skip to content

wiki

User Tools

Log In

Site Tools

Recent Changes
Media Manager
Sitemap

Trace:

rtl-fm

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

====== 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.

<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 · Last modified: 2015-04-26 14:07:03 by 127.0.0.1

Page Tools

Show page
Old revisions
Backlinks
Back to top

Except where otherwise noted, content on this wiki is licensed under the following license: Public Domain