ua1zbe
/
dsd-fme
mirror of https://github.com/lwvmobile/dsd-fme.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Update Example_Usage.md 

Add example for recording 48k/1 audio with rtl_fm
This commit is contained in:
LZ2DMV 2024-03-14 22:47:29 +02:00 committed by GitHub
parent f1088e9471
commit d614eb088e
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 17 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
examples/Example_Usage.md
View File

@ -272,4 +272,20 @@ Note: --buffer option in play is calculated by (channels * samples * sizeof(samp
where samples is 160 for mono, 320 for stereo, and short samples are 2 and float samples are 4.
This is vital to prevent 'lag' or cut-off audio when the UDP audio doesn't fill the default buffer size.
Note2: Be sure to start the receiving end AFTER starting DSD-FME. If DSD-FME is restarted, make sure to restart the receiving end as well, as socat/UDP closes the UDP port listening when DSD-FME closes the UDP socket.
Note2: Be sure to start the receiving end AFTER starting DSD-FME. If DSD-FME is restarted, make sure to restart the receiving end as well, as socat/UDP closes the UDP port listening when DSD-FME closes the UDP socket.
## Record 48k/1 audio with rtl_fm
You can record suitable audio to feed as input to dsd-fme with `-i` using rtl_fm:
`rtl_fm -M nfm -f [FREQ] -s 48k -g 42 -l 20 > input.wav`
You can also combine that with `socat` to send the audio to a remote dsd-fme instance in real time while keeping a local copy on the host where the RTL-SDR dongle is:
`rtl_fm -M fm -f [FREQ] -s 48k -g 42 -l 20 | tee input.wav | socat -u - TCP-LISTEN:1234,forever,reuseaddr`
On the remote side where dsd-fme is, use the TCP input:
`dsd-fme -i tcp:192.168.7.8:1234 -N`
Note: As always, when using rtl_fm, play with `-l` and `-g` to find a good squelch and gain values for your environment - you will know if the squelch is the right value when `input.wav` does not increase in size in the absence of useful signal on the monitored frequency.