Low Frequency Detector vs Blue Scan

"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.

Blue Scan – A Powerful Bluetooth Low Energy Scanner Blue Scan is a fast, practical tool for discovering and monitoring nearby Bluetooth Low Energy (BLE) devices. Whether you're a developer, hobbyist, or simply curious about the wireless devices around you, Blue Scan gives you a clear view of the BLE environment in real time. The app continuously scans for nearby BLE devices and presents them in an easy-to-read list. Each device shows important details such as signal strength (RSSI), estimated distance, and connection status. Devices update dynamically as signals change, so you can quickly see what’s nearby and how close it is. Blue Scan also includes a visual radar view that places devices around you based on signal strength, making it easy to identify which devices are closest and which are farther away. The radar interface provides a quick, intuitive way to understand the BLE landscape around you. To keep the display useful and uncluttered, Blue Scan includes several filtering options. You can hide iBeacons, filter out inactive devices, or remove unknown devices with no name. This helps you focus on the devices that matter most. Devices can also be sorted in multiple ways, including by signal strength or estimated distance, making it easy to track down a specific device or identify the strongest signals in your area. The interface is designed to be simple and efficient, showing key information at a glance without unnecessary complexity. The layout adapts naturally to light and dark mode and works well on both iPhone and iPad. Blue Scan is useful for: • Developers working with BLE peripherals • Troubleshooting Bluetooth connectivity • Finding lost or nearby devices • Exploring the wireless environment around you Whether you’re testing hardware, tracking signal strength, or just curious about what Bluetooth devices are nearby, Blue Scan gives you the tools to see what’s happening in the air around you.