mr spectra

mr spectra is an fft based audio spectrum analyzer with built-in weighting filters (A-weighting for human hearing, C-weighting for machine sounds and Z-weighting with no filter).

Enjoy mr spectra with your music as a musical mood light.

Quick tips:
* Go to settings and add a decibel, wave or spectrogram scope.
* Swipe screen to zoom in or out on frequency and amplitude scales.
* Display or hide the X and Y axes. Show or hide the dB and Max dB values.
* Reset Max dB.
* Move the dB and Max dB values anywhere on the screen by dragging.
* Pause/ Play the running spectrum.
* Hide menu and play/pause buttons.
* Change spectrum color scheme from the app menu.

Display Settings:
* Select color scheme.
* Solid bars or line graphs.
* Landscape mode to mirror screen on to your TV.
* Show/ hide axes.

Scope Settings:
* Decibel Scope.
* Sound Wave Scope.
* Spectrogram.

Decibel Settings:
* Use A-Weighting, C-Weighting or Z-Weighting filters (dBA, dBC, dBZ).
* Show decibel and Max dB values.
* Set zero dB level.

FFT Options:
* Use Hann or rectangular windowing.

Technical Details:
* Input source: device mic.
* Sound captured: 16-bit PCM mono.
* Sampling rate: 44.1 kHz.
* Audio amplitude range: 1 to 32767.
* FFT latency: 23 ms.
* Decibel calculations: based on rms amplitude, relative to a base level of 1 rms. The base level can be adjusted by user to calibrate dB levels.