[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Discuss-gnuradio] unknown attenuation after analysis filterbank
From: |
feldmaus |
Subject: |
[Discuss-gnuradio] unknown attenuation after analysis filterbank |
Date: |
Fri, 15 May 2009 12:18:30 +0000 (UTC) |
User-agent: |
Loom/3.14 (http://gmane.org/) |
Hi Gnuradio folks,
i am analysing the spectrum from 1MHz to 2Mhz. I splitted this Spectrum
into 3 parts:
1MHz - 1,333MHz
1,333MHz - 1,666MHz
1,666MHz - 2MHz
Therefore i used the Analysis Filterbank. Because i am searching for si function
in the time domain as a response of a peak in the frequency domain, i want
to use a band pass filter in the Analysis Filterbank.
Do i have to use the band pass filter or can i sill use the low pass filter.
The response should be another one by using the Low pass filter ?
But my main Problem is, that my signal goes down in the second and third band.
I doesn't know why.
Here is my Flow Graph:
Usrp Source --> Analysis Filterbank+Band pass filter --> Selector -->
fft sink graph
My band pass looks like this:
samp_rate=1e6
Intermediate Frequency of the usrp= 1MHz
firdes.complex_band_pass(1.0, samp_rate, samp_rate*0, samp_rate*1/3,
samp_rate*0.01)
Any hints how to correct this ?
Did i anything wrong ?
regards Markus
- [Discuss-gnuradio] unknown attenuation after analysis filterbank,
feldmaus <=