733fe76ed5
Increase fft_size from 512 (default) to 2048 for better NFM channel isolation, and add squelch_snr_threshold = 15.0 dB per channel to reject noise-triggered recordings. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
18 lines
890 B
Markdown
18 lines
890 B
Markdown
### Requirement: FFT size configured for NFM channel isolation
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The system SHALL use an `fft_size` of 2048 or greater to provide sufficient spectral resolution for separating NFM channels spaced 10 kHz apart.
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#### Scenario: FFT size set in config
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- **WHEN** the RTLSDR-Airband configuration is loaded
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- **THEN** the `fft_size` is set to 2048
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### Requirement: Squelch SNR threshold configured per channel
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Each monitored channel SHALL have a `squelch_snr_threshold` set to reduce false triggers from noise and weak signals.
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#### Scenario: Squelch threshold applied
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- **WHEN** a signal is detected on a monitored channel
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- **THEN** the squelch only opens if the signal exceeds the configured SNR threshold (starting value: 15.0 dB)
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#### Scenario: Noise below threshold is rejected
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- **WHEN** noise or interference is present but below the SNR threshold
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- **THEN** no recording is triggered
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