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make wfm deemphasis tau configurable

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This commit is contained in:
Jakob Ketterl 2020-10-04 21:56:35 +02:00
parent 1faa61ad50
commit 9f17f1bc17
2 changed files with 9 additions and 0 deletions
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7
config_webrx.py
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@ -82,6 +82,13 @@ fft_voverlap_factor = (
audio_compression = "adpcm" # valid values: "adpcm", "none" audio_compression = "adpcm" # valid values: "adpcm", "none"
fft_compression = "adpcm" # valid values: "adpcm", "none" fft_compression = "adpcm" # valid values: "adpcm", "none"
# Tau setting for WFM (broadcast FM) deemphasis\
# Quote from wikipedia https://en.wikipedia.org/wiki/FM_broadcasting#Pre-emphasis_and_de-emphasis
# "In most of the world a 50 µs time constant is used. In the Americas and South Korea, 75 µs is used"
# Enable one of the following lines, depending on your location:
# wfm_deemphasis_tau = 75e-6 # for US and South Korea
wfm_deemphasis_tau = 50e-6 # for the rest of the world
digimodes_enable = True # Decoding digimodes come with higher CPU usage. digimodes_enable = True # Decoding digimodes come with higher CPU usage.
digimodes_fft_size = 2048 digimodes_fft_size = 2048

2
owrx/dsp.py
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@ -55,6 +55,7 @@ class DspManager(csdr.output, SdrSourceEventClient):
"center_freq", "center_freq",
"start_mod", "start_mod",
"start_freq", "start_freq",
"wfm_deemphasis_tau",
)) ))
self.dsp = csdr.dsp(self) self.dsp = csdr.dsp(self)
@ -105,6 +106,7 @@ class DspManager(csdr.output, SdrSourceEventClient):
self.props.wireProperty("digital_voice_unvoiced_quality", self.dsp.set_unvoiced_quality), self.props.wireProperty("digital_voice_unvoiced_quality", self.dsp.set_unvoiced_quality),
self.props.wireProperty("dmr_filter", self.dsp.set_dmr_filter), self.props.wireProperty("dmr_filter", self.dsp.set_dmr_filter),
self.props.wireProperty("temporary_directory", self.dsp.set_temporary_directory), self.props.wireProperty("temporary_directory", self.dsp.set_temporary_directory),
self.props.wireProperty("wfm_deemphasis_tau", self.dsp.set_wfm_deemphasis_tau),
self.props.filter("center_freq", "offset_freq").wire(set_dial_freq), self.props.filter("center_freq", "offset_freq").wire(set_dial_freq),
] ]