In digital video broadcast (DVB), SDI is Serial Digital Interface an uncompressed form of A/V signal and ASI is Asynchronous Serial Interface an compressed form of A/V signal. The SDI signal hold the pids(audio, video, subtitle ...) of one channel, ASI can hold pids from multiple channels and in some cases (satelite uplink) some pids who describe the transponder(NIT, TID...)
DVB-ASI - Digital Video Broadcast- Asynchronous Serial InterfaceDVB-ASI is a serial video communications standard defined by the DVB consortium for use in transporting MPEG-2 encoded video streams. The standard is most commonly used to connect cable head-end equipment that transports MPEG-2 streams. Data is transported at a rate of 270 Mb/s. A complete discussion of DVB-ASI specifications is provided in EN 50083-9: Cabled Distribution Systems for Television, Sound and Interactive Multimedia Signals, available from ETSI. Implementation of multiple channels of DVB-ASI are possible in Xilinx FPGAs and typically result in substantial cost savings versus ASSP-based solutions. When integrated with SDI and HD-SDI, the FPGA becomes a true connectivy platform for all kinds of applications handling compressed and uncompressed video.Source: http://www.xilinx.com/esp/broadcast/interface.htm#ASI
SDI consists of only one form whereas MDI can ontain more than one form
TDI is a Turbocharged Direct Injection (ie. with a turbo) AND SDI is Suction Diesel Injection (ie. No Turbo) Daithi
SDI stands for Serial Digital Interface. It is a *format* for transmitting video over cable. The cable can be a coax, ethernet, whatever - SDI simply dictates how the video is coded over those wires. Consequently SDI must be encoded and decoded on either end of the cable. A common use would be to feed video to a HD-SDI switching unit for use in a live broadcast situation. If you plan on switching HD video it's basically the only way to go under $10K
SDI is an abbrevation of Standard Digital Interface. It's most known use is as interface for digital video. It's currently used a lot for the high definition video.
Asynchronous Serial Interface, or ASI, is streaming data format which often carries an MPEG Transport Stream .An ASI signal can carry one or multiple SD, HD or audio programs that are already compressed, not like an uncompressed SD-SDI (270Mbs) or HD-SDI (1.45Gbs. An ASI signal can be at varying transmission speeds and is completely dependent on the users setup requirements. For example, an ATSC (US Digital Standard for Broadcasting) has a maximum bandwidth of 19.392658 Mbps. Generally, the ASI signal is the final product of video compression, either MPEG2 or MPEG4, ready for transmission to a transmitter or microwave system or other device. Sometimes it is also converted to fiber, RF or SMPTE310 for other types of transmission. There are two transmission formats commonly used by the ASI interface, the 188 byte format and the 204 byte format. The 188 byte format is the more common ASI transport stream. When optional Reed-Solomon error correction data is included the packet can stretch an extra 16 bytes to 204 bytes total.
SDI stands for serial digital interface. It is a broadcast standard for digital video using a single co-ax cable and BNC connectors with a 75Ohm impedance. The signal carries digital component video, audio and other control data. SDI can also be carried over optical fiber although this is generally only used for long distances in the order of hundreds of metres or yards. Although the connection is the same as that used for composite or analog component signals, the two are not compatible and cannot be interchanged without conversion between analog and digital. SD-SDI runs at 270Mbit or 360Mbit and supports standard definition video signals without compression. It is used as the standard link between equipment in studios and edit suites. HD-SDI uses the same physical interface but runs at 1.48Gbit, five times the data rate of standard definition. It is a component format like the SD equivalent and supports 720p, 1080i at 50Hz and 59.94Hz. Like the SD version, it carries full bandwidth video without compression. The longest physical link for HD-SDI is typically in the order of 125 metres or 400 feet. Longer cables cause signal losses that will cause unreliable data transfer although the precise length is dependent of the type of cable used. Vision mixers or switchers often use inputs that can run as SD or HD. Some have dedicated inputs. Likewise, outputs can be switched between SD and HD in some units while others may have separate outputs offering and HD and SD version of the same content. The exact configuration depends on the manufacturer and the model. SDI is not found outside professional broadcast environments.
SDI is a Single Document Interface. As opposed to MDI which is a Multiple Document Interface. the difference is solely in the number of documents that can be opened at one time in each instance of the application. With SDI only one document can be open whereas with MDI many documents can be open.
SDI stands for serial digital interference. It is a video interface used within broadcast environments and supports both SD and HD signals. It runs on a single co-ax cable with BNC terminations. As well as video, the signal carries audio and other ancillary data such as closed captions, content identification and test signals. SDI is not found outside broadcast facilities so it will not be seen on domestic televisions or players.
SDI Technologies was created in 1956.
Surveillance Data Inc
SDI:S= SamsungD= Display and DigitalI = Interface and Internet componentSource: I SEE SDI (www.aeca.es/comisiones/.../samsung.pdf)