Ryan Malloy
7d48398551
FM mode now has the same three-layer architecture as PM mode: - fm_mod/fm_demod for carrier-level FM modulation - fm_signal_source/fm_downlink_receiver convenience wrappers - fm_loopback_demo.py verifying round-trip SCO voltage recovery Includes GRC YAML for all 4 blocks and doc updates across blocks reference, SCO guide, and signal architecture pages.
49 lines
1.1 KiB
YAML
49 lines
1.1 KiB
YAML
id: apollo_fm_demod
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label: Apollo FM Demod
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: carrier_pll_bw
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label: Carrier PLL Bandwidth
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dtype: real
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default: '0.02'
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- id: fm_deviation_hz
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label: FM Deviation (Hz)
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dtype: real
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default: '500000'
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- id: sample_rate
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label: Sample Rate
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dtype: real
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default: '5120000'
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inputs:
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- label: in
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domain: stream
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dtype: complex
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outputs:
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- label: out
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domain: stream
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dtype: float
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templates:
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imports: from apollo.fm_demod import fm_demod
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make: apollo.fm_demod.fm_demod(carrier_pll_bw=${carrier_pll_bw}, fm_deviation_hz=${fm_deviation_hz}, sample_rate=${sample_rate})
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documentation: |-
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Apollo FM Demodulator
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Extracts frequency modulation from complex baseband signal.
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Uses a carrier tracking PLL followed by quadrature demodulation
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to recover the instantaneous frequency (composite SCO signal).
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Output is normalized so +/- full FM deviation maps to +/- 1.0.
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Parameters:
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carrier_pll_bw: PLL loop bandwidth in rad/sample (default 0.02)
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fm_deviation_hz: Expected max FM deviation in Hz (default 500 kHz)
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sample_rate: Input sample rate in Hz (default 5.12 MHz)
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file_format: 1
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