Design Of Graphic Equalisers

Design Of Graphic Equalisers

A graphic equaliser is an electronic device used to adjust the tonal quality of audio signals by boosting or cutting specific frequency bands. It typically consists of a series of sliders, each representing a different frequency band, that can be used to boost or cut the level of that particular frequency. Graphic equalisers are commonly used in audio production, sound reinforcement, and home audio systems to tailor the sound output to the listener's preferences. To design a good graphic equaliser, several criteria must be considered. Firstly, the frequency response should be as flat as possible, meaning that each frequency band should have the same level when all sliders are in their neutral position. The range of frequencies should also be wide enough to cover the audible spectrum, typically ranging from around 20 Hz to 20 kHz. Secondly, the number of frequency bands should be sufficient for the intended application. Professional audio equipment typically features 31 or more bands, while home audio systems may only have 10 or 15. The spacing between the frequency bands should also be consistent to allow for accurate adjustments. Thirdly, the precision of the sliders should be high enough to allow for subtle adjustments, ideally with steps of 1 dB or less. The sliders should also have a smooth and consistent response, without hysteresis or other nonlinear behaviour. Finally, the noise and distortion introduced by the equaliser should be as low as possible. This can be achieved through careful circuit design and component selection, as well as shielding and grounding of the device. In summary, a good graphic equaliser should have a flat frequency response, sufficient frequency bands with consistent spacing, precise and smooth sliders, and low noise and distortion.

Graphic equaliser, frequency response, frequency bands, precision, noise, distortion

— Christopher Green