FNam FFT Spectrogram Analyzer

■ FNam FFT Spectrogram Analyzer

Engineers need tools that are ready to use — anytime, anywhere.

FNam FFT Spectrogram Analyzer turns your smartphone into a

professional audio analysis tool. Unlike typical sound meter apps,

it delivers advanced features like Dual File Comparison and CSV

Export for precise post-analysis

* completely free, no ads (core features).

Real-time FFT & Spectrogram / All processing runs on-device /

No audio data uploaded externally.

■ NEW FEATURES

1. Octave Band View Mode

- Analyze sound levels by octave bands.

- Choose 1/1 or 1/3 octave band resolution in Settings.

2. Sound Event Logger

- Automatically logs sound events when the level exceeds a set threshold.

- Can save event WAV files and FNam JSON logs for later review.

- Includes a screensaver mode to reduce screen burn-in.

3. Frequency Response Preview (requires FNam Frequency Noise Generator)

- Measures acoustic frequency response over WiFi TCP.

- Requires FNam Frequency Noise Generator.

■ Turn your smartphone into a professional audio analysis tool.

[Video Guide - See it in action]

https://youtu.be/72SYLTG0l_8

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

■ 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: dB SPL offset tuning for FFT and Time Domain measurements to compensate for differences from professional equipment.

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

• Frequency Response Preview: WiFi TCP-based acoustic frequency response measurement (requires FNam Frequency Noise Generator).

• Octave Band View Mode: Visualizes frequency levels as octave band bars for easier band-by-band analysis.

■ 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.