From 5829e2e7a2a4db757a59b184de76df98f5765980 Mon Sep 17 00:00:00 2001 From: Svjatoslav Agejenko Date: Thu, 31 Jul 2025 03:12:02 +0300 Subject: [PATCH] Describe data <-> audio CODEC --- 2D GFX/Fractals/index.html | 40 +- 2D GFX/Spirals/index.html | 54 +-- 2D GFX/Textures/index.html | 34 +- 3D GFX/3D Synthezier/doc/index.html | 162 ++++---- 3D GFX/Miscellaneous/index.html | 54 +-- 3D GFX/Space/index.html | 36 +- Math/Plotting/index.html | 36 +- Math/Simulation/index.html | 64 ++-- Math/Truth table/index.html | 64 ++-- Miscellaneous/Mouse driver/index.html | 30 +- .../index.org | 9 - .../INPUT.TXT | 0 .../OUTPUT.TXT | 0 .../SOUND.XI | Bin .../aver.bas | 16 +- .../Digital data over analog audio/index.html | 350 ++++++++++++++++++ .../Digital data over analog audio/index.org | 92 +++++ .../msg2xi.bas | 1 + .../screenshot.png | Bin .../xi2msg.bas | 1 + Tools/Update web site | 1 + index.org | 17 +- 22 files changed, 755 insertions(+), 306 deletions(-) delete mode 100755 Networking/Digital data over analog audio channel/index.org rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/INPUT.TXT (100%) rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/OUTPUT.TXT (100%) rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/SOUND.XI (100%) rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/aver.bas (68%) create mode 100644 Networking/Digital data over analog audio/index.html create mode 100755 Networking/Digital data over analog audio/index.org rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/msg2xi.bas (99%) rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/screenshot.png (100%) rename Networking/{Digital data over analog audio channel => Digital data over analog audio}/xi2msg.bas (99%) diff --git a/2D GFX/Fractals/index.html b/2D GFX/Fractals/index.html index 14c08e3..9002ff2 100644 --- a/2D GFX/Fractals/index.html +++ b/2D GFX/Fractals/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Fractals @@ -210,11 +210,11 @@

Table of Contents

@@ -236,8 +236,8 @@ -
-

1. Fractal circles

+
+

1. Fractal circles

This QBasic program generates a visually captivating spiral fractal @@ -247,7 +247,7 @@ geometry, recursive programming, and graphical design.

-
+

fractal%20circles.png

@@ -266,8 +266,8 @@ indefinitely.
-
-

2. Fractal circles animated

+
+

2. Fractal circles animated

This QBasic program creates an animated fractal composed of circles, @@ -287,29 +287,29 @@ system to control the animation's progression.

-
-

3. Fractal of squares

+
+

3. Fractal of squares

This QBasic program generates and displays a fractal pattern composed of squares.

-
+

fractal%20squares,%201.png

-
+

fractal%20squares,%202.png

-
-

4. Fractal of squares animated

+
+

4. Fractal of squares animated

This QBasic program generates an animated fractal pattern composed of @@ -331,8 +331,8 @@ resulting in a dynamic and ever-changing geometric pattern.

-
-

5. Fractal of trees

+
+

5. Fractal of trees

QBasic program that generates a visually appealing fractal tree @@ -355,7 +355,7 @@ resembles a tree, with branches that grow and change over time.

-

Created: 2025-07-30 ke 08:54

+

Created: 2025-07-30 ke 12:27

Validate

diff --git a/2D GFX/Spirals/index.html b/2D GFX/Spirals/index.html index 3508025..191b6f8 100644 --- a/2D GFX/Spirals/index.html +++ b/2D GFX/Spirals/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Spiral series @@ -210,12 +210,12 @@

Table of Contents

@@ -236,11 +236,11 @@ } -
-

1. Spiral with increasing density

+
+

1. Spiral with increasing density

-
+

spiral.png

@@ -320,11 +320,11 @@ userInput$ = INPUT$(1)
-
-

2. Spiral with varying height

+
+

2. Spiral with varying height

-
+

spiral, 2.png

@@ -391,11 +391,11 @@ a$ = INPUT$(1)
-
-

3. Shaded spiral

+
+

3. Shaded spiral

-
+

spiral, 3.png

@@ -497,8 +497,8 @@ a$ = INPUT$(1)
-
-

4. Sphere forming spiral

+
+

4. Sphere forming spiral

Similar to previous spiral, Line segments are connected between the @@ -507,7 +507,7 @@ multiple linked spherical shapes. Initially point cloud in shown:

