modulation toolkit SSB demodulation

[madd]

Hello

i have been doing a supressed carrier SSB demodulation , i can not hear the voice. But when i demodulate the SSSB signal using AM(DSB) demodulation it even then do not demodulate correctly but it sounds like some one is trying to speak(like scrambled voice ).i have a base band signal using 5661.i have read somewhere about "beat frequency oscillator " to hear the SSB signals does NI SSB demod VI block requires the same. i thnik it should not since signal is already on baseband. Any idea why i am unable to hear the voice on SSB and why do i hear murmuring on DSB.

Regards

[Elizabeth_K.]

Hi,

Can you describe more about how you are modulating the signal or where the signal is coming from?

Are you ensuring that you wire in a True constant for "suppressed carrier?" in the MT Demodulate AM (SSB) VI? I find the help very useful for these types of questions. You can get to the help for that VI by pressing ctrl-H, hovering over the VI, and then clicking "Detailed Help" in the box that comes up. Are you providing a pilot extraction filter or costas loop parameters?

If you can provide more information about the incoming signal and your code (feel free to post it), then we may be able to better answer your questions. It makes some sense that if you were expecting a DSB signal but recieved a SSB signal, you would be missing some information, and therefore hear the garbled voice. But without the specifics of your code and the input signal, it is hard to determine exactly what is going on.

Regards,

Elizabeth K. 

National Instruments | Applications Engineer | www.ni.com/support