DTMF is a reliable and mature technology. Because it can provide the higher dialing speed, it has rapidly replaced the dial pulsingsignal which the traditional dial telephone used.
A model of vortex signal in the state of pulsing flow is studied, and a new frequency measuring technique is proposed.
研究脉动流条件下涡街信号的模型，提出频率测量的新方法。
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The system operates in a fail-safe mode since the microprocessor is controlling the EXPOSE signal and in addition pulsing a second signal at a 400Hz rate.