Spectrum Spectrogram Analyzer

Designed with accuracy and easy of use in mind.

Can be used for monitoring or measuring environmental sound or noise; help tuning instruments; timing short sound events; and educational purpose.

Features:

* No Ads.

* With log or linear frequency axis.

* Can label frequency axis using music pitch note.

* Support all possible sampling rates and almost all recorder sources of your device.

* Graph with nice grid lines and labels, easy to operate.

* FFT sample size range from 512 to 8192. Using half-overlapped (adjustable) time window to increase time resolution.

* Various window functions provided, for different frequency resolution and dynamical range.

* Peak frequency detection (in unit of Hz and note+cent), with a moderate accuracy (FFT + interpolation).

* With dB or A-weighting dB (dBA).

* Can record the audio in wav (PCM) format.

* Pinch to zoom, drag or swipe to move, long-press to place cursor, double touch to reset zoom.

Notes:

** May need some knowledge of discrete Fourier transform and spectrum analysis to use it well.

** The actual accuracy mainly depends on your device. No calibration interface provided.

Comments and suggestions are welcome.