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42 lines
1019 B
Markdown
42 lines
1019 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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- Low Pass Filter
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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, basically passthrough, i don't recommend this unless you have something else than rds or sca to modulate)
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- RDS (via Pulse, expects unmodulated RDS, stereo, left channel on 57 KHz, right on 66.5, rds95 is recommended here, in modulation this is inphase to the pilot)
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- SCA (via Pulse, by default on 67 khz with a 7 khz deviation)
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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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```bash
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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 and rds2, on a pi 3b, its 50-70% (without lpf its more like 25%-27%)
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## Other Apps
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FM95 also includes some other apps, such as chimer95 which generates GTS tones each half hour, and dcf95 which creates a DCF77 compatible signal
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