: Sound Spectrum

1.07 for Android

3.3 | 5,000+ Instal

Meerkat Laboratory

Unduh APK（1.7MB）

Penjabaran dari 9apps Sound Spectrum

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