H
SECTION H — ELECTRICITY
 H03
BASIC ELECTRONIC CIRCUITRY
 H03M
CODING; DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F15C 4/00; optical analogue/digital converters G02F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G09G, G10L, G11B, G11C, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
 H03M 1/00
Analogue/digital conversion; Digital/analogue conversion (conversion of analogue values to or from differential modulation H03M 3/00)  [4]
 H03M 1/02
·  Reversible analogue/digital converters  [4]
 H03M 1/04
·  using stochastic techniques  [4]
 H03M 1/06
·  Continuously compensating for, or preventing, undesired influence of physical parameters (periodically H03M 1/10)  [4]
 H03M 1/08
·  ·  of noise  [4]
 H03M 1/10
·  Calibration or testing  [4]
 H03M 1/12
·  Analogue/digital converters (H03M 1/02-H03M 1/10 take precedence)  [4]
 H03M 1/14
·  ·  Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit  [4]
 H03M 1/16
·  ·  ·  with scale factor modification, i.e. by changing the amplification between the steps  [4]
 H03M 1/18
·  ·  Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging  [4]
 H03M 1/20
·  ·  Increasing resolution using an n bit system to obtain n + m bits, e.g. by dithering  [4]
 H03M 1/22
·  ·  pattern-reading type  [4]
 H03M 1/24
·  ·  ·  using movable discs  [4]
 H03M 1/26
·  ·  ·  ·  with weighted coding, i.e. the weight given to a digit depends on the position of the digit within the block or code word, e.g. there is a given radix and the weights are powers of this radix  [4]
 H03M 1/28
·  ·  ·  ·  with non-weighted coding  [4]
 H03M 1/30
·  ·  ·  ·  ·  incremental  [4]
 H03M 1/32
·  ·  ·  using cathode-ray tubes  [4]
 H03M 1/34
·  ·  Analogue value compared with reference values (H03M 1/48 takes precedence)  [4]
 H03M 1/36
·  ·  ·  simultaneously only, i.e. parallel type  [4]
 H03M 1/38
·  ·  ·  sequentially only, e.g. successive approximation type (converting more than one bit per step H03M 1/14)  [4]
 H03M 1/40
·  ·  ·  ·  recirculation type  [4]
 H03M 1/42
·  ·  ·  ·  Sequential comparisons in series-connected stages with no change in value of analogue signal  [4]
 H03M 1/44
·  ·  ·  ·  Sequential comparisons in series-connected stages with change in value of analogue signal  [4]
 H03M 1/46
·  ·  ·  ·  with digital/analogue converter for supplying reference values to converter  [4]
 H03M 1/48
·  ·  Servo-type converters  [4]
 H03M 1/50
·  ·  with intermediate conversion to time interval (H03M 1/64 takes precedence)  [4]
 H03M 1/52
·  ·  ·  Input signal integrated with linear return to datum  [4]
 H03M 1/54
·  ·  ·  Input signal sampled and held with linear return to datum  [4]
 H03M 1/56
·  ·  ·  Input signal compared with linear ramp  [4]
 H03M 1/58
·  ·  ·  Non-linear conversion  [4]
 H03M 1/60
·  ·  with intermediate conversion to frequency of pulses  [4]
 H03M 1/62
·  ·  ·  Non-linear conversion  [4]
 H03M 1/64
·  ·  with intermediate conversion to phase of sinusoidal signals  [4]
 H03M 1/66
·  Digital/analogue converters (H03M 1/02-H03M 1/10 take precedence)  [4]
 H03M 1/68
·  ·  with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits  [4]
 H03M 1/70
·  ·  Automatic control for modifying converter range  [4]
 H03M 1/72
·  ·  Sequential conversion in series-connected stages (H03M 1/68 takes precedence)  [4]
 H03M 1/74
·  ·  Simultaneous conversion  [4]
 H03M 1/76
·  ·  ·  using switching tree  [4]
 H03M 1/78
·  ·  ·  using ladder network  [4]
 H03M 1/80
·  ·  ·  using weighted impedances (H03M 1/76 takes precedence)  [4]
 H03M 1/82
·  ·  with intermediate conversion to time interval  [4]
 H03M 1/84
·  ·  ·  Non-linear conversion  [4]
 H03M 1/86
·  ·  with intermediate conversion to frequency of pulses  [4]
 H03M 1/88
·  ·  ·  Non-linear conversion  [4]
 H03M 3/00
Conversion of analogue values to or from differential modulation  [4]
 H03M 3/02
·  Delta modulation, i.e. one-bit differential modulation  [4]
 H03M 3/04
·  Differential modulation with several bits  [4]
 H03M 5/00
Conversion of the form of the representation of individual digits  [4]
 H03M 5/02 - 
H03M 5/22

Note(s)

In groups H03M 5/02-H03M 5/22, in the absence of an indication to the contrary, an invention is classified in the last appropriate place.

