FNam FFT Spectrogram Analyzer

■ Turn your smartphone into a professional audio analysis tool.

[Video Guide - See it in action]

https://youtu.be/72SYLTG0l_8

FNam Audio & FFT Analyzer is a precision tool designed for sound engineers, researchers, students, and audio enthusiasts who need accurate frequency analysis and data logging.

■ Exclusive Features (Why FNam?)

Unlike typical sound meter apps, this app offers advanced features like Dual File Comparison and CSV Export, enabling detailed post-analysis of audio data.

■ KEY FEATURES

1. Real-time Audio Analysis

• High-precision FFT (Fast Fourier Transform) Graph.

• Time Domain Waveform (Oscilloscope) view.

• Fluid Spectrogram for visualizing frequency changes over time.

2. Dual File Comparison (Exclusive Feature)

• Simultaneous loading of two WAV files for comparative analysis.

• Spectrum Overlay: Visually compare differences using color-coded traces (Blue vs. Magenta).

• Instant Calculation: Provides Arithmetic Mean and Mean Difference between signals.

3. Data Logging & Export

• Flexible Sampling Rates: Supports various rates (4000Hz, 8000Hz, 16000Hz, 22050Hz, 44100Hz).

• High-quality Recording: Audio is recorded and saved as WAV files, strictly matching the selected sampling rate.

• Raw Data Export: Exports raw PCM data to CSV format. The exported data maintains the exact sampling rate and duration, making it optimized for post-processing in Excel, MATLAB, or Python.

• File Management: Files are stored in the 'Download\FNamDoc' directory.

- WAV naming format: Date_Time_SampleRate_Channel.wav

ex) 20260219_164715_44100Hz_Mono.wav

- CSV naming format: Selected WAV file name_SampleRate_Duration(s).csv

ex) 20260219_164715_44100Hz_Mono_44100_5.2s.csv

4. Professional Configuration

• Window Functions: Selectable Rectangular, Hann, Hamming, and Blackman windows.

• Frequency Weighting: Supports A, B, C, and Z (Linear) standard weighting filters.

• Axis Control: Supports both Auto-scaling and Manual range settings (Hz / dB) for precise graph inspection.

• Calibration: Independent offset controls for FFT and Time Domain to ensure alignment with professional reference equipment.

• Max Peak Hold: Displays and holds the maximum amplitude values across the frequency spectrum.

■ TECHNICAL SPECIFICATIONS

• Signal Processing: Anti-aliasing filters are automatically applied during downsampling to ensure measurement accuracy.

• Sampling Rate: Supports standard rates up to 44.1kHz (device dependent).

• Standards: Implements IEC 61672 formulas for accurate weighting calculations.

⚠️ Note: While this app uses IEC 61672 standard formulas, measurement discrepancies compared to professional equipment may occur due to the hardware frequency response limitations of the built-in smartphone microphone. For critical measurements, the use of a calibrated external microphone is recommended.