FNam FFT Spectrogram Analyzer vs NVH Lab

■ 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. Real-time FFT & Spectrogram / All processing runs on-device / No audio data uploaded externally. [Video Guide - See it in action] https://youtu.be/72SYLTG0l_8 ■ 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. ■ 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 'On My iPhone\FFT Analyzer' 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. • 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 frequency-weighting formulas for A/B/C weighting calculations. Note: This app implements IEC 61672 frequency-weighting 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.

Measure cabin noise, compare repeatable drive tests, and investigate tires, wind or rattles. NVH Lab keeps the route, speed, phone position and conditions with each result, so you can understand what changed and share a comparison others can read. Use it to establish a baseline, document a new hum, wind noise or rattle, and check whether a tire, road, or vehicle change altered the sound you experience. CAR NOISE METER — dB AND PERCEIVED LOUDNESS Record A-weighted cabin sound levels during a repeatable route. Save the test conditions so your next result is easier to compare. Alongside the level in dBA, NVH Lab computes perceived loudness in sones (ISO 532-1) — the part a dB figure alone cannot tell you, because two cabins can measure the same dBA and still sound noticeably different to sit in. FREQUENCY SPECTRUM See where sound energy appears across the frequency range. The spectrogram helps distinguish low-frequency rumble from mid-frequency hum and high-frequency hiss. NOISE DIAGNOSIS — WHY IS MY CAR LOUD? The guided diagnosis reads your recordings across speeds and road surfaces — with community data when available — and names the most likely cause: tire roar, wind and seals, engine or exhaust drone, or rattles. See the evidence, get fixes ranked by cost and effort, then prove the result with a before-and-after project. BEFORE-AND-AFTER TESTS Compare the same vehicle before and after new tires, insulation, maintenance, or a repair. Matched route, speed, phone position, and weather make the result more useful. GARAGE AND COMMUNITY Keep vehicle-specific recordings in your garage, follow model discussions, and contribute privacy-protected aggregate results when you choose to make a session public. Public feeds never expose recording coordinates. BUILT FOR REPEATABILITY NVH Lab flags clipped or unstable recordings and preserves test context. It is designed for relative comparisons with the same device, not as a replacement for a calibrated professional sound-level meter or a mechanical inspection. WHAT THE FLEET BOARD ADDS See how your car measures against other owners' Drive Tests, and how it compares with a car you are considering — using only tests taken in matching conditions, with the sample count shown. Results depend on the phone, microphone, placement, route, speed, and environment. Do not use the app to make safety-critical repair decisions. If a noise is sudden, severe, or accompanied by handling, braking, temperature, or warning-light changes, stop driving and seek qualified help.