Introduction on DAB/DAB+ - Revision history

Andimik at 20:35, 23 July 2018

2018-07-23T20:35:25Z

Andimik: /* Step-by-step */ Wrong link

2018-07-23T19:57:34Z

Step-by-step: Wrong link

Andimik: /* Introduction */ Added the word ensemble and hint for similar devices

2018-07-23T19:56:41Z

Introduction: Added the word ensemble and hint for similar devices

Hb9egm: add guide

2015-02-05T20:31:21Z

add guide

Hb9egm: Update Introduction and add step-by-step

2014-11-25T17:51:27Z

Update Introduction and add step-by-step

Hb9egm: Add B200 to list of supported USRPs

2014-11-16T10:02:17Z

Add B200 to list of supported USRPs

Hb9egm at 18:34, 9 July 2014

2014-07-09T18:34:30Z

Hb9egm at 10:08, 14 March 2014

2014-03-14T10:08:17Z

Hb9egm at 14:27, 10 February 2014

2014-02-10T14:27:19Z

Hb9egm at 14:26, 10 February 2014

2014-02-10T14:26:50Z

@@ Line 2: / Line 2: @@
 DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It's based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in the VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programmes, called a multiplex or ensemble. The system has been designed for mobile use and is robust up to 300km/h.
-With the development of the '''mmbTools''' by [http://mmbtools.crc.ca CRC] and opendigitalradio, it is now possible to run a full transmission infrastructure on a laptop running linux and using a [http://en.wikipedia.org/wiki/USRP USRP] as [[RF]] hardware (with [[wikipedia:gnuradio|gnuradio]]) or any other similar device.
+With the development of the '''mmbTools''' by [http://mmbtools.crc.ca CRC] and opendigitalradio, it is now possible to run a full transmission infrastructure on a laptop running Linux and using a [http://en.wikipedia.org/wiki/USRP USRP] as [[RF]] hardware (with [[wikipedia:gnuradio|gnuradio]]) or any other similar device.
 The transmission chain can be divided in 4 parts:
 *The '''Encoder''' encodes the audio source to [[wikipedia:MPEG-1 Audio Layer II|MPEG-2 Layer II]] for DAB, [[wikipedia:High-Efficiency Advanced Audio Coding|MPEG-4 HE-AACv2]] for DAB+ or video in MPEG-4 H.264 for T-DMB.
 *The '''Multiplexer''' gathers different streams, produces necessary signalling and outputs a single 2048kbit/s stream in ETI format ([[Ensemble Transport Interface]]).
-*The '''Modulator''' takes the ETI stream and produce a complex I/Q [[wikipedia:baseband|baseband]] OFDM signal ready for upconversion to the desired radio frequency.
+*The '''Modulator''' takes the ETI stream and produces a complex I/Q [[wikipedia:baseband|baseband]] OFDM signal ready for up-conversion to the desired radio frequency.
-*The '''[[RF]] transmission''' is performed by the [[USRP]] or a similar device.
+*The '''[[RF]] transmission''' is performed by the [[USRP]], a [[HackRF One]] or a similar device.
-The mmbTools comprises two encoders: [[Toolame]] and [[fdk-aac-dabplus]]; it includes a multiplexer [[ODR-DabMux]] and a modulator [[ODR-DabMod]].
+The ODR-Tools comprises two encoders: [[Toolame]] and [[fdk-aac-dabplus]]; it includes a multiplexer [[ODR-DabMux]] and a modulator [[ODR-DabMod]].
 Thanks to the modular approach from these tools it is possible to interface them with other implementations and tools.
@@ Line 22: / Line 22: @@
 A will need:
-* Some linux system knowledge.
+* Some Linux system knowledge.
 * A recent PC running Debian stable: http://debian.org
 * A [[USRP]] (B200, B100, USRP2 and USRP1 are tested to work. The others should be fine too, no guarantees.)
@@ Line 31: / Line 31: @@
 ** Read the guide http://mpb.li/pub/mmbtools.pdf which is still a work in progress.
 ** Read the pages about the ODR-mmbTools listed below.
-* To install the required tools on the debian PC. The [[Installer scripts]] will simplify this a lot.
+* To install the required tools on the Debian Linux PC. The [[Installer scripts]] will simplify this a lot.
 * Have a look at the example mux and mod configurations in the respective doc/ folders and in mmbtools-aux.
 * And of course, a DAB receiver.
@@ Line 47: / Line 47: @@
 Once this works, try to get all tools running simultaneously, interconnected using ZeroMQ.
-Good luck, and '''don't transmit''' without a licence !
+Good luck, and '''don't transmit''' without a license !
 Other users and developers are reachable on the crc-mmbtools google group:
 https://groups.google.com/forum/#!forum/crc-mmbtools

@@ Line 42: / Line 42: @@
 # Create a configuration file for [[ODR-DabMux]], using [https://github.com/Opendigitalradio/ODR-DabMod/blob/master/doc/example.ini doc/example.mux] as a base. Use the .dabp files as input and limit the duration of the ETI file to a few thousand frames (a couple of minutes worth of data).
 # Using [[ODR-DabMux]] with this configuration, create a RAW ETI file containing your multiplex.
-# If you want, compile [[ETISnoop]] and analyse the ETI file.
+# If you want, compile [[etisnoop]] and analyse the ETI file.
 # Use [[ODR-DabMod]] to modulate this ETI file and create an I/Q file.

