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17 items tagged "transmission"
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directory traversal vulnerability [+],
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transportation [+],
transmission fluid [+],
sniffjoke [+],
sensor [+],
rf transmission [+],
remote starter [+],
released [+],
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neutral position [+],
multiple [+],
manchester encoding [+],
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magnet wire [+],
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brian j hoskins [+],
ben [+],
band [+],
alright [+],
Wireless [+]
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14:30
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Hack a Day
We realize the transmission fluid of an automobile’s automatic transmission is used to transfer the power from the engine to the drive shaft. But after watching this Department of Defense video from 1954 we now have a full understanding of the principles involved in fluid coupling. Like us, you probably have seen a diagram of a transmission [...]
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21:31
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SecDocs
Authors:
Christian Daniel Thomas Kleffel Tags:
TV Event:
Chaos Communication Congress 23th (23C3) 2006 Abstract: As DVB-T is the key technology for terrestrial broadcasting for the next decades, this lecture tries to explain how it works: It covers the way of raw pixel data over MPEG2 video and audio encoding and via multiplexing of several streams and programs to the actual generation of the COFDM signal used for transmission. As the team has built a DVB-T transmitter, we will give a in-depth insight in how things are really done - including a demonstration of the transmitter. Analog PAL based TV transmission is no more - DVB has taken over in Germany. This should be legitimate reason to take a really deep look into how the new technology works and what needs to be done to get your own transmission into the air. The base for our lecture is a standard FBAS signal coming from a video camera. From there we will go with it through all the necessary stages of encoding, framing, multiplexing and modulating. First step is the A/D conversion of the picture and the sound. The resulting 240MBit/s stream is fed into the MPEG2 encoder where video and audio is encoded using the given parameters resulting in a bitstream of defined datarate. To achieve that, the video is divided into single blocks, movement relative to earlier and later frames is detected, and then the data is transferred into the frequency domain and then encoded. A relatively similar thing is done to audio: It is split into several frequency bands and for every band it is decided if the listener will hear this band or not using a psycho accoustical model. Then the remaining data is encoded into a bitstream as well. After that a program clock reference is generated to enable the receiver to keep video and audio in sync while playing back the stream. During the next stage, all video- and audio-streams are multiplexed into one big transport stream and several data tables are added. These tables define, which programs belong to this transport stream and assign video and audio streams to these programs. Electronic program guide and teletext are added and finally the COFDM modulator has the job to generate a base band signal for transmission. Here data is scrambled and interleaved several times, two types of forward error correction are added and then the bits are distributed to the up to 8000 distinct carriers which compose the final signal. As we have built a complete OFDM modulator we will then demonstrate how all these things work together and finally you will be able to watch our transmission using your own DVB-T stick.
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21:31
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SecDocs
Authors:
Christian Daniel Thomas Kleffel Tags:
TV Event:
Chaos Communication Congress 23th (23C3) 2006 Abstract: As DVB-T is the key technology for terrestrial broadcasting for the next decades, this lecture tries to explain how it works: It covers the way of raw pixel data over MPEG2 video and audio encoding and via multiplexing of several streams and programs to the actual generation of the COFDM signal used for transmission. As the team has built a DVB-T transmitter, we will give a in-depth insight in how things are really done - including a demonstration of the transmitter. Analog PAL based TV transmission is no more - DVB has taken over in Germany. This should be legitimate reason to take a really deep look into how the new technology works and what needs to be done to get your own transmission into the air. The base for our lecture is a standard FBAS signal coming from a video camera. From there we will go with it through all the necessary stages of encoding, framing, multiplexing and modulating. First step is the A/D conversion of the picture and the sound. The resulting 240MBit/s stream is fed into the MPEG2 encoder where video and audio is encoded using the given parameters resulting in a bitstream of defined datarate. To achieve that, the video is divided into single blocks, movement relative to earlier and later frames is detected, and then the data is transferred into the frequency domain and then encoded. A relatively similar thing is done to audio: It is split into several frequency bands and for every band it is decided if the listener will hear this band or not using a psycho accoustical model. Then the remaining data is encoded into a bitstream as well. After that a program clock reference is generated to enable the receiver to keep video and audio in sync while playing back the stream. During the next stage, all video- and audio-streams are multiplexed into one big transport stream and several data tables are added. These tables define, which programs belong to this transport stream and assign video and audio streams to these programs. Electronic program guide and teletext are added and finally the COFDM modulator has the job to generate a base band signal for transmission. Here data is scrambled and interleaved several times, two types of forward error correction are added and then the bits are distributed to the up to 8000 distinct carriers which compose the final signal. As we have built a complete OFDM modulator we will then demonstrate how all these things work together and finally you will be able to watch our transmission using your own DVB-T stick.
