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
Visualize sound from your Android's microphone.
Technical specification:
Recording
☆ Sample rate: 44100 Mono
☆ Chart buffer: 5 seconds
Decibel Level
☆ Reference pressure p0 = 20uPa
☆ 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:
☆JTransforms for FFT calculations. https://github.com/wendykierp/JTransforms