-
+

spiral, 4, 1.png

@@ -517,7 +517,7 @@ In the next step, points are connected using lines:

-
+

spiral, 4, 2.png

@@ -622,11 +622,11 @@ a$ = INPUT$(1)
-
-

5. Textured spherical spiral

+
+

5. Textured spherical spiral

-
+

spiral, 5.png

@@ -749,11 +749,11 @@ a$ = INPUT$(1)
-
-

6. Textured and shaded spherical spiral

+
+

6. Textured and shaded spherical spiral

-
+

spiral, 6.png

@@ -937,7 +937,7 @@ yStep2 = (oppositePointY2 - oppositePointY1) / stepCount
-

Created: 2025-07-30 ke 08:54

+

Created: 2025-07-30 ke 12:27

Validate

diff --git a/2D GFX/Textures/index.html b/2D GFX/Textures/index.html index 913d1b4..850d28f 100644 --- a/2D GFX/Textures/index.html +++ b/2D GFX/Textures/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Algorithmic textures @@ -210,11 +210,11 @@

Table of Contents

@@ -233,8 +233,8 @@ } -
-

1. Circular waves

+
+

1. Circular waves

This QBasic program creates visually captivating circular wave @@ -313,8 +313,8 @@ algorithms can produce intricate and visually appealing results.

-
-

2. Diamond square clouds

+
+

2. Diamond square clouds

This QBasic program demonstrates the Diamond-Square algorithm, a @@ -429,8 +429,8 @@ WAITa$ = INPUT$(1)

-
-

3. Old paper

+
+

3. Old paper

This QBasic program generates a procedural texture that simulates the @@ -527,8 +527,8 @@ inputKey$ = INPUT$(1)

-
-

4. Wood

+
+

4. Wood

This QBasic program creates a visually appealing simulation of a wood @@ -622,8 +622,8 @@ exitKey$ = INPUT$(1)

-
-

5. Yellow flame

+
+

5. Yellow flame

"Yellow Flame" is a visually captivating program written in QBasic @@ -702,7 +702,7 @@ userInput$ = INPUT$(1)

-

Created: 2025-07-30 ke 08:54

+

Created: 2025-07-30 ke 12:27

Validate

diff --git a/3D GFX/3D Synthezier/doc/index.html b/3D GFX/3D Synthezier/doc/index.html index 1e0b353..2042d46 100644 --- a/3D GFX/3D Synthezier/doc/index.html +++ b/3D GFX/3D Synthezier/doc/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + 3D Synthezier @@ -1103,39 +1103,39 @@ hsAddReviewPanels();

Table of Contents

@@ -1157,8 +1157,8 @@ hsAddReviewPanels(); -
-

1. Operating principle

+
+

1. Operating principle

Parses scene definition language and creates 3D world based on @@ -1221,60 +1221,60 @@ They were produced by importing generated -

1.1. Rectangular city

+
+

1.1. Rectangular city

-
+

rectangular city, 1.jpeg

-
+

rectangular city, 2.jpeg

-
+

rectangular city, 3.jpeg

-
-

1.2. Hexagonal city

+
+

1.2. Hexagonal city

-
+

hexagonal city, 1.jpeg

-
+

hexagonal city, 2.jpeg

-
+

hexagonal city, 3.jpeg

-
-

2. Scene description language

+
+

2. Scene description language

See also examples.

-
-

2.1. here

+
+

2.1. here

 here
@@ -1285,8 +1285,8 @@ defines new segment
-
-

2.2. p

+
+

2.2. p

 p  x y z
@@ -1297,8 +1297,8 @@ defines new point
-
-

2.3. f

+
+

2.3. f

 f  p1 p2 p3 p4
@@ -1309,8 +1309,8 @@ defines new polygon,  p4  may be unused
-
-

2.4. warn

+
+

2.4. warn

 warn  <message>
@@ -1321,8 +1321,8 @@ displays warning message, and wait for key
-
-

2.5. end

+
+

2.5. end

 end
@@ -1333,8 +1333,8 @@ terminates parser
-
-

2.6. mtl

+
+

2.6. mtl

 mtl  material
@@ -1345,8 +1345,8 @@ selects material
-
-

2.7. mtlrnd

+
+

2.7. mtlrnd

 mtlrnd  material ...
@@ -1357,8 +1357,8 @@ selects random material from list
-
-

2.8. obj

+
+

2.8. obj

 obj  object xz45 xy20 x+3 y*2
@@ -1373,14 +1373,14 @@ directly from file, and not chached, to allow loading of greater than
 

 
 
