Design and Implementation of High-Precision Digital Audio Equalizer Based on FPGA

By adjusting a variety of different frequency signals, equalizer compensates or optimizes system deficiencies, equalizer is used in voice, communication systems, mechanical vibration, fault diagnosis and many other fields. Traditional analog equalizer has low precision, phase nonlinearity and more distortion characteristics. On the basis of this, a new digital equalization algorithm that abandon the traditional single FIR filter implementation method is proposed, frequency division effect is achieved by multiple phase sub-band filter row and multi-channel digital potentiometer, so the cost of digital equalizer design and difficulty of implementation are reduced, and flexibility of digital equalizer settings on the real-time system is improved. In this paper, QuartusII is applied to functional simulation, and downloaded into the FPGA via JTAG interface to verify the correctness of the results.