Speaker Meter 與 Sound Meter Plus 使用情況與統計

This App is the easiest way to measure frequency response of your loudspeakers. It seriously evolved since first concept to concentrate on basics: provide in 3 clicks and 1 minute a complete overview of the frequency response of your HiFi system. It does NOT work with AirPlay / Bluetooth speakers. How it works: 1/ point towards the speaker you want to monitor first 2/ select left or right speaker icon to send a white noise signal to your HiFi system (provided you connected your iDevice to it through a wired connection *) Within few seconds, the recording will stop automatically and results will be stored internally 3/ repeat steps 1 & 2 for the other speaker 4/ select your prefered option to export results (*) take care that AirPlay does not support "Play and Record" types of applications. But if you cannot use a wired connection, any white noise source will work This App was seriously designed for my own needs: I am a signal processing expert. If your need is an audio generator, try this App: "Diapason Audio Generator". If your need is a full-featured soundmeter, try this one: "SPLnFFT Noise Meter". Any comment, any feedback ? There is a blog for this.

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Sound Meter Plus

Sound Meter is a utility tool that shows decibel values by measure the environment noise, measured and display dB values in various forms. Features: • Toggle Tap to start or stop record sound data • Save dB sound Data Image into camera roll • Save recorded sound into files app • Copy dB sound Data into Clipboard for advance operation • Show average, minimum and maximum decibel values in second • Indicates decibel by graph line • Display the current noise reference • Display decibel by graph line • Display Elapsed time of decibel • Can calibrate the decibel A sound level meter is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The diaphragm of the microphone responds to changes in air pressure caused by sound waves. That is why the instrument is sometimes referred to as a Sound Pressure Level Meter. The decibel is a unit of measurement used to express the ratio of one value of a power or field quantity to another on a logarithmic scale, the logarithmic quantity being called the power level or field level, respectively. It can be used to express a change in value or an absolute value. A noise level showing examples of sounds with dB levels ranging from 0 to 180 decibels. 180 - rocket launch 140 - jet engine at takeoff 120 - thunderclap 110 - rock band 100 - motorcycle 90 - lawn mower 80 - alarm clock 70 - shower 60 - conversational speech 50 - light traffic 30 - whisper 20 - rustling leaves 10 - a pin dropping 0 - healthy hearing threshold Sample Sound Data: [50.256, 51.245, ... , 65.359] You can calibrated your devices with an actual sound meter (dBA). Microphones in most devices are limited and can be use as an auxiliary tools. If you need more accurate dB values, we recommend actual sound level meter. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.