INTERNATIONAL MORSE TELEGRAPHY, PARIS CALIBRATION & CONTINUOUS WAVE (CW)
Technical specifications for ITU-R M.1677-1 timing ratios, Web Audio API sinusoidal synthesis, and airgapped client privacy.
1. Timing Proportions & The "PARIS" Standard
Standardized globally by the International Telecommunication Union (ITU-R M.1677-1), Morse code is a rhythmic binary stream where all temporal durations derive from a single unit dot (dit):
- Dit Duration (1 Unit): The foundational time atom. At 20 WPM, 1 unit equals exactly 60 milliseconds.
- Dah Duration (3 Units): Exactly three times the duration of a single dit.
- Intra-Character Space (1 Unit): Silence separating dits and dahs within the same character.
- Inter-Character Space (3 Units): Silence separating consecutive letters.
- Word Space (7 Units): Silence separating distinct words (represented by forward slash
/in raw text).
Transmission speed is calibrated against the international test word "PARIS ", which contains exactly 50 elemental units: Unit Duration (ms) = 1200 / WPM.
2. Web Audio API Sinusoidal Modulation
Unlike legacy web applications using static audio files, this tool leverages native browser AudioContext oscillators. Carrier waves are generated as pure mathematical sine tones with an exponential gain envelope to eliminate high-frequency acoustic key-clicks.