Recording using an external HD

Hi forum,
I want to know if the recording setup I will use will work in real life.
I shall be recording two tracks using Logic Pro from the MacBook Pro for approx 2 hours, and want to connect the laptop to an external HD using the USB 3.0 port. The format in which the audio will be recorded will be 2x .wav files at sample rate 48000.
Will the setup work or will the data transfer speed of the USB 3.0 crash the recording?
I hope I explained my intentions sufficiently enough, your time is greatly appreciated!
Simon

Like Chorleyman said it should be fine, although using a USB 3.0 hard drive on a macbook pro offers no advantage from using a USB 2.0 hard drive as macbook pro's are not yet equipt with USB 3. (unless you have done some upgrading of your own). You may run into trouble if the hard drive does not have enough space on it. Also be aware of bumping or moving the hard drive while recording, as the session may crash the recording if the hard drive is writing at full speed.

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Hello all
I'm scheduled to work with a friend this week; I'm going to help him make a simple audition DVD. I promised him I had the necessary equipment and such.
I was importing from the webcam using iMovie. If I can't use my external mic to record for the video, there is more involved in the editing process. I was hoping to record the video and audio into one package. I'm using the built-in FaceTime webcam on my macbook pro and a ZoomH1 on usb.
I've tried changing the audio in system preferences: input to H1. This works when recording with audacity or anything else. I even changed the input on FaceTime to H1. There aren't any preferences I can find in iMovie to change the input for importing video directly from the webcam.
How do I change the audio input for direct import on iMovie?
OR
Is there something else I can do to have HD video and HQ audio captured in one video file on my macbook pro?
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I just found using QuickTime Player to record a movie works great. I can easily change the audio input. iMovie is silly. lol
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I've been trying to find a way to use my external USB microphone (MXL 990 USB) when recording a movie into iMovie when in the Camera Import window. I have the option to use it when I go under the Voiceover menu, but I can't find anything in iMovie or System Preferences that lets me record from it (even when I change the Input in System Preferences to the USB mic) for regular movies. It always uses the built-in mic no matter what I try. How can I use the external mic??
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Ryan--
I've been having the same issue with the same USB mic and I got it to work today. Here's what did the trick:
In previous tries, I had been using the "front" USB port (of the two USB ports on the left side of my machine) on my MacBook unibody with OS X 10.6.1.
I simply tried switching the MXL 990 USB mic to the "back" USB port and the mic now works when I capture video in iMovie from my built-in camera and the MXL 990 mic.
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Multiple recording of waveforms using an external trigger signal

Dear all,
Maybe somebody could help me with the following:
System:
Windows 2000,Pentium III,~800-900MHz,32-bit master PCI bus,256 MB RAM
PCI-NI 5122 Digitizer
PCI-GPIB card
PCI-DAQ card
Labview 7.1
NI Scope 2.7
Problem:
I want to acquire multiple waveforms (e.g. 100) using an external TTL trigger signal of ~40Hz. I have to acquire 1 waveform per trigger signal i.e. 100 subsequent trigger signals will acquire 100 subsequent waveforms.
After, or during the waveform acquisition (?), I have to transfer the waveforms as 100 1D-arrays from the onboard memory of the digitizer through my fitting routine (one-by-one!). The fitting routine accepts one waveform (1D-array) at the time, fits the waveform and calculates 1 fit-value per waveform. So, when I pass the acquired 100 waveforms subsequently through the fitting routine, I need to get out a 1D-array with 100 fit-values. This 1D-array with the 100 fit values will be further processed and a final value will be saved.
This procedure will repeat itself at different points in a sequence structure. The sequence structure will be located in a loop and running for several hours!
Please see attached program flow diagram.
Qustions:
1. When I want to acquire 100 waveforms using 100 subsequent trigger pulses, the attached VI (Multiple_record VI) gives me the following error message:
ERROR
"Possible reason(s):
Driver Status: (Hex 0xBFFA4009)
A previous acquisition is still in progress. If you are attempting to change an attribute, note you can only change fetch attributes while an acquisition is still in progress.
Status Code: -1074118647
What am I doing wrong? Is there a better and more efficient way to do this?
2. How can I transfer the 100 waveforms from the digitizer, one-by-one as 1D-arrays, through my fitting routine? A waveform will have ~2000-3000 data pts. (DBL type). Remember: I DO NOT HAVE TO SAVE THE WAVEFORMS!
3. Which way is faster, and more efficient (memory) for my PC system to transfer the waveforms from the onboard memory of the digitizer to the fitting routine?:
a) Start transfer of already acquired waveforms (1D-arrays), one-by-one through the fitting routine, during the waveform acquisition process is still in progress?
b) First, acquire the 100 waveforms (1D-arrays), store them in the onboard memory (digitizer) and then transfer them one-by-one through the fitting routine?
4. How can I make sure that after the waveforms were transferred through the fitting routine, the onboard memory of the digitizer is EMPTY (clear waveforms which have already been fetched) and ready to repeat the waveform acquisition at a different point of the sequence structure?
5. I do not want to display each acquired waveform because I think it will slow down the acquisition process. Instead, I want to display the last of the acquired 100 waveforms, so I can check my fit and maybe adjust the fit-parameters. How can I do that?
I think the important thing is to perform this process in the fastest way possible with the best use of the PC resources (memory etc.) because this process will run for hours. Any suggestions?
It would be very nice if somebody could give me some help with this.
Kind regards,
beam
Attachments:
program flow diagram.vi ‏11 KB

