Help for peak detector


#1

Hi All,

i want to build a peak detektor with a Usrp(LFRX),so i hope some of
you can give me some hints about the peak detector modules ?

As i know, there are 3 peak detector:

  1. Detect Peak
  2. Peak Detector
  3. Peak Detector2

Therefore i have some questions:
To 2.) What allowed values for ?
And what does this mean ? Which unit ?
What is Alpha, and which are allowed values ?
If the peak detector gets a peak, what does it spit
out ?
Which are the allowed values for <TH Factor Rise/Fall>,
is this in db or a linear factor ?

Is there any example for a peak detector ?
Is there also a peak detector with a complex input ?

Regards Markus


#2

Markus F. <feldmann_markus gmx.de> writes:

Therefore i have some questions:
To 2.) What allowed values for ?
And what does this mean ? Which unit ?
What is Alpha, and which are allowed values ?
If the peak detector gets a peak, what does it spit
out ?
Which are the allowed values for <TH Factor Rise/Fall>,
is this in db or a linear factor ?

I studied some of the theory to the EWMA(exponentially weighted moving
average),
so i think the can be easily deactivated by setting this to
0.
As i understand, the tries to wait until inputs from
the
future are done and take this into the computing of the average ?

Because the description of the Peak Detector talks about i
think the

is a factor meaningfully greater than <1.0> ? The alpha seems to weight the input values, which are be computed for the average, but i think it also results in a average computing of a longer time ? The alpha should be meaningfully 0 < alpha <= 1.0 . Is this correct ?

A other Problem is that the Peak Detektor freezes the graphical
elements,
but i don’t get any overrun/underrun.
I have got a decimation of 256 and a sample_rate of 250k.
Are there known Problems with the Peak Detector ?

Regards Markus