速報APP / 音樂與音效 / Sound Spectrum

Sound Spectrum

價格:免費

更新日期:2016-07-08

檔案大小:1.7M

目前版本:1.07

版本需求:Android 4.3 以上版本

官方網站:mailto:meerkat.lab@gmail.com

Email:https://www.mini-map.net/app/soundspectrum/privacy.html

Sound Spectrum(圖1)-速報App

Visualize sound from your Android's microphone.

Technical specification:

Recording

☆ Sample rate: 44100 Mono

☆ Chart buffer: 5 seconds

Decibel Level

☆ Reference pressure p0 = 20uPa

Sound Spectrum(圖2)-速報App

☆ decibel equation: 20 x Log10 (RMS/p0)

Frequency Spectrum

☆ Hanning Window

☆ FFT size: 4410 (100 ms)

☆ Overlapping: 80%

☆ Frequency: 1 Hz ~ 4 KHz over 64 groups

Credits:

Sound Spectrum(圖3)-速報App

JTransforms for FFT calculations. https://github.com/wendykierp/JTransforms

Sound Spectrum(圖4)-速報App