Hi
I am trying to implement the following acoustic communication transmitter with PC
File Source --> Packet encoder --> gmsk mod --> Rational resampler --> Frequency Xlating FIR filter --> comp to real --> audio sink
Pc has inbuilt sound card. packet encoder is taking 8 samples per symbol, Resampler interpolates samples by 500, FIR filter is set at 19k carrier frequency and 1K bandwidth.
The problem is that I wont get any sort of output at the audio sink. I added an GUI FFT sink at the end of FIR filter, it also showed now output. Please tell what's gone wrong. I am using gnuradio 3.7.4 version.
Thanks in advance