Equalization

Equalization (British: equalisation) is the process of adjusting the balance between frequency components within an electronic signal. The most well known use of equalization is in sound recording and reproduction but there are many other applications in electronics and telecommunications. The circuit or equipment used to achieve equalization is called an equalizer. These devices strengthen (boost) or weaken (cut) the energy of specific frequency bands.

In telecommunications, equalizers are used to render the frequency response—for instance of a telephone line—flat from end-to-end. When a channel has been "equalized" the frequency domain attributes of the signal at the input are faithfully reproduced at the output. Telephones, DSL lines and television cables use equalizers to prepare data signals for transmission.

In the field of audio electronics, the term "equalization" has come to include the adjustment of frequency responses for practical or aesthetic reasons, often resulting in a net response that is not truly equalized. The term EQ specifically refers to this variant of the term. Stereos typically have adjustable equalizers which boost or cut bass or treble frequencies. Broadcast and recording studios use sophisticated equalizers capable of much more detailed adjustments, such as eliminating unwanted sounds or making certain instruments or voices more prominent.

Equalizers are critical to the successful operation of electronic systems such as analog broadcast television. In this application the actual waveform of the transmitted signal must be preserved, not just its frequency content. Equalizing filters must cancel out any group delay and phase delay between different frequency components.

Other articles related to "equalization":

BRP-PACU
... to configure any sound system with an appropriate equalization and delay ... These data allow one to perform final equalization using just the input/output of the DSP or any other device used for Equalization ...
WOOx Technology - Active Equalization
... As a result, additional equalization applied near the enclosure's tuning frequency can increase system output without generating extraneous noises or greatly increasing cone excursion of ... mini-stereo systems produced by Philips feature a three-level equalization control which applies additional bass equalization at frequencies which excite the wOOx ... This use of active equalization to increase overall system output is the primary characteristic that differentiates wOOx technology from typical loudspeaker systems equipped with passive radiators ...
Turntables - Equalization
... must be rescaled to their original, flat frequency response—known as "equalization"—as well as being amplified ... A phono input of an amplifier incorporates such equalization as well as amplification to suit the very low level output from a modern cartridge ... Inexpensive and moderate performance discrete phono preamplifiers with RIAA equalization are available, while high-end audiophile units costing thousands of dollars continue to be ...
Canadian Transfer Payments - Equalization Payments
... the only province to have never received equalization payments in 2009-2010 Ontario will receive 347 million dollars, while Newfoundland, which has received ... Canada's territories are not included in the equalization program - the federal government addresses territorial fiscal needs through the Territorial ... Equalization payments are based on a formula that calculates the difference between the per capita revenue yield that a particular province would obtain using average tax rates and the national average per ...
Equalization - Uses - Digital Telecommunications
... distortion, which is dealt with by automatic equalization or by abandoning the worst frequencies ...