Buil-in microphone frequency response graph

I'm curious as to where I can find a frequency response graph for the built-in mic in the 15" MBP 2.8. I know it's a silly thing to want, but... Sometimes I don't have the time or resources to set-up an external mic with a flat frequency response, and would just like to use the built-in mic very quickly to "EQ" or "ring out" rooms. I can't find the info on the built-in mic anywhere. Any suggestions?

Have you ever used the microphone? Have you ever actually used a laptop to do this?
I don't have a graph, but from years of working with audio I can tell you that it doesn't have the frequency response, sensitivity and directionality to do what you want.
A nice external mic and portable interface like the iMac would not only do a better job but would look a lot more professional than running around trying to point the cheap microphone of a laptop in the right direction.

Similar Messages

  • Microphone frequency response

    Hi
    Does anyone know where I might find data on mobile phone microphone frequency response (like frequency response curves)?
    Thanks. 

    Hi
    Does anyone know where I might find data on mobile phone microphone frequency response (like frequency response curves)?
    Thanks. 

  • Microphone frequency response function

    Hi all,
    I am trying to do an impact test with 3 types of sensors to investigate surface properties of a material.
    The first sensor is the sensor in the modal hammer.
    The second sensor is a geophone , whilst the last sensor is an air-coupled sensor in the form of a microphone.
    Aside from the microphone which is directly connected to the laptop by USB, the instrumented hammer and the geophone is connected to the NI 9233 which is connected to the NI USB-9162 which finally connects to the laptop.
    This hardware doesn't support analog triggering therefore software triggering is used.
    I am using a vi example from http://www.ni.com/example/28438/en/ 
    I have successfuly setup the LabVIEW VI to read the raw data coming in from all the sensors and to obtain the frequency response of the geophone due to stimulus signal created by the impact hammer.
    I have tried to obtain the frequency response of the microphone due to the modal hammer however no results show up in the graph for the frequency response of the microphone.
    My question is this, what is going on and how do I fix this so that I may obtain the frequency response of the microphone?
    I have attached my vi for your consideration.
    Solved!
    Go to Solution.
    Attachments:
    Y2014M01D28 IRnMicFRFRecAll .vi ‏190 KB

    I cannot fix your VI because I do not have DAQmx or the SVFA toolkit. What I have attached is a simulation which shows some of the concepts.
    The left side simulates acquisition of two channels (hammer and geophone) via the DAQ device and one channel of sound (microphone).  Don't worry too much about the details. I just threw this together quickly. The hammer signal is a square pulse, the geophone signal is one cycle of a sine wave with noise, and the microphone signal is one cycle of a triangle wave plus noise. Each of the pulses is dleayed from the start of the acquisition by different amounts to represent the trasmission delays of the sound and vibration.  The values chosen are arbitrary and do not simulate any physics.
    I used the sampling rate, block size, and duration controls from your VI, so the numbers of samples and the sampling rates should be the defaults from your VI. The three graphs one the left show the three signals as generated. Note that the Microphone graph has X-axis autoscaling turned off. Also the data is all in waveforms or arrays. I avoid the use of the Dynamic Data Type produced by Express VIs because it effectively obscures the data structure.
    The right side shows one way to do the triggering. I used Basic Trigger Level Detection.vi from the Waveform Monitoring palette and the Get Waveform Subset.vi from the Waveform palette. Note that there are separate trigger VIs for the DAQ channels and the sound channel. Because they are not started at the exact same time and they do not have the same dt (= 1/sample rate), the waveforms cannot be combined to use a single trigger. The geophone signal is synchronized with the hammer signal so one trigger from the hammer can be used to get both subsets.
    Note that with the default delays the microphone pulse occurs 30 ms after the geophone pulse but in the subsets it occurs about 4 ms before the geophone. This is due to the independent triggering.
    Since you do not have a common signal or trigger for both devices (DAQ and sound), you cannot know exactly what the timing relationship is between them. On every run the differences in the start times will vary. So you will need to do some kind of calibration to determine the time delays.  I am thinking of some kind of periodic stimulus which will produce several pulses to both the geophone and microphone. The first pulses will have indeterminate delays but subsequent pulses should have reproducible delays. The relative spacing and directions during the calibration runs should be the same as the hammer position for the real experiment.
    Lynn
    Attachments:
    Sound and hammer sim.vi ‏28 KB

