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A 23 band audio equalizer is designed. 23 frequencies are derived through various experiments and equations. A hardware sample circuit is made on the Vero board to fulfill the objective. Our observation and experiment has been done to calculate the Centre frequency for the resistor and capacitor of the band, Bandwidth, -3dB cutoff frequency points and closed loop voltage gain. This is the process of our full observation.
A 23 band audio equalizer is designed with multiple feedback band pass filters and it looks simple in design (Wang and Cao, 2018). Sound converts into light in this system. The 23 frequencies are derived through various experiments and equations. We have to know the quality factor, center frequency, upper frequency, and lower frequency for it. The capacitor and resistor formulas can be obtained through the calculator programme. Two 100nf capacitance is also necessary for the operation. Op amp can be used for low frequencies and a very high-speed unit is necessary for the 23 band audio equalizer. With various calculations, we can find out the 23 frequencies of the 23 band audio equalizer.
One of the most important parameters of a band pass filter is Quality or Q. Quality determines the bandwidth (Basha et al. 2019). Maximum Quality or Q of an audio system that recognizes the ? octave filter set. The ? octave filter has the ability to cover thirty separate filters. If the Quality or Q is 10 then bandwidth is Centre frequency’s 1/10th. Q of 10 in 100 Hz bandwidth -3dB frequencies on any other side of resonant peak.
Let’s take Quality factor Q = 3 as in the audio system maximum Q is about four. This is the reason behind choosing Quality Factor 3.
The circuit has been designed in the Vero board (RECIOUI et al.2018). There are three resistance which has the values 8.2 kilo-ohms, 510 ohm and 18 kilo ohms respectively and the value of the two capacitance 13.4 nF. Calculation of center frequency, bandwidth, -3dB frequency points and closed-loop voltage also happened. TL071 op amp is also there. Use of wire has been done for the connection.
A 23 band audio equalizer has been formed through the multiple feedback band pass filter. In the 20th band there is three resistance of kilo ohms 510ohm and 18 kilo ohms. There are two capacitances of 13.8 nF (Basha et al. 2019). There is also a TL071 op amp. A hardware model was also formed with these materials. Twenty three frequencies are also derived from experiments and equations.
In this observation, analyses the process of 23 frequency derivation, Octave and Quality factor. Determination of Centre frequency for the resistor and capacitor of the band, bandwidth, -3dB cutoff frequency points, closed loop voltage gain also calculated. Briefly discuss the hardware circuit which is done in the Vero board and give a small report on the topic.
Basha, M., Sibley, M.J. and Mather, P.J., 2019. Design and implementation of a long range indoor vlc system using pwm. Annals of Emerging Technologies in Computing (AETiC), Print ISSN, pp.2516-0281.
Basha, M., Sibley, M.J. and Mather, P.J., 2019. Models of Research and the Dissemination of Research Results: the Influences of E-Science, Open Access and Social Networking. Annals of Emerging Technologies in Computing (AETiC), 3(1), pp.20-27.
RECIOUI, A., HAMRIOUI, F.Z., BENAMROUCHE, K. and MERABET, O., 2018. Analog Filter Design: A Succinct Investigation. Algerian Journal of Signals and Systems, 3(4), pp.174-189.
Wang, B. and Cao, Z., 2018. Design of active power filter for narrow-band power line communications. In MATEC Web of Conferences (Vol. 189, p. 04012). EDP Sciences.
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