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H03M 1/00
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Analogue/digital conversion; Digital/analogue conversion |
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H03M 1/02
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Reversible analogue/digital converters |
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H03M 1/04
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Analogue/digital conversion; Digital/analogue conversion using stochastic techniques |
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H03M 1/06
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Continuously compensating for, or preventing, undesired influence of physical parameters |
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H03M 1/08
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Continuously compensating for, or preventing, undesired influence of physical parameters of noise |
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H03M 1/10
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Calibration or testing |
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H03M 1/12
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Analogue/digital converters |
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H03M 1/14
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Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit |
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H03M 1/16
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Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit with scale factor modification, i.e. by changing the amplification between the steps |
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H03M 1/18
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Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging |
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H03M 1/20
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Increasing resolution using an n bit system to obtain n + m bits, e.g. by dithering |
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H03M 1/22
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Analogue/digital converters pattern-reading type |
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H03M 1/24
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Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip |
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H03M 1/26
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Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip 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 |
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H03M 1/28
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Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding |
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H03M 1/30
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Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding incremental |
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H03M 1/32
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Analogue/digital converters pattern-reading type using cathode-ray tubes |
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H03M 1/34
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Analogue value compared with reference values |
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H03M 1/36
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Analogue value compared with reference values simultaneously only, i.e. parallel type |
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H03M 1/38
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Analogue value compared with reference values sequentially only, e.g. successive approximation type |
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H03M 1/40
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Analogue value compared with reference values sequentially only, e.g. successive approximation type recirculation type |
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H03M 1/42
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Sequential comparisons in series-connected stages with no change in value of analogue signal |
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H03M 1/44
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Sequential comparisons in series-connected stages with change in value of analogue signal |
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H03M 1/46
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Analogue value compared with reference values sequentially only, e.g. successive approximation type with digital/analogue converter for supplying reference values to converter |
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H03M 1/48
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Servo-type converters |
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H03M 1/50
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Analogue/digital converters with intermediate conversion to time interval |
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H03M 1/52
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Input signal integrated with linear return to datum |
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H03M 1/54
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Input signal sampled and held with linear return to datum |
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H03M 1/56
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Input signal compared with linear ramp |
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H03M 1/58
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Non-linear conversion |
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H03M 1/60
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Analogue/digital converters with intermediate conversion to frequency of pulses |
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H03M 1/62
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Non-linear conversion |
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H03M 1/64
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Analogue/digital converters with intermediate conversion to phase of sinusoidal signals |
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H03M 1/66
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Digital/analogue converters |
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H03M 1/68
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Digital/analogue converters with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits |
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H03M 1/70
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Automatic control for modifying converter range |
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H03M 1/72
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Sequential conversion in series-connected stages |
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H03M 1/74
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Simultaneous conversion |
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H03M 1/76
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Simultaneous conversion using switching tree |
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H03M 1/78
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Simultaneous conversion using ladder network |
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H03M 1/80
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Simultaneous conversion using weighted impedances |
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H03M 1/82
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Digital/analogue converters with intermediate conversion to time interval |
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H03M 1/84
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Non-linear conversion |
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H03M 1/86
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Digital/analogue converters with intermediate conversion to frequency of pulses |
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H03M 1/88
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Non-linear conversion |
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H03M 3/00
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Conversion of analogue values to or from differential modulation |
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H03M 3/02
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Delta modulation, i.e. one-bit differential modulation |
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H03M 3/04
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Differential modulation with several bits |
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H03M 5/00
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Conversion of the form of the representation of individual digits |
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H03M 5/02
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Conversion to or from representation by pulses |
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H03M 5/04
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Conversion to or from representation by pulses the pulses having two levels |
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H03M 5/06
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Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell |
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H03M 5/08
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Code representation by pulse width |
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H03M 5/10
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Code representation by pulse frequency |
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H03M 5/12
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Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code |
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H03M 5/14
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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 |
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H03M 5/16
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Conversion to or from representation by pulses the pulses having three levels |
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H03M 5/18
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Conversion to or from representation by pulses the pulses having three levels two levels being symmetrical with respect to the third level, i.e. balanced bipolar ternary code |
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H03M 5/20
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Conversion to or from representation by pulses the pulses having more than three levels |
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H03M 5/22
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Conversion to or from representation by sinusoidal signals |
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H03M 7/00
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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 |
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H03M 7/02
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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 |
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H03M 7/04
