Version : 3.0 Release date : June 19, 2020. If you may be exposed to the noise … The human ear is insensitive enough to become a low frequency. If you may be exposed to the noise of neighboring constructions and factories without noticing, you may have a feeling bad and a sense of oppression. The frequency characteristic of the low frequency measurement is the flat characteristic. "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation. Add to Wishlist InfraSound Detector is the App that allows you to detect infrasound (infrasonic) acoustic signals below the user-defined frequency (up to 30 Hz by default). This app is available only on the App Store for iPhone. Copyright 2020 AppAdvice LLC. By depending on its frequency component and sound level, it is different the degree of influence on the human body and the noise sensation. The human ear is insensitive enough to become a low frequency. Set the hardware volume so that "Leq" graph bar fits from 40 to 60. It also shows the 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:- Sound measurement of the low frequency range is a level difference with respect to the reference signal, which indicates the relative power value. Audio Meter is freeware (no commercials, no in app purchases, FREE!) If you may be exposed to the noise of neighboring constructions and factories without noticing, you may have a feeling bad and a sense of oppression. The human ear is insensitive enough to become a low frequency. - LF Level (dB): Low frequency power level less than 100Hz. 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: Measurement analysis of low frequency sound is performed in the following step. - Max Level Frequency (Hz): peak frequency at LF max observation.Notes:- Sound measurement of the low frequency range is a level difference with respect to the reference signal 1kHz, which indicates the relative power value. - LF Level (dB): Low frequency power level less than 100Hz. Be sure to set the measurement conditions in Step 1) and Step 2) once before starting the sound measurement analysis.1) Tuning: Reference signal adjustment. App Store Description. 3) Measure: Analyze low frequency sound level. "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation. If you may be exposed to the noise … ‎"Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation. Copyright © 2020 Apple Inc. All rights reserved. "Low Frequency Detector" can also display the frequency component of the low frequency sound by 1/3 octave band analysis and FFT analysis.In the latest version, the analysis report function is now available. In this case, you can check what type of low frequency noise exists by simple operation of this app.In general, the low frequency sound is a sound wave with 1 Hz to 100 Hz. These displays are updated in real time.5) Report: After the completion of the measurement, you can display the report of peak LF Level analysis. The frequency characteristic of the low frequency measurement is the flat characteristic.- The reference signal is output during calibration and level measurement.- 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. (Feel free to donate on our website if you like it) Audio Meter can: • Measure Sound in dB and dB (A) • Measure Sound Frequency • Record SPL dB and dB (A) • Save/Load Graphs • Export data to OneDrive • Record … The human ear is insensitive enough to become a low frequency. Low frequency sound detector Spectrum Analyser. Sound Meter is in the 4th set of the Smart Tools collection. Optimized for iPhone, Compact code size. Description - iOS app / Low Frequency Detector Products Information. - Sudden noise or impulsive sounds are not low frequency noises.- The previous calibration information can be maintained.- There are variations in analysis results due to individual differences of iPhone devices.- The authorization to access built-in microphone and Photos will be confirmed by iOS system at first boot. "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation… - 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. Requires iOS 12.4 or later. FAQ Q: Why are the dB values negative? A: Spectroid uses dBFS (Full Scale) where 0 dB is the maximum power that the microphone can measure, so the decibel values are negative because the measured power is less than the maximum power. - Changed UI design.- Requires iOS12.4 or later. Set the hardware volume so that "Leq" graph bar fits from 40 to 60. "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation. It also shows the 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. They are updated in real time.5) Report: After the measurement, you can see the report of peak LF Level analysis. Audio Meter is a Tool for audio level measuring in dB or dB (A) with a wide range of advanced features build in. Compatible with iPhone, iPad and iPod touch. Features. It is effective when measuring for 10 seconds or more.# Time course graph : TIME- Low frequency (LF) Level (dB): Time course graph. 2) Calibration: Determining the reference of the noise level of low frequency band. - Sudden noise or impulsive sounds are not low frequency noises.- The previous calibration information can be maintained.- There are variations in analysis results due to individual differences of iPhone devices.- The authorization to access built-in microphone and Photos will be confirmed by iOS system at first boot.