The Faber app updates released this week address the issue with the built-in iPad microphone input gain. In short, with the release of iOS 9.3.1, Apple chose to change the input gain range for the built-in microphone on iPad, which meant that apps such as SoundMeter needed to either adjust input gain or input sensitivity in order to continue to allow for reasonably accurate sound level measurements. Unfortunately, iOS versions 9.3.1 through 9.3.4 contain a bug that causes the previous input gain range to be applied after a microphone is connected to the headset jack and then removed.
The following Faber apps have been updated with a built-in workaround to properly apply the appropriate input gain on each version of iOS:
SoundMeter 8.3 and SoundMeter Pro 4.3 can now log sound levels at user-defined intervals for an arbitrarily long period of time. Each includes a new option to automatically export logged measurement data when the measurement duration is reached. If Auto Stop is disabled, SoundMeter will continue to save the current logged data to a new data file each time the duration is reached. This new Auto Save option has been added to both the Meter and Octave tools.
Data logs can be automatically saved to CSV, TXT, or MAT files.
Also new in SoundMeter:
When logging, Leq, Lp_max, and peak sound levels can be reset each time they are logged. With this option, it is possible to log a short Leq of 0.1 seconds for up to 8 hours. With the new Auto Save feature, the logging can be extended indefinitely.
When logging Lx values in the Meter tool, the user-defined percentile value will be fixed at the time logging starts. It is still possible to view different user-defined percentile values in the live meter display while the fixed percentile values are being logged.
A bug has been fixed which could cause errors in the Octave data when logging was enabled.
The formatting of the HTTP file server pages has been improved.
Audio input management has been improved to avoid the potential for transient noise from the hardware when a new measurement is started.
SoundMeter Pro uses much less memory when exporting data logs to CSV and TXT files.
The Octave log surface plot uses much less memory when viewing large data sets.
Other cosmetic enhancements and stability improvements.
In SoundMeter, the new features will require the purchase of one or more upgrades, which are available via in-app purchase. They are included in SoundMeter Pro.
SoundMeter 8.3 and SoundMeter Pro 4.3 are now available for download on the App Store.
Electroacoustic’s Toolbox 3.8.3 can now be downloaded from the Mac App Store and from FaberAcoustical.com.
New in version 3.8.3:
An issue with channel sensitivity adjustments in the Meter Bridge and Sound Level Meter tools has been addressed.
When loading Room Analyzer tools from a project file, if a permissions error occurs for an audio file being used for analysis, an Open dialog will be presented with the file in question selected. Once the file is then manually loaded via the dialog, the permissions will be properly set for the next time the project is loaded. This is an issue with sandboxed copies of Electroacoustics Toolbox downloaded from the Mac App Store.
The Room Analyzer tool’s plotting is more reliable when loading the tool from a project file on recent versions of Mac OS X.
SignalScope Pro for Mac has also been updated with the same improvement to the Meter Bridge and Level Meter tools.
SoundMeter 8.2 and SoundMeter Pro 4.2 are now available for download on the App Store. Each new version includes proper handling of the built-in microphone on iPhone 6S and iPhone 6S Plus devices and minor changes in iOS 9.
Unfortunately, the new iPhones do not support analog input gain selection for the built-in microphones as previous iPhone models did. The fixed input gain of the iPhone 6S/Plus matches the “Mid” input gain setting in the iPhone 5C, 5S, and 6 models. This means that the peak sound level that can be measured using the built-in microphone of the new iPhones is nominally 116.5 dB. Previous iPhones, on their lowest input gain setting, could measure nominal peak levels of 136 dB.
The SoundMeter apps now allow mixing audio with other apps. This means that it is possible to play music from the Music app while performing measurements with SoundMeter or SoundMeter Pro. It is also possible to mix the output of the signal generator with the audio output from another app.
Also new in each app, when using an iPhone or iPad that has multiple built-in microphones, the unique name of the selected microphone is displayed (e.g. “Bottom Microphone” or “Right Microphone”).
SignalScope Pro 6.1 and SignalScope 7.1 have been released for sale on the App Store with some important enhancements, including the ability to mix audio output with other apps. Audio mixing means that it is possible to play music from the Music app while performing signal analysis with SignalScope or SignalScope Pro. It is also possible to mix the output of the signal generator* with the audio output from another app.