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21:31
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SecDocs
Authors:
Christian Daniel Thomas Kleffel Tags:
TV Event:
Chaos Communication Congress 23th (23C3) 2006 Abstract: As DVB-T is the key technology for terrestrial broadcasting for the next decades, this lecture tries to explain how it works: It covers the way of raw pixel data over MPEG2 video and audio encoding and via multiplexing of several streams and programs to the actual generation of the COFDM signal used for transmission. As the team has built a DVB-T transmitter, we will give a in-depth insight in how things are really done - including a demonstration of the transmitter. Analog PAL based TV transmission is no more - DVB has taken over in Germany. This should be legitimate reason to take a really deep look into how the new technology works and what needs to be done to get your own transmission into the air. The base for our lecture is a standard FBAS signal coming from a video camera. From there we will go with it through all the necessary stages of encoding, framing, multiplexing and modulating. First step is the A/D conversion of the picture and the sound. The resulting 240MBit/s stream is fed into the MPEG2 encoder where video and audio is encoded using the given parameters resulting in a bitstream of defined datarate. To achieve that, the video is divided into single blocks, movement relative to earlier and later frames is detected, and then the data is transferred into the frequency domain and then encoded. A relatively similar thing is done to audio: It is split into several frequency bands and for every band it is decided if the listener will hear this band or not using a psycho accoustical model. Then the remaining data is encoded into a bitstream as well. After that a program clock reference is generated to enable the receiver to keep video and audio in sync while playing back the stream. During the next stage, all video- and audio-streams are multiplexed into one big transport stream and several data tables are added. These tables define, which programs belong to this transport stream and assign video and audio streams to these programs. Electronic program guide and teletext are added and finally the COFDM modulator has the job to generate a base band signal for transmission. Here data is scrambled and interleaved several times, two types of forward error correction are added and then the bits are distributed to the up to 8000 distinct carriers which compose the final signal. As we have built a complete OFDM modulator we will then demonstrate how all these things work together and finally you will be able to watch our transmission using your own DVB-T stick.
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8:50
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Hack a Day
[Ben] bought a remote starter for his car but needed a way to make sure the manual transmission was in neutral when starting. He built this infrared sensor frame to detect the position of the stick. It uses four beam paths which will tell him the exact gear or neutral position of the shifter. For [...]
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9:01
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Hack a Day
[W1VLF] is on a quest to communicate over long distances with a 9 kilohertz transmitter. He built this giant coil with that in mind. A round concrete form was used as a base and wound with magnet wire by hand. We’d recommend building an automated winding device, but this method seems to have worked. Operating [...]
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7:01
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Hack a Day
Alright class, quiet down and open your books to the chapter on Manchester Encoding. [Brian J Hoskins] did just that when building this RC5 decoder. This protocol is commonly used in television remote controls. You use them on a daily basis, don’t you think it’s time you understood what’s going on? Check out his writeup [...]
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18:36
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Packet Storm Security Recent Files
Mandriva Linux Security Advisory 2010-013 - Cross-site request forgery (CSRF) vulnerability in Transmission 1.5 before 1.53 and 1.6 before 1.61 allows remote attackers to hijack the authentication of unspecified victims via unknown vectors. Directory traversal vulnerability in libtransmission/metainfo.c in Transmission 1.22, 1.34, 1.75, and 1.76 allows remote attackers to overwrite arbitrary files via a. (dot dot) in a pathname within a.torrent file. The updated packages have been patched to correct these issues.
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18:35
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Packet Storm Security Advisories
Mandriva Linux Security Advisory 2010-013 - Cross-site request forgery (CSRF) vulnerability in Transmission 1.5 before 1.53 and 1.6 before 1.61 allows remote attackers to hijack the authentication of unspecified victims via unknown vectors. Directory traversal vulnerability in libtransmission/metainfo.c in Transmission 1.22, 1.34, 1.75, and 1.76 allows remote attackers to overwrite arbitrary files via a. (dot dot) in a pathname within a.torrent file. The updated packages have been patched to correct these issues.
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