The simplest example is the dial_tone example in which you will be listening a dial tone from the sound card.
$ cd /usr/share/gnuradio/examples/audio
$ ./dial_tone.py
The Block diagram of Dial tone is as follow
To view the code behind dial_tone block
$ cd /usr/share/gnuradio/examples/audio
$ gedit dial_tone.py
It will open code for the dial_tone. You can understand the basic flow by viewing the commented code.
The Basic objective of this block is:
Setting up sinewaves at 350 and 440Hz
Create singal generating blocks
Defining destination
Connecting source and destinations
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