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Beskrivelse
"Low Frequency Detector" is a new acoustic measurement tool for detecting the low frequency sound that is hard to hear in the normal situation.
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. 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. By depending on its frequency component and sound level, it is different the degree of influence on the human body and the noise sensation.
This app also allows you to examine the frequency component of the 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): A 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 sound.
- 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 (1kHz sine wave), 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 boot.
Hva er nytt i denne versjon? (6.0)
- Improved internal processing and performance.
- Requires iOS16.6 or later.
Selger
Navn
TOON,LLC
Informasjon
Utvikler
Kategorier
Versjon
6.0
Størrelse
0,7 MB
Game Center
Nei
VPP Device Licensing
Ja
Vurdering
Aldersgrense: 4+
Kompatibilitet
iOS 16.6 eller senere
Enheter
iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XR, iPhone XS, iPhone XS Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone SE (2. generasjon), iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 12 mini, iPhone 13, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 13 mini, iPhone SE (3. generasjon), iPhone 14, iPhone 14 Plus, iPhone 14 Pro, iPhone 14 Pro Max, iPhone 15, iPhone 15 Plus, iPhone 15 Pro, iPhone 15 Pro Max, iPad (femte generasjon) Wi-Fi, iPad (femte generasjon) Wi-Fi + Cellular, iPad (6. generasjon) Wi-Fi, iPad (6. generasjon) Wi-Fi + Cellular, iPad Pro, iPad Pro (Cellular), iPad Pro (9,7-tommers), iPad Pro (9,7-tommers) (Cellular), 12,9-tommers iPad Pro (2. generasjon), 12,9-tommers iPad Pro (2. generasjon) Wi-Fi + Cellular, iPad Pro (10,5-tommer), iPad Pro (10,5-tommer) Wi-Fi + Cellular, iPad Pro (11-tommer), iPad Pro (11-tommer) Wi-Fi + Cellular, 12,9-tommers iPad Pro (3. generasjon), 12,9-tommers iPad Pro (3. generasjon) Wi-Fi + Cellular, iPad Air, iPad Air (Cellular), iPad Air 2, iPad Air 2 (Cellular), iPad Air (tredje generasjon), iPad Air (tredje generasjon) Wi-Fi + Cellular, iPad mini Retina, iPad mini Retina (Cellular), iPad mini 3, iPad mini 3 (Cellular), iPad mini 4, iPad mini 4 (Cellular), iPad mini (femte generasjon), iPad mini (femte generasjon) Wi-Fi + Cellular, iPad (7. generasjon) Wi-Fi + Cellular, iPad Pro (11-tommers, 2. generasjon), iPad Pro (11-tommers, 2. generasjon) Wi-Fi + Cellular, iPad Pro (12,9-tommers, 4. generasjon), iPad Pro (12,9-tommers, 4. generasjon) Wi-Fi + Cellular, iPad Air (fjerde generasjon) (Wi-Fi), iPad Air (fjerde generasjon) (Wi-Fi + Cellular), iPad (8. generasjon) Wi-Fi, iPad (8. generasjon) Wi-Fi + Cellular, iPad Pro (11-tommers, 3. generasjon), iPad Pro (11-tommers, 3. generasjon) Wi-Fi + Cellular, iPad Pro (12,9-tommers, femte generasjon), iPad Pro (12,9-tommers, femte generasjon) Wi-Fi + Cellular, iPad (9. generasjon), iPad (9. generasjon) Wi-Fi + Cellular, iPad mini (6. generasjon), iPad mini (6. generasjon) Wi-Fi + Cellular, iPad Air (5. generasjon), iPad Air (5. generasjon) Wi-Fi + Cellular, iPad Pro (11-tommers, 4. generasjon), iPad Pro (11-tommers, 4. generasjon) Wi-Fi + Cellular, 12,9-tommers iPad Pro (6. generasjon), 12,9-tommers iPad Pro (6. generasjon) Wi-Fi + Cellular, iPad (10. generasjon), iPad (10. generasjon) Wi-Fi + Cellular, iPod touch (sjette generasjon), iPod touch (7. generasjon)
Språk
engelsk
App Store: Poeng
Vurderinger og omtaler
0,0 av 5 (Ingen vurdering)
App Store: Omtaler
Ingen oppføring