Linux command
rtl_fm 命令
文本
涉及管道、覆盖或删除，执行前请先确认路径和参数。
常用示例
Listen to FM radio
rtl_fm -f [100.1M] -M wbfm -s 200000 -r 48000 | aplay -f S16_LE -r 48000
Narrow FM (ham radio)
rtl_fm -f [145.5M] -M fm -s 12000 | aplay -f S16_LE -r 12000
AM mode
rtl_fm -f [1000k] -M am -s 12000 | aplay -f S16_LE -r 12000
Save to file
rtl_fm -f [100.1M] -M wbfm -s 200000 > [radio.raw]
说明
rtl_fm is an FM demodulator for RTL-SDR dongles. It receives and demodulates radio signals using inexpensive DVB-T USB receivers (based on the RTL2832U chipset) as software-defined radios. Output is raw 16-bit signed PCM audio on stdout, typically piped to an audio player or file.
参数
- -f _freq_
- Center frequency.
- -M _mode_
- Demodulation (fm, wbfm, am, usb, lsb).
- -s _rate_
- Sample rate.
- -r _rate_
- Output sample rate.
- -g _gain_
- Gain (0=auto).
- -d _index_
- Device index.
- -p _ppm_
- PPM frequency error correction for the dongle's crystal oscillator.
- -l _level_
- Squelch level; mute output when signal strength is below this threshold.
- -A _method_
- Output audio filtering: fast (default) or lut (lookup table, slower but slightly better quality).
- -E _option_
- Enable extra features: edge (edge tuning), dc (DC blocking filter), deemp (FM de-emphasis filter), direct (direct sampling mode), offset (offset tuning mode).
FAQ
What is the rtl_fm command used for?
rtl_fm is an FM demodulator for RTL-SDR dongles. It receives and demodulates radio signals using inexpensive DVB-T USB receivers (based on the RTL2832U chipset) as software-defined radios. Output is raw 16-bit signed PCM audio on stdout, typically piped to an audio player or file.
How do I run a basic rtl_fm example?
Run `rtl_fm -f [100.1M] -M wbfm -s 200000 -r 48000 | aplay -f S16_LE -r 48000` in a terminal, then adjust file names, paths, flags, or remote targets for your system.
What does -f _freq_ do in rtl_fm?
Center frequency.