@@ Line 1: / Line 1: @@
 ==Introduction==
-DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It's based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in the VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programmes, called a multiplex. The system has been designed for mobile use and is robust up to 300km/h.
+DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It's based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in the VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programmes, called a multiplex or ensemble. The system has been designed for mobile use and is robust up to 300km/h.
 With the development of the '''mmbTools''' by [http://mmbtools.crc.ca CRC] and opendigitalradio, it is now possible to run a full transmission infrastructure on a laptop running linux and using a [http://en.wikipedia.org/wiki/USRP USRP] as [[RF]] hardware (with [[wikipedia:gnuradio|gnuradio]]) or any other similar device.
@@ Line 8: / Line 8: @@
 *The '''Multiplexer''' gathers different streams, produces necessary signalling and outputs a single 2048kbit/s stream in ETI format ([[Ensemble Transport Interface]]).
 *The '''Modulator''' takes the ETI stream and produce a complex I/Q [[wikipedia:baseband|baseband]] OFDM signal ready for upconversion to the desired radio frequency.
-*The '''[[RF]] transmission''' is performed by the [[USRP]].
+*The '''[[RF]] transmission''' is performed by the [[USRP]] or a similar device.
 The mmbTools comprises two encoders: [[Toolame]] and [[fdk-aac-dabplus]]; it includes a multiplexer [[ODR-DabMux]] and a modulator [[ODR-DabMod]].

@@ Line 29: / Line 29: @@
 ** Have a look at ETSI EN 300 401 to understand DAB better.
 ** Maybe also ETSI ETS 300 799 defines the [[ETI]] interface between multiplexer and modulator.
 ** Read the pages about the ODR-mmbTools listed below.
 * To install the required tools on the debian PC. The [[Installer scripts]] will simplify this a lot.

@@ Line 1: / Line 1: @@
 ==Introduction==
-DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programs, called a multiplex. The system has been designed for mobile use and is robust up to 300km/h.
+DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It's based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in the VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programmes, called a multiplex. The system has been designed for mobile use and is robust up to 300km/h.
 With the development of the '''mmbTools''' by [http://mmbtools.crc.ca CRC] and opendigitalradio, it is now possible to run a full transmission infrastructure on a laptop running linux and using a [http://en.wikipedia.org/wiki/USRP USRP] as [[RF]] hardware (with [[wikipedia:gnuradio|gnuradio]]) or any other similar device.
-The transmission chain can be divided in 4:
+The transmission chain can be divided in 4 parts:
-*The encoding: encoding the sound to [[wikipedia:MPEG-1 Audio Layer II|MPEG-2 Layer II]] for DAB, [[wikipedia:High-Efficiency Advanced Audio Coding|MPEG-4 HE-AACv2]] for DAB+ or video in MPEG-4 H.264 for T-DMB.
+*The '''Encoder''' encodes the audio source to [[wikipedia:MPEG-1 Audio Layer II|MPEG-2 Layer II]] for DAB, [[wikipedia:High-Efficiency Advanced Audio Coding|MPEG-4 HE-AACv2]] for DAB+ or video in MPEG-4 H.264 for T-DMB.
-*The Multiplexer: gather different streams, produce necessary signalling and output a single 2Mbit/s stream in ETI format ([[Ensemble Transport Interface]]).
+*The '''Multiplexer''' gathers different streams, produces necessary signalling and outputs a single 2048kbit/s stream in ETI format ([[Ensemble Transport Interface]]).
-*The Modulator: take the ETI stream and produce the complex [[wikipedia:baseband|baseband]] OFDM signal ready for upconvert at the desired radio frequency.
+*The '''Modulator''' takes the ETI stream and produce a complex I/Q [[wikipedia:baseband|baseband]] OFDM signal ready for upconversion to the desired radio frequency.
-*The [[RF]] transmission performed by the USRP using appropriate RF daughterboards (Basic TX or modified RFX400).
+*The '''[[RF]] transmission''' is performed by the [[USRP]].
-However thank to the modular approach from these tools it is possible to interface it with other implementations. If there's no other software OFDM DAB modulator implementation at the moment, for the encoding it is possible to re-use [[Toolame]] that is an implementation of MPEG-2 Layer II.
+The mmbTools comprises two encoders: [[Toolame]] and [[fdk-aac-dabplus]]; it includes a multiplexer [[ODR-DabMux]] and a modulator [[ODR-DabMod]].
 ==How to get started==
 Let's say you want to learn about DAB transmission and set up a laboratory transmitter that you can use to experiment, gain better understanding, test ideas, evaluate receivers or do measurements.
@@ Line 20: / Line 24: @@
 * Some linux system knowledge.
 * A recent PC running Debian stable: http://debian.org
-* A [[USRP]] (B200, USRP1, B100, USRP2, are tested to work. The others should be fine too, no guarantees.)
+* A [[USRP]] (B200, B100, USRP2 and USRP1 are tested to work. The others should be fine too, no guarantees.)
 * To read documentation:
 ** Read http://en.wikipedia.org/wiki/Digital_audio_broadcasting.
@@ Line 29: / Line 33: @@
 * Have a look at the example mux and mod configurations in the respective doc/ folders and in mmbtools-aux.
 * And of course, a DAB receiver.
 Good luck, and '''don't transmit''' without a licence !
@@ Line 34: / Line 50: @@
 Other users and developers are reachable on the crc-mmbtools google group:
 https://groups.google.com/forum/#!forum/crc-mmbtools

