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99 lines
3.0 KiB
Markdown
99 lines
3.0 KiB
Markdown
# FM95 config file
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By default the config file path is on /etc/fm95.conf, it's a ini formatted config consisting of this syntax:
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```ini
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[section]
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key=value
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```
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## Audio Pipeline
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`Pulse` -> `Audio Preamp` -> `AGC` -> `LPF` -> `Pre-Emphasis` -> `Audio Volume` -> `Audio Clipper` -> `Stereo Encoder` -> `BS412` -> `Master Volume` -> `Output Clipper`
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Below are the sections and their keys
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## fm95
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### stereo
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Simple boolean, set to 0, or 1
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### rds_streams
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Integer from 0 to 4, it sets how many channels to capture from RDS95, note that both values have to match, otherwise god may have mercy on your RDS decoders
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### preemphasis
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Sets the Preemphasis tau, basically how much highs is boosted, by default and in Europe it is 50µs, but in the USA and South Korea, use 75µs. Expects unit in integer microseconds
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### calibration
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Simple integer, set to 1 to output a sine wave at 400 Hz, which should correspond to 75 KHz deviation by default. Set to 2 for a 60 Hz square wave, this test is to set the tilt, more on which later
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### master_volume
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Float value to set the master volume, 1 by default, set to 0 to mute MPX
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### audio_preamp
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Pre-amplification of the audio, before any filters, set to 1 by default, set to 0 to mute audio
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### deviation
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Set the deviation, you can use this to easily change to 50 KHz deviation if needed, by default 75 KHz, under the hood it just sets the master volume to x/75000. Expects unit in Hz
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### bs412_max
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This is usually not needed to set, but it sets the max gain for the BS412 compressor, so if it is the default 1, the BS412 compressor will never make the signal louder than it is on the input
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### agc_target
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Target of the AGC, usually not needed to set, defaults to 0.625 (higher is louder)
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### agc_attack
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How fast will the AGC react to the signal going over the target, unit in seconds
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### agc_release
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How fast will the AGC react to the signal going lesser than the target, in seconds
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### agc_min
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Default is 0.1, this is usually not needed, for what it does, see bs412_max, but instead of louder quieter, and not bs412 but agc
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### agc_max
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See agc_min, but its louder not quieter, and the default is 1.5
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### bs412_attack
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See agc_attack, but BS412, not AGC
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### bs412_release
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See bs412_attack, but its release instead
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## advanced
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### lpf_order
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Sets the quality of the LPF, unless running on a weak system, this does not need change from the default 15 (lower is less cpu usage)
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### preemp_unity
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Sets the unity gain for preemphasis, if you don't know what that means you shouldn't touch this, but it defaults to 15 khz, unit in hz
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### sample_rate
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Default 192 khz, does not need change under most systems, and unit is in hz
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### lpf_cutoff
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lpf cutoff, some run this at 15, because Big FM™ tells them to, but running this higher has no costs (unless you're running it above 18.5 khz), but no gains either, unit in hz
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### headroom
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fm95 now computes the volumes for mono and stereo automatically, and headroom is to select how much headroom you want to leave for the mpx, takes a simple float, 1 to mute audio. THIS IS NOT PERCENT
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