Encoders
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The document discusses different types of encoders. It defines an encoder as a device, circuit, transducer, software, algorithm, or person that converts information from one format to another. It provides examples of linear encoders that encode position and digital encoders that convert multiple inputs into a binary coded output. Specifically, it describes an n-bit binary encoder that has 2n inputs and n outputs, and provides truth tables for 8-to-3 and 4-to-2 bit encoders. It also discusses priority encoders that prioritize inputs and output the code of the highest priority active input.
Encoders
- 4. Defination of Encoder The encoder is a combinational circuit that performs the reverse operation of the decoder. The encoder has a maximum of 2n inputs and n outputs. The simplest encoder is a 2n-to-n binary encoder One of 2n inputs = 1 Output is an n-bit binary number . . . . . . 2n inputs n outputs Binary encoder
- 5. Encoder – What is it? An encoder is a: Device Circuit Transducer Software Program Algorithm Person that converts information from one format to another
- 7. LINEAR ENCODER A linear encoder is a sensor, transducer or readhead paired with a scale that encodes position. The sensor reads the scale in order to convert the encoded position into an Analog signal analog or digital signa
- 19. The Digital Encoder Digital Encoder more commonly called a Binary Encoder takes ALL its data inputs one at a time and then converts them into a single encoded output. So we can say that a binary encoder, is a multi- input combinational logic circuit that converts the logic level "1" data at its inputs into an equivalent binary code at its output.
- 20. 4-to-2 Bit Binary Encoder
- 21. The Digital Encoder Generally, digital encoders produce outputs of 2-bit, 3-bit or 4-bit codes depending upon the number of data input lines. An "n-bit" binary encoder has 2n input lines and n-bit output lines with common types that include 4-to-2, 8-to-3 and 16-to-4 line configurations.
- 22. • 2n -to-n encoder : 2n inputs and n outputs. • Input code : 1-out-of-2n. • Output code : Binary Code • Example : n=3, 8-to-3 encoder • Inputs Outputs • I0 I1 I2 I3 I4 I5 I6 I7 Y2 Y1 Y0 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 1 1 1 I1 I2 I3 Y1 Y2I4 I5 I6 I0 Y0 I7 Binary encoder 8-to-3 encoder Implementation
- 23. 8-to-3 Bit Priority Encoder
- 24. Digital Encoder using Logic Gates
- 25. The Priority Encoder solves the problems mentioned above by allocating a priority level to each input. The priority encoders output corresponds to the currently active input which has the highest priority. So when an input with a higher priority is present, all other inputs with a lower priority will be ignored. The priority encoder comes in many different forms with an example of an 8-input priority encoder along with its truth table shown below. Priority Encoder