Digital Signal Transmission/Applications for Multimedia Files - Revision history

Maintenance script: Add German interlanguage link

2026-03-16T12:26:38Z

Add German interlanguage link

← Older revision		Revision as of 14:26, 16 March 2026
Line 182:		Line 182:

	{{Display}}		{{Display}}
			[[de:Digitalsignalübertragung/Anwendungen_bei_Multimedia–Dateien]]

Maintenance script: Update domain links: en.lntwww.de → en.lntwww.lnt.ei.tum.de, www.lntwww.de → lntwww.lnt.ei.tum.de

2026-03-16T11:09:48Z

Update domain links: en.lntwww.de → en.lntwww.lnt.ei.tum.de, www.lntwww.de → lntwww.lnt.ei.tum.de

← Older revision		Revision as of 13:09, 16 March 2026
Line 170:		Line 170:

	''Note'':   All ( falsified ) BMP images and WAV audios for this chapter were generated with the Windows program "Digital Channel Models & Multimedia" from the (former) practical course "Simulation of Digital Transmission Systems" at the Chair of Communications Engineering of the TU Munich. The following links provide:		''Note'':   All ( falsified ) BMP images and WAV audios for this chapter were generated with the Windows program "Digital Channel Models & Multimedia" from the (former) practical course "Simulation of Digital Transmission Systems" at the Chair of Communications Engineering of the TU Munich. The following links provide:
	*the Windows program  [~~http~~://en.lntwww.de/downloads/Sonstiges/Programme/DKM.zip DKM]   ⇒   link refers to the ZIP version of the program; and		*the Windows program  [https://en.lntwww.lnt.ei.tum.de/downloads/Sonstiges/Programme/DKM.zip DKM]   ⇒   link refers to the ZIP version of the program; and
	*the corresponding  [~~http~~://en.lntwww.de/downloads/Sonstiges/Texte/Digitale_Kanalmodelle.pdf lab manual]   ⇒   link refers to the PDF version.		*the corresponding  [https://en.lntwww.lnt.ei.tum.de/downloads/Sonstiges/Texte/Digitale_Kanalmodelle.pdf lab manual]   ⇒   link refers to the PDF version.

Guenter at 11:54, 17 April 2023

2023-04-17T11:54:11Z

← Older revision		Revision as of 13:54, 17 April 2023
Line 114:		Line 114:
	<br clear=all>		<br clear=all>
	For the four right images, transmission errors with the (average) error probability  $p_{\rm M} = 1\%$  are considered in each case. One recognizes:		For the four right images, transmission errors with the (average) error probability  $p_{\rm M} = 1\%$  are considered in each case. One recognizes:
	[[File:EN_Dig_T_5_4_S4.png\|right\|frame\|Influence of burst errors on BMP files ~~'''KORREKTUR: bzw.'''~~\|class=fit]]		[[File:EN_Dig_T_5_4_S4.png\|right\|frame\|Influence of burst errors on BMP files\|class=fit]]

	*The errors in image  $\rm B$  are statistically independent and were generated according to the  [[Digital_Signal_Transmission/Binary_Symmetric_Channel_(BSC)\|"BSC model"]].  They are randomly distributed over the whole image area.<br>		*The errors in image  $\rm B$  are statistically independent and were generated according to the  [[Digital_Signal_Transmission/Binary_Symmetric_Channel_(BSC)\|"BSC model"]].  They are randomly distributed over the whole image area.<br>

Guenter at 10:21, 5 April 2023

2023-04-05T10:21:20Z

← Older revision		Revision as of 12:21, 5 April 2023
Line 11:		Line 11:

	Essential properties of BMP images are:		Essential properties of BMP images are:
	*A bitmap is a matrix of pixels, whose individual elements are also called pixels  $($"picture ~~Elements~~"$)$. The pixels are stored line by line, from bottom right to top left.<br>		*A bitmap is a matrix of pixels, whose individual elements are also called pixels  $($"picture elements"$)$. The pixels are stored line by line, from bottom right to top left.<br>

	*Each pixel is also assigned an RGB color value from the additive primary colors  "$\rm r$ed",  "$\rm g$reen"  and  "$\rm b$lue".   The larger the color value can be, the finer the colors to be displayed can be graded.<br>		*Each pixel is also assigned an RGB color value from the additive primary colors  "$\rm r$ed",  "$\rm g$reen"  and  "$\rm b$lue".   The larger the color value can be, the finer the colors to be displayed can be graded.<br>

Guenter at 10:21, 5 April 2023

2023-04-05T10:21:01Z

← Older revision		Revision as of 12:21, 5 April 2023
Line 11:		Line 11:

	Essential properties of BMP images are:		Essential properties of BMP images are:
	*A bitmap is a matrix of pixels, whose individual elements are also called pixels ~~(<i>Picture Elements</i>~~ ). The pixels are stored line by line, from bottom right to top left.<br>		*A bitmap is a matrix of pixels, whose individual elements are also called pixels  $($"picture Elements"$)$. The pixels are stored line by line, from bottom right to top left.<br>

	*Each pixel is also assigned an RGB color value from the additive primary colors  "$\rm r$ed",  "$\rm g$reen"  and  "$\rm b$lue".   The larger the color value can be, the finer the colors to be displayed can be graded.<br>		*Each pixel is also assigned an RGB color value from the additive primary colors  "$\rm r$ed",  "$\rm g$reen"  and  "$\rm b$lue".   The larger the color value can be, the finer the colors to be displayed can be graded.<br>

Guenter at 10:19, 5 April 2023

2023-04-05T10:19:47Z

← Older revision		Revision as of 12:19, 5 April 2023
Line 73:		Line 73:
	A series of images is used to illustrate the effects of transmission errors within the file header (0x00 ... 0x0D) and information block (0x0E ... 0x35). The left figure shows the hexadecimal dump of the falsified file compared to the original file (right).<br>		A series of images is used to illustrate the effects of transmission errors within the file header (0x00 ... 0x0D) and information block (0x0E ... 0x35). The left figure shows the hexadecimal dump of the falsified file compared to the original file (right).<br>

	[[File:~~EN_Dig_T_5_4_S2a_v2~~.png\|center\|frame\|Hexdumps of the falsified file and the original file ~~'''KORREKTUR: falsified'''~~\|class=fit]]		[[File:EN_Dig_T_5_4_S2a_v3.png\|center\|frame\|Hexdumps of the falsified file and the original file\|class=fit]]

	Below you can see the images that result when the five error blocks are successively corrected:		Below you can see the images that result when the five error blocks are successively corrected:

Guenter at 12:27, 19 October 2022

2022-10-19T12:27:48Z

← Older revision		Revision as of 14:27, 19 October 2022
Line 8:		Line 8:
	== Images in BMP format ==		== Images in BMP format ==
	<br>		<br>
	One of the oldest image formats is the so-called  '''bitmap format'''. Corresponding files are marked with the extension "bmp".		One of the oldest image formats is the so-called  "'''bitmap format'''".  Corresponding files are marked with the extension "bmp".

	Essential properties of BMP images are:		Essential properties of BMP images are:

Hwang at 12:31, 18 October 2022

2022-10-18T12:31:05Z

← Older revision		Revision as of 14:31, 18 October 2022
Line 114:		Line 114:
	<br clear=all>		<br clear=all>
	For the four right images, transmission errors with the (average) error probability  $p_{\rm M} = 1\%$  are considered in each case. One recognizes:		For the four right images, transmission errors with the (average) error probability  $p_{\rm M} = 1\%$  are considered in each case. One recognizes:
	[[File:EN_Dig_T_5_4_S4.png\|right\|frame\|Influence of burst errors on BMP files\|class=fit]]		[[File:EN_Dig_T_5_4_S4.png\|right\|frame\|Influence of burst errors on BMP files '''KORREKTUR: bzw.'''\|class=fit]]

