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Symbol IPC-Stellen auswählen Titel
A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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PHYSICS
H
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ELECTRICITY
H01
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ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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ELECTRONIC CIRCUITRY
H03B
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GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNERGENERATION OF NOISE BY SUCH CIRCUITS (generators specially adapted for electrophonic musical instruments G10H; masers or lasers H01S;  generation of oscillations in plasma H05H)
H03C
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MODULATION (masers or lasers H01S; coding, decoding or code conversion H03M)
H03D
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DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C, e.g. balanced modulators H03C 1/54; details applicable to both modulators and frequency-changers H03C; demodulating pulses which have been modulated with a continuously-variable signal H03K 9/00; transforming types of pulse modulation H03K 11/00; relay systems, e.g. repeater stations H04B 7/14; demodulators adapted for digitally modulated-carrier systems H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)
H03F
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AMPLIFIERS
H03G
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CONTROL OF AMPLIFICATION
H03H
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IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITSRESONATORS (measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B)
H03J
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TUNING RESONANT CIRCUITSSELECTING RESONANT CIRCUITS
H03K
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PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C;  transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D 3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) [4]
H03L
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AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (generation of oscillations H03B) [3]
H03M
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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, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) [4]
H03M 1/00
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Analogue/digital conversionDigital/analogue conversion (conversion of analogue values to or from differential modulation H03M 3/00) [4, 2006.01]
H03M 3/00
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Conversion of analogue values to or from differential modulation [4, 2006.01]
H03M 5/00
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Conversion of the form of the representation of individual digits [4, 2006.01]
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 [4, 2006.01]
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 [4, 2006.01]
H03M 7/04
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. . the radix thereof being two [4, 2006.01]
H03M 7/06
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. . the radix thereof being a positive integer different from two [4, 2006.01]
H03M 7/08
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. . . the radix being ten, i.e. pure decimal code [4, 2006.01]
H03M 7/10
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. . the radix thereof being negative [4, 2006.01]
H03M 7/12
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. . having two radices, e.g. binary-coded-decimal code [4, 2006.01]
H03M 7/14
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Conversion to or from non-weighted codes [4, 2006.01]
H03M 7/16
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. . Conversion to or from unit-distance codes, e.g. Gray code, reflected binary code [4, 2006.01]
H03M 7/18
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. . Conversion to or from residue codes [4, 2006.01]
H03M 7/20
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. . Conversion to or from n-out-of-m codes [4, 2006.01]
H03M 7/22
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. . . to or from one-out-of-m codes [4, 2006.01]
H03M 7/24
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. . Conversion to or from floating-point codes [4, 2006.01]
H03M 7/26
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Conversion to or from stochastic codes [4, 2006.01]
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 [4, 2006.01]
H03M 7/30
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Compression (speech analysis-synthesis for redundancy reduction G10L 19/00; for image communication H04N)ExpansionSuppression of unnecessary data, e.g. redundancy reduction [4, 2006.01]
H03M 7/32
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. . Conversion to or from delta modulation, i.e. one-bit differential modulation [4, 2006.01]
H03M 7/34
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. . . adaptive [4, 2006.01]
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 [4, 2006.01]
H03M 7/38
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. . . adaptive [4, 2006.01]
H03M 7/40
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. . Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code [4, 2006.01]
H03M 7/42
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. . . using table look-up for the coding or decoding process, e.g. using read-only memory [4, 2006.01]
H03M 7/44
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. . . Suppression of irrelevant zeroes [4, 2006.01]
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 [4, 2006.01]
H03M 7/48
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. . . 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, 2006.01]
H03M 7/50
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. . Conversion to or from non-linear codes, e.g. companding [4, 2006.01]
H03M 9/00
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Parallel/series conversion or vice versa (digital stores in which the information is moved stepwise G11C 19/00) [4, 2006.01]
H03M 11/00
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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 H01H 13/70, H03K 17/94) [4, 2006.01]
H03M 13/00
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Coding, decoding or code conversion, for error detection or error correctionCoding theory basic assumptionsCoding boundsError probability evaluation methodsChannel modelsSimulation or testing of codes (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, 7, 2006.01]
H03M 99/00
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Subject matter not provided for in other groups of this subclass [2006.01]
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H10
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SEMICONDUCTOR DEVICESELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR [2023.01]
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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