Differences

This shows you the differences between two versions of the page.

--- tanszek:oktatas:techcomm:code [2024/08/27 16:18] – created knehez
+++ tanszek:oktatas:techcomm:code [2024/09/16 13:35] (current) – knehez
@@ Line 1: / Line 1: @@
 ==== Code =====
-The mapping of events to messages is called encoding. Messages are recorded in information storage units. The recorded message itself is an event system. Encoding is a transformation, based on the mutual and unambiguous correspondence between two event systems.
+The mapping of events to messages is called encoding. Messages are recorded in information storage units. The recorded message itself is an //event system//. Encoding is a transformation, based on the mutual and unambiguous correspondence between two event systems.
-The tool of encoding is the code. A code consists of a finite set of symbols (an alphabet), along with coding rules (groups of symbols).
+The tool of encoding is code. A code consists of a finite set of symbols (an alphabet) and coding rules (groups of symbols).
-A codeword is an elementary message, which consists of a finite number of symbols. The set of code symbols and the rules for forming codewords together constitute the syntax of the code.
+A //code-word// is an elementary message, which consists of a finite number of symbols. The code's syntax is the set of code symbols and the rules for forming code-words.
-Encoding changes the form of the information, but other characteristics of the information remain unchanged. There are fixed-length and variable-length codes.
+Encoding changes the information's form, but other information characteristics remain unchanged. There are fixed-length and variable-length codes.
 **Basic Types of Codes:**
@@ Line 24: / Line 24: @@
 $$ N = m^n $$
-The fundamental problem of coding theory is the //preservation//, //security//, and //maximization// of the information content of transmitted messages.
+The fundamental problem of coding theory is the preservation, security, and maximization of the information content of transmitted messages.
+**Morse Code**
+//Morse code// is a method of encoding text characters into sequences of //dots// and //dashes// (or short and long signals) that can be transmitted over telecommunication lines or other mediums like light or sound. It was originally developed in the 1830s by **Samuel Morse** and **Alfred Vail** for use in telegraphy.
+Key features:
+  * **Dot** (.): A short signal or sound.
+  * **Dash** (-): A longer signal or sound, typically three times the duration of a dot.
+  * **Spacing**:
+    * Intra-character space: The space between dots and dashes within a single character (typically silent, as no signal).
+    * Inter-character space: The space between characters (equivalent to three dots).
+    * Inter-word space: The space between words (equivalent to seven dots).
+Examples:
+  * **A**: .- (dot-dash)
+  * **B**: -... (dash-dot-dot-dot)
+  * **C**: -.-. (dash-dot-dash-dot)
+  * **SOS**: ... --- ... (dot-dot-dot, dash-dash-dash, dot-dot-dot) - a universal distress signal.
+Example message:
+  * **HELLO**: .... . .-.. .-.. - - - (dot-dot-dot-dot, dot, dot-dash-dot-dot, dot-dash-dot-dot, dash-dash-dash)