is called "beating" or producing beats. The beat frequency is equal to the absolute value of the difference in frequency of the two waves.
Arising from simple interference, the applications of beats are extremely far ranging.

Show

Wave envelope for two tonesApplications of beats
Index

Traveling wave concepts
 
HyperPhysics***** Sound R Nave
Go Back





Applications of Beats

Subjective tones
Missing fundamental effect
Police RADAR
Doppler pulse detection
Radio applications
Mulitphonics

Index

Traveling wave concepts

Doppler concepts
 
HyperPhysics***** Sound R Nave
Go Back















Envelope of Beat Production

Beats are caused by the interference of two waves at the same point in space. This plot of the variation of resultant amplitude with time shows the periodic increase and decrease for two sine waves.

Sum and difference frequencies
Index

Traveling wave concepts

Doppler concepts
 
HyperPhysics***** Sound R Nave
Go Back