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Before we're going anywhere, first we need to understand the most basic concepts about GNU Radio: ''flow graphs'' and ''blocks''.
 
Before we're going anywhere, first we need to understand the most basic concepts about GNU Radio: ''flow graphs'' and ''blocks''.
  
Flow graphs are graphs (as in [http://en.wikipedia.org/wiki/Graph_Theory graph theory]) through which data flows. Many GNU Radio applications contain nothing other than a flow graph. The nodes of such a graph are called ''blocks'', and the data flows along the edges.
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Flow graphs are graphs (as in [http://en.wikipedia.org/wiki/Graph_Theory | graph theory]) through which data flows. Many GNU Radio applications contain nothing other than a flow graph. The nodes of such a graph are called ''blocks'', and the data flows along the edges.
  
 
Any actual signal processing is done in the blocks. Ideally, every block does exactly one job - this way GNU Radio stays modular and flexible. Blocks are usually written in C++ (might also be Python); [[OutOfTreeModules|writing new blocks]] is not very difficult.
 
Any actual signal processing is done in the blocks. Ideally, every block does exactly one job - this way GNU Radio stays modular and flexible. Blocks are usually written in C++ (might also be Python); [[OutOfTreeModules|writing new blocks]] is not very difficult.

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