Frequency Generator & Analyzer vs House ECG

Turn your iPhone into a professional-grade acoustic laboratory. Powered by the high-fidelity YIN pitch detection algorithm, Frequency Counter delivers instant, real-time audio frequency analysis and tone synthesis with uncompromising engineering precision. Whether you are testing audio equipment, analyzing ambient sound waves, tuning musical instruments, or calculating motor RPM, this app provides the advanced tools you need in a clean, high-contrast visual dashboard. KEY FEATURES 1. REAL-TIME AUDIO ANALYSIS & SPECTROGRAPH High-Fidelity Pitch Detection: Track real-time sound frequencies instantly with exact readouts in Hertz (Hz). Live Oscilloscope Grid: Visualize active sound waves on a sweeping, highly responsive neon coordinate grid. Signal Gain Adjuster: Amplify low-amplitude ambient sounds easily by adjusting the visual height of the oscilloscope lines. Music Note Translator: Automatically convert active frequency measurements to the closest corresponding musical note (based on standard A4 = 440 Hz tuning). 2. ADVANCED STATS & ANALYTICS (PRO) Live Session Tracker: Monitor Minimum, Maximum, and Average frequencies detected during your active scanning session. Integrated Decibel Meter: View current volume levels (dB) directly alongside your frequency readout. RPM Speed Calculator: Measure the speeds of rotating fans, propellers, or motors with a configurable blade multiplier (1 to 8 blades). 3. PRECISION SCAN CONTROLS Freeze Screen: Freeze the active frequency readout and grid at any moment to inspect specific sound intervals. Reset Peak Meter: Instantly clear out the highest recorded peak frequency with a single tap. Start/Stop Engine: Complete control over your microphone input scanning sessions. 4. PROCEDURAL SOUND WAVE GENERATOR (PRO) Real-Time Sound Synthesis: Generate continuous tones supporting four reference waveforms: Sine (Cyan), Square (Green), Sawtooth (Orange), and Triangle (Purple). Tactile Tuning Pad: Fine-tune your output with incremental coarse buttons (-100, -10, -1, +1, +10, +100 Hz). Interactive Sweepers: Seamlessly navigate the human hearing spectrum (20 Hz - 20 kHz) using linear volume and logarithmic sweep sliders. Direct Hz Keyboard: Double-tap the main Hertz indicator to type your exact desired frequency via a dedicated number pad. GO PRO WITH FREQUENCY COUNTER PREMIUM Unlock the full analytical power of your device. Premium subscriptions remove all session limits and unlock: Unlimited scanning sessions and freeze-frame analysis. Full access to the Procedural Sound Wave Generator. Complete Stats Dashboard (Min/Max/Avg Tracker, dB Meter, and RPM Calculator). Choose from our flexible Premium plans: Weekly, Monthly, or Yearly subscriptions. Note: Microphone access is strictly required for real-time frequency analysis. All audio processing is performed locally on your device; your data remains completely private. Choose Your Plan Unlock the full analytical power of Frequency Counter. Get unlimited scanning sessions, full access to the advanced sound wave generator, and real-time tracking tools. Weekly Access — $1.99 / week (Most Popular) Monthly Pass — $4.99 / month Annual Saver — $29.99 / year (Best Value) Cancel anytime in your App Store account settings. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Terms of Service : https://sites.google.com/view/freqmeterterms/home Privacy Policy : https://sites.google.com/view/freqcounterpolicy/home

Every building has its own vibration rhythm. House ECG uses the motion sensors in a dedicated iPhone to observe that rhythm over time—much like a long-term ECG for a house. Mount an iPhone 8 or newer at a fixed structural point, connect continuous power, place the screen face up, and keep House ECG open in the foreground. The app measures motion 50 times per second, establishes an initial reading for that exact installation point, and compares later stable observations with the same point. House ECG includes: - Three-direction vibration measurement, with north–south and east–west directions shown only when the phone's direction reading is reliable. - Welch spectral averaging with Hann windows and 50% overlap to reduce the influence of incidental bumps and noise. - A low-cost continuous watcher that performs fuller analysis only after a candidate vibration is detected. - Local candidate-event history and user labels for earthquake-like events, traffic, machinery, impact, device movement, or unknown events. - On-device SQLite storage for initial readings, history, and raw candidate-event waveforms. - Optional Sign in with Apple for Email notifications; basic monitoring does not require an account. - Optional comparison with the public USGS global earthquake catalog, approximate address, and weather context when an Email notification is requested. - Clear installation guidance and automatic reminders to create a new initial reading after moving, lifting, remounting, rotating, or changing floors. House ECG was conceived by a Taiwan-licensed civil engineer and National Taiwan University graduate who has participated in earthquake-related work since the 1999 Chi-Chi earthquake. The method is grounded in established vibration-analysis practice and is being improved through long-term field testing. Important: House ECG is a change-screening and field-observation tool. It is not a certified seismometer, earthquake early-warning system, structural safety certificate, or substitute for an inspection by a qualified professional. It does not declare a building safe or unsafe.