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benfaber

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  • Data logging is coming within the next few weeks...
  • Richard, Are you referring to the tutorial on the blog (http://blog.faberacoustical.com/2013/mac/frequency-response-measurement-with-signalscope-pro-3-mac/)? If you follow the tutorial, you will have the sweep set to repeat. You will also have the sweep length configured to match the FFT. If either of these is not…
  • If you set the averaging type to Linear, the measurement will stop after the specified number of averages has been reached. I would recommend capturing the data after that. Your screenshots clearly indicate that you are not yet getting valid measurements within the DFFT Analyzer, so that issue needs to be resolved before…
  • gwarder, Did you select the same (excitation) output channel for the Reference input (next to the Source input selection)? If you have any other tools in your project, I would recommend just starting and stopping the DFFT Analyzer directly, rather than all tools simultaneously. Also, for room measurements, you might want…
  • SNR requires that one of the cursors be turned on. THD measurements require a cursor, plus at least 1 harmonic cursor.
  • H3nry, Version 3.4.2 addresses two issues that could potentially lead to excessive memory use. I would be interested to know if this version solves the issue you have been having. Ben
  • H3nry, How many input channels were you monitoring? Which input device were you using? Is this repeatable? Thanks, Ben
  • It turns out that the problem occurs when sandboxing is enabled for an app. Sandboxing is required for all app submissions to the Mac App Store, which is why this problem only affects the App Store version of the Toolbox. It would also seem that Tascam could solve the problem with their own drivers, since many other audio…
  • I have acquired a Tascam US-144mkII for testing and can confirm that it does not appear in the device list in Electroacoustics Toolbox. At least now, I can start digging for a real solution to this problem.
  • Tascam's last version of the Mac drivers for the US-800 is 1.0.9, which has not been updated specifically for 10.8 (Mountain Lion). Is it possible for you to uninstall version 2.10 for the US-1800 and install version 2.0 instead? Maybe it's a Tascam driver issue.
  • What are you referring to by "latest software (2.10)"? I'm still baffled by this. Do you have any other audio apps running when you launch Electroacoustics Toolbox?
  • H3nry, I'm sorry for leaving you hanging. I still haven't been able to reproduce the problem, and I have been working with USB and FireWire audio interfaces, including a Tascam US-800. Does it matter whether you use an admin or non-admin account? Does the problem persist with version 3.4 of the Toolbox? Also, are you…
  • What was the last version of the Toolbox that you know presented all your devices in the list?
  • H3nry, You are the second user to report this. I have never observed this issue on Mountain Lion, with either the App Store or non-App Store versions of Electroacoustics Toolbox. Did you download the Toolbox from the App Store? Are you aware of any security restrictions in place on your Macs that might affect the…
  • IOScope is a dual-channel analysis tool, which means that it uses two channels to capture a single IR. It is not presently equipped to capture more than one IR at a time. If you need to acquire multiple IR's simultaneously, you might be interested in Electroacoustics Toolbox for Mac OS, which can capture an arbitrary…
  • redbox, I'm sorry you're having a tough time. Have you read the calibration tutorials in the Help files (you can access them from the Help menu in the app)? There are tutorials for input and output voltage calibration, as well as microphone calibration. Ben
  • redbox, Have you also calibrated the voltage sensitivity of the audio input device your mic is connected to? If that voltage sensitivity isn't correct, then the acoustical measurement won't be correct, either. Ben
  • Jasonaudio, The high-pass filter is bypassed in our measurement apps as of iOS 6. You can learn more about this on the blog. Microphone sensitivity calibration is always recommended. However, if you don't have a microphone calibrator handy, it may be more convenient to perform a voltage calibration and then manually enter…
  • I'm sorry SignalScope Pro crashed. Will you please provide additional details about when it crashed? Were you able to export the data to a file? How much data did you acquire? Since you mention rebooting without success, was the crash repeatable, or did the app fail to launch after the initial crash? Thanks, Ben
  • From your description, it appears that you are trying to capture data in the Oscope tool. You can adjust the time scale of the Oscope tool using a two-finger pinch/expand gesture within the time axis region of the plot (below the graph where the axis labels are). You can increase the time scale to as much as 500 ms per…
  • John, To see units other than FS and Pa, please ensure that you are working with an input source other than the built-in microphone. IOScope does not currently support arbitrary band limits on the built-in frequency sweep (i.e. it is a full bandwidth sweep). Ben
  • djslice, These features have not yet been implemented on iOS, but we do plan to offer them in the future. Ben
  • audioguy, Please check out this recent post on the blog: http://blog.faberacoustical.com/2012/ios/iphone/finally-ios-6-kills-the-filter-on-headset-and-mic-inputs/ An app has to select the appropriate audio settings in iOS to disable the filter, which our apps do. Ben
  • Joe, Since it sounds like your goal is to perform frequency response measurements, I would recommend that you take a look at IOScope, which is a true dual-channel analyzer. It offers frequency response magnitude and phase, group delay, coherence, impulse response and cross-correlation. With IOScope, you could solve your…
  • I have seen that sometimes, the difference channel (Ch2-Ch1) doesn't show up in the input channel list when using the hardware you mentioned (iPod touch 5, Mobile In, Lightning adapter). It should work however, if you restart the app and reconnect the Mobile In. I'm still not sure exactly what the issue is that causes this…
  • possum, It's not clear what you are hoping to see in a block diagram. Both channels of the headphone out and the microphone input all share the same common return path on the headset jack. High voltages are not recommended for the headset jack. Ben
  • Do you have any of the captured traces checked in the Captured Data Sources list? In the Display tab of the Controls drawer (at the bottom of the window), is the Draw column checked for the captured traces you are trying to display? Is the vertical scale selection appropriate for the data? In this case, a screenshot of the…
  • Zimbo, If you calibrate at 1 kHz, then you should easily be able to achieve accuracy within 0.1 dB at 1 kHz. You should be aware of the current high-pass filtering applied the iPhone's built-in microphone. This issue is discussed on our blog. If you need true class compliance, then you'll need a dedicated sound level meter…
  • SignalScope uses the main microphone, which is situated at the bottom of the iPhone 4. SignalScope cannot use both internal microphones at the same time.
  • Electroacoustics Toolbox does not support external microphone frequency response correction curves. However, since you have this data, you could use it to correct 1/3-octave measurements manually or export measurement data and correct it within a spreadsheet. Sensitivity calibration will still require that you use a…
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