【作者】 郝健；

【导师】 殷福亮； 陈喆；

【作者基本信息】 大连理工大学 ， 信号与信息处理， 2011， 硕士

【摘要】 随着数字信号处理技术与芯片的发展,数字音效处理技术在人们的生活中随处可见。同时,伴随着3G的发展,手机终端也高速发展,数字音效处理技术在手机上应用成为可能。Android操作系统是Google推出的一款专为移动平台定制的操作系统,该系统已经成门智能手机中最热门的操作系统,关于Android的开发也越来越多。随着人们对音乐品味的提高,人们对手机的要求也越来越高,在Android上进行音效处理开发成为一种必要。本文在介绍Android操作系统的发展与开发平台的基础上,进行了数字音效的研究,重点研究了均衡器的算法。对现有方法进行分析对比,根据手机平台的需要选择计算量较小的IIR滤波器进行均衡器设计,采用双线性变换法将模拟滤波器变换到数字域。此方法虽然计算简单,但是存在着高频频率畸变、均衡器增益不准确的缺点。本文分析了增益不准确的原因,减少相邻频段的干扰,提高均衡器准确性。最后,本文将改进后的方法在Android平台实现,测试结果表明算法能够在手机平台运行,且均衡效果理想。更多还原

【Abstract】 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.更多还原