Beat Frequency if two vibration components are quite close together in frequency and if they are present at the same time at the same place, they will combine in such a way that their sum will vary in level up and down at a rate equal to the difference in frequency between the two components. This phenomenon is known as beating, and its frequency is the beat frequency.
unit of level of a quantity proportional to power when the base of the logarithm is ten. Also, the unit of level of a field quantity when the base of the logarithm is the square root of ten
● Note : examples of power-like quantities are sound power and sound energy. Examples of field quantities are sound pressure and voltage.
Bel a bel is equal to 10 decibels (dB) and because it is a ratio of two quantities it is dimensionless.
The decibel (dB) is used extensively to 'describe' acoustic levels.
Binaural Recording sound recorded using two microphones spaced to simulate the listeners ears and usually transmitted separately to each ear of the listener. The results, using good quality headphones, can be very realistic.
Bow-tie Correction multispectral measurements for correlation functions are performed using spectrum averaging. Half of the normal time record is set to zero. Accordingly, correlation functions for continuous signals will decrease with the delay. The bow-tie correction compensates for this.
Broadband Noise also called wideband noise - noise whose energy is distributed over a wide section of the audible range as opposed to narrowband noise.