Research On Algorithms Of Equalizer Based On Android

With the development of digital signal processing technology and chips, digital audio effect processing technology has been used in everywhere of people's lives. Meanwhile, with the development of 3G, mobile terminals have developed with high speed, it is possible to use digital sound processing technology in the mobile phone applications. Android is the most popular smart phone operating system, along with the improvement of people's musical tastes, audio processing on Android is necessary.This paper describes the development of the Android operating system and platform, researches digital audio effect algorithm, especially the equalizer algorithm. Base on analysis and comparison of existing methods, according to the needs of mobile platform, the IIR filter design method is selected. The analog filter is transformed to the digital domain with bilinear transformation. The calculation is simple, but there is distortion at high frequency, and the equalizer gain is inaccurate. This paper analyzes the reasons for the inaccurate gain, reduce the adjacent band interference and improve the accuracy of the equalizer.At last, this method is realized on the Android platform. The test results show that the algorithm can run in the mobile platform, and the results of the results are satisfactory.