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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 the radix thereof being two |
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H03M 7/06
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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 the radix thereof being a positive integer different from two |
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H03M 7/08
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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 the radix thereof being a positive integer different from two the radix being ten, i.e. pure decimal code |
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H03M 7/10
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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 the radix thereof being negative |
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H03M 7/12
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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 having two radices, e.g. binary-coded-decimal code |
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H03M 7/14
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Conversion to or from non-weighted codes |
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H03M 7/16
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Conversion to or from unit-distance codes, e.g. Gray code, reflected binary code |
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H03M 7/18
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Conversion to or from residue codes |
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H03M 7/20
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Conversion to or from n-out-of-m codes |
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H03M 7/22
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Conversion to or from n-out-of-m codes to or from one-out-of-m codes |
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H03M 7/24
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Conversion to or from floating-point codes |
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H03M 7/26
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Conversion to or from stochastic codes |
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H03M 7/28
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Programmable structures, i.e. where the code converter contains apparatus which is operator-changeable to modify the conversion process |
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H03M 7/30
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Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction |
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H03M 7/32
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Conversion to or from delta modulation, i.e. one-bit differential modulation |
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H03M 7/34
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Conversion to or from delta modulation, i.e. one-bit differential modulation adaptive |
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H03M 7/36
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Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit |
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H03M 7/38
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Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit adaptive |
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H03M 7/40
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Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code |
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H03M 7/42
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Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory |
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H03M 7/44
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Suppression of irrelevant zeroes |
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H03M 7/46
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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 |
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H03M 7/48
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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 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 |
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H03M 7/50
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Conversion to or from non-linear codes, e.g. companding |
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H03M 9/00
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Parallel/series conversion or vice versa |
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H03M 11/00
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Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys |
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H03M 11/02
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Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys - Details |
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H03M 11/04
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Coding of multifunction keys |
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H03M 11/06
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Coding of multifunction keys by operating the multifunction key itself in different ways |
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H03M 11/08
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Coding of multifunction keys by operating the multifunction key itself in different ways by operating selected combinations of multifunction keys |
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H03M 11/10
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Coding of multifunction keys by operating the multifunction key itself in different ways by methods based on duration or pressure detection of keystrokes |
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H03M 11/12
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Coding of multifunction keys by operating the multifunction key itself in different ways by operating a key a selected number of consecutive times whereafter a separate enter key is used which marks the end of the series |
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H03M 11/14
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Coding of multifunction keys by using additional keys, e.g. shift keys, which determine the function performed by the multifunction key |
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H03M 11/16
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Coding of multifunction keys by using additional keys, e.g. shift keys, which determine the function performed by the multifunction key wherein the shift keys are operated after the operation of the multifunction keys |
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H03M 11/18
|
Coding of multifunction keys by using additional keys, e.g. shift keys, which determine the function performed by the multifunction key wherein the shift keys are operated before the operation of the multifunction keys |
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H03M 11/20
|
Dynamic coding, i.e. by key scanning |
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H03M 11/22
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Static coding |
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H03M 11/24
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Static coding using analogue means |
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H03M 11/26
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Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys using opto-electronic means |
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H03M 13/00
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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 |
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H03M 13/01
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Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes |
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H03M 13/03
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Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words |
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H03M 13/05
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Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits |
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H03M 13/07
|
Arithmetic codes |
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H03M 13/09
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Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit |
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H03M 13/11
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Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits |
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H03M 13/13
|
Linear codes |
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H03M 13/15
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Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes |
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H03M 13/17
|
Burst error correction, e.g. error trapping, Fire codes |
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H03M 13/19
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Single error correction without using particular properties of the cyclic codes, e.g. Hamming codes, extended or generalised Hamming codes |
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H03M 13/21
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Non-linear codes, e.g. m-bit data word to n-bit code word [mBnB] conversion with error detection or error correction |
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H03M 13/23
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Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using convolutional codes, e.g. unit memory codes |
|
H03M 13/25
|
Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM] |
|
H03M 13/27
|
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 using interleaving techniques |
|
H03M 13/29
|
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 combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes |
|
H03M 13/31
|
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 combining coding for error detection or correction and efficient use of the spectrum |
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H03M 13/33
|
Synchronisation based on error coding or decoding |
|
H03M 13/35
|
Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics |
|
H03M 13/37
|
Decoding methods or techniques, not specific to the particular type of coding provided for in groups |
|
H03M 13/39
|
Sequence estimation, i.e using statistical methods for the reconstruction of the original codes |
|
H03M 13/41
|
Sequence estimation, i.e using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors |
|
H03M 13/43
|
Majority logic or threshold decoding |
|
H03M 13/45
|
Soft decoding, i.e. using symbol reliability information |
|
H03M 13/47
|
Error detection, forward error correction or error protection, not provided for in groups |
|
H03M 13/49
|
Unidirectional error detection or correction |
|
H03M 13/51
|
Error detection, forward error correction or error protection, not provided for in groups n-out-of-m codes; Berger codes |
|
H03M 13/53
|
Codes using Fibonacci numbers series |
|
H03M 99/00
|
Subject matter not provided for in other groups of this subclass |