-

+

 
rotation.png
-
-

2.9. rnd

+
+

2.9. rnd

 rnd  p^1^2^3 p^7^2^1
@@ -1391,8 +1391,8 @@ select random command to execute, ^ will be converted to spaces.
-
-

2.10. #

+
+

2.10. #

 # whatever text
@@ -1403,8 +1403,8 @@ comment
-
-

2.11. out

+
+

2.11. out

 out  file
@@ -1415,8 +1415,8 @@ specify output file name, must be first command
-
-

2.12. set

+
+

2.12. set

 set  variable  contents
@@ -1428,8 +1428,8 @@ string. max variables is 100. first is 0.
-
-

2.13. variables usage

+
+

2.13. variables usage

 anycommand %1 anything
@@ -1440,8 +1440,8 @@ inserts variable 1 contents info line
-
-

2.14. cmp

+
+

2.14. cmp

 cmp  flag string1 string2
@@ -1452,8 +1452,8 @@ compares strings, and inserts TRUE to flag, if they are equal, else inserts FALS
-
-

2.15. ?

+
+

2.15. ?

 ?flag anycommand
@@ -1468,8 +1468,8 @@ exapmle: ?3 obj car z*2 xy45
-
-

2.16. dum

+
+

2.16. dum

 dum
@@ -1482,16 +1482,16 @@ dummy function, does notheing
-
-

3. Installation

+
+

3. Installation

Edit bin/3dparse.bas file and update include path in there.

-
-

3.1. System requirements

+
+

3.1. System requirements

@@ -1522,8 +1522,8 @@ Edit bin/3dparse.bas file and update include path in there. -
-

3.2. Directory layout

+
+

3.2. Directory layout

bin
@@ -1540,8 +1540,8 @@ Edit bin/3dparse.bas file and update include path in there.
-
-

4. Usage

+
+

4. Usage

Make sure you have QB binaries in your PATH. Execute @@ -1566,7 +1566,7 @@ Visualize scene with your favourite renderer.

-

Created: 2025-07-30 ke 08:55

+

Created: 2025-07-30 ke 12:28

Validate

diff --git a/3D GFX/Miscellaneous/index.html b/3D GFX/Miscellaneous/index.html index 69acd20..5f4e084 100644 --- a/3D GFX/Miscellaneous/index.html +++ b/3D GFX/Miscellaneous/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Miscellaneous 3D graphics demos @@ -210,14 +210,14 @@

Table of Contents

@@ -238,8 +238,8 @@ } -
-

1. Rotating exclamation mark

+
+

1. Rotating exclamation mark

Wireframe 3D model of a rotating exclamation mark. @@ -258,8 +258,8 @@ Wireframe 3D model of a rotating exclamation mark.

-
-

2. 3D bouncing ball

+
+

2. 3D bouncing ball

This QBasic program creates a visually engaging 3D animation of a @@ -280,8 +280,8 @@ of early computer graphics techniques.

-
-

3. 3D text in a room

+
+

3. 3D text in a room

Wireframe 3D text hanging in a wireframe 3D room. User can look and @@ -301,8 +301,8 @@ fly around in all directions.

-
-

4. 3D bouncing cubes on grid floor

+
+

4. 3D bouncing cubes on grid floor

3D wireframe cubes bouncing on a grid floor, creating an immersive and @@ -322,8 +322,8 @@ dynamic visual effect.

-
-

5. Matrix math for rotation in 3D space

+
+

5. Matrix math for rotation in 3D space

Instead of combining simple 2D rotors, pixels in this 3D space are @@ -343,8 +343,8 @@ rotated by using matrix multiplications.

-
-

6. Maze explorer

+
+

6. Maze explorer

The Evolving 3D Maze Explorer is a QBasic program that generates and @@ -355,7 +355,7 @@ changes as they navigate through it.

-
+

Maze%20explorer.png

@@ -366,8 +366,8 @@ changes as they navigate through it.
-
-

7. Tank animation

+
+

7. Tank animation

Animated tank driving through the bridge back and forward. User can @@ -387,8 +387,8 @@ look and fly around in all directions.

-
-

8. Tiled room

+
+

8. Tiled room

Room with some tiles on the wall and on the floor. User can freely fly @@ -409,7 +409,7 @@ around.

-

Created: 2025-07-30 ke 08:55

+

Created: 2025-07-30 ke 12:29

Validate

diff --git a/3D GFX/Space/index.html b/3D GFX/Space/index.html index 7355761..e3257ab 100644 --- a/3D GFX/Space/index.html +++ b/3D GFX/Space/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Space themed 3D graphics @@ -210,10 +210,10 @@

Table of Contents

@@ -234,8 +234,8 @@ } -
-

1. Galaxy explorer

+
+

1. Galaxy explorer

This QBasic program renders a navigable 3D point cloud galaxy, @@ -245,7 +245,7 @@ galaxy with stars distributed in a spiral pattern.

