基于MSP430制作的频率计 输入一个低频信号可以测出频率-Based on MSP430 produced a low-frequency signal input frequency meter can measure the frequency

此调频接收机的设计可以分成调谐回路、高频放大、混频、本机振荡、中频放大、鉴频、低频功放等几个部分。-This design can be divided into the FM receiver tuning circuit, high frequency amplification, mixing, local oscillator, IF amplification, frequency, low frequency amplifier and other sections.

可以通过该上位机系统实现低频RFID刷卡回传上位机功能，并且能够显示数据-LF RFID can be implemented by the host computer system PC card backhaul capabilities, and the ability to display data

小波去噪，将噪声信号分解成低频与高频。采用类小波阈值去噪-Wavelet denoising the decomposed signal into low and high frequency noise. Wavelet thresholding using Class