Ryan Malloy
cd3a8cc6be
- sco_mod: 9-channel FM subcarrier oscillator modulator (inverse of sco_demod), with round-trip tests proving voltage recovery across all channels - fm_voice_subcarrier_mod: add audio_input parameter to accept external float streams (e.g., Apollo mission voice recordings) instead of internal test tone - loopback_demo.py: streaming TX->RX round-trip with CLI for noise/voice/frames - agc_loopback_demo.py: full Virtual AGC integration via TCP bridge
77 lines
2.2 KiB
YAML
77 lines
2.2 KiB
YAML
id: apollo_fm_voice_subcarrier_mod
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label: Apollo FM Voice Subcarrier Mod
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: sample_rate
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label: Sample Rate (Hz)
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dtype: real
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default: '5120000'
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- id: subcarrier_freq
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label: Subcarrier Frequency (Hz)
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dtype: real
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default: '1250000'
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- id: fm_deviation
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label: FM Deviation (Hz)
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dtype: real
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default: '29000'
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- id: tone_freq
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label: Test Tone Frequency (Hz)
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dtype: real
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default: '1000'
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- id: audio_input
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label: Audio Source
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dtype: bool
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default: 'False'
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options: ['True', 'False']
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option_labels: ['External Input', 'Internal Test Tone']
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inputs:
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- label: audio
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domain: stream
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dtype: float
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optional: true
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hide: ${ 'all' if not audio_input else 'none' }
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outputs:
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- label: out
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domain: stream
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dtype: float
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templates:
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imports: from apollo.fm_voice_subcarrier_mod import fm_voice_subcarrier_mod
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make: >-
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apollo.fm_voice_subcarrier_mod.fm_voice_subcarrier_mod(
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sample_rate=${sample_rate},
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subcarrier_freq=${subcarrier_freq},
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fm_deviation=${fm_deviation},
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tone_freq=${tone_freq},
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audio_input=${audio_input})
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documentation: |-
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Apollo FM Voice Subcarrier Modulator
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Generates a 1.25 MHz FM subcarrier for the voice channel. Can operate in
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two modes:
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Internal mode (default): Uses a built-in sine test tone as the audio source.
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This is useful for testing and signal validation.
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External mode (audio_input=True): Accepts an external float audio stream as
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input. Use this to modulate actual Apollo mission voice recordings or live
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audio onto the 1.25 MHz FM subcarrier with +/-29 kHz deviation.
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On the real spacecraft, voice audio (300-3000 Hz) drives an FM VCO at
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113 kHz, which is mixed with the 512 kHz master clock and doubled to
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produce the 1.25 MHz FM subcarrier.
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Parameters:
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sample_rate: Output sample rate in Hz (default 5.12 MHz)
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subcarrier_freq: FM subcarrier center frequency in Hz (default 1.25 MHz)
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fm_deviation: FM deviation in Hz (default +/-29 kHz)
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tone_freq: Internal test tone frequency in Hz (default 1 kHz, ignored when audio_input=True)
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audio_input: When True, accept external audio via float input port
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file_format: 1
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