A decoder is a circuit that changes a code into a set of signals. It is called a decoder because it does the reverse of encoding, but we will begin our study of encoders and decoders with decoders because they are simpler to design.
Generally a decoders output code normally has more bits than its input code and practical “binary decoder” circuits include, 2-to-4, 3-to-8 and 4-to-16 line configurations. An example of a 2-to-4 line decoder along with its truth table is given below. We can say that a binary decoder is a demultiplexer with an additional data line that is used to enable the decoder. An alternative way of looking at the decoder circuit is to regard inputs A, B and C as address signals. LF101XF function decoder 1 The DIGITAL plus by Lenz LF101XF function decoder is suitable for use in all scales. Features include: ∗ Six function outputs rated at 200mA each with advanced function mapping. (In analogue mode, the decoder functions are inactive). A total of six outputs are available. A typical application is the switching of coach lights or the direction-dependent front light of control cars. The LF101XF has a special drive for diode-equipped LF101XF function decoder 3 Features of the function decoder LF101XF The LF101XF is a DCC function decoder used to control functions in locomotives or coaches. (In analogue mode, the decoder functions are inactive). A total of six outputs are available. A typical application is the switching of coach lights or the direction-dependent front light of control cars. The LF101XF has a special drive for diode-equipped control cars. 1 Binary decoder, digital circuits such as 1-of-N and seven-segment decoders. 2  Decompressor (compression decoder), converts compressed data (e.g., audio/video/images) to an uncompressed form. 3  Instruction decoder, an electronic circuit that converts computer instructions into CPU control signals. 1 Decompressor (compression decoder), converts compressed data (e.g., audio/video/images) to an uncompressed form. 2  Instruction decoder, an electronic circuit that converts computer instructions into CPU control signals. 3  Video decoder, converts base-band analog video to digital form. An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another, for the purposes of standardization, speed, secrecy, security or compressions.  Chapter 9 - Combinational Logic Functions. A decoder is a circuit that changes a code into a set of signals. It is called a decoder because it does the reverse of encoding, but we will begin our study of encoders and decoders with decoders because they are simpler to design. A common type of decoder is the line decoder which takes an n-digit binary number and decodes it into 2 n data lines. The simplest is the 1-to-2 line decoder. The truth table is. A is the address and D is the dataline In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null. The maximum number of components in the DECODE function, including expr, searches, results, and default, is 255. DECODE compares expr to each search value one by one. If expr is equal to a search, then Oracle Database returns the corresponding result. If no match is found, then Oracle returns default. If default is omitted, then Oracle returns null. 1 FX3 decoders offer qualifiers for FX function operation qualified by one of the following: the loco's direction of travel, whether F0 is on or off, loco direction and F0, or whether the loco is moving or not. 2  These qualifiers are also available on function outputs that are used as standard on/off functions. When an FX 3 decoder output is set up for static on/off operation (no FX 3 effect), you can use static qualifiers to customize the operation of the on/off function of that output. In this case, the second digit of the FX 3 control CV will always be 0 to set the decoder for static (no FX 3)function operation. Function decoders are for vehicles without a motor and have therefore no motor end stage. However, they do have some special features for applications in coaches that are part of a train. The function decoder MX685 is based on the loco decoder MX630 (almost identical board and hardware). The dimensions are the same and is therefore suitable for HO (or larger gauges). The MX681 on the other hand is based on the miniature decoder MX621.  There are lots of encoders/decoders. A typical encoder takes a signal that is 1 out of N, encodes and it into a smaller number of lines. A corresponding decoder takes those encoded value, and restores the 1 of N value. For example, here is a 1 of 9 decoder, which encodes the input into a 4-bit BCD value. The corresponding decoder takes that BCD value, and restores the 1 of N output: Note that there is one more output than input; there is no need for a I0 input since it would decode to a BCD value of 0 0 0 0 anyway
http://www.electronics-tutorials.ws/combination/comb_5.html http://www.lenzusa.com/1newsite1/Manuals/lf101.pdf http://www.lenzusa.com/1newsite1/Manuals/lf101.pdf https://en.wikipedia.org/wiki/Decoder https://en.wikipedia.org/wiki/Encoder http://www.allaboutcircuits.com/textbook/digital/chpt-9/decoder/ http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions040.htm http://www.digitrax.com/products/retired/function-decoders/fn04/ http://www.mrsonline.net/html/function_decoders.html http://electronics.stackexchange.com/questions/162062/encoder-and-decoder-function
what is the function of decoder