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Created C16 format (markdown)

Erwin Ried 2020-05-28 21:29:29 +02:00
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The Capture app records into C16 format. Described in the [PortaPack Wiki](https://github.com/sharebrained/portapack-hackrf/issues/139) this format is two channels of 16 bits signed integers. So, the first channel is I and second Q, forming a complex number. You end with three axis for your data, the real, the imaginary and the time (defined by the sample rate).
### Capture manipulation
You can open the C16 file in Audacity importing it as Raw data. Consider the sample rate you used when you captured.
<img src="img/c16_import.png" width="400">
It is possible to manipulate the data as if it was audio. You can apply filters, add silences, trim, mix and merge.
<img src="img/c16_export_multitrack.png" width="800">
To export the data as a C16 file, select Export, Export Audio ... and then select RAW as a 16 bit signed PCM. After saving, change the extension and you will be able to use the file in the Replay app.
<img src="img/c16_export.png" width="600">
As a final note, if you created a new file, be sure that the Project Rate matches your capture:
<img src="img/c16_export2.png" width="300">