The method you use to analyze your data is fine. The only thing I would watch out for is memory problems. If you keep with the numbers you gave earlier, 100 waveforms at 3000 pts/wfm, you will be transferring 2.4MBytes of data per set. This is way over the 1MByte buffer NI-SCOPE uses for data transfer. It will work, but it might be slow. If you have problems, switch to niScope Fetch WDT.vi for your acquisition and move it inside the loop. Before you call the fetch VI, set the record it will fetch by using the property node and setting Fetch->Fetch Record Number using your loop index.
A couple of other performance tips I think you probably know. The graph inside the loop will slow you down a lot. In addition, the graph of all the data outside the loop will also take a fair amount of time (plotting 2.4MBytes of data). If you want to see just the last waveform, pop-up on the terminal going out of the loop and disable indexing so only the last waveform goes through, not all of them.
Your analysis method should work fine. You may consider doing an I16 fetch instead of the WDT fetch you are currently using. This will reduce your memory usage by a factor of four, provided you don't immediately convert it to a double array. If your analysis is actually finding a max/min, this is faster on an integer array than a double. You can scale the integers using the numbers in the information cluster. It is much faster to scale one integer at the end than a whole array. That said, the I16 fetch is not particularly faster than the WDT fetch, just less memory. This choice will depend on your analysis.
The min record length is the minimum number of points the device will acquire. The actual record length is different if the acquisition rate you ask for is not one of the acquisition rates the device is capable of. The acquisition rate is then coerced to the next highest rate and the record length increased so your acquisition time remains constant. This behavior is part of the IVI specification for digitizers. Using your VI as an example, you ask for 300kS/s acquisition rate and 800 data points. What you actually get is 300,300.3003 S/s and 801 data points. The sample rate is determined by an integer divisor from 100MHz, in this case 100,000,000/333. So, if you really want a certain number of data points, you need to set the sample rate to a physically realizeable one. Alternately, you can just fetch the number you want instead of all the points, realizing your sample window will be a bit shorter than you asked for.
You are correct. To see anything in the records done, you need to delay. However, in this code, the records done output is really not doing anything. The fetch won't fetch until everything is done, so you know all is finished when your data shows up. I would just delete it. If you do want to put a delay in, wrap a sequence structure around the records done query. Add a frame before the current frame and drop a Wait (ms)delay into it. You can find this primitive in the timing and dialog palette. This is an example of when the sequence is actually useful. The delay VI has no good way of enforcing data flow, so the sequence does it.
The way you have implemented it, you don't need to poll acquisition status. To get acquisition status, use niScope Acquisition Status.vi. You would put this in a WHILE loop before your acquire and exit the WHILE loop when the acquisition was done (or an error occurred) to proceed to the acquisition. Make sure you also put an appropriate delay in the WHILE loop or it will eat your entire processor capacity. The delay should be based on how long you expect the acquisition to take.
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Let me know if you have any more questions...
This account is no longer active. Contact ShadesOfGray for current posts and information.

Voice recording using external microphone

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How do I use an external mikrophon

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Using an External Hard Drive vs. a separate computer for music producing

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If you want to do this in a cost-effective way, you should delete some files you don't need from your macbook pro to make room for logic pro. Even though Logic Pro has around 50 GB of stuff, most of it comes from the Jam Packs, which I'm guessing you won't really need to use...So make room for Logic Pro on your laptop and install it there...then use the external hard drive to store and record your music to.
If you're going to get a mac mini with that type of spec, you might as well buy a new macbook pro with the same specs and better.
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NI6602 pulse width measurement: Do I have to use an external sample clock?

Hi
In the .NET 4 example 'MeasPulseWidthBuf_SmplClk_Cont' it is stated in the comments that:
An external sample clock must be used.
Counters do not have an internal sample clock available. You can use
the Gen Dig Pulse Train-Continuous example to generate a pulse train on
another counter and connect it to the Sample Clock Source you are using
in this example.
I have an application running without specifying an external clock. The applications is running, but I'm not sure I can trust the recorded data. Here is the channel creation code:
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task.CIChannels.All.DataTransferMechanism = CIDataTransferMechanism.Dma;
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Note that I'm not specifying any external clock.
1) Which clock is the daq using? -It is obviously using some clock since I can collect data via this task.
2) Do I need to change the configuration to use an external clock to achieve reliable readings - as mentioned in the 'MeasPulseWidthBuf_SmplClk_Cont' example?
/mola
Solved!
Go to Solution.

Hi mola,
That specific example is for sample-clocked pulse width measurements. This type of measurement is only supported on newer hardware such as X Series boards and will not run on the 6602.
Your application that you linked uses Implicit timing, meaning that the signal itself serves as the sample clock. That is, at the end of each pulse width that you measure, the sample is deterministically latched in. So, you end up with a buffered array of every pulse width that is seen by the counter.
Best Regards,
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How & why Record with an external drive?

Hi. Okay, in another topic I posted it was recommended that I record with an external drive and not the internal drive... I have a 7200rpm firewire 400 lacie drive... so how do record with it? Why and how will this improve my Logic Pro recording experience? I also have a FirePod firewire interface.
Thanks,
Bill K.

To record onto an external drive, simply go to the audio menu and choose "Set Audio Record Path..." From here set your recording path to be somewhere on your external drive.
In general, it best to record to a drive other than your system drive. Depending on what you are doing, the system drive can be writing/reading cash files, data files and doing other Logic/OSX related activities in the background, all of which slows down your disk. You of course can still use your system drive to access data, but because its doing other operations, you may not be able to run as many audio tracks at once as you could using a dedicated external drive.
Try both methods and see which works best for you and your system.

Recording using an external HD

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