benfaber
benfaber
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Typically, the built-in mic gets routed to both channels of input. From SignalScope's perspective, then, the built-in audio device appears to have 2 discrete channels when the built-in mic is selected, but the signals are the same. You should just make the change within SignalScope. Is this when you have two mics connected…
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Selecting output channels for analysis in Electroacoustics Toolbox only allows you to see signals that are generated within the program, itself. In order to view signals from other applications, you may want to take a look at the tutorials regarding Soundflower and Jack. The tutorials refer to SignalScope, but the approach…
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In order to help troubleshoot the problem, it would help to know exactly what model of Mac you are using, which version of OS X is running, and exactly what hardware you have connected to the line input (and how it is connected). Ben
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Eugene, There is no known problem with audio input selection in SignalScope. What external source are you trying to select?
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What it sounds like is that your head unit produces a higher output voltage than your Mbox can handle. That's a bit surprising, though, since Digidesign claims the Mbox 2 will handle up to 8.7 Vrms on the input! Perhaps you need to turn down the input gain or use the pad on the Mbox. Do you have any specs (or measurements)…
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The 0 dBFS tone is being generated by what device? So, in SignalScope, you tweaked the user-defined full-scale voltage until the oscilloscope indicated a level of 0.73 Vrms on the appropriate input channel. What full-scale voltage did you settle on? Getting the same reading suggests that you could be clipping on the input…
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The Mobilepre USB from M-Audio is certainly one of the least expensive options for getting a signal from a condensor microphone (via phantom power) into your Mac. You'll just want to be sure the specs are satisfactory for your particular application. The Mobilepre samples analog input signals with 16-bit precision at…
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I forgot to mention that using different data window types can also affect the amount of spectral leakage, which may also clear up some of the unwanted noise. I would recommend trying a Hann (hanning) or Rife-Vincent window. Ben
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noviski, SignalScope/Pro does not have any built-in option to sum the two input signals, although this could be accomplished with a separate hardware or software mixer (like Apple's free, but excellent, AU Lab). We'll certainly consider adding a summation option to a future version. Ben
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Bob, If you click on the Scale tab, you will see the Ceiling and Floor controls. If you increase the floor, you should be able to eliminate a lot of the low-lovel noise in the spectrogram image. Ben
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Generally, when making acoustical measurements, or when equalizing an audio system, using an omnidirectional microphone is the best approach. Directional microphones exhibit different frequency responses, depending on which direction the sound is coming from when it arrives at the microphone. Therefore, the orientation can…
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The problem isn't just the frequency response of the built-in microphone on a Powerbook--it's also that the presence of the Powerbook affects the sound field near the microphone, further degrading the measurement. Using a dedicated measurement microphone for equalization is highly recommended. The need for microphone…
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SignalScope and SignalScope Pro require audio hardware to be used for input signals, but you don't necessarily have to use mic preamps. If you want to probe an electric circuit, you will want audio inputs with a high impedance to minimize the effect that your input hardware has on the signals you are trying to measure. You…
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Danny, A and C frequency weightings are designed to mimic human perception of sound levels. They are generally used for measuring overall SPL's, but can be useful for seeing how the frequency content of an acoustic signal is affected by human perception. Generally speaking, A weighting is more appropriate for low sound…
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Broadcasting pink noise through your car stereo system is certainly one way to start getting a "look" at what how your system sounds. If you do that, you will want a microphone with a reasonably flat frequency response and an RTA that can display a spectrum in octave or third-octave bands, like SignalScope Pro. Pink noise…
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The onscreen drawing in SignalScope Pro accounts for the significant CPU use of the program. We are working on a more advanced analyzer that utilizes OpenGL for hardware-accelerated onscreen drawing that should significantly reduce the CPU load. It's not official, yet, but a limited version of the new software may…
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Currently, we don't have any compiled tutorial information on making room measurements, although we hope to add some of that type of material to the website in the future. We are also working on some new software that will make room measurements much easier to perform. Here are some basic tips. You want to use a test…
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Pete, For an inexpensive external interface that supports 24 bit, 192 kHz sampling, you might want to check out the Edirol FA-66. It offeres a FireWire interface (and can be bus powered so you don't need to use an external power adapter) and up to 4 channels of analog I/O in a small package. My only complaint with the…
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Pete, Once registered with a valid serial number, SignalScope will indeed create an ascii text file containing data from the current measurement. The text file can then be opened in another program, such as a spreadsheet or numerical analysis application, for further processing or plotting. Ben
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Greg, SignalScope (and Pro) currently support audio input devices only. Offering compatibility with non-audio instrumentation would require Mac OS X compatible drivers, which are generally not developed by the hardware manufacturers. National Instruments does offer Mac compatible drivers for some of their hardware products…
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Dan, I'm not clear about what you mean. In case this is what you're asking, SignalScope Pro does not route its inputs back to the audio output device. However, you might want to take a look at <a href="http://faberacoustical.com/forum/index.php/topic,5.0.html">Sending signals directly to SignalScope with Jack OS X</a> in…
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Yes, you will be able to activate the products in both locations.
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As long as you have Digidesign's Core Audio driver installed, the Digi 001 should work. SignalScope has been tested with the Digi 002 and that works fine.