FM demodualtion using usrp connection through MXI and labview issue

[Aht22]

hello everyone,

I want to demod FM signal, for this purpose we use LabVIEW and USRP and connect through MXI connection, I use USRP streaming project and use MT demodulate FM Block to demodulate the signal and successfully demod the data but i play the sound is like a robot sound and an also I saw a tone peak at 0HZ  and listen a sound the beep listens to the audio data.

kindly guide me how to remove this tone and improve the audio quality (rebot like tone to human sound ) 

is there resampling issue??

i played a sound at 44100Hz .

thanks in advanced,

[Chan82]

Hi,

You can refer to the shipping example for understanding FM demodulation: niUSRP EX FM Demod Sound Card (Shift Reg).vi. 

1. Did you configure the proper carrier frequency and IQ rate to extract the specific FM signals?

2. Did you use APIs to connect FM demodulated signals to your soundcard?

If you only use MT demodulate FM block, you need to use additional functions as implemented in the shipping example.

Thanks.