  • Does anyone have a frequency response graph for macbook pro inbuilt mic?

    like the title says, any freq. response graphs? and any other performance specs on the mics? want to find out if I could use it to acoustically test a room, witht he right clibrations

    Boot Camp Assistant is part of OS X.
    You will have to talk to Microsoft about where to get a copy of Windows at.
    Allan

  • Frequency response vi and writing to lvm files

    I'm having trouble writing the magnitude y/x of the frequency response vi to an .lvm file.
    I don't get any samples in my file when I run the program.
    Any idea what I'm doing wrong here?
    Attachments:
    testernw.vi ‏381 KB

    Hi,
    If you place indicators immediately before and after the frequency response express VI, what do they show?  Are there any differences between the input data before and after the conversions are applied?  I tried putting together a simple VI that takes two simulated signals, inputs them into the frequency response graph, and then outputs it to a file.  It appears to work fine, as long as the two inputs are at a different frequency.
    What version of LabVIEW are you using?  Where specifically are you reading the 0 values?
    Regards,
    Lauren
    Applications Engineering
    National Instruments

  • Frequency Response Analyser or Impedance Spectroscopy

    Hi
    I am looking for a Labview program to allow the freq. response of say a
    tuned circuit.
    I will be using a GPIB Function Gen. From 1Hz to 10MHz and measuring the
    peak-peak value across a shunt resistor that is in series with the tuned
    circuit.
    Thus as the frequency increases then the tuned circuit will respond
    accordingly. If we take samples every 100Hz then we can produce a spectra
    of the tune circuit.
    I actually going to use this for measuring the char. of an electrochemical
    cell.
    Any Suggestions
    Wayne

    Thanks Carlos
    The latter method I did not think of but will try it.
    Cheers
    Wayne
    "JuanCarlos" wrote in message
    news:[email protected]..
    > Wayne,
    >
    > Looks like a sweep sine analysis should give you a good idea about the
    > frequency response. Make sure that you measure the input and output
    > signals of the circuit; this way you can just compeir RMS values and
    > get the frequency response.
    >
    > Another method that you may want to look into is a broad band
    > frequency response. Basically you send white noise to the circuit;
    > then you acquire the input noise and the output noise; the you
    > calculate the FFTs of this data and compair it; after some averaging
    > you get the frequency response graph of your dev
    ice. LabVIEW has a VI
    > called Frequency Response Function that does a large part of the job;
    > together with the "Frequency Analysis of a Filted Design.vi" example
    > you can get a good idea on how to perform this test.
    >
    > I hope this helps.
    >
    > Regards,
    >
    > Juan Carlos
    > N.I.

  • Raw Frequency Response Data

    Hi
    I'm working on a model of a LIDAR system that currently uses a PXI-5620 for data acquisition. I would like to include the card's frequency response in my model. I have found the spec. sheet which contains several frequency response graphs. I was wondering if anyone knows where I might be able to obtain the data points used to generate these graphs. It would save me time as well as improve the accuracy of the model.
    Thanks
    Marc

    Hi,
    Sorry, but we do not provide these informations to our customers. You have to generate these data points yourself.
    Cheers,
    Philip

  • Microphone's frequency response

    Hi,
    Is it possible to plot a microphone's frequency response using sound and vibration? If it's possible, can anyone tell me how?
    Thanks

    Hi popcorn,
    If you have the Sound and Vibration Assistant with SignalExpress, there is a step you can add under Analysis - Frequency Domain Measurements called, Frequency Response.
    Here's a link to an article that discusses various functions, Sound and Vibration provides.  Although the article discusses LabView, many of the same functions are found in SignalExpress as well.  The Frequency Response Function can be found at the bottom.
    http://zone.ni.com/devzone/cda/tut/p/id/3030
    Aki T.

