摘要
音频变调是在保持旋律和节奏的基础上改变音乐的调性,许多应用都要求实时实现,然而关于实时算法实现的问题还少有文献涉及。改造后的实时变调算法与实现方案通过合理控制CPU时钟和AD/DA时钟的时序关系,不仅能够在两个八度音范围内进行有效的变调,而且能够对实时输入的音频信号进行同步变调输出,在Windows平台上验证实验还表明新方案具有较低的CPU占用率和内存消耗,能够满足实时应用的要求。
Pitch scaling,to transpose the tonal pitch of a sound while keeps the rhythm and melody,is needed in many real time audio applications.However,its real time implementation is seldom referred to.A better algorithm and corresponding real time implementation scheme are proposed.By methodic arranging the clocks of CPU and AD/DA,the scheme can not only scale the pitch in two octavs range effectively,but also process the real time input audio for synchronous scaling output.The experimental results on Windows platform indicate the modest CPU and memory consumption,so as to meet the requirement of real time applications.
出处
《计算机工程与应用》
CSCD
北大核心
2007年第8期4-7,共4页
Computer Engineering and Applications
基金
陕西省科学技术研究发展计划项目(the Science and Technologies Research plan of Higher Education of Shaanxi Province
China under Grant No.2005k04-G23)
关键词
实时变调
音调
实时音频处理
Windows音效
real time pitch scaling
pitch
real time audio processing
Windows audio effect
作者简介
E—mail:mailfzh@nwpu.edu.cn付中华(1977-),男,博士后,主要研究领域为说话人辨识/确认,语音信号处理,说话人定位及跟踪;张艳宁(1968-),女,教授,博士生导师,主要研究领域为智能信息处理,数据挖掘,模式识别,计算机视觉。