The system can issue a pure tone, tone twitter, narrowband noise and natural sound of the voicesignal, and can adjust the loudness and frequency of the signals with some accuracy.
该系统能发出纯音、啭音、窄带噪声和自然声等声音信号，并可对信号进行一定精度的响度和频率调节。
2
Methods the noise on high frequency domain was obtained and magnified after the pathologic voicesignal was decomposed on multiple levels by means of the wavelet transform.
方法应用小波变换对早期病理嗓音信号进行多重分解，提取和放大频谱的高端噪声。
3
Results the relative signal-to-noise ratio of the pathologic voice on high frequency differed significantly from that of the normal voice.