Hi Mi Fans,
Welcome to Tech Class Session. Equalization or equalization 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 or "frequency ranges".
In sound recording and reproduction, equalization is the process commonly used to alter the frequency response of an audio system using linear filters. Most hi-fi equipment uses relatively simple filters to make bass and treble adjustments. Graphics and parametric equalizers have much more flexibility in tailoring the frequency content of an audio signal. An equalizer is a circuit or equipment used to achieve equalization. Since equalizers, "adjust the amplitude of audio signals at particular frequencies," they are, "in other words, frequency-specific volume knobs."
Equalizers are used in recording studios, radio studios, and production control rooms, and live sound reinforcement and in instrument amplifiers, such as guitar amplifiers, to correct or adjust the response of microphones, instrument pickups, loudspeakers, and hall acoustics. Equalization may also be used to eliminate or reduce unwanted sounds (e.g., low hum coming from a guitar amplifier), make certain instruments or voices more (or less) prominent, enhance particular aspects of an instrument's tone, or combat feedback (howling) in a public address system. Equalizers are also used in music production to adjust the timbre of individual instruments and voices by adjusting their frequency content and to fit individual instruments within the overall frequency spectrum of the mix.
In the field of audio electronics, the term "equalization" (or "EQ") 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 and basic guitar amplifiers typically have adjustable equalizers which boost or cut bass or treble frequencies. Mid- to high-priced guitar and bass amplifiers usually have more bands of frequency control, such as bass, mid-range, and treble or bass, low-mid, high-mid, and treble. Some amps have an additional knob for controlling very high 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.
The most common equalizers in music production are parametric, semi-parametric, graphics, peak, and program equalizers. Graphic equalizers are often included in consumer audio equipment and software which plays music on home computers. Parametric equalizers require more expertise than graphic equalizers, and they can provide more specific compensation or alteration around a chosen frequency. This may be used in order to remove unwanted resonances or boost certain frequencies. An acoustic guitarist who finds that her instrument sounds too "boomy" may ask the audio engineer to reduce the low-frequency range response, to correct this issue. A guitarist who finds that the instrument sound in the PA has too much finger noise may ask the engineer to reduce the higher frequency range response.
In sound recording, equalization is used to improve an instrument's sound or make certain instruments and sounds more prominent. For example, a recording engineer may use an equalizer to make some high-pitched in a vocal part louder while making low-pitches in a drum part quieter.
Equalization is commonly used to increase the 'depth' of a mix, creating the impression that some sounds in a mono or stereo mix are farther or closer than others, relatively. Equalization is also commonly used to give tracks with similar frequency components complementary spectral contours, known as mirrored equalization. Select components of parts which would otherwise compete, such as bass guitar and kick drum, are boosted in one part and cut in the other, and vice versa so that they both stand out.
An equalizer can be used to correct or modify the frequency response of a speaker system rather than designing the speaker itself to have the desired response. For instance, the Bose 901 speaker system doesn't use separate larger and smaller drivers to cover the bass and treble frequencies. Instead, it uses nine drivers all of the same four-inch diameter, more akin to what one would find in a table radio. However, this speaker system is sold with an active equalizer. That equalizer must be inserted into the amplifier system so that the amplified signal that is finally sent to the speakers has its response increased at the frequencies where the response of these drivers falls off, and vice versa, producing the response intended by the manufacturer.
Tone controls (usually designated "bass" and "treble") are simple shelving filters included in most hi-fi equipment for gross adjustment of the frequency balance. The bass control may be used, for instance, to increase the drum and bass parts at a dance party, or to reduce annoying bass sounds when listening to a person speaking. The treble control might be used to give the percussion a sharper or more "brilliant" sound, or can be used to cut such high frequencies when they have been overemphasized in the program material or simply to accommodate a listener's preference.
How Does It Work?
Equalizers work in ranges, or “bands.” Odds are that your car at the minimum has a dual-band EQ, meaning you can cut and boost the high and low ranges. These are also referred to as “treble” and “bass” bands, respectively. Nicer sound systems may have three, five, or even up to twelve bands. Professional music equipment uses twenty to thirty bands. The more bands you have, the more divisions you have in the wide range of human hearing. Because of this, each band controls a small range of frequencies, thus allowing more control over the sound.
Audio filters are used to isolate bands, usually in a bell shape around a central band. In a hardware system, these filters can get pretty complicated, but it’s pretty easy to see thanks to graphic EQs. You can adjust knobs visually very easy to get what sounds you like. Software EQs, like those in your audio player of choice, essentially imitate this setup.
Presets and Custom Settings
Presets can work to help make things sound a little better, but it’s more of a generic fix. Creating some custom settings and presets and being able to switch through them is ideal, so you can match them to songs, artists, or albums. The best thing to do is to close your eyes and listen. As always, do what sounds better to your ears.
All of the sliders are centered on a certain frequency, in Hz. The bottommost one is 70 Hz, and the topmost one is 16,000. There’s also a preamp on the left side, which lets you boost the overall gain, in case you’re cutting a lot more than boosting and you want to make up for the loss in volume. Winamp also has a ridiculous 250-band EQ plugin.
It even lets you set different EQ curves for your left and right channel. Admittedly, it’s a bit of overkill, but it provides a great example of how customizable things can get.
Often, software EQs come with presets for many different genres of music. While audio purists will often say that you shouldn’t set EQs for genres, the fact of the matter is that it can make a big difference for normal listeners. A lot of music – especially pop music – can get to be sort of homogenous. Let’s take the example of “generic” techno, which usually has pumping beats and high melodies. If you have speakers that muddle this into sounding flat, then a techno EQ will help by boosting the low and high bands.
With the vast ranges of frequencies in any particular song, this can make a noticeable difference, or it may not. You have to tailor the preset for the music you listen to. Classical music has rich mids and the high end can sometimes overpower, while vocal tracks focus usually on mids and highs and less on the low end. And many songs in both of these genres don’t follow this pattern at all, so you’ll have to adjust accordingly.
Equalizers, or EQs, are pretty ubiquitous, a fact that’s the testament to the impact it has. Sure, you can load presets, but they don’t always work perfectly. Knowing how they work will allow you to make your own curves and can change the way you hear your music completely.
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Chapter 6: Internet of Things & Mi Home
Chapter 7: (IR) Infrared Blaster
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Chapter 10: PDAF and its difference with CDAF
Chapter 11: All about Network Bands
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Chapter 13: All About Kernel
Chapter 14: All you need to know about wi-fi
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Chapter 19: All About Data Cables
Chapter-20: All About Batteries
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Chapter 24:All About Barcodes
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Chapter 26: All You Need To Know About Virtual Reality(VR)
Chapter 27: All You Need To Know About APN
Chapter 28: All About IP(Ingress Protection)Ratings
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