-
+

Galaxy%20explorer.png

@@ -256,8 +256,8 @@ galaxy with stars distributed in a spiral pattern.
-
-

2. Rocket simulator

+
+

2. Rocket simulator

QBasic program that simulates the takeoff and flight of a rocket from @@ -279,8 +279,8 @@ observe the rocket's trajectory from various angles.

-
-

3. Stars

+
+

3. Stars

The 3D Starfield Simulation is a QBasic program that creates a @@ -320,8 +320,8 @@ based on its distance, with closer stars appearing brighter.

-
-

4. Universe explorer

+
+

4. Universe explorer

This QBasic program that simulates a navigable 3D universe. Users can @@ -358,19 +358,19 @@ limiting the number of rendered objects based on distance. -

+

1.png

-
+

2.png

-
+

3.png

@@ -382,7 +382,7 @@ limiting the number of rendered objects based on distance.
-

Created: 2025-07-30 ke 08:56

+

Created: 2025-07-30 ke 12:29

Validate

diff --git a/Math/Plotting/index.html b/Math/Plotting/index.html index ff4d269..29cc33d 100644 --- a/Math/Plotting/index.html +++ b/Math/Plotting/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Plotting @@ -210,10 +210,10 @@

Table of Contents

@@ -234,8 +234,8 @@ } -
-

1. 2D graph

+
+

1. 2D graph

The 2D Graph Plotter is a simple yet effective program written in @@ -251,7 +251,7 @@ based on a user-defined mathematical function.

-
+

2D%20graph%20plot.png

@@ -262,8 +262,8 @@ based on a user-defined mathematical function.
-
-

2. 3D graph

+
+

2. 3D graph

The 3D Heightmap Explorer is a QBasic program designed to visualize @@ -299,7 +299,7 @@ grid.

-
+

3D%20graph.png

@@ -310,8 +310,8 @@ grid.
-
-

3. Deriviative calculator

+
+

3. Deriviative calculator

This QBasic program is designed to compute and plot an arbitrary @@ -324,7 +324,7 @@ visualized.

-
+

Deriviative%20calculator.png

@@ -335,8 +335,8 @@ visualized.
-
-

4. Sine and cosine table

+
+

4. Sine and cosine table

The SIN & COS Table Generator is a QBasic program designed to visually @@ -346,7 +346,7 @@ visual representation of these fundamental trigonometric functions.

-
+

Sine%20and%20cosine%20table.png

@@ -358,7 +358,7 @@ visual representation of these fundamental trigonometric functions.
-

Created: 2025-07-30 ke 08:56

+

Created: 2025-07-30 ke 12:29

Validate

diff --git a/Math/Simulation/index.html b/Math/Simulation/index.html index d446fdb..ead8f08 100644 --- a/Math/Simulation/index.html +++ b/Math/Simulation/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Simulation @@ -210,14 +210,14 @@

Table of Contents

@@ -238,8 +238,8 @@ } -
-

1. Explosion simulator

+
+

1. Explosion simulator

This QBasic program simulates the propagation of shock waves in a gas @@ -265,7 +265,7 @@ conditions by setting velocities to zero at wall boundaries.

-
+

Explosion%20simulator.png

@@ -276,8 +276,8 @@ conditions by setting velocities to zero at wall boundaries.
-
-

2. Gravity in 2D

+
+

2. Gravity in 2D

The Gravitation Simulation program is a simple yet insightful QBasic @@ -289,7 +289,7 @@ educational tool for understanding basic orbital mechanics.

-
+

Gravity%20in%202D.png

@@ -300,8 +300,8 @@ educational tool for understanding basic orbital mechanics.
-
-

3. Gravity in 3D

+
+

3. Gravity in 3D

This QBasic program simulates the gravitational interactions between @@ -335,8 +335,8 @@ will reach stable configuration.

-
-

4. Interference

+
+

4. Interference

This QBasic program simulates the interference pattern created by two @@ -364,8 +364,8 @@ displayed as a third waveform.

-
-

5. Interferogram

+
+

5. Interferogram

This QBasic program simulates the interference pattern created by @@ -375,7 +375,7 @@ used in physics and engineering to analyze wave interactions.

