Spectroid is a real-time audio spectrum analyzer with reasonable frequency resolution across the the entire frequency spectrum. Set the hardware volume so that "Leq" graph bar fits from 40 to 60. The human ear is insensitive enough to become a low frequency. Audio Meter is a Tool for audio level measuring in dB or dB (A) with a wide range of advanced features build in. The frequency characteristic of the low frequency measurement is the flat characteristic. Compatible with iPhone, iPad and iPod touch. Audio Meter is freeware (no commercials, no in app purchases, FREE!) 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. This app is available only on the App Store for iPhone. Waves - Tuner. "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation… 2) Calibration: Determining the reference of the noise level of low frequency band. 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. Copyright 2020 AppAdvice LLC. FAQ Q: Why are the dB values negative? Be sure to set the measurement conditions in Step 1) and 2) once before starting the sound measurement analysis.1) Tuning: Reference signal adjustment. The human ear is insensitive enough to become a low frequency. Please note that this app has been deprecated in favor of gStrings, which has recently been rewritten... Sound Analyser PRO. "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 of neighboring constructions and factories without noticing, you may have a feeling bad and a sense of oppression. If you may be exposed to the noise … - 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. 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). - Leq (dB): Sound power level with the frequency weight characteristic Z (Flat) of the audible band.4) Measurement display: Measurement indication can select either 1/3 octave band frequency analysis, FFT analysis or Time course graph. 2) Calibration: Determining the reference of the noise level of low frequency band. Recommendation : Compatible with iPhone. - 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. "Low Frequency Detector" can also display the frequency component of the low frequency sound 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: Measurement analysis of low frequency sound is performed in the following step. By depending on its frequency component and sound level, it is different the degree of influence on the human body and the noise sensation. Set the hardware volume so that "Leq" graph bar fits from 40 to 60. 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. Copyright © 2020 Apple Inc. All rights reserved. It is effective when measuring for 10 seconds or more.# Time course graph : TIME- Low frequency (LF) Level (dB): Time course graph. The human ear is insensitive enough to become a low frequency. Optimized for iPhone, Compact code size. Low frequency sound detector Spectrum Analyser. 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. 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. (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 … "Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation.