Claude,
Post by Bill SomervillePost by Claude FrantzWhat is the format of the *.c2 files ? How can they be converted to a
more common format, e.g. using a tool like sox ?
AFAIK it is an internally defined format. The contents are the complex
time domain signal after an initial filter and down sample. It is used
simply to transfer the contents of the Rx sample buffer to the WSPR decoder.
At the moment, I think we’re decoding the .wav file that is written at the end of the period.
Post by Bill SomervilleIt is not meant to be used as an externally readable format although the
wsprd program can read files of that format and produce decodes for a
period.
The advantage of the .c2 file format is that it’s about 1/8 the size of a .wav file. Whereas the .wav files used by wspr represent real-valued samples at 12 kS/s rate, the .c2 file contains complex samples at 375 S/s rate (1/32 of 12 kS/s), corresponding to the complex signal obtained after quadrature-downconverting a slice of the spectrum with bandwidth 375 Hz centered on 1500 Hz.
If you’d like to see examples of how to read and write c2 files, check out the routines in wsprd.c in the development branch wsjtx.
Steve k9an
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