RoomScope 2.1 validates reverberation time measurements

In version 2.1, RoomScope now presents a nonlinearity parameter to offer additional guidance on the validity of each acoustic decay parameter (T20, T30, T60, EDT). Values of greater than 10 ‰ (per mille, or parts per thousand) indicate that the estimated reverberation or decay time may be suspect, or that integration limits may need to be adjusted manually to obtain a more accurate result.

RoomScope 2.1 is now available for download on the App Store.

RoomScope Screenshot iPhone 5

Download RoomScope 2.1

Electroacoustics Toolbox 3.5 adds AppleScript support for room acoustics

Version 3.5 of Electroacoustics Toolbox extends AppleScript support to the Room Analyzer tool (sold separately), which enables automated room acoustics analysis and data retrieval via AppleScript. Now, in addition to automating the acquisition of impulse response data, users can employ AppleScript to control the analysis of that data to extract relevant room acoustics parameters.

With increased automation capabilities, the Room Analyzer tool also now takes additional steps to verify the accuracy of acoustic decay time estimates, including T20, T30, T60, and EDT. For each of these parameters a nonlinearity value (in per mille, or parts per thousand) indicates how close the acoustic decay approaches a straight line, which is the basic assumption in reverberation time estimation. A nonlinearity value greater than 10 suggests that the user might want to take a closer look at the data to determine whether adjustments must be made to the integration limits for the decay curve to get a more accurate measurement.

Version 3.5 also addresses some issues, which include the following:

- Room acoustics parameters are properly plotted across 1/3-octave bands in the Room Analyzer tool.

- Radio buttons are properly deselected in the IR source drawer of the Room Analyzer tool when switching between Dual FFT or Oscilloscope measurements.

- A bug has been addressed that could prevent the “Try” buttons in the project window from successfully opening a trial of the Noise Dosimeter or Room Analyzer tool.


Download Electroacoustics Toolbox 3.5 from the Mac App Store.

Download a free trial of Electroacoustics Toolbox 3.5 from



SoundMeter 4.1 offers percentile-exceeded sound levels

SoundMeter 4.1, which is now available for download on the App Store, offers percentile-exceeded sound levels (Lx) via in-app purchase.

With the new upgrade, SoundMeter can display L10, L50, L90, or any percentile between 1 and 99. Percentile exceeded sound levels are also available in the Octave Analyzer tool (sold separately).

Also new in SoundMeter is the ability to set the meter to automatically stop after an arbitrary amount of elapsed time from 1 second to two weeks.

The Dosimeter and Octave Analyzer tools (sold separately) can also be set to automatically stop after a user-defined period of time.

Lx IAP Upgrade screenshot

Download SoundMeter 4.1



RoomScope Updated for iOS 7

RoomScope version 2.0 now fully supports iOS 7 with a refreshed look and feel that is consistent with recent updates to SignalScope Pro and IOScope. Although RoomScope still supports iOS 6, its appearance remains largely the same as before on the older iOS.

What’s new in RoomScope 2.0?

- RoomScope’s appearance has been completely revamped for iOS 7. RoomScope supports both iOS 6 and iOS 7, but looks largely the same on iOS 6 as the previous version.
- Audio data handling is more efficient.
- When entering a preferred sample rate, “48k” can be entered in the text box, as an alternative to typing out “48000.”
- Default input sensitivities have been updated, based on measurements of the iPhone 5S and 5C microphones and headset inputs. Nominal input sensitivities have also been updated for iPad Air and iPad mini with Retina display.
- Cursor info text now uses a larger font.
- 2Ch IR works properly when the internal excitation signal is selected for the X input and pan is set to 100%.
- A bug in the HTTP file server has been fixed.

RoomScope is a universal app designed for iPad, iPhone, and iPod touch.


RoomScope Screenshot iPhone 1

RoomScope Screenshot iPhone 2

RoomScope Screenshot iPhone 3

RoomScope Screenshot iPhone 4


Download RoomScope from the App Store.


iOS 7 Brings USB Audio Support to iPhone and iPod touch

I’m not sure how I missed it, but I discovered this week that USB audio devices can now be used with iPhones that support iOS 7 as well as the 5th generation iPod touch (I have personally confirmed that it works with iPhones as old as the iPhone 4S and the 5G iPod touch–iOS 7 is required in order for this to work). This is great news for anyone looking to perform multi-channel or high-quality audio or acoustic analysis with something smaller than an iPad.

The iPad has supported USB audio input and output, via the iPad Camera Connection Kit, from the beginning. Until the advent of iOS 7, however, this functionality was not supported on iPhone or iPod touch. Now, a whole host of devices, ranging from inexpensive stereo USB audio interfaces to higher end multichannel interfaces, can be used with the iPhone or iPod touch you carry in your pocket. Smaller, simpler USB interfaces will draw their power directly from the iOS device. More sophisticated hardware will require some kind of additional power supply. In any case, it is important to note that the USB audio interface must support the standard USB Audio Class driver (if it works with Core Audio on your Mac, without the need to install special drivers, then it should work with your iPhone).

In order to connect a USB audio interface to an iPhone, either the 30-pin USB adapter of the old iPad Camera Connection Kit or a Lightning to USB adapter is required (depending on whether your iPhone has a 30-pin or Lightning connector on the bottom). The screenshots below demonstrate success with a Behringer UFO-202 connected to a 5th generation iPod touch and a Tascam US-800 connected to an iPhone 5S. The UFO-202 runs completely off of power from the iPod (or iPhone), so it is a completely portable solution. The US-800 requires external power.



Measuring the inexpensive, bus-powered Behringer UFO-202 with SignalScope Pro running on the 5th generation iPod touch.


Measuring the inexpensive, bus-powered Behringer UFO-202 with SignalScope Pro running on the 5th generation iPod touch.


Analyzing 6 input channels simultaneously with SignalScope Pro running on the iPhone 5S. The input device is a Tascam US-800 sampling at 96 kHz.


Analyzing 6 input channels simultaneously with SignalScope Pro running on the iPhone 5S. The input device is a Tascam US-800 sampling at 96 kHz.


If you have had any experience connecting USB audio devices to your iPhone or iPod, I would love to hear about it in the comments. What have you found that works? What doesn’t?


Download SignalScope Pro from the App Store.


Faber Mac Apps Updated

All Faber apps for Mac have been updated to make more efficient use of resources. -> read more …

SoundMeter and dB support new iPads

Nominal microphone sensitivities for the iPad Air and iPad mini with Retina display have been added to SoundMeter 4.0.1 and dB 3.0.1. -> read more …

SignalScope Pro and SignalScope for iOS updated for iPad Air and new iPad mini

SignalScope Pro 3.0.1 and SignalScope 4.0.1 for iOS include updated nominal input sensitivities for iPad Air and iPad mini with Retina display. -> read more …

Faber Mac Apps Updated for Mavericks

All Faber apps for Mac have been updated for Mac OS 10.9, Mavericks. -> read more …

IOScope 3.0 Updated for iOS 7

As in recent updates to SignalScope Pro and SoundMeter, IOScope’s appearance has been completely revamped for iOS 7. -> read more …