Recording FM Radio

A good audio source is of course your local radio stations. Sometimes, however, I want to listen to shows at a time other than when they are broadcast.

Using an FM radio tuner on the computer, you can capture the audio from the radio signal and save it to a sound file, such as MP3.

I’m using the DLink DSB-R100 tuner. It is a small FM radio which connects to the PC using USB for the tuning commands and the sound card’s line-in connector for the audio.

The DSB-R100 has a driver already included in the Linux 2.4 kernel, using the V4L video-for-Linux system.

I’m using the fmtools software for Linux to select stations, with my own recording script. I created a script combining sox to record and lame to encode to MP3.

Since FM radio is limited in bandwidth to 15Khz, the compression can be improved a little by having the sound software do some filtering to match. This is the –lowpass option in lame.

Links:

  1. Linux radio timeshift how-to by Todd Veldhuizen. My script is similar in structure to the example provided by him.
  2. Gary Burd’s fmcapture with software.
  3. Linux Gazette article

Submitted by amillar on Tue, 2004-10-19 15:41

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