Equalization, or simply EQ, in sound recording and reproduction is the process of adjusting the volume of different frequency bands within an audio signal. The circuit or equipment used to achieve this is called an equalizer.
A stereo graphic equalizer. For the left and right bands of the sound content, there are a series of vertical faders, which can be used to boost or cut specific frequency ranges. This equalizer is set to a smiley face curve, in which the mid-range sound frequencies are cut.
Equalizers are also made in compact pedal-style effect units for use by electric guitarists. This pedal is a parametric equalizer.
UREI graphic and parametric EQs; the device on top is a Power conditioner.
The equalizer-section from the Audient ASP8024 Mixing console. The upper section has high and low shelving EQ, the lower section has fully parametric EQ.
Sound recording and reproduction
Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording.
Frances Densmore and Blackfoot chief Mountain Chief working on a recording project of the Bureau of American Ethnology (1916).
Emile Berliner with disc record gramophone
Singer Tatjana Angelini recording the Swedish voice of Snow White in Snow White and the Seven Dwarfs, 1938
Magnetic audio tapes: acetate base (left) and polyester base (right)
