In the new version 3, SignalScope Pro’s appearance has been completely revamped for iOS 7. SignalScope Pro supports both iOS 6 and iOS 7, but looks largely the same on iOS 6 as the previous version.
Also new in version 3:
– Audio data handling is more efficient.
– Image overlays created in the Level Meter tool now use the full resolution of the original image (whether the image comes from the photo library or straight from the camera).
– For devices that support input gain adjustment on the built-in or headset microphone, the input gain is stored with data exported from the FFT, Octave, or Oscope tools.
– 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.
– Cursor info text now uses a larger font.
Download SignalScope Pro
SignalScope, SoundMeter, and dB have also received similar updates for iOS 7.
The Octave Analyzer tool for iOS performs real-time spectral analysis in whole or 1/3-octave frequency bands.
The Octave Analyzer tool is built into SignalScope Pro. It is also available in SignalScope and SoundMeter via in app purchase.
The Octave Analyzer can analyze up to two audio input channels simultaneously (this requires a two-channel input device).
The Octave Analyzer can be configured with several options that are common to overall sound level meters. These options include time weighted exponential average levels with fast, slow, and impulse response times as well as the equivalent level, which expresses an average signal level over the total measurement time. Flat, A, and C frequency weighting are also available.
The Octave frequency spectrum appears within a bar graph which can be adjusted in its vertical scale either manually or automatically. In addition to current levels within each frequency band, maximum or peak levels may also be displayed, depending on which level type is selected. A data cursor allows specific levels at specific frequencies to be identified. The entire graph can be saved either as an image in the iOS photo library, or as a high resolution PDF file within the app.
Additionally, in SignalScope Pro, Octave analyzer data may be exported to CSV, MAT, or tab-delimited text files. Data export is also possible in SignalScope and SoundMeter with the optional Data Acquisition Upgrade available via In-app Purchase.
In version 1.6, RoomScope’s Room Analyzer tool now estimates the optimal end point for the decay curve–that is, the point at which the acoustic decay meets the noise floor in the impulse response data. This allows the Room Analyzer to provide better reverberation time estimates without the need for the user to manually adjust the decay curve limits with the built-in cursors. Decay curve limits can still be set manually, as before.
Download RoomScope 1.6
In version 1.5, RoomScope’s Room Analyzer tool can now load impulse response data from csv, txt, and MAT files saved within the app. Any csv, txt, or MAT files which contain time domain data, and are created by Faber Acoustical’s other iOS apps are also supported. Data files created in other Faber apps, such as SignalScope Pro or IOScope, would need to be added to RoomScope via iTunes File Sharing.
RoomScope 1.5 is available for download on the App Store.
Current versions of SignalScope (3.6.2), SignalScope Pro (2.6.2), and IOScope (2.5) include advanced audio configuration options that support user selection of the audio sample rate. Using built-in iPhone and iPad audio hardware, this typically means that sample rates as low as 8 kHz can be selected. Since the iPad additionally supports external USB audio devices, via the iPad Camera Connection Kit or the Lightning to USB adapter, sample rates as high as 192 kHz can be made available with the right hardware. Which sample rates can be selected depends on values supported by the connected audio hardware.
Typical sample rates for the built-in microphone or headset input of current iOS devices include:
- 8 kHz
- 11025 Hz
- 12 kHz
- 16 kHz
- 22.05 kHz
- 24 kHz
- 32 kHz
- 44.1 kHz
- 48 kHz
It is possible to sample audio data at up to 192 kHz, with USB devices that support it, on iPad. One such device is the Echo 2 from Echo Digital Audio, which supports sample rates of:
- 44.1 kHz
- 48 kHz
- 88.2 kHz
- 96 kHz
- 176.4 kHz
- 192 kHz
SignalScope, SignalScope Pro, and IOScope are all available for download on the App Store.
Download SignalScope Pro
The Echo 2 is available from B&H Photo Video and from Amazon.
SignalScope 3.5 and SignalScope Pro 2.5 for iOS have arrived on the App Store with added support for input triggering in the FFT spectrum analyzer tool. Triggering support essentially matches that in the Oscope tool, including Auto, Normal, and Single-shot triggering modes, positive or negative slope triggering, and a user-definable input level threshold.
Also new in these apps is a 1 second per division time scale in the Oscope tool that enables up to 10 seconds of time data to be visible in the Oscope display.
SignalScope 3.5 and SignalScope Pro 2.5 are both available for download on the App Store.
