NBFM Transmit: Difference between revisions

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[[Category:Block Docs]]
[[Category:Block Docs]]
[[Category:Stub Docs]]
Narrow Band FM Transmitter.
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.
Takes a single float input stream of audio samples in the range [-1,+1] and produces a single FM modulated complex baseband output.
 
The only difference with [[WBFM Transmit]] is the size of the internal low pass filter for interpolation.  
Here it has a cutoff frequency of 4.5kHz with 2.5KHz of transition width.


== 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'')
; Audio rate: Sample rate of audio stream, >= 16k (integer)
: 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).
; Quadrature rate: Sample rate of output stream (integer). Must be an integer multiple of Audio rate.
; Tau: Preemphasis time constant (float)
; Max deviation (''R''): Maximum deviation in Hz (float)
; Preemphasis High Corner Freq: High frequency at which to flatten preemphasis; < 0 means default of 0.925*Quadrature rate/2.0 (float)


; Param 2
== Example Flowgraph ==
: blah blah blah


== Example Flowgraph ==
This flowgraph shows a signal source feeding a Narrow Band FM modulator driving a PlutoSDR Sink block.


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.
[[File:Pluto_NFM_xmt_fg.png|800px]]


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


; C++ files
; Python files
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/python/analog/nbfm_tx.py]
 
; Header files
: [https://github.com/gnuradio/gnuradio TODO]
 
; Public header files
: [https://github.com/gnuradio/gnuradio TODO]


; Block definition
; Block definition
: [https://github.com/gnuradio/gnuradio TODO]
: [https://github.com/gnuradio/gnuradio/blob/master/gr-analog/grc/analog_nbfm_tx.block.yml]

Latest revision as of 02:09, 25 May 2020

Narrow Band FM Transmitter.

Takes a single float input stream of audio samples in the range [-1,+1] and produces a single FM modulated complex baseband output.

The only difference with WBFM Transmit is the size of the internal low pass filter for interpolation. Here it has a cutoff frequency of 4.5kHz with 2.5KHz of transition width.

Parameters

(R): Run-time adjustable

Audio rate
Sample rate of audio stream, >= 16k (integer)
Quadrature rate
Sample rate of output stream (integer). Must be an integer multiple of Audio rate.
Tau
Preemphasis time constant (float)
Max deviation (R)
Maximum deviation in Hz (float)
Preemphasis High Corner Freq
High frequency at which to flatten preemphasis; < 0 means default of 0.925*Quadrature rate/2.0 (float)

Example Flowgraph

This flowgraph shows a signal source feeding a Narrow Band FM modulator driving a PlutoSDR Sink block.

Pluto NFM xmt fg.png

Source Files

Python files
[1]
Block definition
[2]
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