The equalizer in the definition and classification

The equalizer is a way you can individually adjust various frequency signal on a large number of electronic devices, through a variety of different frequency signal adjustment to compensate for speaker and acoustic field flaw, compensation and modified various sound sources and other special effects, sound mixer on the equalizer only on high-frequency, low frequency, paragraph frequency signals be adjusted separately. The equalizer is divided into three categories: graphic equalizer, parametric equalizer and room equalizer. 1. graphic equalizer: also known as chart equalizer, through Panel sliding key distribution to visually reflect the equalization curves, the frequency of lifting and decay at a glance, it takes constant q-value technology, each frequency has a sliding potentiometer, regardless promoting or attenuation of a frequency, filter frequency bandwidth is always the same. Common professional graphic equalizer is 20Hz ~ 20kHz signal is divided into 10, 15, 27 and 31 to be adjusted. So people according to the different requirements of different segments respectively select frequency equalizer. Generally 10 Equalizer frequency point to octaves interval distribution, use in normal situations, 15 Equalizer is 2/3 octave equalizer, used in professional sound reinforcement, 31 Equalizer is 1/3 octave equalizer, most are in the more important needs fine compensation occasions, graphic equalizer structure is simple, intuitive and straightforward, so the application in professional audio is extensive. Octaves: two frequency compared to 2 voice frequency range, between a octaves of the pitch between the octave, i.e. frequency every double pitch increase a octaves, graphic equalizer for each frequency is between octaves. 15 Equalizer is 1/3 octaves, 31 Equalizer is 2/3 octaves. 2. a parametric equalizer: also called parameter equalizer, adjust the balance of the various parameters can be careful adjustment of the equalizer, many attached in a mixer, but there are separate parameters of the equalizer and adjust parameters includes band, frequency, gain, and quality factor Q value and so on, can beautify (including defamation) and modified sound, make the sound (or music) style more prominent, and variety reaches the required artistic effects. 3. room Equalizer: to adjust the room of the frequency response curve of the equalizer. Due to the decorative materials on different frequency absorption (or reflection) of different and normal effect of acoustic resonance cause staining, so you must use the room equalizer for acoustical field flaw be objectively frequency compensation adjustment. Band get smaller, the more acute in the regulation of peaks, i.e. the value Q (quality factor), adjust the more delicate when compensation, a band of thicker then adjust the peak is wide, when acoustic transmission frequency characteristic curve is more complex, more difficult to compensate.