CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)

Description

H03M covers the design and implementation of electronic circuits and devices for encoding, decoding, and converting information between different coding schemes and signal formats. This includes analog-to-digital converters (ADCs), digital-to-analog converters (DACs), error-correcting code circuits, modulation and demodulation circuits, and general data conversion systems. The subclass addresses the physical circuitry and hardware implementations rather than the mathematical algorithms or software aspects of coding theory. Related signal processing and transmission topics are handled in adjacent classes such as H04L (digital information transmission) and G06F (digital computing).

8 direct subcodes

Child Classifications

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H03M 1/00 Analogue/digital conversion; Digital/analogue conversion (conversion of analogue values to or from differential modulation H03M3/00)
H03M 11/00 Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys (keyboard switch arrangements, structural association of coders and keyboards H01H13/70, H03K17/94)
H03M 13/00 Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes (error detection or error correction for analogue/digital, digital/analogue or code conversion H03M1/00 – H03M11/00; specially adapted for digital computers G06F11/08; for information storage based on relative movement between record carrier and transducer G11B, e.g. G11B20/18; for static stores G11C)
H03M 3/00 Conversion of analogue values to or from differential modulation
H03M 5/00 Conversion of the form of the representation of individual digits
H03M 7/00 Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits
H03M 9/00 Parallel/series conversion or vice versa (digital stores in which the information is moved stepwise per se G11C19/00)
H03M 99/00 Subject matter not provided for in other groups of this subclass