 H03M 5/02
·  Conversion to or from representation by pulses  [4]
 H03M 5/04
·  ·  the pulses having two levels  [4]
 H03M 5/06
·  ·  ·  Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell  [4]
 H03M 5/08
·  ·  ·  ·  Code representation by pulse width  [4]
 H03M 5/10
·  ·  ·  ·  Code representation by pulse frequency  [4]
 H03M 5/12
·  ·  ·  ·  Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code  [4]
 H03M 5/14
·  ·  ·  Code representation, e.g. transition, for a given bit cell depending on the information in one or more adjacent bit cells, e.g. delay modulation code, double density code  [4]
 H03M 5/16
·  ·  the pulses having three levels  [4]
 H03M 5/18
·  ·  ·  two levels being symmetrical with respect to the third level, i.e. balanced bipolar ternary code  [4]
 H03M 5/20
·  ·  the pulses having more than three levels  [4]
 H03M 5/22
·  Conversion to or from representation by sinusoidal signals  [4]
 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  [4]
 H03M 7/02 - 
H03M 7/50

Note(s)

In groups H03M 7/02-H03M 7/50, in the absence of an indication to the contrary, an invention is classified in the last appropriate place.

 H03M 7/02
·  Conversion to or from weighted codes, i.e. the weight given to a digit depending on the position of the digit within the block or code word  [4]
 H03M 7/04
·  ·  the radix thereof being two  [4]
 H03M 7/06
·  ·  the radix thereof being a positive integer different from two  [4]
 H03M 7/08
·  ·  ·  the radix being ten, i.e. pure decimal code  [4]
 H03M 7/10
·  ·  the radix thereof being negative  [4]
 H03M 7/12
·  ·  having two radices, e.g. binary-coded-decimal code  [4]
 H03M 7/14
·  Conversion to or from non-weighted codes  [4]
 H03M 7/16
·  ·  Conversion to or from unit-distance codes, e.g. Gray code, reflected binary code  [4]
 H03M 7/18
·  ·  Conversion to or from residue codes  [4]
 H03M 7/20
·  ·  Conversion to or from n-out-of-m codes  [4]
 H03M 7/22
·  ·  ·  to or from one-out-of-m codes  [4]
 H03M 7/24
·  ·  Conversion to or from floating-point codes  [4]
 H03M 7/26
·  Conversion to or from stochastic codes  [4]
 H03M 7/28
·  Programmable structures, i.e. where the code converter contains apparatus which is operator-changeable to modify the conversion process  [4]
 H03M 7/30
·  Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction  [4]
 H03M 7/32
·  ·  Conversion to or from delta modulation, i.e. one-bit differential modulation  [4]
 H03M 7/34
·  ·  ·  adaptive  [4]
 H03M 7/36
·  ·  Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit  [4]
 H03M 7/38
·  ·  ·  adaptive  [4]
 H03M 7/40
·  ·  Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code  [4]
 H03M 7/42
·  ·  ·  using table look-up for the coding or decoding process, e.g. using read-only memory  [4]
 H03M 7/44
·  ·  ·  Suppression of irrelevant zeroes  [4]
 H03M 7/46
·  ·  Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind  [4]
 H03M 7/48
·  ·  ·  alternating with other codes during the code conversion process, e.g. run-length coding being performed only as long as sufficiently long runs of digits of the same kind are present  [4]
 H03M 7/50
·  ·  Conversion to or from non-linear codes, e.g. companding  [4]
 H03M 9/00
Parallel/series conversion or vice versa (digital stores in which the information is moved stepwise per se G11C 19/00)  [4]
 H03M 11/00
Coding in connection with keyboards or like devices (keyboard switch arrangements, structural association of coders and keyboards H01H 13/70, H03K 17/94)  [4]
 H03M 13/00
Coding, decoding or code conversion, for error detection or error correction (error detection or error correction for analogue /digital, digital/analogue or code conversion H03M 1/00-H03M 11/00; specially adapted for digital computers G06F 11/08, for information storage based on relative movement between record carrier and transducer G11B, e.g. G11B 20/18, for static stores G11C)  [4]
 H03M 13/02
·  using n-out-of-m codes  [4]
 H03M 13/12
·  using convolutional codes  [4]
 H03M 13/22
·  using interleaving techniques  [4]