Communication & Audio5 min read•Updated 2026-09-07
How to Read, Write & Hear Morse Code: Complete Translation & Audio Guide
Master dots, dashes, transmission timing standards, and listen to real-time 650Hz audio telegraph beeps in your browser.
MX
MultiToolX Technical Team
Audio & Communications Engineering
Key Takeaways
- Morse code represents letters using sequences of short signals ('dits' or '.') and long signals ('dahs' or '-').
- Standard PARIS timing: 1 dah equals 3 dits; pauses between letters equal 3 dits; pauses between words equal 7 dits.
- The universal emergency distress signal SOS is written as '... --- ...' without inter-character pauses.
- MultiToolX generates authentic 650 Hz telegraph sine-wave audio directly in your browser using the Web Audio API.
Live Interactive Tool
Morse Code Translator & Audio Player
Use this tool directly below without leaving the guide. 100% free & in-browser.
1. The Standard Timing Rules of Morse Code
Standardized by the International Telecommunication Union (ITU-R M.1677), Morse code timing is strictly proportional to the duration of a single dit (.):
- Dit duration = 1 time unit (t).
- Dah duration = 3 time units (3t).
- Silence between dits and dahs in the same character = 1 time unit (t).
- Silence between distinct letters = 3 time units (3t).
- Silence between words (represented as /) = 7 time units (7t).
2. The Story Behind the Universal SOS Signal
Adopted under the 1906 International Radio Telegraphic Convention in Berlin, SOS was chosen not as an acronym for 'Save Our Souls' or 'Save Our Ship', but because of its unmistakable continuous rhythm:
Three dits, three dahs, three dits: (... --- ...).
It is simple, distinct, and easily recognized even through intense atmospheric static.
Frequently Asked Questions
What audio frequency is typically used for Morse code training?
Tones between 600 Hz and 750 Hz are standard because human hearing is most sensitive to pitch distinctions in this frequency band.
Is Morse code still used in modern aviation and maritime?
While satellite communications (GMDSS) replaced Morse code for official maritime distress in 1999, navigational beacons (VORs and NDBs) still transmit their 3-letter station IDs in Morse code continuously.
Ready to use Morse Code Translator & Audio Player?
Fast, 100% private, client-side processing. No account, no watermark, completely free.