Re: Trouble understanding multiple independent signals

GNU Radio
1

Hi all,

I have been playing around with the fm_tx_2_daughterboards.py and others
to
send multiple signals at once. I just wanted to confirm my
suspicions about the USB transmit path because I didn’t see anyone
explicitly talking about this: When I look in the usrp1.py and usrp.py
files
that only one interpolation parameter is given per USRP sink. So, I am
assuming for now that the signals I transmit must have the same sampling
rate
(i.e. the same interpolation rate) coming across the USB cable. Is this
correct? Because the signals will have to be interleaved to go across
the USB,
it would make sense that they would have to be the same sampling rate,
but maybe
I’m missing something.

Thanks for any comments,

David S.

2

You are correct. The signals need to be at the same sampling rate for
the interleaver to work. We are currently working on a modification of
that such that you can have different rates on both channels.

Thomas

3

On Mon, Sep 18, 2006 at 09:53:49AM -0400, [email protected] wrote:

correct? Because the signals will have to be interleaved to go across the USB,
it would make sense that they would have to be the same sampling rate, but maybe
I’m missing something.

Thanks for any comments,

David S.

Hi David,

Your understanding is correct.

There’s a slight chance that this will change at some point in the
future, but don’t hold your breath :wink:

Eric