sound source

[didi80]

Hi all, I am want to build a stand sound source. I am think of a system with a microphone and loudspeaker in a closed loop.

The loudspeaker should be controlled based upon mesauring the sound field. if the sound recieved from the microphone

is not equal to that produce by the loudspeaker the system should automatic adjust itself.

[Hooovahh]

You say you want stand alone.  Does that mean no PC?  If this is true you will need some kind of embedded setup.  Something like cRIO, or MyRIO.  A cheaper setup but much more involved would be something like an Arduino, or other embedded microcontroller which is unrelated to LabVIEW.

[NIquist]

It sounds like you're trying to make a AGC system that will always result in runaway amplification.  Can you describe your application a little better?  Is this a school project?

[didi80]

Hi, I mean stable sound source, I am thinking of using a DAQ device like a BNC-2110, function generator, speaker,possible amplifier and a microphone.

the speaker produces the sound generated by function generator and the amplifier. the microphone received the sound and the loop should compare the

sound from the speaker and microphone if there are equal no thing happens,if not the amplifier or the system should make the sound to be the same in other

to have a stable sound source.

[didi80]

 I am using LabVIEW 2012 with sound and vibration tool kid. yes I am try to make a runaway amplification. I have attached a simple block diagram of

what i am thinking as a stable sound source tool.  I am thinking of using a DAQ device like a BNC-2110, function generator, speaker,possible amplifier and a microphone.

the speaker produces the sound generated by function generator and the amplifier. .

[ThiCop]

Hello didi80,

Are there any specific "fixed" components for your set-up? (eg. a specific generator that you need/have to use)

Is there any extra information concerning the specifications of this set-up?

[didi80]

Hello ThiCop,

I am using a Agilentt 33220A, 20Mkz function generator, B&K microphone

specification of sound source

- frequency range from 100Hz to 10KHz

- directivity of sound source with an angle range of 90 degree( -45 to 45) should have +-1dB(A)

- stability 0.5 dB of sound source

[NIquist]

What kind of DAQ card are you going to use?  The BNC-2110 is not a DAQ, it's a connection box with no active components inside.  You need to tell us what actual card you are going to connect the BNC box to.  

Also, can you upload a picture of whatever is in you DOCX file?  Many of us prefer not to open files that can contain macros due to security reasons.  No offense indended!  

[didi80]

I am using the pci-6052e series.

[NIquist]

OK, that's a legacy E-Series card but it supports the latest DAQmx drivers (9.5.1) so it's easy to work with.  It's hardware specs are more than sufficient to record and play 16-bit audio at fast sample rates.  How are your DAQ programming skills? Have you looked at the DAQmx examples?