基于FPGA的语音信号波形VGA显示方法  

FPGA-based speech signal waves displayed on VGA screen

作　　者：陶中幸[1] 

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《液晶与显示》2016年第2期185-192,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.61263036);西北师范大学青年教师科研能力提升计划项目(No.NWNU-LKQN-14-21)~~

摘　　要：在基于FPGA的语谱分析研究与设计中,需要将语音时域波形和语谱分析结果同时显示在VGA屏幕上,而采用一般方法只能在有限的VGA显示区域内显示局部波形,无法将完整的一段语音信号波形显示出来。针对这一问题,提出了一种适合FPGA实现的语音信号波形VGA显示方法。该方法通过分析语音信号的波形特点,以及显示中存在的波形放大、波形缩小两个问题,提出线性插值和保留极值的解决方法,并详细探讨了这两种方法的FPGA硬件实现结构。实验结果表明,该方法能够有效地对语音信号进行正确显示。The speech time-domain waveform and spectrogram analysis results displayed simultaneously on the VGA screen are required in the research and design of spectrogram based on FPGA,by general method,only parts of the waveforms can be displayed in the limited VGA display area,and failed to display complete speech signal waveform.To solve this problem,a method suitable to display VGA speech signal waveform based on FPGA implementation is presented in this paper.By analyzing the speech signal wave characteristic and the problems of waveform zooming in/out in the waveform display,we proposed the solution of linear interpolation and keep-extremum method,and discussed the FPGA implementation structure of the two methods in detail.Experiments show that speech signal can be displayed properly by the method.

关 键 词：现场可编程门阵列 语音信号 波形缩放 波形显示方法 视频图形阵列 

分 类 号：TN912.3[电子电信—通信与信息系统] TN873[电子电信—信息与通信工程]