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rpitx-app-note
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András Retzler 2015-11-08 14:41:57 +01:00
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@ -15,14 +15,16 @@ Note that it should be already done, if you installed *qtcsdr*.
### Modulate from raw audio file
Generate AM modulation:
cat testsound48000.raw | csdr convert_i16_f | csdr gain_ff 1.0 | csdr dsb_fc | csdr add_dcoffset_cc | sudo rpitx -i- -m IQFLOAT -f 28400
* It will read the raw audio file `testsound48000.raw`, which is present in this repo. You can get this file by:
These examples will use the raw audio file `testsound48000.raw`, which is present in this repo. You can get this file by:
git clone https://github.com/ha7ilm/rpitx-app-note
cd rpitx-app-note; ls #There is your file.
cd rpitx-app-note; ls #There is your file.
A raw audio file differs from a .wav file because it doesn't have any headers to store its parameters, just the samples after each other.
**Generate AM modulation:**
cat testsound48000.raw | csdr convert_i16_f | csdr gain_ff 1.0 | csdr dsb_fc | csdr add_dcoffset_cc | sudo rpitx -i- -m IQFLOAT -f 28400
* The part `csdr gain_ff 1.0` can be changed to increase/decrease modulation.
* The `-f 28400` at the end gives the transmit frequency in kHz.