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4078216 |
Circuit for the parallel coupling of audio frequency central-control transmitting stations in a wave band filter construction
A circuit for the parallel coupling of audio frequency transmitting stations in a wave band filter construction is described, in which the wave band filter consists of two resonant circuits tuned...
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4053820 |
Active filter
An active filtration system is described which may be particularly useful for filtering undesired harmonics of the fundamental AC frequency produced by AC to DC or DC to AC conversion. The...
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4017812 |
Method of processing a signal, and corresponding devices
In the synchronous detection signals of frequency Fo immersed in a noise, an auxiliary signal is produced having a period 1/2 Fo and in the form of a rectified symmetrical wave, by rectifying a...
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3935551 |
Filter arrangement for a converter circuit
An improved filtering arrangement for a converter circuit in which a highpass filter, tuned to have a cutoff frequency which is less than the lowest harmonic to be filtered is provided instead of...
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3925739 |
Radio frequency notch filter
A radio frequency notch filter includes a transformer secondary winding connected in series with a transmission line. The transformer primary winding is arranged with a capacitor to be parallel...
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3924223 |
Power line communication system having a protective terminating impedance arrangement
A terminating impedance network is disclosed for communication signals transmitted by a power line carrier communication system to the premises of residential customers of an electric utility....
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3868605 |
Adaptable notch filter
The present invention modifies a 2-stage Biquad notch filter by adding an inverter at the input to each stage and by replacing certain of the Biquad resistors with a set of resistors in the filter...
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3849677 |
HYBRID POWER FILTERS EMPLOYING BOTH ACTIVE AND PASSIVE ELEMENTS
A hybrid power filter employing both active and passive filtering elements retaining the advantages of these elements while overcoming the main disadvantages of each when used separately. In one...
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3745416 |
A. C. POWER SYSTEM COUPLINGS
In a short-circuit limiting coupling comprising a series combination of inductance and capacitance tuned to power-system frequency, at least a portion of the capacitance is connected in parallel...
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3715673 |
NOISE SUPPRESSION FOR COMMUNICATION CABLES
Noise developed along the sheath (or shield) of a communications cable, is bucked out by means of an amplifier-transformer combination located in proximity to the terminal facility which receives a...
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3708620 |
BANDPASS AMPLIFIER
A bandpass amplifier having a double tuned resonant circuit is shown. The double tuned circuit has a parallel resonant circuit connected in series with a series resonant circuit which provides at...
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3603901 |
LINE TRAP
A line trap comprising a coil formed by winding a strip of electrically conducting material in convolutions, a supporting frame made of an insulating material for supporting the convolutions of...
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3603900 |
DISTRIBUTED CONSTANT RC NETWORK
Distributed constant RC network apparatus is provided in accordance with this invention having a pair of complex attenuation poles which reside on the plane defined by the complex angular frequency...
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3585538 |
NOTCH REJECTION FILTER
A filter which completely suppresses one frequency has one center tapped inductance connected in parallel with a condenser, and a resistor having one terminal connected to the center tap of said...
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3579154 |
VHF FILTER HAVING ABSORPTIVE TUNED SECTION TO ELIMINATE NARROW SPURIOUS PASSBAND
Disclosed is a very high frequency filter for use with a high frequency radio transmitter which prevents transmission of harmonics. The filter includes an absorptive filter which eliminates...
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3571767 |
ELECTRICAL FILTER ARRANGEMENT
This invention relates to a highly selective electrical filter network composed of passive circuit elements and capable of attenuating or "notching" only selected frequencies from a band while...
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3562417 |
SIGNAL-TRANSLATING FILTER NETWORK FOR A TELEVISION RECEIVER
Three tuned signal attenuation circuits are usually needed between the RF tuner and first IF amplifier in a television receiver for adjusting the relative amplitudes of the components of the IF...
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3555291 |
POWER SYSTEM FILTER
A harmonic filter for an AC power system, particularly for converter installations, which provides damping to diminish the effects of parallel resonance. The filter consists of a plurality of...
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3544924 |
VARIABLE DELAY ARRANGEMENT IN A LADDER NETWORK USING SIGNALS RELATED TO THE INPUT FED TO THE SHUNT ELEMENTS TO AFFECT THE POLES AND ZEROES OF THE TRANSFER FUNCTION
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3519737 |
RESONANT BANDPASS FILTER HAVING TWO UNDESIRED FREQUENCY CANCELLATION TRAPS
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3504310 |
ACCESSIBLE LINE TRAP TUNING UNIT
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3487339 |
INTERMEDIATE FREQUENCY COUPLING NETWORK HAVING A SHARPLY TUNED SOUND CARRIER CANCELLATION TRAP INDUCTIVELY COUPLED TO THE INPUT CIRCUIT
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3453565 |
ADJUSTABLE HARMONIC TRAP WHOSE TUNING TRACKS THE TUNING OF PASS BAND MEANS
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3452303 |
BANDPASS NETWORK HAVING A HIGH ATTENUATION REJECTION CHARACTERISTIC
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3435386 |
SERIES RESONANT TRAP AND METHOD OF MAKING SAME
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3411098 |
Variable q notched filter
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3396341 |
I. f. filter for television tuner
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3336438 |
Chrominance takeoff circuit
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3316511 |
Passive gas cell frequency standard in the millimeter wave range
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3290578 |
Multi-phase converter including a harmonic filter
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3281646 |
Solid state frequency multiplier network in which the input and output circuits are electrically isolated from each other
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3271705 |
Electric wave filter
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3223941 |
Adjustable frequency bridge circuit
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3217275 |
Multicoupler system utilizing tunable trap
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3217096 |
Signal coupling and trap network
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3188566 |
Intermodulation measurement system including resonant filter trap means
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3114889 |
Desired frequency coupling circuit having undesired frequency cancellation trap located at voltage null point for desired frequency
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3099808 |
Channel tuning system for signal receivers in which tuning components assigned to unselected channels form part of adjacent channel traps
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3074026 |
Variable attenuation sharp notch filter
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3042884 |
High q tuned network utilizing biased double-base diode as inductive element
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3038113 |
Series-transformer circuit
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3008081 |
Frequency-transformation device comprising at least one non-linear element
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2986706 |
Coupling reducing apparatus
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2982928 |
Electric filter
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2959738 |
System of eliminating the higher harmonic voltage of any alternating current circuit
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2945136 |
Harmonic distortion eliminator for a.c. generator
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2936420 |
Electron discharge device circuit arrangements
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2934722 |
Signal-translating networks
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2907960 |
Signal transfer apparatus
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2906873 |
Discriminator circuit
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