Equalization - Posted on 2017-03-13 by Corrine Selden

Here are a few highlights from what I learned about equalization in Chapter 13:

• A resistor works to hinder the flow of electricity. 
• An EQ is usually a combination of filter circuis. 
• After more than 100 years of study, the discharge of a capacitor was found to be oscillatory. 
• William Thompsonwas the physicist who solved early cable issues in long distance transmissions.
• A low pass filter allows frequencies below a user defined center frequency to pass unaffected. 
• The three main parameters for a parametric EQ are bandwidth, frequency, and amplitude. 
• The telegraph/telephone was instrumental in the development of equalization technology. 
• A Parametric EQ gives the user all three parameters of EQ--bandwidth, frequency, and amplitude. 
• An inductor stores energy in an electromagnetic field. 
• The forerunner to the modern graphic EQ was the Langevin EQ-215A.
• A notch filter is basically a peaking filter with a very narrow bandwidth. 
• Early equalization was developed to assit in long distance voltage transmission. 
• A Selectable Frequency EQ allows the user to select from a group of predefined center frequencies and adjust amplitude levels according to a predefined bandwidth amount. 
• A Graphic EQ (Fixed Frequency) EQ has predefined center frequencies and a predetermined bandwidth amount. All the user has control over is the amount of boost and cut.