Module: PWN::SDR::Decoder::Morse

Defined in:
lib/pwn/sdr/decoder/morse.rb

Overview

Pure-Ruby CW / Morse decoder for the amateur CW sub-bands.

GQRX's CW/USB demodulator produces a ~600–800 Hz sidetone in the 48 kHz UDP audio stream. This module envelope-detects the tone with a state-preserving single-pole low-pass, adaptively thresholds it into on/off runs, classifies each run as dit / dah / char-gap / word-gap by timing, and looks the resulting .- sequences up in DSP::MORSE_TABLE. No multimon-ng, no sox.

Defined Under Namespace

Classes: Demod

Class Method Summary collapse

Class Method Details

.authors ⇒ Object

Author(s)

0day Inc. support@0dayinc.com



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# File 'lib/pwn/sdr/decoder/morse.rb', line 135

public_class_method def self.authors
  "AUTHOR(S):\n  0day Inc. <support@0dayinc.com>\n"
end

.decode(opts = {}) ⇒ Object

Supported Method Parameters

PWN::SDR::Decoder::Morse.decode( freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq' )



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# File 'lib/pwn/sdr/decoder/morse.rb', line 98

public_class_method def self.decode(opts = {})
  freq_obj = opts[:freq_obj]
  # Prefer true-air I/Q (FM-demod → existing audio demod) when the
  # operator asks for a source/file or sets freq_obj[:iq_source].
  # Otherwise keep the GQRX 48 kHz UDP audio path (run_native).
  want_iq = opts[:source] || opts[:file] || freq_obj[:iq_source] || freq_obj[:iq_file]
  if want_iq
    PWN::SDR::Decoder::Base.run_iq(
      freq_obj: freq_obj,
      protocol: 'MORSE-CW',
      demod: Demod.new,
      sample_rate: (opts[:sample_rate] || freq_obj[:iq_rate] || 48_000).to_i,
      source: opts[:source],
      file: opts[:file],
      fm_demod: true,
      note: 'MORSE-CW true-air: FM-demod I/Q then native bit recovery; falls back to detector without SDR hardware.'
    )
  else
    PWN::SDR::Decoder::Base.run_native(
      freq_obj: freq_obj,
      protocol: 'MORSE-CW',
      demod: Demod.new
    )
  end
end

.decode_string(opts = {}) ⇒ Object

Supported Method Parameters

h = PWN::SDR::Decoder::Morse.decode_string(pattern: '.- -...')



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# File 'lib/pwn/sdr/decoder/morse.rb', line 127

public_class_method def self.decode_string(opts = {})
  pattern = opts[:pattern].to_s
  txt = pattern.strip.split(/\s+/).map { |s| PWN::SDR::Decoder::DSP::MORSE_TABLE[s] || '_' }.join
  { protocol: 'MORSE-CW', text: txt, summary: "CW #{txt}" }
end

.help ⇒ Object

Display Usage for this Module



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# File 'lib/pwn/sdr/decoder/morse.rb', line 141

public_class_method def self.help
  puts "USAGE (true-air I/Q + GQRX-audio native paths, no external binaries):
    #{self}.decode(
      freq_obj: 'required - freq_obj returned from PWN::SDR::GQRX.init_freq'
    )

    #{self}.decode_string(pattern: '.- -...')

    #{self}.authors
  "
end