Peak Detector2: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Detect the peak of a signal.
This is the template for the [[:Category:Block_Docs|"Page-per-block Docs"]].  This first section should describe what the block does and how to use it, using however many paragraphs necessary.  Note that the title of the wiki page should match the block's name in GRC, i.e. the one defined in the block's .grc file.  Look at the [[FFT]] Block for a good example.


As this is a basic template, it's also in the [[:Category:Stub_Docs|"Stub Docs category"]]. Please improve it.
If a peak is detected, this block outputs a 1, else it outputs 0's. A separate debug output may be connected, to view the internal estimated mean described below.


== Parameters ==
== Parameters ==
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>
(''R''): <span class="plainlinks">[https://wiki.gnuradio.org/index.php/GNURadioCompanion#Variable_Controls ''Run-time adjustable'']</span>


; Param 1 (''R'')
; TH factor rise (''R'')
: Description of parameter, provide any tips or recommended values. Note that the name of the parameter above should match the param's label that shows up in grc (e.g. Sample Rate).
: Determines when a peak is present. An average of the input signal is calculated (through a single-pole autoregressive filter) and when the value of the input signal goes over threshold_factor_rise*average, we assume we are in the neighborhood of a peak. The block will then find the position of the maximum within a window of look_ahead samples starting at the point where the threshold was crossed upwards.


; Param 2
; Look ahead (''R'')
: blah blah blah
: Used when the threshold is found to look if there another peak within this step range.
 
; Alpha (''R'')
: One minus the pole of a single-pole autoregressive filter that evaluates the average of the input signal.


== Example Flowgraph ==
== Example Flowgraph ==


Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI. Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately. The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
This flowgraph can be found at [https://github.com/gnuradio/gnuradio/blob/master/gr-blocks/examples/peak_detector2.grc].
 
[[File:Peak_detector2_fg.png|800px]]
 
== Example Output ==
 
[[File:Peak_detector2_out.png|800px]]


== Source Files ==
== Source Files ==

Latest revision as of 14:13, 9 March 2021

Detect the peak of a signal.

If a peak is detected, this block outputs a 1, else it outputs 0's. A separate debug output may be connected, to view the internal estimated mean described below.

Parameters

(R): Run-time adjustable

TH factor rise (R)
Determines when a peak is present. An average of the input signal is calculated (through a single-pole autoregressive filter) and when the value of the input signal goes over threshold_factor_rise*average, we assume we are in the neighborhood of a peak. The block will then find the position of the maximum within a window of look_ahead samples starting at the point where the threshold was crossed upwards.
Look ahead (R)
Used when the threshold is found to look if there another peak within this step range.
Alpha (R)
One minus the pole of a single-pole autoregressive filter that evaluates the average of the input signal.

Example Flowgraph

This flowgraph can be found at [1].

Peak detector2 fg.png

Example Output

Peak detector2 out.png

Source Files

C++ files
TODO
Header files
TODO
Public header files
TODO
Block definition
TODO
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