Download SignalScope 3.5
Download SignalScope Pro 2.5
A common request for RoomScope has been to directly capture room impulse response (IR) data using impulsive noise sources, such as balloons or starter pistols. RoomScope 1.3 now supports both single-channel and dual-channel IR data acquisition. The dual-channel capability has been built-in since version 1.0 of RoomScope, enabling the use of an omnidirectional loudspeaker and various excitation signals including broadband noise and frequency sweeps. The new single-channel IR acquisition tool can capture IR data directly by popping a balloon or firing a starter pistol within an acoustic space of interest. The input signal can be triggered in order to automatically begin data acquisition when the instantaneous input level crosses a user-defined threshold.
It should be noted that single channel analysis doesn’t mean that only one channel of data can be captured at one time. In fact, with an iPad and a multi-channel USB audio interface, it is possible to capture IR data from multiple microphones simultaneously (obviously, the mics and supporting cables, adapters, etc, would also be needed). Single channel analysis simply means that each input channel is treated independently from all other input channels. In contrast, dual-channel analysis means that a single measurement is based on data acquired from two input channels (using auto and cross-spectral analysis).
RoomScope 1.3 is now available for download on the App Store.
Download RoomScope 1.3
RoomScope 1.2 and IOScope 2.3 arrived in the iOS App Store this week. Both apps now support impulse response measurements up to 16 seconds long and use double precision (64-bit) FFTs in their measurements. The maximum measurement length is dependent on the amount of memory available on the device, so 16-second measurements are currently only supported on the iPhone 5, iPad 3, and iPad 4. The previous generation of devices, including the iPod touch 5, supports 10-second measurements, and older devices are still limited to measurement durations of 5 seconds or less.
RoomScope 1.2 also offers the following additions:
- Center time has been added to the list of calculated acoustic parameters.
- All parameters are now calculated in low, mid, and high frequency bands, as defined by the ISO 3382 standard.
- The calculation of the clarity and definition parameters (C and D) compensates for the delay of the whole and 1/3-octave band filters, as described in ISO 3382.
- Raw IR data can now be excluded or included in CSV, MAT, and TXT file data exports.
RoomScope turns your iPad, iPhone, or iPod touch into a room acoustics measurement and analysis tool. With RoomScope, you can measure a room impulse response and then calculate reverberation time, early decay time, center time, clarity, and definition, as defined in the ISO 3382 standard. RoomScope also allows you to adjust the Schroeder decay curve integration limits with the touch of your finger and plot the calculated room parameters versus whole or 1/3-octave band center frequency.
Download RoomScope 1.2
IOScope brings true dual-channel transfer function and impulse response analysis to iOS. With IOScope, measure loudspeaker impedance, frequency response, and sensitivity. Measure a room impulse response. Tune a large sound reinforcement system, time-align a set of surround sound speakers, or optimize your home stereo. Determine the actual cutoff frequencies of your latest speaker crossover circuit, or teach your students the fundamentals of Fourier analysis of dynamic systems.
Measure frequency response magnitude and phase, coherence, and group delay. Time domain functions enable you to measure impulse response and auto/cross-correlation. IOScope includes a built-in signal generator for producing suitable excitation signals to analyze your system or device under test (DUT). See http://youtube.com/faberast for a video demo of loudspeaker impedance measurement.
Download IOScope 2.3
SoundMeter 3.3 offers users the option to add a noise dosimeter tool via in-app purchase. The new Dosimeter tool enables you to measure noise dose–the percentage of a maximum permissible daily noise exposure based on an 8-hour time period. The Dosimeter supports criterion levels of 80, 85 and 90 dB, exchange rates of 3, 4 and 5 dB, and thresholds of 40 to 80 dB. The new tool also displays the 8-hour time-weighted average sound level (TWA), as specified by OSHA.
As with other measurements in SoundMeter, the Dosimeter’s accuracy depends on the quality of the microphone used as well as the accuracy of the microphone’s sensitivity calibration within SoundMeter.
SoundMeter 3.3 also includes updated Help files, minor bug fixes, and stability improvements. SoundMeter 3.3 will also continue to run while the screen is locked, which is important for making long-duration measurements, such as noise dose, Leq, and TWA.
Download SoundMeter 3.3 on the App Store.
RoomScope version 1.1 for iOS is now available for download on the App Store. The new version offers the following improvements:
- RoomScope now employs a more sophisticated approach to determine the onset of the direct sound in the impulse response.
- All calculated room acoustics parameters for all frequency bands of the current filter bandwidth can be displayed simultaneously in a table.
- An option has been added to plot the regression line used in calculation of reverberation times.
- Cursor behavior is more robust.
- Minor bug fixes.
Screenshots of the new version are shown below.