-
+

Interferogram.png

@@ -386,8 +386,8 @@ used in physics and engineering to analyze wave interactions.
-
-

6. Surface tension

+
+

6. Surface tension

This QBasic program simulates the behavior of water spills and the @@ -411,7 +411,7 @@ water cell if surrounded by a high density of water cells.

-
+

Surface%20tension.png

@@ -422,8 +422,8 @@ water cell if surrounded by a high density of water cells.
-
-

7. Wave 1

+
+

7. Wave 1

This QBasic program simulates the propagation of waves across a @@ -439,7 +439,7 @@ loss.

-
+

Wave%201.png

@@ -450,8 +450,8 @@ loss.
-
-

8. Wave 2

+
+

8. Wave 2

This QBasic program simulates and visualizes the behavior of water @@ -463,7 +463,7 @@ understanding wave mechanics.

-
+

Wave%202.png

@@ -475,7 +475,7 @@ understanding wave mechanics.
-

Created: 2025-07-30 ke 08:56

+

Created: 2025-07-30 ke 12:29

Validate

diff --git a/Math/Truth table/index.html b/Math/Truth table/index.html index ca59ad0..44eb04e 100644 --- a/Math/Truth table/index.html +++ b/Math/Truth table/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Truth table calculator @@ -1103,20 +1103,20 @@ hsAddReviewPanels();

Table of Contents

@@ -1133,12 +1133,12 @@ the input variables, with the corresponding output value. Truth tables are cruci designing and understanding digital circuits, Boolean algebra, and logical expressions.

-
-

1. Implemented logical operations

+
+

1. Implemented logical operations

-
-

1.1. Equivalent ( ⇔ , 1 )

+
+

1.1. Equivalent ( ⇔ , 1 )

The equivalent operation, also known as logical biconditional, is true if and only if @@ -1196,8 +1196,8 @@ Truth Table:

-
-

1.2. Implies ( ⇒ , 2 )

+
+

1.2. Implies ( ⇒ , 2 )

An implication asserts that if the first proposition is true, the @@ -1255,8 +1255,8 @@ Truth table:

-
-

1.3. OR ( ∨ , 3 )

+
+

1.3. OR ( ∨ , 3 )

The OR operation, also known as logical disjunction, is true if at @@ -1314,8 +1314,8 @@ Truth table:

-
-

1.4. AND ( ∧ , 4 )

+
+

1.4. AND ( ∧ , 4 )

The AND operation, also known as logical conjunction, is true if and @@ -1372,8 +1372,8 @@ Truth table:

-
-

1.5. NOT ( ¬ , 5 )

+
+

1.5. NOT ( ¬ , 5 )

The NOT operation, also known as logical negation, inverts the value @@ -1414,12 +1414,12 @@ Truth Table:

-
-

2. Examples

+
+

2. Examples

-
-

2.1. Example: (A ∧ B) ∨ ¬C

+
+

2.1. Example: (A ∧ B) ∨ ¬C

@@ -1502,8 +1502,8 @@ Truth Table: -
-

2.2. Example: A ⇒ (B ∨ ¬C)

+
+

2.2. Example: A ⇒ (B ∨ ¬C)

@@ -1586,8 +1586,8 @@ Truth Table: -
-

2.3. Example: (A ⇔ B) ∧ C

+
+

2.3. Example: (A ⇔ B) ∧ C

Truth Table: @@ -1676,7 +1676,7 @@ Truth Table:

-

Created: 2025-07-30 ke 08:57

+

Created: 2025-07-30 ke 12:30

Validate

diff --git a/Miscellaneous/Mouse driver/index.html b/Miscellaneous/Mouse driver/index.html index 678471b..1beacac 100644 --- a/Miscellaneous/Mouse driver/index.html +++ b/Miscellaneous/Mouse driver/index.html @@ -3,7 +3,7 @@ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> - + Mouse driver for QBasic programs @@ -210,16 +210,16 @@

Table of Contents

-
-

1. Overview

+
+

1. Overview

QBasic, a popular programming language in the DOS era, lacks native @@ -230,8 +230,8 @@ workaround that allows QBasic to use mouse input.

-
-

2. High-level idea

+
+

2. High-level idea

Workaround to access mouse involves a Terminate and Stay Resident @@ -264,8 +264,8 @@ TSR keeps updating it with latest mouse state simultaneously.

-
-

3. Terminate and Stay Resident module

+
+

3. Terminate and Stay Resident module

A DOS TSR program that hooks into the system's interrupt mechanism to @@ -351,8 +351,8 @@ meanwhile.

