[Discuss-gnuradio] Questions about using sound card for data tranfer.

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Hi, bodys:)

I'm trying to use the sound card to transferring bits and I find it may not be as easy as using USRP.
My efforts are based on the fsk_tx.py and fsk_rx.py.
The audio.sink & audio.source only I/O float type data, and not
like USRP, we cannot set decimation ratio or interpolation ratio for
sound card.
So I set this two ratio to 1 and use complex_to_float &
float_to_complex connecting the sound card with modulating &
demodulating blocks.
But I seriously doubt if it is right in this way, and not surprising, I get nothing at the rx.
To ensure the validation of the configuration of fsk mod and demod, I
write another script with framing, modulation, demodulation and
deframing connected in a line without sound card. It works well and the
received frame seq number can be correctly printed out. Besides, I can
here the sound of transmitted signal from the sound card, and the
line-in input is ok.

Needing some hints about doing communication with sound card. My source codes are mailed.

Hanwen

audio_send.py
Description: application/python

audio_recv.py
Description: application/python

check_fsk.py
Description: application/python