mirror of
https://github.com/radio95-rnt/fm95.git
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37 lines
1023 B
Markdown
37 lines
1023 B
Markdown
# fm95
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FM95 is a audio processor for FM, it does:
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- Pre-Emphasis
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- Stereo
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- Polar Stereo
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- SCA
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Supports these inputs:
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- Audio (via Pulse)
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- MPX (via Pulse)
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- RDS (via Pulse, expects unmodulated RDS, stereo, left channel on 57 KHz, right on 66.5)
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- SCA (via Pulse)
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and one output:
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- MPX (via Pulse)
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# How to compile?
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To compile you need `cmake` and `libpulse-dev`, if you have those then do these commands:
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```
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mkdir build
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cd build
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cmake ..
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make
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```
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Done!
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# CPU Usage?
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Should run completly fine on a pi 5, right now with the preemp, on a pi 3b, its 32%
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# Recommendations
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use a lpf, for example swh-plugins's lowpass_iir, for example:
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```
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pactl load-module module-null-sink sink_name=FM_Audio rate=48000 # this goes to fm95
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pactl load-module module-ladspa-sink sink_name=FM_Audio_lpf sink_master=FM_Audio plugin=lowpass_iir_1891 label=lowpass_iir control=15000,6 rate=48000 # use 4 poles minimum
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pactl load-module module-loopback source=radio_audio.monitor sink=FM_Audio_lpf rate=48000 # from the apps to the filter
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``` |