Multiple issues expert subject September 2011 refimprove September 2011 context May 2009 An endec is a device which acts as both an encoding encoder and a encoding decoder on a Signal computing signal or data stream , either with the same or separate circuitry or algorithm. The combining of these names is a portmanteau . TOC Definition The general difference between an endec and a codec compressor decompressor is that hardware is usually considered to be an endec, while software is considered to be the codec. Dubious date May 2009 Similarly, the word encoding is usually used for hardware, while Code coding is usually used in regard to software. A device or program which uses a data compression compression algorithm to create MPEG sound audio and or video is often called an encoder, and one which plays back such files is a decoder. However, this is technically a codec, especially if performed in software . cn date September 2011 Examples Examples of encoders, decoders, and endecs include A modem is an endec, likewise a modulator is an encoder and a demodulator is a decoder An Emergency Alert System unit is usually an endec, but sometimes just a decoder A stereo generator used in broadcasting is an encoder A combination analog to digital converter ADC and digital to analog converter DAC would technically be an endec, though they are usually called CODECs Hardware that encodes data bits to a run length limited line code , and decodes the line code back to data bits, is an endec. ref United States Patent 5844507 ref When implementing the Infrared Data Association IrDA protocol, often an endec is used between the UART and the optoelectronics. ref http search.maxim ic.com search?q 22ENDEC 22&restrict english appnotes&site Maxim&output xml no dtd&client Maxim&num 20&proxystylesheet http 3A 2F 2Fwww.maxim ic.com 2Fsearch 2Fsearch3.xcgi&go Maxim IC search for endec app notes ref ref http infocenter.arm.com help index.jsp?topic com.arm.doc.ddi0183g I31065.html IrDA SIR ENDEC functional ... more details
other uses G code disambiguation Image showview.jpg 200px right Image videoplus.jpg 200px right Image with unknown copyright status removed Image gcode.jpg 200px right VCR Plus , G Code , VideoPlus and ShowView are different names for essentially the same system for programming video recorder s. These names are all registered trademarks of Macrovision , whose corporate predecessor, Gemstar , developed these algorithms for use in integrated endec s. History Before the advent of on screen displays, the only interface available for programming a home video recorder was a small LED or LCD panel and a small number of buttons. Correctly recording a specific program was therefore a somewhat complex operation for many people scores of jokes have referred over the years to the need to have a 12 year old or someone technically adept to successfully program a home video recorder or to avoid having a perpetual blinking 12 00 on the recorder s display. G Code, VideoPlus and ShowView were introduced to remove this difficulty. Concept The central concept of the system is a unique number, a PlusCode, assigned to each program, and published in TV listings in newspapers and magazines. To record a program, the number is taken from the newspaper and typed into the video recorder, which will then record on the correct channel at the correct time. The number is generated by an algorithm from the date, time and channel of the programme, and so does not rely on anything being broadcast over the air. This means it will not compensate for a disrupted schedule due to live sporting events or news bulletins, but many video recorders with these systems also incorporate Programme Delivery Control PDC and will use that to alter times if possible. Branding This system has been licensed to TV and VCR manufacturers in about 40 countries, but is known under different names. It is known as VCR Plus in the USA and Canada , G Code in Japan , China , New Zealand and Australia , VideoPlus in Ireland and th ... more details
end of message marker. Image Sage EAS Endec.jpg right thumb A Sage EAS ENDEC unit. The Audio Same.ogg ... servicesandsupport sage Default.asp SAGE Digital ENDEC Information http www.gorman redlich.com downloads.html ... SAGE ENDEC MANUAL ENDEC Manual http www.broadcast.harris.com servicesandsupport sage sage.pdf Sage ENDEC Alerting Systems Product Datasheet Telecommunications Category Civil defense Category ... more details
About encoding and decoding a digital data stream further List of codecs A codec is a device or computer program capable of encoder encoding or Decoding methods decoding a digital data stream or signal information theory signal . ref cite web url https www.microsoft.com windows windowsmedia player faq codec.mspx title Using codecs publisher Microsoft accessdate 2009 12 21 ref ref cite web url http desktopvideo.about.com od glossary g codec.htm title About.com Codec publisher About.com accessdate 2009 12 21 ref ref cite web url http www.afterdawn.com glossary terms codec.cfm title Glossary Codec publisher Afterdawn.com accessdate 2009 12 21 ref ref cite web url https help.ubuntu.com 8.04 musicvideophotos C codecs.html title Ubuntu Documentation What is a codec? publisher Ubuntu Documentation Team accessdate 2009 12 21 ref The word codec is a portmanteau of co mpressor dec ompressor or, more commonly, co der dec oder . A codec the program should not be confused with a coding or compression format or standard a format is a document the standard , a way of storing data, while a codec is a program an implementation which can read or write such files. In practice, however, codec is sometimes used loosely to refer to formats. A codec encodes a data stream or signal for transmission, storage or encryption , or decodes it for playback or editing. Codecs are used in Video teleconference videoconferencing , streaming media and video editing applications. A video camera s analog to digital converter ADC converts its analog signals into digital signals, which are then passed through a video codec video compressor for digital transmission or storage. A receiving device then runs the signal through a video decompressor, then a digital to analog converter DAC for analog display. The term codec is also used as a generic name for a video conferencing unit. Related concepts An endec encoder decoder is a similar yet different concept mainly used for hardware. In the mid 20th century, a ... more details
AMD Lance Am7990 IEEE 802.3 ref name amd 17881 Am7990 cite web title AMD Am79C90 CMOS Local Area Network Controller for Ethernet C LANCE url http www.amd.com files connectivitysolutions networking archivednetworking 17881.pdf 090427 amd.com ref Ethernet Media Access Control ler MAC controller were introduced in 1985 . ref name amd com net186bd cite web title Net186 tm Demonstration Board User s Manual url http support.amd.com it Embedded TechDocs net186bd.pdf 090426 amd.com ref Its architecture is the basis for Advanced Micro Devices AMD s PCnet Family of highly integrated single chip Ethernet controllers. The one exception is the Am79C940 MAC. The Am7990 chip was fabricated in nMOS logic NMOS technology and has no integrated Manchester code Manchester encoder decoder ENDEC nor does it have an integrated 10BASE T transceiver. Compatibility original research section date November 2010 A later refabricated chip called the C LANCE Am79C90 is made with 0.8 micrometre CMOS technology. The original NMOS version Am7990 and the CMOS Am79C90 version are differ in some details which may have an impact on device driver compatibility. Citation needed date July 2011 The datasheet for the CMOS version writes that the CMOS and NMOS versions are the same. But the Table B 1. Comparison Summary of the C LANCE and LANCE Devices in the datasheet shows they differ. These differences are not likely to require modifications of any device driver. dault?, check datasheet The PCnet family of Ethernet controllers PCnet Industry Standard Architecture ISA II, PCnet 32, PCnet Conventional PCI PCI II and PCnet FAST is LANCE software compatible. This means you should be able use the original 16 bit software on these members of the PCnet family of single chip Ethernet controllers. Features The Am7990 can handle 10BASE 5 Type A, 10BASE 2 Type B, and 10BASE T. Back to back packet reception with as little as 0,5 s interframe spacing. Direct memory access DMA Bus mastering 24 bit 16M address capable. ... more details
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