benfaber
benfaber
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If I understand correctly, allowing one channel to act as a trigger for another would allow for what you are requesting. Of course, this would require the use of a dock connector device for stereo (2 channel) line input, and you would need to attenuate the trigger channel. That's a feature that might make it into…
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SignalScope Pro offers sophisticated options for monitoring live frequency response magnitudes. The new demo video shows some of what SignalScope Pro has to offer for frequency response equalization.
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More information regarding line level input is available here and here on the blog.
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Additional information regarding headset input is available here and here on the blog.
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Finnyous, I haven't measured the frequency response of the iVoice III, but I have measured the iVoice Pro, and it is not particularly flat. Take a look at a recent post on the blog. Ben
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Kent, If you plug a stereo cable into the headset jack, the selected output will be headphones and the selected input will be the built-in microphone. The headset input won't be selected unless you connect a suitable load to the input channel of the headset jack (which requires a four-conductor mini-plug). However, based…
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Neill, Currently, the Octave tool will measure and display grms in either whole or 1/3 octave bands. Alternatively, you can measure signal amplitude as a function of frequency in the FFT analyzer. In that case, you'll need to divide the magnitude by the square root of 2 to get rms at a particular frequency. This is correct…
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What exactly do you mean? Where would the signals go once they reached the USB cable? In other words, what are you hoping to accomplish?
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SoundMeter does not limit the range of sound levels it can measure. However, when working with the built-in mic, or a headset mic, the input signal will clip when the mic is exposed to peak sound levels as low as 105 dB, or 100 dB, respectively. Higher sound levels could be measured by connecting an external microphone to…
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The headset jack of the iPhone and 2G iPod touch provides the proper bias voltage for electret mic in compatible headsets, so you ought to be able to design your own mic that will work. There at least a couple of commercially available microphones that plug right into the headset jack. The bias voltage is around 2.7 VDC…
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Zoom analysis is not currently supported.
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Reducing your sample rate will enable finer frequency resolution. Ben
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super_rep, To measure impulse sound levels (that is, with a standard impulse time weighting), SoundMeter is the app you're looking for. For now, to save your readings from within SoundMeter, you can choose to capture an image of the sound level display, take a photo upon which the sound level will be overlaid, email the…
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Vern, FPPO implies FFT-based fractional octave band analysis, which we have no plans to develop. However, we do have a product in the works that will perform whole and third-octave band analysis with true digital Butterworth bandpass filters. Also, in the current versions of the iPhone OS, you cannot play files from the…
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kopimon, SignalScope will let you monitor signal levels in a couple different ways, so it could certainly help you to set your gains. The headset input requires a low input voltage, between 10 and 15 mV peak. That may still work for you, if you have appropriate external circuitry between your equipment and the iPhone OS…
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Hello! Thank you for your feedback. I certainly understand your concern and I am happy to report that data acquisition capabilities are planned for future products. Ben
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Ken, No updates with respect to roll mode, yet, but it's on the to-do list and we're definitely moving things forward. Thank you for your compliments! Ben
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I assume that you are using the built-in microphone on the iPhone 3G. In that case, the default mic sensitivity should get you within 1 or 2 dB of the actual sound level (unless the spectral content of the noise you are measuring has a lot of very low frequency energy, but in that case, the measured level would be biased…
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There is currently no means for the time scale to be automatically adjusted in the Waveform view. The smallest time scale available in SignalScope for iPhone is 0.1 ms/div. Ben
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In my experience, the signal source needs to be connected to whatever cable is being plugged into the headset jack. Sometimes, it seems to help to even have a live signal on the plug when it is plugged in. Otherwise, the iPod may not recognize that an input is available on the headset connector. It may still take one or…
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For some time, SignalScope has supported time scales up to 500ms/div, or 5 seconds total. In reality, twice the amount of visible data is captured. Sliding a single finger across the time axis label area will reveal additional data to the right or the left of the default display region. This can be handy for viewing events…
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You must be referring to SignalScope, rather than SignalSuite (which is an output-only app). Sometimes, you may need to plug/unplug the mini-plug a few times to get the iPod to recognize it. It's important to keep in mind that this requires the 2nd generation iPod touch, since the original iPod touch does not support input…
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Ben I'm guessing that you plan to use the built-in mic on your iPhone. Do you have an iPhone 3G, or an original model? If it's not an iPhone 3G, I would recommend using the headset microphone that came with it for more accurate measurements. To be conservative, I would recommend a flat frequency weighting. The time…
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Bob, What I can confirm is that you can use one of the previously mentioned input devices to get signals in through the dock connector. I don't know about connecting to the dock connector, directly, especially since the OS needs to recognize the availability of an audio input device in order to make the line inputs…
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Adjusting the time domain limits is possible with two-finger pinch/spread gestures inside the horizontal axis label area of the waveform display. Line-in has been available, via the dock connector, since version 2.2 of the iPhone OS. You'll need a third party device, like the Belkin TuneTalk or the Tunewear Stereo Sound…
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dB measures the time-exponential weighted sound level with no frequency weighting. If you're interested in different time and/or frequency weightings, check out SoundMeter.
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What exactly would you like to see? Since each channel is self-triggered, you can already see the trigger signal if you are using Auto triggering. For Normal or Single-shot triggering, would a simple bar-graph-style level meter be what you're looking for? Is the indicator in the toolbar (at the top of the screen)…
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Thanks, Steffan. It's coming... Ben
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Will you please explain exactly what happens? When things start behaving funny, you might want to start by rebooting your iPhone/iPod touch. You can force a reboot by holding down the sleep and home buttons for about 10 seconds. Often, this will solve the problem (this is true, regardless of what iPhone app you're having…
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faberJL, Yes, SoundMeter has been compatible with the iPod touch 2G for some time. Your best bet for a microphone would be to work with a standard iPhone headset, or one of Apple's new headphones with remote and mic (MA850 in-ear or MB770G). Ben