摘要
语音的变速(变快或变慢)处理是目前十分流行的一项语音处理技术。语音信号是时变的,但这种时变特征相对于语音信号的频率而言其变化是非常缓慢的。短时傅里叶分析是分析缓慢时变频谱的一种简便方法。介绍了利用短时傅里叶分析,从频域的角度,采用相位调整法来对语音信号进行变速的实时处理,并用DSP芯片ADSP2188M进行了仿真,其结果较令人满意,基本达到了变速不变调、音质高保真的效果。
Altering voice speed （faster or slower） is now a popular kind of vocal signal processing technique. Vocal signal is time-variant, but truly slow in change compared to the frequency of the vocal signal. The short-time Fourier transform （STFr） method is a simple way to analyze the slowly time-variant frequency chart. A phase-modified algorithm （by means of STFT） for real-time realization of altering voice speed based on ADSP2188M is introduced. The result is a satisfaction fulfilling the need of high-quality time-scaling voice signal processing.
出处
《测控技术》
CSCD
2006年第7期17-19,21,共4页
Measurement & Control Technology
关键词
语音变速
变速不变调
短时傅里叶变换
相位调整
altering voice speed
time-scaling without pitch-scaling
STFT
phase-modification