The SignalScope apps include other important enhancements:
The FFT analyzer tool now supports frequency resolution as fine as 0.1 Hz for audio input signals.
When working with an iPhone or iPad that has multiple built-in microphones, the unique name of the selected microphone is displayed (e.g. “Bottom Microphone” or “Right
When analyzing two input channels in the Octave tool, both spectra are displayed in a single line plot.
For some time, SoundMeter has offered an optional in-app upgrade that would allow users to log sound level and noise dose measurements for up to two weeks. Version 8.1 adds an upgrade to allow whole and 1/3 octave sound levels to be logged for similar durations. The Octave Data Logging Upgrade will be made available within SoundMeter to users who have already purchased the Octave Analyzer Upgrade.
When Octave data logging is enabled, logged levels are displayed in a 2D color surface plot below the standard Octave spectrum graph. The color scale is defined by the vertical scale of the spectrum graph. A data cursor may be placed within the log plot to identify specific levels associated with date, time, and frequency band.
Octave data can be logged as often as every 0.1 seconds for up to 1 hour, every second for up to 10 hours, or every 10 seconds for up to two weeks. Larger intervals can also be specified in each case.
When data logging is enabled, logged levels will also be included when saving data to a CSV, TXT, or MAT
file. (Saving data in SoundMeter requires the Data Acquisition Upgrade, sold separately.)
SoundMeter Pro includes all the functionality of SoundMeter plus that of SoundMeter’s in-app upgrades. Current SoundMeter Pro users get the additional Octave data logging functionality for free.
Version 3.8.2 of Electroacoustics Toolbox for Mac OS is now available for download from FaberAcoustical.com and on the Mac App Store. This update corrects an issue that could prevent captured data from being successfully exported from the Dual FFT Analyzer tool using the Export All command.
Electroacoustics Toolbox is compatible with Mac OS version 10.7 or later.
Faber Acoustical is pleased to announce that a live Spectrogram tool is now available for purchase within SignalScope and SignalScope Pro. The Spectrogram tool is offered in both 2D and 3D versions. The 3D Spectrogram includes all the functionality of the 2D version and adds powerful hardware-accelerated 3D plotting capabilities including a live 3D surface plot. A 3D upgrade is available to those who opt to purchase the 2D version.
The real-time Spectrogram plots FFT-based spectral data versus time in a colorful surface plot. Signal magnitude at each time and frequency is represented by color. Use single-finger tap and drag to place a data cursor within the plot. When the cursor is visible, details regarding time, frequency, and magnitude will be displayed above the plot.
Main Features (available in both versions of the Spectrogram tool:
Frequency resolutions between 1 Hz and 50 Hz, depending on sample rate, may be specified for audio input (between 1 Hz and 10 Hz for the built-in accelerometer).
Input data can be windowed with one of 7 different FFT data window types.
Spectrogram data can be captured over time periods ranging from 2 to 20 seconds.
Lin, log, and dB magnitude scales with Up, Down, or Full auto-scaling.
Lin and log frequency scales.
Fractional-octave band frequency smoothing in 1/6, 1/12, and 1/24-octave bands.
Cursor peak track can track peaks in time, frequency, or both.
Color scale bar graph enables manual adjustment of magnitude scale and offset. The color scale can also be hidden.
Data may be exported to CVS, MAT, or TXT files for post processing or plotting. Optionally, include GPS location information with exported data. (The data export option is included in SignalScope Pro. It requires the Data Acquisition upgrade, sold separately, in the standard version of SignalScope.)
Optionally save a high-resolution PDF file of the spectrogram plot, or save an image to your Photos library.
3D Spectrogram Features:
Choose between 2D and 3D surface plots. Each plot can be drawn live (in real time).
Trackball-style 3D rotation of the 3D surface plot, just by dragging a single finger across the plot.
Tap with a single finger to place a cursor within the 3D plot.
In 3D, the cursor outlines the time and frequency slice associated with its current location.
Optional grid planes for each axis (magnitude vs. frequency, magnitude vs. time, and frequency vs. time) are drawn at the bounds of the 3D plotting region.
By default, the 3D spectrogram is drawn as a surface and magnitude values are represented by both position and color. The surface can be turned off, which allows data to be drawn only as a mesh.
The 3D spectrogram data can be seen as a solid-colored mesh (the mesh draws nothing between its lines or points). The mesh can be overlaid on the surface or drawn alone.