	*The errors in image  $\rm B$  are statistically independent and were generated according to the  [[Digital_Signal_Transmission/Binary_Symmetric_Channel_(BSC)\|"BSC model"]].  They are randomly distributed over the whole image area.<br>		*The errors in image  $\rm B$  are statistically independent and were generated according to the  [[Digital_Signal_Transmission/Binary_Symmetric_Channel_(BSC)\|"BSC model"]].  They are randomly distributed over the whole image area.<br>

Hwang at 12:26, 18 October 2022

2022-10-18T12:26:11Z

← Older revision		Revision as of 14:26, 18 October 2022
Line 73:		Line 73:
	A series of images is used to illustrate the effects of transmission errors within the file header (0x00 ... 0x0D) and information block (0x0E ... 0x35). The left figure shows the hexadecimal dump of the falsified file compared to the original file (right).<br>		A series of images is used to illustrate the effects of transmission errors within the file header (0x00 ... 0x0D) and information block (0x0E ... 0x35). The left figure shows the hexadecimal dump of the falsified file compared to the original file (right).<br>

	[[File:EN_Dig_T_5_4_S2a_v2.png\|center\|frame\|Hexdumps of the falsified file and the original file\|class=fit]]		[[File:EN_Dig_T_5_4_S2a_v2.png\|center\|frame\|Hexdumps of the falsified file and the original file '''KORREKTUR: falsified'''\|class=fit]]

	Below you can see the images that result when the five error blocks are successively corrected:		Below you can see the images that result when the five error blocks are successively corrected:

Hwang at 12:22, 18 October 2022

2022-10-18T12:22:49Z

← Older revision		Revision as of 14:22, 18 October 2022
Line 57:		Line 57:
	*0x22 ... 0x25 (4 bytes)   Size of bitmap in bytes:   0x 02 DE 62   ⇒   188002d,<br>		*0x22 ... 0x25 (4 bytes)   Size of bitmap in bytes:   0x 02 DE 62   ⇒   188002d,<br>

	*0x26 ... 0x29 (4 ~~Byte~~)   Horizontal resolution in pixels/meter:   0x 26 70   ⇒   9840d,<br>		*0x26 ... 0x29 (4 bytes)   Horizontal resolution in pixels/meter:   0x 26 70   ⇒   9840d,<br>

	*0x2A ... 0x2D (4 ~~Byte~~)  Vertical resolution in pixels/meter:       0x 26 70   ⇒   9840d,<br>		*0x2A ... 0x2D (4 bytes)  Vertical resolution in pixels/meter:       0x 26 70   ⇒   9840d,<br>

	*0x2E ... 0x31 (4 ~~Byte~~)   Number of colors used,<br>		*0x2E ... 0x31 (4 bytes)   Number of colors used,<br>

	*0x32 ... 0x35 (4 ~~Byte~~)   Number of important colors.<br><br>		*0x32 ... 0x35 (4 bytes)   Number of important colors.<br><br>

	Then the '''image data area''' begins with "0x 43 2A 23" (in the example three bytes per pixel each for R – G – B). Since also here (with the Intel processor) the <i>little–endian byte order</i> applies, these entries designate the color values  $\rm R = 23$,  $\rm G = 2A$,  $\rm B = 43$  (in each case hexadecimal) or   $\rm R = 35$,  $\rm G = 42$,  $\rm B = 67$  (decimal) .<br>		Then the '''image data area''' begins with "0x 43 2A 23" (in the example three bytes per pixel each for R – G – B). Since also here (with the Intel processor) the <i>little–endian byte order</i> applies, these entries designate the color values  $\rm R = 23$,  $\rm G = 2A$,  $\rm B = 43$  (in each case hexadecimal) or   $\rm R = 35$,  $\rm G = 42$,  $\rm B = 67$  (decimal) .<br>