Recording and playback from microphone on MAC OS X?

Hi there,
I have tried out recording using JavaSound....on Windows it works fine, but not on MAC OS X ... it give an "audio data not supported error".
So then i try using quicktime java... refering to the demo file
SoundRecord.java....i need to modify the codes....and make it into an applet. And since i will be runnning it from a CD, i need it to save on hard disc and later on retrieve it to Playback.
Has anyone dealt which this similar problem?
Please help me, i need to solve this as soon as possible.
Thank you.

As i browsed thru the net...that is all i get...JavaSound cant work on MAC.So now i am doing using QuickTime Java. But i get an error when i run the applet...java.lang.SecurityExecption: Only able to capture media with security settings when class is signed.
What do i do then?
I tried making it signed with a dummy certifiate...it is signed...but when i run it i get the same error message.
Please, i need this to be solved as soon as possible.

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Hi,
We're testing record and playback using USRP-2920( LV 2013sp1, NI-USRP 14)
To test it, we downloaded record and playback example code.
Signal source is a function generator outputting 6 MHz bandwidth 8 VSB modulation signal.
USRP Rx parameters are center = variant / gain = 0 / IQ rate = 25MHz and Tx parameters are center = same as Rx center / gain = 0 / IQ rate = 25MHz
The problem is... in low carrier frequency like 70MHz, quality of playback signal is great.
But in high carrier freqency like 2.2GHz, SNR and signal power dropped significantly i.e. they tend to drop as carrier frequency goes high.
And the strange thing is as carrier frequency is increased, a small peak on the center is increased as well.
Please check the attatched file to see the tendancy.
So.. my question is why is this tendancy occures?(we tested another USRP and the result was same as before)
and what should we do to reduce this effect?
Regards,
Youngmin
Attachments:
record and playback results.xls ‏469 KB

Hi,
I suggest a couple of things:
NI USRP 2920 is a non-calibrated device. So setting a gain value of 0 at different frequencies could mean a different actual gain. So try increasing the Rx recording gain (on the USRP) in cases where you observe low SNR. Similarly Tx is not calibrated.
Is the signal recording done with cables or over wireless medium ? You can try to eliminate any spurious signals if you use SMA cables while recording.
I think the power at the center of the spectrum is the DC offset. You may refer to the DC Offset/LO leakage section in the best practices section here http://www.ni.com/white-paper/13881/en/
Thanks.

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Recording and playback from microphone on MAC OS X?

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