CZT变换在声音啸叫频谱检测中的应用与研究

Application and Research of the Algorithm of Chirp Z Transform in Sound Whistling Detection

声反馈是电声系统中常见的一种现象,严重的声反馈会使电声设备产生啸叫甚至烧坏电声系统中的放大器,为了解决上述问题,采用了线性调频Z变换法对啸叫信号频谱进行细化,从频谱图可以看出,CZT变换比快速傅里叶变换可以更精确的得到信号的频谱,能够检测出声音中的噪声频段,为噪声消除提供很好的算法依据,结合DSP硬件设备,可以快速消除电声系统中的噪声.

Acoustic feedback is one of the most common phenomena in electro-acoustic systems. Severe acoustic feedback can cause the electro-acoustic devices to generate Sound Whistling or even damage the amplifiers of electro-acoustic systems. In order to solve the problem, this study uses the linear frequency modulation Z transform method to refine the signal of the howling signal. Simulation spectrums show that CZT transform can obtain the spectrum of the signal more accurately than the fast Fourier transform, and can accordingly detect the noise band in the sound, which provide algorithm basis for the following noise elimination. By combining DSP hardware devices, CZT method can readily eliminate the electro-acoustic system noise.