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== Beschreibung == | == Beschreibung == | ||
Downsamples iq input, e.g. to extract Hamradio band from raw SDR input with more bandwidth. | |||
This tool is used at the SDR-Buffer <br> | This tool is used at the SDR-Buffer <br> | ||
https://wiki.oevsv.at/wiki/SDR-Buffer <br> | https://wiki.oevsv.at/wiki/SDR-Buffer <br> | ||
https://websdr.iks.tugraz.at/sdrbuffer/ | https://websdr.iks.tugraz.at/sdrbuffer/ | ||
Beispiel: | |||
./downsample_x64 -a 0.1709 -F u8 -f u8 -i /dev/stdin -l 64 -o /dev/stdout -r 0.1709 | |||
Downsamples 2.048 MHz bandwidth to 350kHz <br> | |||
-l and -a are used against aliasing effects. <br> | |||
-s is necessary if not the center of the spectrum should be used. | |||
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downsample -h | downsample -h | ||
shift frequency and downsample iq-file | shift frequency and up/downsample iq-file | ||
-a <aliasingfilter> manual set antialiasing filter 0.0..1.0 else automatic | -a <aliasingfilter> manual set antialiasing filter 0.0..1.0 else automatic | ||
-F <input format> u8 i16 f32 (u8) | -F <input format> u8 i16 f32 (u8) | ||
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-r <ratio> output to input sampelrate 0.02..5.0 (1.0) | -r <ratio> output to input sampelrate 0.02..5.0 (1.0) | ||
-s <shift> shift frequency before resample -0.5..0.5 of iq rate (0.0) | -s <shift> shift frequency before resample -0.5..0.5 of iq rate (0.0) | ||
-v <cnt> show output level, overdrives on stderr every <cnt> output sample (0) | |||
</nowiki> | </nowiki> | ||
Aktuelle Version vom 11. September 2022, 18:18 Uhr
Beschreibung
Downsamples iq input, e.g. to extract Hamradio band from raw SDR input with more bandwidth.
This tool is used at the SDR-Buffer
https://wiki.oevsv.at/wiki/SDR-Buffer
https://websdr.iks.tugraz.at/sdrbuffer/
Beispiel: ./downsample_x64 -a 0.1709 -F u8 -f u8 -i /dev/stdin -l 64 -o /dev/stdout -r 0.1709
Downsamples 2.048 MHz bandwidth to 350kHz
-l and -a are used against aliasing effects.
-s is necessary if not the center of the spectrum should be used.
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Übersicht der Parameter
downsample -h shift frequency and up/downsample iq-file -a <aliasingfilter> manual set antialiasing filter 0.0..1.0 else automatic -F <input format> u8 i16 f32 (u8) -f <output format> u8 i16 f32 (u8) -g <factor> gain (1.0) -h -i <infile> iq file -l <fir length> fir length 4..4096 with linear more cpu usage (64) -o <outfile> iq file -r <ratio> output to input sampelrate 0.02..5.0 (1.0) -s <shift> shift frequency before resample -0.5..0.5 of iq rate (0.0) -v <cnt> show output level, overdrives on stderr every <cnt> output sample (0)