Difference between revisions of "VCO"

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(add reference to gr-RTTY-basics; revise flowgraph)
 
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[[Category:Block Docs]]
 
[[Category:Block Docs]]
VCO - Voltage controlled oscillator.
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VCO - Voltage controlled oscillator.  Produces a sinusoid of frequency based on the amplitude of the input.  See [[VCO (complex)]] for a complex sinusoidal output.  
  
input: float stream of control voltages; output: float oscillator output
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input: float stream of control voltages;  
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output: float oscillator output
  
 
== Parameters ==
 
== Parameters ==
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== 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.
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This flowgraph can be found at [https://github.com/duggabe/gr-RTTY-basics/tree/master/RTTY_xmt]
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[[File:RTTY_vco_fg.png]]
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For this flowgraph, the standard RTTY tones of 2295 (mark) and 2125 (space) are generated. The calculations for this follow:
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* Choosing a full-scale frequency of 2500Hz with an input of +1, the VCO Sensitivity = (2 * Pi * 2500 / 1) = 15708
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* The space frequency of 2125 is created by vco_offset = (2125 / 2500) = 0.850 volts
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* The mark frequency of 2295 is created by a vector of (1 * 0.068) + 0.850 = 0.918 volts
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See [[Sample_Rate_Tutorial#Sink_hardware_example]] for a discussion of the timing involved in a similar flowgraph.
  
 
== Source Files ==
 
== Source Files ==
  
; C++ fileshttps://wiki.gnuradio.org/index.php/SISO
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; C++ files
 
 
 
: [https://github.com/gnuradio/gnuradio TODO]
 
: [https://github.com/gnuradio/gnuradio TODO]
  

Latest revision as of 10:57, 2 September 2020

VCO - Voltage controlled oscillator. Produces a sinusoid of frequency based on the amplitude of the input. See VCO (complex) for a complex sinusoidal output.

input: float stream of control voltages;

output: float oscillator output

Parameters[edit]

Sample Rate
sampling rate (Hz)
Sensitivity
units are radians/sec/volt
Amplitude
output amplitude

Example Flowgraph[edit]

This flowgraph can be found at [1]

RTTY vco fg.png

For this flowgraph, the standard RTTY tones of 2295 (mark) and 2125 (space) are generated. The calculations for this follow:

  • Choosing a full-scale frequency of 2500Hz with an input of +1, the VCO Sensitivity = (2 * Pi * 2500 / 1) = 15708
  • The space frequency of 2125 is created by vco_offset = (2125 / 2500) = 0.850 volts
  • The mark frequency of 2295 is created by a vector of (1 * 0.068) + 0.850 = 0.918 volts

See Sample_Rate_Tutorial#Sink_hardware_example for a discussion of the timing involved in a similar flowgraph.

Source Files[edit]

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