Number of taps in pfb filter?

GNU Radio
1

hello list,
when I am trying to channelize a baseband with following specs:
sample rate: 2MHz
bandwidth for low pass filter: 145kHz
transition bandwidth: 10 kHz
number of channels: 10
pfb decimation: 4

When I see number of channels is 91 taps/channel, but I think its too
much,
please guide me how to reduce taps/channel

2

On 07/18/2014 06:55 AM, gsmandvoip wrote:

hello list,
when I am trying to channelize a baseband with following specs:
sample rate: 2MHz
bandwidth for low pass filter: 145kHz
transition bandwidth: 10 kHz
number of channels: 10
pfb decimation: 4

When I see number of channels is 91 taps/channel, but I think its too
much, please guide me how to reduce taps/channel

In order to reduce taps, you must increase the transition bandwidth. Use
the filter design tool to get a feeling for this.
Note that this is basic signal processing knowledge, if these things are
unclear I recommend you study a DSP textbook. For recommendations, see
the gnuradio.org wiki and the ‘suggested reading’ section.

Martin

3

On Fri, Jul 18, 2014 at 4:47 AM, Martin B. [email protected]
wrote:

much, please guide me how to reduce taps/channel

In order to reduce taps, you must increase the transition bandwidth. Use
the filter design tool to get a feeling for this.
Note that this is basic signal processing knowledge, if these things are
unclear I recommend you study a DSP textbook. For recommendations, see
the gnuradio.org wiki and the ‘suggested reading’ section.

Martin

I’d recommend fred harris’ book Multirate Signal Processing specifically
to
help you with this question.

Tom