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用于提取和传送调制AC信号信息的系统和方法
System and method for extracting and conveying modulated AC signal information
US-7825822-B2一种从调制AC信号中提取信息的电路系统。
专利摘要
提供了一种用于从调制AC信号中提取幅度和频率信息的经济型系统和方法。在一个实施例中，本发明包括实现运算放大器、双二极管、滤波器和比较器的电路，以接收和操纵调制AC信号。双二极管接收AC信号并将其分成两条独立路径，包括基线路径和滤波路径。通过基线路径的AC信号基本保持不变，而通过滤波路径的AC信号通过低通滤波器。然后信号被发送到比较器，用于比较来自两条路径的AC信号的幅度，比较器输出由微处理器接收，用于控制显示器，该显示器响应于比较器输出产生视觉指示。
Original abstractAn economical system and method for extracting amplitude and frequency information from a modulated AC signal are provided. In one embodiment, the invention includes a circuitry implementing op amps, a dual diode, a filter, and a comparator to receive and manipulate the modulated AC signal. The dual diode receives and splits the AC signal into two separate paths, including a baseline path and a filtering path. The AC signal passing through the baseline path remains substantially unchanged, and the AC signal passing through the filtering path passes through a low-pass filter. The signal is then sent through a comparator for comparing amplitudes of the AC signal from the two paths, and the comparator output is received by a microprocessor for controlling a display that generates a visual indicia responsive to the comparator output.
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