rtl-fm
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| + | ====== rtl_fm and proper audio bandlimiting ====== | ||
| + | rtl_fm does not properly limit audio before downsampling. You will hear annoying pitch when you set lower audio rate (e.g. 24k or 16k) - it's the aliased pilot tone. But what if you can't afford 48k audio rate, for example because you are saving the stream to a small memory card? Try proper resampling with sox. | ||
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| + | <code>rtl_fm -f 99700k -p 1 -M fm -s 144k -r 48000 -E deemp | | ||
| + | sox -t raw -r 48000 -e signed-integer -b 16 -c 1 - -t raw - vol 6 dB rate -m 16000 | | ||
| + | aplay -r 16000 -f S16_LE -c 1</code> | ||
rtl-fm.txt ยท Last modified: 2015-04-26 14:07:03 (external edit)
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