Encoders and decoders are two important components in digital circuits.

　　Encoders and decoders are two important components in digital circuits, playing crucial roles in data processing and communication systems. The following provides a detailed overview of encoders and decoders:

　　Encoder

　　An encoder is a device that converts input signals or data into a specific coded format. It can transform analog signals—such as angular displacement or linear displacement—into digital signals, or convert one digital format into another. Encoders come in various types and can be classified into the following categories based on different criteria:

　　No translatable content (original contained only an invisible character U+200C). Classification by operating principle :

　　No translatable content (original contained only an invisible character U+200C). Incremental encoder : Convert displacement into periodic electrical signals, then transform these signals into counting pulses, with the number of pulses representing the magnitude of the displacement.

　　No translatable content (original contained only an invisible character U+200C). Absolute encoder Each position corresponds to a specific numerical code, and its indicated value depends solely on the measurement’s start and end positions, being independent of the intermediate stages of the measurement.

　　No translatable content (original contained only an invisible character U+200C). Classification by Readout Method :

　　No translatable content (original contained only an invisible character U+200C). Contact encoder : It reads position information through mechanical contact and features a simple structure and low cost.

　　No translatable content (original contained only an invisible character U+200C). Non-contact encoder (Such as optical encoders and magnetic encoders): These devices employ a non-contact measurement principle, offering high precision, high speed, and long service life, and are widely used in industrial automation, machine tools, robotics, and other fields.

　　No translatable content (original contained only an invisible character U+200C). Classification by Signal Output Type :

　　Voltage output, open-collector output, push-pull complementary output, long-line drive output, and others.

　　Decoder

　　A decoder is a device that converts an input encoded signal or data into an output signal or data. It performs the inverse operation of encoding, effectively “translating” the specific meaning represented by the code. Decoders can be classified into various types, including:

　　No translatable content (original contained only an invisible character U+200C). Variable Decoder : Converts a smaller number of input signals into a larger number of output signals; common examples include n-to-2^n decoders and 8421 BCD decoders.

　　No translatable content (original contained only an invisible character U+200C). Display decoder : Used to convert binary numbers into their corresponding seven-segment codes, enabling LED or LCD display devices to show digits or characters.

　　The operation of a decoder is based on combinational logic circuits, which implement the transformation from inputs to outputs using logic gates. In digital systems, decoders are widely used in applications such as data distribution, address decoding, and display driving.

　　In summary, encoders and decoders are fundamental components in digital circuits. By employing distinct operating principles and classification schemes, they perform the encoding and decoding of signals and data, thereby providing crucial support for the proper functioning of digital systems.