The mesh can be drawn as lines in time, lines in frequency, or lines across both time and frequency. It can alternatively be drawn as a series of dots, each one representing a single spectrogram data point.
When only viewing the 3D spectrogram data as a mesh, the time and frequency slices outlined by the cursor show through the mesh, making it very easy to see them in the midst of the rest of the data.
Also new in SignalScope and SignalScope Pro:
GPS coordinates, altitude, and accuracy may now optionally be saved with FFT, Spectrogram, or Oscope data when exporting to a data file (Data Acquisition Upgrade required in SignalScope).
Downloaded frequency response data for connected microphones will automatically be saved in a file in the Frequency_Response_Data folder to make it easier to access at a later time.
Smarter selection of the maximum frequency when FFT data smoothing is enabled.
Fixed an issue with Full Autoscale in the FFT analyzer.
SoundMeter 8.0 and SoundMeter Pro 4.0, which are both now available for download on the App Store, each include a companion app for Apple Watch. With the Watch app, you can monitor the current sound level, spectrum, and/or noise dose from your wrist (requires iOS 8.2 and iPhone 5 or later). These new versions of SoundMeter add other significant features, as well, including background sound level measurements and notifications of exceeded levels. The original sound level meter app for iPhone has now become the original sound level meter app for Apple Watch.
SoundMeter’s companion app for Apple Watch includes a separate screen for each of SoundMeter’s available tools running on the iPhone (new tools added to SoundMeter via in-app purchase are also supported in the companion app). Each tool can be started or stopped from the watch and current measurement values are updated on the watch display each second. The new notifications feature in SoundMeter allows the user to be notified on the Apple Watch when certain events occur. Notifications can be triggered when measurements stop (using the Auto-Stop feature) or when certain user-defined levels are exceeded. These notifications are supported in each of the Meter, Octave, and Dosimeter tools.
SoundMeter’s new ability to run in the background allows it to continue to run long-term measurements while other (non-audio) apps are in use. A complimentary new feature also allows the individual tools in SoundMeter to run independently. This means that users can run measurements in the Meter, Octave, and Dosimeter tools simultaneously. Users no longer need to worry about resetting the current measurement by switching to another tool (whether intentionally or accidentally). This makes SoundMeter more robust in terms of its ability to preserve acquired data until it can be saved more permanently in an image or data file.
Watch App Screenshots
The new versions of SoundMeter also include the following improvements:
Lx (percentile-exceeded sound level) measurements now use the same time and frequency weighting as the Lp measurement, instead of automatically switching to Fast and A weighting.
Frequency weighting may now be set to Flat, A, or C in the Dosimeter options menu (previously, the Dosimeter only allowed A weighting).
Meter, Octave, and Dosimeter tools now use local notifications to alert you when a measurement has finished or when selected levels have exceeded user-defined thresholds.
This release corrects a bug that could cause the device sensitivity for the built-in mic or the headset input to get corrupted when changing input gain selection with device units set to “FS.”
Octave and Dosimeter tools, Lx measurement and data file export capability are sold separately within SoundMeter via in-app purchase. These capabilities are all included with SoundMeter Pro.
This SoundMeter update will require you to restore your in-app purchases (you will not be charged again for upgrades you have already purchased).
Apple Watch compatibility requires iOS 8.2 and iPhone 5 or later.
Versions 3.8 of SignalScope, SignalScope Pro, and Electroacoustics Toolbox for Mac OS now offer built-in support for USB measurement microphones from miniDSP and Dayton Audio as well as the model 333D01 USB accelerometer from Digiducer.
Each app directly supports the miniDSP UMIK-1 and Dayton UMM-6 USB measurement microphones. Sensitivity calibration data for these mics can be downloaded automatically, just by entering the mic’s serial number. Making calibrated sound level measurements is as easy as plugging in the UMIK-1 or UMM-6, typing in its serial number, and getting started with the analysis tool of your choice (the serial number only needs to be entered once, after which the app will remember the microphone sensitivity). An internet connection is required to download sensitivity information for the microphone.
Each of these apps also directly supports the Digiducer 333D01 USB digital accelerometer, and can automatically load serial number and sensitivity calibration information directly from the device. Making calibrated acceleration measurements is as easy as plugging in the 333D01 and getting started with the analysis tool of your choice.
Various bugs and potential instabilities in each app have been corrected.
These apps all require Mac OS version 10.7 or later.