-
-

4. QBasic demonstration program

+
+

4. QBasic demonstration program

A QBasic program that reads mouse data from the memory location @@ -362,7 +362,7 @@ clicks. -

diff --git a/Networking/Digital data over analog audio channel/index.org b/Networking/Digital data over analog audio channel/index.org deleted file mode 100755 index 83bf69b..0000000 --- a/Networking/Digital data over analog audio channel/index.org +++ /dev/null @@ -1,9 +0,0 @@ -* data in sound - -Utility to encode/decode digital information into wave sound file. -You can later record it on the tape or send it acustically or -for example over telephone line. Decoding utility -is petty noise tolerant. - - -[[file:screenshot.png]] diff --git a/Networking/Digital data over analog audio channel/INPUT.TXT b/Networking/Digital data over analog audio/INPUT.TXT similarity index 100% rename from Networking/Digital data over analog audio channel/INPUT.TXT rename to Networking/Digital data over analog audio/INPUT.TXT diff --git a/Networking/Digital data over analog audio channel/OUTPUT.TXT b/Networking/Digital data over analog audio/OUTPUT.TXT similarity index 100% rename from Networking/Digital data over analog audio channel/OUTPUT.TXT rename to Networking/Digital data over analog audio/OUTPUT.TXT diff --git a/Networking/Digital data over analog audio channel/SOUND.XI b/Networking/Digital data over analog audio/SOUND.XI similarity index 100% rename from Networking/Digital data over analog audio channel/SOUND.XI rename to Networking/Digital data over analog audio/SOUND.XI diff --git a/Networking/Digital data over analog audio channel/aver.bas b/Networking/Digital data over analog audio/aver.bas similarity index 68% rename from Networking/Digital data over analog audio channel/aver.bas rename to Networking/Digital data over analog audio/aver.bas index e984ed5..950896f 100644 --- a/Networking/Digital data over analog audio channel/aver.bas +++ b/Networking/Digital data over analog audio/aver.bas @@ -1,9 +1,13 @@ -' Noise reduction -' made by Svjatoslav Agejenko -' in 2003.12 -' H-Page: svjatoslav.eu -' E-Mail: svjatoslav@svjatoslav.eu - +' Utility that reduces high frequency noise/hiss in audio file. +' In some casus it can help when recovering digital data from sound file. +' +' This program is free software: released under Creative Commons Zero (CC0) license +' by Svjatoslav Agejenko. +' Email: svjatoslav@svjatoslav.eu +' Homepage: http://www.svjatoslav.eu +' +' Changelog: +' 2003.12, Initial version DECLARE SUB start () diff --git a/Networking/Digital data over analog audio/index.html b/Networking/Digital data over analog audio/index.html new file mode 100644 index 0000000..337dacc --- /dev/null +++ b/Networking/Digital data over analog audio/index.html @@ -0,0 +1,350 @@ + + + + + + + +Data over analog audio + + + + + + +
+

Data over analog audio

+ + +
+

1. msg2xi: Text to Sound Encoder

+
+

+msg2xi is a utility designed to encode arbitrary text messages into an +8-bit sound file. This program allows users to convert digital data +into analog audio signals, making it possible to transmit text +messages over traditional analog mediums such as telephone lines or +magnetic tapes. +

+ +

+How It Works: The program reads text from an input file, processing +it byte by byte. Each byte is broken down into its constituent bits. +For each bit, a sine wave is generated. Different waveforms represent +'1's and '0's (implementing frequency modulation). The generated +waveforms are combined into a single audio file, encoding the original +text message. A special pure sinewave header tone is added to the +beginning of the audio file to mark the start of the encoded message, +facilitating synchronization during decoding. +

+ +

+Download source code: Source code +

+
+
+ +
+

2. xi2msg: Sound to Text Decoder

+
+

+The xi2msg utility is designed to decode digital information from an +audio file, specifically an 8-bit sound file. This program is part of +a suite of utilities that enable the transmission of digital data over +analog audio mediums, such as telephone lines or magnetic tapes. +

+ +

+The xi2msg utility works by analyzing the audio file to locate peaks +between waveforms. It calculates the distance between these peaks to +determine whether each segment represents a '0' or a '1' bit. This +process involves several key steps: +

+ +
+
Header Detection
The program starts by searching for a special +header tone in the audio file. This header tone marks the beginning +of the encoded message and helps synchronize the decoding process.
+ +
Peak Analysis
The utility measures the distance between peaks in +the audio waveform. Long distances between peaks are interpreted as +'0' bits, while short distances are interpreted as '1' bits.
+ +
Bit Assembly
The detected bits are sequentially assembled into +bytes. Each byte is then converted into its corresponding character.
+ +
Output
The decoded message is displayed on the screen and written +to an output file, making it accessible for further use or analysis.
+
+ +

