Low Frequency Detector vs Morse Now

"Low Frequency Detector" is an acoustic measurement tool for detecting low-frequency sounds that is hard to hear in normal situation. The human ear is not sensitive enough to low-frequency sounds. If you are exposed to noise from nearby construction or factories without realizing it, you may feel discomfort or a sense of pressure. In such cases, you can use this app to check what kind of low-frequency noise is present. Generally, low-frequency sounds is a sound wave ranging from 1Hz to 100Hz. Depending on its frequency component and sound level, the degree of influence on the human body and the noise sensation is different. This app allows you to examine the frequency component of low-frequency sounds by 1/3 octave band analysis and FFT analysis. Features: - Low-frequency power level measurement less than 100Hz (LF Level): Flat characteristic, Updating indication of measurement period 1 sec. - Power level measurement in the audible band (Leq): Flat characteristic, Updating indication of measurement period 200ms. - 1/3 octave band analysis (OCT) - FFT analysis (FFT) - Time course graph (TIME) - Snapshot (Snap) on the measurement display screen. - Report function (Report): Analysis report of a peak LF Level with TIME, OCT and FFT. - Measurement time: up to 60 sec Functions: The measurement analysis is performed in the following step. Be sure to set the measurement conditions in Step-1 once before starting the sound measurement. 1) Calibration (Calibrate): The reference signal (1kHz sine wave) is output to determine the reference noise level for the low-frequency component. If the volume level of iPhone is set to about 20-50%, the calibration will automatically adjust it to the optimum volume level for the reference signal. 2) Measurement (Measure): Analyze a power level of low-frequency sounds. - LF Level (dB): Low-frequency power level less than 100Hz. - Leq (dB): Sound power level with the frequency weight characteristic Z (Flat) of the audible band. 3) Measurement display: It can select either 1/3 octave band frequency analysis, FFT analysis or Time course graph. They are updated in real time. 4) Report: Measurement result report. It is effective when measuring for 10 seconds or more. # Time course graph: TIME - Low-frequency (LF) Level (dB): Time course graph with peak level noise level judgment (RED-very noisy, YELLOW-noisy, GREEN-normal) at the peak level. - LF max (dB): maximum dB value of low frequency. # Frequency response graph: OCT, FFT - OCT Band LF max (dB): maximum dB value in 1/3 octave band at LF max observation. - Max Level Frequency (Hz): peak frequency at LF max observation. Notes: - The sound measurement of the low-frequency range is a level difference with respect to the reference signal, which indicates the relative power level. - The reference signal is output during calibration and sound level measurement. - Do not change the volume level of iPhone after the calibration. - White line in the OCT and FFT modes indicates frequency characteristics in frequency weight correction of G characteristics. - Since iPhone's built-in microphone has a lower sensitivity on the very low frequency range, it is not recommended to measure a huge volume sound near a very loud noise source. - Since it takes a while for the observation value to stabilize immediately after the start of measurement, the maximum value is calculated from about 2 seconds later. - In the case high power of 1kHz component is included in the measured noise source, the precision of measured value by this app largely decreases. - Sudden noise or impulsive sounds are not low frequency noises in general. - The previous calibration information can be maintained internally. - The analysis results may vary due to individual differences in iPhone devices. - The authorization to access built-in microphone and Photos will be confirmed by iOS system at first access. Please visit our iOS app support page for more information.

Master Morse code with the most advanced, privacy-first translator on the App Store. Whether you're a ham radio operator, survival enthusiast, or curious learner—Morse Now delivers professional-grade tools without compromising your privacy. WORLD-CLASS AUDIO DECODER - Listen to Morse code via microphone in real-time - Upload audio files and decode them instantly - All processing happens on-device—no internet required - Perfect for ham radio enthusiasts and puzzle solvers ADVANCED TRANSMISSION TOOLS * Flashlight Mode - Send Morse using your camera LED * Haptic Mode - Transmit silently through vibrations * Audio Mode - Classic tone transmission * Image Generator - Create SVG visuals of dot/dash patterns ZERO DATA COLLECTION GUARANTEE Your privacy is non-negotiable. Morse Now collects absolutely nothing: - No tracking or analytics - No advertisements - No third-party SDKs - Works 100% offline - You're the customer, not the product COMPREHENSIVE LEARNING FEATURES - Instant two-way translation (text ↔ Morse) - Interactive Morse code reference chart - Support for special characters and punctuation - 6 languages: English, Turkish, French, German, Spanish, Italian - Clean, intuitive interface designed for learners PERFECT FOR - Ham radio operators and amateur radio enthusiasts - Emergency preparedness and survival training - Students learning communication systems - Puzzle and cipher enthusiasts - Privacy-conscious users seeking offline tools - Scout groups and educational programs PREMIUM EXPERIENCE This is a one-time purchase app—no subscriptions, no hidden costs. Pay once, own forever. When you pay for the app, you get: - All features unlocked immediately - Lifetime updates - No upsells or in-app purchases - Professional-grade tools MULTILINGUAL SUPPORT Seamlessly translate Morse code in 6 languages with full support for special characters unique to each language. Switch languages instantly within the app. WORKS ANYWHERE, ANYTIME No internet connection required. Whether you're in the wilderness, on a boat, or in an underground bunker—Morse Now works flawlessly offline. Your tool when it matters most. MODERN DESIGN Beautiful, intuitive interface that's both powerful and easy to use. Light and dark modes supported for comfortable viewing in any lighting condition. Download Morse Now today and join thousands of users who trust the most advanced, privacy-respecting Morse code tool on iOS.