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Symbol IPC-Stellen auswählen Titel
A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONS; TRANSPORTING
C
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CHEMISTRY; METALLURGY
D
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TEXTILES; PAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
G
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PHYSICS
H
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ELECTRICITY
H01
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BASIC ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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BASIC 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 (measuring, testing G01R; generators adapted for electrophonic musical instruments G10H; speech synthesis G10L 13/00; masers, lasers H01S; dynamo-electric machines H02K; power inverter circuits H02M; by using pulse techniques H03K; automatic control of generators H03L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; generation of oscillations in plasma H05H)
H03C
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MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in dc amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H03K 17/00 , H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65)
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; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K 9/00; transforming types of pulse modulation H03K 11/00; coding, decoding or code conversion, in general H03M; 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 (measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangements with secondary emission tubes H01J 43/30; masers, lasers H01S; control of amplification H03G; coupling arrangements independent of the nature of the amplifier, voltage dividers H03H; amplifiers capable only of dealing with pulses H03K; repeater circuits in transmission lines H04B 3/36 , H04B 3/58; application of speech amplifiers in telephonic communication H04M 1/60 , H04M 3/40)
H03G
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CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04)
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 (indicating arrangements for measuring G01D; measuring, testing G01R; remote-control in general G05 , G08; automatic control or stabilisation of generators H03L)
H03K
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PULSE TECHNIQUE (measuring pulse characteristics G01R; mechanical counters having an electrical input G06M; information storage devices in general G11; sample-and-hold arrangements in electric analogue stores G11C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H01H; static conversion of electric power H02M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H03B; modulating sinusoidal oscillations with pulses H03C , H04L; discriminator circuits involving pulse counting H03D; automatic control of generators H03L; starting, synchronisation, or stabilisation of generators 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 (of dynamo-electric generators H02P) [3]
H03L 1/00
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Stabilisation of generator output against variations of physical values, e.g. power supply (automatic control H03L 5/00 , H03L 7/00) [3]
H03L 3/00
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Starting of generators [3]
H03L 5/00
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Automatic control of voltage, current, or power [3]
H03L 7/00
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Automatic control of frequency or phaseSynchronisation (tuning of resonant circuits in general H03J; synchronising in digital communication systems, see the relevant groups in class H04) [3]
H03L 7/02
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using a frequency discriminator comprising a passive frequency-determining element [3]
H03L 7/04
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. . wherein the frequency-determining element comprises distributed inductance and capacitance [3]
H03L 7/06
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using a reference signal applied to a frequency- or phase-locked loop [3]
H03L 7/07
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. . using several loops, e.g. for redundant clock signal generation (for indirect frequency synthesis H03L 7/22) [5]
H03L 7/08
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. . Details of the phase-locked loop [3]
H03L 7/081
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. . . provided with an additional controlled phase shifter [5]
H03L 7/083
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. . . the reference signal being additionally directly applied to the generator (direct frequency synchronisation without loop H03L 7/24) [5]
H03L 7/085
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. . . concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal (H03L 7/10 takes precedence; frequency or phase detection comparison in general H03D 3/00 , H03D 13/00) [5]
H03L 7/087
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. . . . using at least two phase detectors or a frequency and phase detector in the loop [5]
H03L 7/089
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. . . . the phase or frequency detector generating up-down pulses (H03L 7/087 takes precedence) [5]
H03L 7/091
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. . . . the phase or frequency detector using a sampling device (H03L 7/087 takes precedence) [5]
H03L 7/093
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. . . . using special filtering or amplification characteristics in the loop (H03L 7/087 to H03L 7/091 take precedence) [5]
H03L 7/095
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. . . . using a lock detector (H03L 7/087 takes precedence) [5]
H03L 7/097
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. . . . using a comparator for comparing the voltages obtained from two frequency to voltage converters [5]
H03L 7/099
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. . . concerning mainly the controlled oscillator of the loop [5]
H03L 7/10
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. . . for assuring initial synchronisation or for broadening the capture range [3]
H03L 7/107
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. . . . using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth [5]
H03L 7/113
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. . . . using frequency discriminator [5]
H03L 7/12
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. . . . using a scanning signal (tuning circuits with automatic scanning over a band of frequencies H03J 7/18) [3]
H03L 7/14
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. . . for assuring constant frequency when supply or correction voltages fail [3]
H03L 7/16
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. . Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop [3]
H03L 7/18
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. . . using a frequency divider or counter in the loop (H03L 7/20 , H03L 7/22 take precedence) [3]
H03L 7/181
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. . . . a numerical count result being used for locking the loop, the counter counting during fixed time intervals [5]
H03L 7/183
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. . . . a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number [5]
H03L 7/185
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. . . . . using a mixer in the loop (H03L 7/187 to H03L 7/195 take precedence) [5]
H03L 7/187
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. . . . . using means for coarse tuning the voltage controlled oscillator of the loop (H03L 7/191 to H03L 7/195 take precedence) [5]
H03L 7/189
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. . . . . . comprising a D/A converter for generating a coarse tuning voltage [5]
H03L 7/191
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. . . . . using at least two different signals from the frequency divider or the counter for determining the time difference (H03L 7/193 , H03L 7/195 take precedence) [5]
H03L 7/193
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. . . . . the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider (pulse counters/frequency dividers H03K 21/00 to H03K 29/00) [5]
H03L 7/195
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. . . . . in which the counter of the loop counts between two different non zero numbers, e.g. for generating an offset frequency (H03L 7/193 takes precedence; pulse counters for predetermined counting H03K 21/00 to H03K 29/00) [5]
H03L 7/197
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. . . . a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division [5]
H03L 7/199
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. . . . . with reset of the frequency divider or the counter, e.g. for assuring initial synchronisation [5]
H03L 7/20
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. . . using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it (H03L 7/22 takes precedence) [3]
H03L 7/22
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. . . using more than one loop [3]
H03L 7/23
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. . . . with pulse counters or frequency dividers [5]
H03L 7/24
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using a reference signal directly applied to the generator [3]
H03L 7/26
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using energy levels of molecules, atoms, or subatomic particles as a frequency reference [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]
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR

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