+The program relies on frequency modulation for decoding data, which +was chosen for its resilience to amplitude distortions that can occur +during analog transmission. This makes the utility particularly +effective for decoding messages recorded on cassette tapes or +transmitted over telephone lines. +

+ + +
+

screenshot.png +

+
+ + +

+Download source code: Source code +

+
+
+ +
+

3. aver

+
+

+The aver.bas utility is designed to reduce noise in digitized audio +files by smoothing out noise peaks, which is particularly beneficial +for audio files transmitted over analog mediums like telephone lines +or magnetic tapes, where noise interference is common. +

+ +

+The program starts by asking the user for two critical factors: the +averaging factor and the divide factor. These parameters determine the +intensity of the noise reduction applied. +

+ +

+For each byte read from the input file, the program stores the last N +values (where N is the averaging factor). These values are averaged, +and the result is scaled by the divide factor. This averaging +technique helps to smooth out noise spikes in the audio data. +

+ +

+The program provides a graphical representation of the original and +smoothed audio. This allows for visual comparison of the original and +processed signals on the screen. The smoothed audio data is written to +an output file, which should have reduced noise compared to the input +file. +

+ +

+The program uses command-line input to determine the filenames for +input and output, defaulting to appending .awe to the input filename +for the output file. +

+ +

+Download source code: Source code +

+
+
+
+
+

Created: 2025-07-31 to 03:01

+

Validate

+
+ + diff --git a/Networking/Digital data over analog audio/index.org b/Networking/Digital data over analog audio/index.org new file mode 100755 index 0000000..17d1b39 --- /dev/null +++ b/Networking/Digital data over analog audio/index.org @@ -0,0 +1,92 @@ +#+TITLE: Data over analog audio +#+LANGUAGE: en +#+LATEX_HEADER: \usepackage[margin=1.0in]{geometry} +#+LATEX_HEADER: \usepackage{parskip} +#+LATEX_HEADER: \usepackage[none]{hyphenat} + +#+OPTIONS: H:20 num:20 +#+OPTIONS: author:nil + +* msg2xi: Text to Sound Encoder + +*msg2xi* is a utility designed to encode arbitrary text messages into an +8-bit sound file. This program allows users to convert digital data +into analog audio signals, making it possible to transmit text +messages over traditional analog mediums such as telephone lines or +magnetic tapes. + +*How It Works:* The program reads text from an input file, processing +it byte by byte. Each byte is broken down into its constituent bits. +For each bit, a sine wave is generated. Different waveforms represent +'1's and '0's (implementing frequency modulation). The generated +waveforms are combined into a single audio file, encoding the original +text message. A special pure sinewave header tone is added to the +beginning of the audio file to mark the start of the encoded message, +facilitating synchronization during decoding. + +Download source code: [[file:msg2xi.bas][Source code]] + +* xi2msg: Sound to Text Decoder + +The *xi2msg* utility is designed to decode digital information from an +audio file, specifically an 8-bit sound file. This program is part of +a suite of utilities that enable the transmission of digital data over +analog audio mediums, such as telephone lines or magnetic tapes. + +The *xi2msg* utility works by analyzing the audio file to locate peaks +between waveforms. It calculates the distance between these peaks to +determine whether each segment represents a '0' or a '1' bit. This +process involves several key steps: + +- Header Detection :: The program starts by searching for a special + header tone in the audio file. This header tone marks the beginning + of the encoded message and helps synchronize the decoding process. + +- Peak Analysis :: The utility measures the distance between peaks in + the audio waveform. Long distances between peaks are interpreted as + '0' bits, while short distances are interpreted as '1' bits. + +- Bit Assembly :: The detected bits are sequentially assembled into + bytes. Each byte is then converted into its corresponding character. + +- Output :: The decoded message is displayed on the screen and written + to an output file, making it accessible for further use or analysis. + +The program relies on frequency modulation for decoding data, which +was chosen for its resilience to amplitude distortions that can occur +during analog transmission. This makes the utility particularly +effective for decoding messages recorded on cassette tapes or +transmitted over telephone lines. + +[[file:screenshot.png]] + + +Download source code: [[file:xi2msg.bas][Source code]] + +* aver + +The *aver.bas* utility is designed to reduce noise in digitized audio +files by smoothing out noise peaks, which is particularly beneficial +for audio files transmitted over analog mediums like telephone lines +or magnetic tapes, where noise interference is common. + +The program starts by asking the user for two critical factors: the +averaging factor and the divide factor. These parameters determine the +intensity of the noise reduction applied. + +For each byte read from the input file, the program stores the last N +values (where N is the averaging factor). These values are averaged, +and the result is scaled by the divide factor. This averaging +technique helps to smooth out noise spikes in the audio data. + +The program provides a graphical representation of the original and +smoothed audio. This allows for visual comparison of the original and +processed signals on the screen. The smoothed audio data is written to +an output file, which should have reduced noise compared to the input +file. + +The program uses command-line input to determine the filenames for +input and output, defaulting to appending .awe to the input filename +for the output file. + +Download source code: [[file:aver.bas][Source code]] diff --git a/Networking/Digital data over analog audio channel/msg2xi.bas b/Networking/Digital data over analog audio/msg2xi.bas similarity index 99% rename from Networking/Digital data over analog audio channel/msg2xi.bas rename to Networking/Digital data over analog audio/msg2xi.bas index 45c1c9b..660304e 100644 --- a/Networking/Digital data over analog audio channel/msg2xi.bas +++ b/Networking/Digital data over analog audio/msg2xi.bas @@ -1,5 +1,6 @@ ' Utility that encodes arbitrary text message into 8 bit sound file. ' This audio can be now transferred over telephone line or recorded to magnetic tape. +' ' This program is free software: released under Creative Commons Zero (CC0) license ' by Svjatoslav Agejenko. ' Email: svjatoslav@svjatoslav.eu diff --git a/Networking/Digital data over analog audio channel/screenshot.png b/Networking/Digital data over analog audio/screenshot.png similarity index 100% rename from Networking/Digital data over analog audio channel/screenshot.png rename to Networking/Digital data over analog audio/screenshot.png diff --git a/Networking/Digital data over analog audio channel/xi2msg.bas b/Networking/Digital data over analog audio/xi2msg.bas similarity index 99% rename from Networking/Digital data over analog audio channel/xi2msg.bas rename to Networking/Digital data over analog audio/xi2msg.bas index caa0b24..bc97e9f 100644 --- a/Networking/Digital data over analog audio channel/xi2msg.bas +++ b/Networking/Digital data over analog audio/xi2msg.bas @@ -1,4 +1,5 @@ ' Utility that decodes text message from 8 bit audio recording. +' ' This program is free software: released under Creative Commons Zero (CC0) license ' by Svjatoslav Agejenko. ' Email: svjatoslav@svjatoslav.eu diff --git a/Tools/Update web site b/Tools/Update web site index cdb8798..acd87ee 100755 --- a/Tools/Update web site +++ b/Tools/Update web site @@ -42,6 +42,7 @@ export_org_to_html "Math/Truth table" export_org_to_html "Miscellaneous/Mouse driver" +export_org_to_html "Networking/Digital data over analog audio" # Upload project homepage to the server. rsync -avz --delete -e 'ssh -p 10006' ./ \ diff --git a/index.org b/index.org index 9666ec6..f7eb122 100644 --- a/index.org +++ b/index.org @@ -1,5 +1,5 @@ #+SETUPFILE: ~/.emacs.d/org-styles/html/darksun.theme -#+TITLE: BASIC applications collection +#+TITLE: BASIC applications collection #+LANGUAGE: en #+LATEX_HEADER: \usepackage[margin=1.0in]{geometry} #+LATEX_HEADER: \usepackage{parskip} @@ -381,7 +381,7 @@ scene is rendered frame by frame.
#+end_export -[[file:Math/Game%20of%20life%20in%203D.bas][Source code]] +Download source code: [[file:Math/Game%20of%20life%20in%203D.bas][Source code]] ** Game of life studio @@ -772,9 +772,7 @@ message. Download source code: [[file:Miscellaneous/Password%20lock/passw.bas][passw.bas]] - * Networking - ** LPT port pin control This QBasic program is designed to control the voltage on individual @@ -796,6 +794,17 @@ The program uses bit manipulation to control individual pins. Download source code: [[file:Networking/LPT%20pin%20control.bas][LPT pin control.bas]] +** Data over analog audio CODEC + +Utilities to encode digital data to sound file and back. + +#+attr_html: :class responsive-img +#+attr_latex: :width 1000px +[[file:Networking/Digital%20data%20over%20analog%20audio/index.html][file:Networking/Digital%20data%20over%20analog%20audio/screenshot.png]] + +[[file:Networking/Digital%20data%20over%20analog%20audio/index.html][Read more]] + + ** Morse This QBasic program allows users to input text and hear it played back -- 2.20.1