  • Loudspeaker Frequency Response

    Hi all! I'm making a program to measure the frequency response of a loudspeaker. I'll be using a sweep to test the loudspeaker. 
    Particularly i would like the program to be like this, which is real time. How can i implement this in LabVIEW. This is the screenshot
    Details about the plot.
    First graph:
    Shows a plot in real-time of a frequency sweep with a constant sine sweep amplitude of 1 V. When sweep is started, the graph shows a plot of FFT moving from left to right, with peak of FFT at maximum amplitude of 1 at corresponding frequency of the sweep.
    Second graph:
    Shows the plot of the Sound Pressure Level in dB versus freqeuncy.
    Please refer to the picture and video link below.
    https://www.youtube.com/watch?v=sKC3ioWXG38, skip to 4:10

    Assuming your idea is to sweep a frequency into an amplifier connected to the loudspeaker, and measure the frequency response with a microphone:
    You need to monitor the signal at the loudspeaker terminals to account for any non-linearity's in the signal generator and amplifier.
    You need to know the frequency response of the microphone, this is difficult, and that is why calibrated microphones are expensive.
    You need an anechoic chamber so that the results are not affected by any room resonances.
    Your sound level plot is in dB (A). My understanding of the A weighting is so that the human perceived loudness is constant across the audio frequency range. If you are concerned about loudspeaker performance, is it worth discarding the complexity of this additional frequency response curve?
    This will be a difficult project. Please let us know how you get on.

  • Frequency response formula

    Hello!
    I have done the following experiment to find out the frequency response of a "box":
    I have introduced a sound speaker inside a box emitting pink noise-->I have measured the noise using the "sound and vibration assistant" and a microphone( the microphone is also inside the box)
    Then I have put the microphone outside the box and I have emmited pink noise again (the sound speaker is inside the box)
    With these datas I want to calculate the frequency response of my box so I am using the "frequency response step" of the sound and vibration assistant software.
    My question is: The unit of the amplitude graph of is "dB ref 1E+0" Could someone tell me which is the formula to calculate the frequency response of my box and obtain the units of "dB ref 1E+0"???
    Thank you!

    Hi dSierra,
    Sorry but I do not understand when you say : "If you want to reconvert to natural units, you just have to invert the equation 20 log (FreqResponse/1 unit (stimulus/response))". Could you explain a little bit more please
    Thank you!
    Best regards

  • Room frequency response measurements

    Does anyone know of a Shareware program available that use your PC's sound card to play pink noise while recording from the microphone, and then display the room's frequency response?
    I have a high-end stereo system and am looking for something that will show me what my room modes are doing.
    Thanks in advance.

    thanks but I'm not looking for pink noise to drown out others. It's to use as a measurement. see my post again.
    1.33ghz PowerBook g4, 17-inch   Mac OS X (10.4.7)   1.5gb ram

  • Frequency Response VS FFT for measring frequency response of a audio ouput signal.

    We have purchased the Sound and Vibration Toolkit and I have some questions.
    From the frequency response example I looked at you measure the input then the ouput and the Vi gives you the difference.
    I want to measure the audio frequency response a radio. 
    So all I have is the output I dont have the audio input  to use as a reference. 
    How would I measure frequency response with the frequency rasponse VI with only the output audio signal?
    I was also looking at the FFT example to measure the audio signal frequency response.
    But from what I can tell so far this only does 1 channel I want to do both channles at the same time.
    Is there a way to do FFT on 2 channels at once and have them output on the same graph?
    Thanks for any help you can provide.

    Hi,
    I was looking through the examples and If you look at the SVXMPL_Multichannel FFT (simulated) examples, this shows how to take an FFT with multiple signals. You just pass in an array of the waveforms.  If you need to put your signals together you can use the merge signals VI, which is located in the Express»SignalManipulation Pallette.  Let me know if you need any further help with this issue.
    Have a great day,
    Michael D
    Applications Engineering
    National Instruments

  • HT1665 frequency response of

    Dear Sir/Madam,
    I used my iphone 4S to collect some acoustic signal. For processing the signal, I need to learn about the frequency response of the in built mic to evaluate the valid frequency range of the result.
    Could you please let me know the frequency response (valid frequency range)of the in built microphone of iphone 4S?  Whether the response frequency curves in the picture below is correct?
    Looking forward for your response. Many thanks in advance!
    Best regards,
    Zhen Yang

    http://manuals.info.apple.com/en_US/iphone_user_guide.pdf
    Try that
    Hope it helps