← Older revision		Revision as of 18:34, 9 July 2014
Line 44:		Line 44:
	* [[Fdk-aac-dabplus]] DAB+ encoder		* [[Fdk-aac-dabplus]] DAB+ encoder
	* [[CRC-dabplus]] DAB+ encoder (not open source)		* [[CRC-dabplus]] DAB+ encoder (not open source)
		+
		+	New ideas: [[Ideas_for_projects]]

← Older revision		Revision as of 10:08, 14 March 2014
Line 11:		Line 11:

	However thank to the modular approach from these tools it is possible to interface it with other implementations. If there's no other software OFDM DAB modulator implementation at the moment, for the encoding it is possible to re-use [[Toolame]] that is an implementation of MPEG-2 Layer II.		However thank to the modular approach from these tools it is possible to interface it with other implementations. If there's no other software OFDM DAB modulator implementation at the moment, for the encoding it is possible to re-use [[Toolame]] that is an implementation of MPEG-2 Layer II.
		+
		+	==How to get started==
		+
		+	Let's say you want to learn about DAB transmission and set up a laboratory transmitter that you can use to experiment, gain better understanding, test ideas, evaluate receivers or do measurements.
		+
		+	A will need:
		+
		+	* Some linux system knowledge.
		+	* A recent PC running Debian stable: http://debian.org
		+	* A [[USRP]] (USRP1, B100, USRP2, are tested to work. The others should be fine too, no guarantees.)
		+	* To read documentation:
		+	** Read http://en.wikipedia.org/wiki/Digital_audio_broadcasting.
		+	** Have a look at ETSI EN 300 401 to understand DAB better.
		+	** Maybe also ETSI ETS 300 799 defines the [[ETI]] interface between multiplexer and modulator.
		+	** Read the pages about the ODR-mmbTools listed below.
		+	* To install the required tools on the debian PC. The [[Installer scripts]] will simplify this a lot.
		+	* Have a look at the example mux and mod configurations in the respective doc/ folders and in mmbtools-aux.
		+	* And of course, a DAB receiver.
		+
		+	Good luck, and '''don't transmit''' without a licence !
		+
		+	Other users and developers are reachable on the crc-mmbtools google group:
		+	https://groups.google.com/forum/#!forum/crc-mmbtools

	==ODR-mmbTools==		==ODR-mmbTools==

@@ Line 20: / Line 20: @@
 * [[Toolame]] DAB encoder
 * [[Fdk-aac-dabplus]] DAB+ encoder
-* [[CRC-DabPlus]] DAB+ encoder (not open source)
+* [[CRC-dabplus]] DAB+ encoder (not open source)

← Older revision		Revision as of 14:26, 10 February 2014
Line 1:		Line 1:
		+	==Introduction==
	DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programs, called a multiplex. The system has been designed for mobile use and is robust up to 300km/h.		DAB, DAB+ and T-DMB European digital radio and mobile television standards share the same transmission system. It based on [http://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiplexing OFDM] modulation and uses 1.5MHz of spectrum in VHF television band 3 (or L-band in SHF). A transmitter is broadcasting a set of programs, called a multiplex. The system has been designed for mobile use and is robust up to 300km/h.

Line 10:		Line 11:

	However thank to the modular approach from these tools it is possible to interface it with other implementations. If there's no other software OFDM DAB modulator implementation at the moment, for the encoding it is possible to re-use [[Toolame]] that is an implementation of MPEG-2 Layer II.		However thank to the modular approach from these tools it is possible to interface it with other implementations. If there's no other software OFDM DAB modulator implementation at the moment, for the encoding it is possible to re-use [[Toolame]] that is an implementation of MPEG-2 Layer II.
		+
		+	==ODR-mmbTools==
		+	The ODR-mmbTools comprise the following tools:
		+	* [[ODR-DabMux]] Ensemble Multiplexer
		+	* [[ODR-DabMod]] COFDM Modulator
		+
		+	They work with
		+	* [[Toolame]] DAB encoder
		+	* [[Fdk-aac-dabplus]] DAB+ encoder
		+	* [[CRC-DabPlus]] DAB+ encoder (not open source)