The system includes the dual-tone multifrequency signal detection module, the musical sound processing module, the harmonical analysis module of circularity and many other demonstration modules.
系统包括话机按键双音频信号识别、圆轮廓形状误差谐波分析、数字音频效果及原理性演示实验等。
Signaling took the form of a series of multifrequency (MF) tones, much like touch tone dialing between switches.
信号将一系列的方式多频(MF)音调，很像之间互动音频拨号开关。
Signaling took the form of a series of multifrequency (MF) tones, much like touch tone dialing between switches.
信号将一系列的方式多频(MF)音调，很像之间互动音频拨号开关。
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