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Sound pressure p, SPL, L PA Particle velocity v, SVL Particle displacement δ Sound intensity I, SIL Sound power P, SWL, L WA Sound energy W Sound energy density w Sound exposure E, SEL Acoustic impedance Z Audio frequency AF Transmission loss TL
In acoustics, a beat is an interference pattern between two sounds of slightly different frequencies, perceived as a periodic variation in volume whose rate is the difference of the two frequencies. With tuning instruments that can produce sustained tones, beats can be readily recognized.
In this type the derivative (slope) of the wave's amplitude (in sound waves the pressure, in electromagnetic waves, the current) is forced to zero at the boundary. So there is an amplitude maximum (antinode) at the boundary, the first node occurs a quarter wavelength from the end, and the other nodes are at half wavelength intervals from there:
Noise reduction is the process of removing noise from a signal.Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree.
A Sound atom is a source of audio (like a microphone input or a noise generator), a unary transform modifies its argument (for example, a low-pass filter might take a running average of its input), and an n-ary transform combines two or more Sounds (a Mixer, for example, is defined as the sum of its inputs).
Impulse noise is a category of noise that includes unwanted, almost instantaneous (thus impulse-like) sharp sounds (like clicks and pops)—typically caused by electromagnetic interference, scratches on disks, gunfire, explosions, pickleball play, and synchronization issues in digital audio.