Gnuradio/Wav to Waterfall: Difference between revisions
From charlesreid1
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Sampling rate : 391 KHz | Sampling rate : 391 KHz | ||
Bit depth : 16 bits | Bit depth : 16 bits | ||
Stream size : 311 MiB (100%) | Stream size : 311 MiB (100%) | ||
</pre> | </pre> | ||
Now we'll be able to use gnuradio to feed these two channels of sound data into a radio spectrum visualizer. | |||
==Using the Wav File in Gnuradio== | |||
You can use the wav file as a source of sound data by using a "Wav File Source" block. Double click on the block, and pick your wav file to associate it with the block. | |||
Revision as of 23:49, 17 August 2015
This covers my first foray into signal decoding with SDR and gnuradio.
Recording the Signal
I basically wanted to record a signal from an Amateur Radio WebSDR station, and figure out how to import it into gnuradio for signal analysis. Recording the signal was easy - the web interface actually has a recording capability. So it's as simple as clicking a button.
But these WebSDR recordings were single-channel. Then I found an observatory that provides SDR data that's two channels, and a higher sample rate: http://to117.aai.ee/public_to117/Obs/SDR/HighRPM/Dish/
The Wav File
Okay, now I had a wave file with a recording of a signal. But what information was contained in the recording?
Getting Info about the Wav File
You can use the mediainfo utility to get some info on the wav file:
mediainfo HDSDR_20140505_180828Z_437209kHz_RF.wav General Complete name : HDSDR_20140505_180828Z_437209kHz_RF.wav Format : Wave File size : 311 MiB Duration : 3mn 28s Overall bit rate mode : Constant Overall bit rate : 12.5 Mbps Audio Format : PCM Format settings, Endianness : Little Format settings, Sign : Signed Codec ID : 1 Duration : 3mn 28s Bit rate mode : Constant Bit rate : 12.5 Mbps Channel(s) : 2 channels Sampling rate : 391 KHz Bit depth : 16 bits Stream size : 311 MiB (100%)
Now we'll be able to use gnuradio to feed these two channels of sound data into a radio spectrum visualizer.
Using the Wav File in Gnuradio
You can use the wav file as a source of sound data by using a "Wav File Source" block. Double click on the block, and pick your wav file to associate it with the block.