benfaber
benfaber
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You can manually adjust the input sensitivity of the microphone input channel in the table at the bottom of the Device IO Setup window. If you have already performed a voltage calibration on your device, and you know the sensitivity of the microphone, you can just switch the units to Pa and enter the microphone…
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Dustin, We're looking into the text messaging interruption problem. What happens when you try to re-download SignalScope? If you are using the same iTunes account, it may appear that you are expected to purchase the app again, but when you proceed, iTunes should indicate that you have already purchased the item and ask you…
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David, On a log frequency scale, the lowest frequency label will depend on the current frequency resolution, which is a function of the number of spectral lines you have selected. Increasing the number of spectral lines will increase the frequency resolution (and decrease the update rate of the spectrum). You can change…
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medengineer, On the few iPhones I have measured, it appears that the headset mic input accommodates a sinusoid of nearly 10 mV rms. Anything above 14 or 15 mV will be clipped. You won't be able to analyze DC voltages with SignalScope, using the iPhone's headset input. Ben
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Longer time records are planned for a future version of SignalScope.
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In a nutshell, to calibrate SoundMeter, you'll need another sound level meter (SLM) that has already been calibrated. Then, I would recommend generating a 1 kHz tone in a very quiet place--the tone should be much louder than the background noise. Place the mics of the calibrated SLM and SoundMeter very close together and…
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Even though the "What's new" should be showing up in the iTunes/App Store description any time, it might as well be published here. What's new in SoundMeter 1.1?[li]An option has been added to restore the default microphone sensitivity.[/li][li]Changing the frequency weighting causes the current measurement to be…
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You don't have to calibrate SoundMeter to make measurements. If you don't calibrate, your measurement error will probably be less than 3dB, but it might be higher (~6dB, or greater). There's no way for us to guarantee a certain level of accuracy. If you want to make more accurate measurements, calibration is recommended.
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SoundMeter should measure sound levels up to approximately 105 dB (peak), using the iPhone 3G's built-in microphone. Anything above that level may not be measured accurately. Default sensitivity values should place the measurements within about 3 dB of what would be measured by a precision sound level meter, although the…
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Are you looking for formant frequency estimation?
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There's nothing to announce yet. What range of window lengths would you be looking for?
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Currently, there is no officially supported means for getting line-level signals into the iPhone, via the dock connector. We are keeping an eye on it, though.
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Eddie, The waveform and spectrum analyzers operate independently, so viewing the spectrum of a triggered waveform isn't possible. Ben
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Glenn, Thank you for your compliments. We do plan to add a reference section to the SignalScope Help. What would you like to accomplish with triggering? You may want to look at this post. We do plan to make this easier. Ben
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TMS, Thank you for your compliments and for your feedback. You're right. At the very least, Leq should be reset when the frequency weighting changes. I suppose in that case, it would make sense to warn the user about the reset and prompt them to proceed or cancel the action. Electroacoustics Toolbox, for the Mac, supports…
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I can't say when, but I do suggest that you subscribe to the mailing lists to be notified of product updates and new product announcements (if you haven't already done so). Ben
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Matt, Thank you for your feedback. We'll take your suggestions into consideration. Ben
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Thanks for the feedback, Bill. Programming by users? What do have in mind? Ben
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Thanks for the feedback, Elliott. You don't need to use the scroll bars at all. You zoom in/out and or pan around the zoomed plot with two-finger gestures. The space occupied by the scroll bars was unoccupied before there were scroll bars (to accommodate axis labels), so the scroll bars are a bonus, even if they are a bit…
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Yep.
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Steve, Frequency weighting is disabled when using the built-in microphone on the original iPhone. In general, it is recommended to use the iPhone's included headset mic, when working with first generation iPhones. The built-in microphone of the iPhone 3G works quite well, however. Ben
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The default sensitivity values for SoundMeter are: Built-in Mic: 3.85 Pa/FS Headset Mic: 2.05 Pa/FS You can also uninstall and reinstall the app to reset to default values.
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chad, If you don't have access to a calibrated meter with which to calibrate SoundMeter, your best bet may be to just use the default sensitivity. If you want to use a third-party headset mic, you'll want to be sure it has a reasonably flat frequency response and find some way to calibrate it. Ben
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dsd, With a 1st generation iPhone, your best bet, for now, is to use the headset mic that came with it. When you plug that in, SoundMeter will use a default sensitivity that should get you pretty close to the mic's actual sensitivity. Another option would be to make your own little mic, using an electret condenser…
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There is not yet a direct way to measure RT60 in Electroacoustics Toolbox. For now, you would need to export the impulse response and use some other software package to compute RT60 for you. Ben
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Tom, I recommend uninstalling SignalScope from your iPhone and re-installing it. To uninstall, hold your finger on the SignalScope icon, on the iPhone home screen, until it begins to wiggle. Then, tap the X in the upper left-hand corner of the icon, and confirm that you want to delete the app. If you downloaded it through…
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Steve, Yes, 1/3-octave display is on the (rapidly-growing) to-do list. I'm not sure how soon it will make an appearance. Ben
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Bruce, Thank you for your compliments. The iPhone currently prevents more than one third party app from running at a time, so SignalSuite has to quit in order for SignalScope to run. We are planning for other applications that will add additional measurement capabilities to the iPhone. Regarding a spectrogram in…
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Brian, SignalScope could be run on the iPod touch, although in that case it would be of more limited value to many. Hopefully, we'll see audio input hardware officially supported on the iPhone before too long. SignalScope does not yet have any data acquisition/logging capability beyond saving data plot images to the user's…
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When it comes to protecting your hearing, a high quality calibrated measurement mic would be most valuable for sound level measurements. However, if you're just looking to get in the ballpark of the actual sound level, we could look at providing an iPhone app that just relies on the built-in or headset mic. Ben