Digital Signal Processing Reference
In-Depth Information
Fig. 10.
Amplified speaker system which has adjustable treble, bass and volume
5
Conclusion
This adjustable band-pass filter system needs capacitors, resistors, potentiometers, op-
amps, a input jack, a portable audio device , a speaker, lead wires, a DC power supply
and a breadboard. By combining low-pass, high-pass and band-pass filter signals with
summing amplifier and adjusting potentiometers values the output is an adjustable
band-pass signal. From analysis of the active filter theory to designing , simulating,
building and testing the whole circuit, the filter system achieves the satisfying results.
References
1.
Alexander, C.K., Sadiku, M.N.O.: Fundamentals of Electric Circuits. McGraw-Hill (2006)
2.
Zhu, L., Sun, S., Menze, W.: Ultra-Wideband bandpass filters using multiple-mode
resonator. IEEE Microwave and Wireless Components Letters, 1-3 (2005)
3.
Peng, F.Z.: Application issues of active power filter. IEEE Industry Application Magazine
(1998)
4.
Szentirmai, G.: Synthesis of multiple-feedback active filters. BSTJ, 527-555 (April 1974)
5.
Fleischer, P.E., Tow, J.: Design formulas for biquad active filters using three operational
amplifiers. Proc. IEEE 61(5), 662-663 (1973)
6.
Franko, S.: Design with Operational Amplifiers and Analog Integrated Circuits. McGraw-
Hill (1988)