  • Where can I find the amplitude and phase frequency response when the AC coupling is set on the 4472

    My friends,
      I need to know the amplitude atenuation but most important, the phase distortion introduced on the low frequency components of the signals when the AC coupling is setted (i.e. when the high pass filter is connected) on the 4472 and 4472B DAQBoard.
      I can construct the amplitude frequency response by generating and aquiring a sine waveform of a knew amplitude. But I cannot construct the phase distortion introduced by the circuitry. 
      However, I assume that this crucial information should be available in the DAQ Manual or  in the website of NI, but untill now I haven´t found it.
    Thankning in advance,
    crimolvic from Chile

    crimolvic,
    Here are the Specifications and Datasheet for the 4472.  They indicate a phase non-linearity of less than 0.5 degrees across all frequencies.
    For information on how this varies with frequency, see the attached
    spreadsheet.  This response was the result of testing on a single
    4472.  Although this is classified as a "typical" response, it is
    not gauranteed.
    Have a great, day!
    Travis
    Attachments:
    4472 Phase Linearity.xls ‏21 KB

  • MacBook core duo Sept. 2006  - the audio is a mystery.  Any analogue out has bass boost with bass distortion.  With digital out, by USB or Airport Express Airtunes, the frequency response is normal.  Somewhere, Apple put in an analogue bass boost.. why?!

    Since new, my Macbook core duo has sent all audio to all analogue outputs with frequency distortion.  Some physical hardware or firmware in the analogue section adds a bass boost to the frequency response of the audio....  And, this boost adds bass frequency distortion to most, if not all, of the audio analogue output.
    This happens for all audio sources, players, iTunes, videos, streaming audio/video, movies...  any sound source available to the Macbook.  No-one with whom I have talked about this problem, has ever heard of it.  Not elegant ideas for reducing it are to use equalisers on players and iTunes.  iTunes even has a preprogrammed "bass reduce" on its equaliser, as if it knows already that this inherent bass boost "feature" has been built into the Macbook, and cannot be defeated by the user.
    The digital audio is of sufficiently high quality to play well on a very good to excellent sound-system;  so, it's a shame someone has mucked around with the frequency response of the analogue conversion, by designing the frequency distortion right into the computer.  This motherboard, (which includes the sound-section), has been replaced, along with the speakers, and everything sounds exactly the same as it was before.
    To receive a flat frequency response and no frequency distortion, I listen on one receiver using Airtunes, (it doesn't matter whether or not the analogue or digital output jack is wired analogue or connected via optical cable....  the freq. response is flat);  and I listen on a high-end stereo system using an USB output port to an A/D converter, passing the analogue result using long patch-cords connected to the "line-in" jacks of the stereo.  The bummer is that most of my audio sources are not derived from iTunes...  hence, I cannot use Airtunes with Airport express for them.  I've tried using "Airfoil" without luck.  The sound becomes distorted with sibilance and other frequency anomalies.
    Question:  has anyone else discovered this sound imperfection in any Mac product?  And, does anyone know if Apple is aware of it?  Finally, has anyone found an Apple fix for the problem;  or, at least, come up with better solutions than I have?
    Thanks heaps for any impute and answers you may supply!!  junadowns

    Army wrote:
    This might not help you a lot, but if you want a stable system, try using packages from the repo wherever possible, look at the news before you update your system and don't mess things up (like bad configuration etc.).
    When it comes to performance, you won't gain much by compiling linux by yourself! Just use the linux package from [core] or if you want a bit more performance, install the ck-kernel from
    [repo-ck]
    Server = http://repo-ck.com/$arch
    (this has to go to the bottom of /etc/pacman.conf)
    (use that one which is best for your cpu (in your case this might be the package linux-ck-corex).
    Hmmm, Linux-ck-corex doesn't even load.. I am now trying to install the generic one. Hope it works.
    Edit: I will first try linux-lqx...
    Last edited by exapplegeek (2012-06-26 18:33:31)

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