How can Receiver separate between two different frequency's input

GNU Radio
1

I am working on an application where i receive input at audio_sink and
check for tone or data.
Data is FSK modulated at 1k and 3k whereas Tone is of 2k (i.e Tone lies
in
the middle).

I have written a flow graph which consists of two heirarichal flow
graphs
(tone_rx and data_rx).
Input is received at audio_sink and then forwarded to both sub-graphs.

My code works fine when tone is received but there is a problem when
Data
is received.
Because Data consists of FSK code and it has 2k components in it which
also
triggers Tone graph.

So i want to ask is there any GnuRadio Block by using which i can avoid
triggering of tone while receiving Data
as i need to eliminate 2k component for Data but retain it when input it
is
Tone. OR
is there any such method by which we identify at the start whether it is
data or tone.
i am using laptop sound card (not usrp).

                 ____________________
                                      -------> |  Tone Rx Flow Graph

|
__________ | |______________|
| audio_sink ||
|__________| |
|

                                      ------- > |  Data Rx Flow

Graph
|
|____________________|

–
*
Best Regards

Niaz A.*
Lab Engineer
NUCES-FAST, Islamabad Campus
EXT-271

Engineers motto: cheap, good, fast: choose any two

2

My code works fine when tone is received but there is a problem when
i am using laptop sound card (not usrp).

Simple first approximation. Use the short-term-average power calculated
over the data channels (1KHz and 3KHz), to drive a squelch
function on the 2KHz channel. I’ll leave the details up to you, but
I’d basically have some logic that said “if energy at 1KHz and energy at
3KHz,
squelch the 2KHz tone channel.”

–
Marcus L.
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

3

Thanks Marcus,
I appreciate your approach and i guess i will need goertzel transform
over
these frequencies.

On Wed, Nov 2, 2011 at 2:25 AM, Marcus D. Leech [email protected]
wrote:

My code works fine when tone is received but there is a problem when Data
i am using laptop sound card (not usrp).
–

https://lists.gnu.org/mailman/**listinfo/discuss-gnuradiohttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio

–
Niaz A.

We are always more anxious to be distinguished for a talent which we do
not possess, than to be praised for the fifteen which we do possess*
: Mark
Twain http://thinkexist.com/quotes/mark_twain/*