Sound-level-measurement

This VI is simple example for those who want to start working with LabVIEW. this vi counts down to zero the number that user enters.

说明：  通信原理各种模拟信号的调制仿真，包括AM、FM、2DPSK等调制的仿真。(Modulation simulation of various analog signals in communication principle, Including AM, FM, 2DPSK modulation simulation.)

用LabVIEW编制一个完整应用软件，完成以下功能： 1、产生一个正弦波，叠加一个噪声信号，从界面上可以调整噪声和信号的幅度、频率等参数，此信号作为后续分析的信号源； 2、显示信号的时域波形，点击按钮可以显示信号的幅度谱、功率谱 3、图形上可以显示光标，具有峰值跟踪功能，同时将峰值频率、幅度显示在界面上。 4、点击按钮可以计算显示信号的失真度（THD）、信噪比（SNR）、各次谐波的频率和幅度；(Preparation of a complete application using LabVIEW software, perform the following functions: 1, generates a sine wave, the superposition of a noise signal, the interface can be adjusted from the noise and the signal amplitude, frequency and other parameters, this signal as a follow-up analysis of the signal source 2. time-domain signal waveform display, click the button to display the signal amplitude spectrum, power spectrum 3, you can display a cursor on the graph, with a peak tracking, while the peak frequency, amplitude displayed on the screen. 4, click the button to display the calculated distortion (THD) signal to noise ratio (SNR), each harmonic frequency and amplitude )

在labview，对串口接收来的十六进表示的字符串进行一系列处理，如删除空字符、匹配搜索、截取字符串、数据解算等，得到想要的信息(In LabVIEW, a series of processing of the sixteen incoming strings received by the serial port, such as deleting empty characters, matching search, intercepting string, data solving, etc., gets the desired information.)

VB中使用Labview的 绘图控件，把vb和Lab􀀁 VIEW在数据采集、显示与处理方面的优势结合起来, 互相取长补短, 从而开发出功能更加强大的测控软件系统。(Use of Labview drawing control in VB, vb and Lab 魛?the VIEW in the data acquisition, display and processing advantages combine to complement each other in order to develop a more powerful monitoring and control software system.)

通过输入域名，打开默认浏览器加载网页，实现第三方加载。(open web)

LabVIEW设计的扫频仪代码，需要用LabVIEW打开(LabVIEW Design Scanner code needed to open LabVIEW)

labview 程序，实现框选操作，可以用于图像的截图显示VI(Screenshot labview program to achieve marquee operation, can be used to display an image VI)

说明：  根据倾角仪输出信号labview实时显示曲线图像的labview程序(Real-time display of curve image based on LabVIEW output signal of inclinometer)

对信号进行采集和保存，其采样率默认为信号频率的10倍，并将采集到的信号数据保存到电子表格中(Save signal data acquisition and preservation of the signal, the default sampling rate is 10 times the signal frequency, and collected into a spreadsheet)