VIVA Zhang التطبيقات

This software is for noise measuringandspectrum analysis software. It is installed cell phone andtabletPC understand ANDROID operating system. Through thissoftware, wecan use the MIC of cell phone to do measure sound leveland analyzespectrum. So that we can know how noisy of theenvironment.The first interface is in BIG VALUE display mode which clearlyshowsthe current noise value.Switch interface can click on interface tab strip, there arethreedisplay modes: SINGLE, GRAPH, LIST.The gradient bar is charging correspondingly according to thenoisevalue.In the spectrum display area, beside the vertical coordinatetheyellow part stands for the current noise spectrum diagram, andtheupper and lower gray shadow parts stand for the spectrum ofthemaximum and minimum values, the top right corner shows thespectrummodel and overlap rate. In the right, the 3 blue bar graphis A, C,Z weighting graph.There’s a extra “keep2 ” in button area and it is used forkeepingdisplay spectrum curve. Each click, there will be shown thered,green, blue curve in spectrum display area, total 3curves.List display area shows the value of all frequency point.Above the List display area, there shows how long it takesforcalculating FFT one time. The number behind FIFO is the numberofdata is in buffer. Usually, this number will not continuetoincrease, if the number keeps increasing, it means themobileprocessing speed too slow which can lead to display delay anddatalost. In this way, we can reduce the sampling rate, linenumber,and overlap rate to refresh screen. Below the FIFO it showsthevalue of each frequency point, each page displays 10 rows.Press the menu button of cell phone, it will show entranceofsetting interface.Signal input set: there’re 2 ways of inputting signal likecellphoneMic mode and USB Mic mode.Sampling rate set: set the FFT sampling frequency. Range from4000Hz ~ 48 KHz.FFT lines set: 256, 512, 1024, 2048, 4096, 8192, 16384, 32768,65536are optional. When it is specified sampling frequency, thelarger ofFFT lines number, the finer of analysis, but thecorrespondinganalysis speed will be slow.Overlap ratio: 0%, 25%, 50%, 75%.Spectrum mode: FFT, 1/1 OCT, 1/3 OCT, 1/6 OCT, 1/12 OCT。Screen refresh time: (ms), the shorter of the time, thehigherrequirements for CPU.Axis Parameter set: set the Min and Max of X, Y coordinates.WhenFFT lines is too big, reducing the interval of X coordinatecancheck precisely some specified frequency points.Color set: elements of the color in coordinates.Cell phone Mic.: if there’s no iSV1600 measurement micinsertingcell phone, the app will use cell phone Mic.USB Mic: when use USB Mic manufactured by Hangzhou AihuaCompany,the APP setting should choose USB Mic mode.Calibration set: Auto calibration and Manual calibration.The Auto calibration interface is used with iSV1600 measurementMicor AWA14608 USB Mic. And also together with soundlevelcalibrator.Mic Sensiti.: the sensitivity level reading for lastmeasurementusing.(default is -26.0dB)Calibrator SPL: becasue the measurement limit of each phoneisdifferent, some phones’ measurement limit can’t reach 94dB,set84dB as SPL calibration, the user can switch accordingtorequirements.New sensiti: current calibration sensitivity.Current SPL: current calibration sound pressure levelCalibration signal adjustment: step by +1dB or +0.1dBStart: start auto calibration. Save: press “save” aftereverycalibration.Manual calibration interface:Input the positive or negative calibration value (in dB) onApp.Because the built-in MIC cannot be calibrated, manualcalibrationshould use the comparison of phone and professionalequipment. Forcalibration, please purchase our professional Mic orUSB Mic andsound level calibrator.