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6534990 |
Voltage regulator wake up control using frequency detection
A generator wake-up system that transitions the voltage regulator from a low power, sleep mode to full voltage regulation mode when the wake-up system detects and confirms a valid frequency of...
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6229316 |
Measuring method by spectrum analyzer
A spectrum analyzer in which automatic setting of parameters such as band width is done by the analyzer without manual operator input and noise measurements are determined and displayed to the...
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6060837 |
Method of and apparatus for minimizing plasma instability in an rf processor
Variable reactances of a matching network connected between an r.f. source and a plasma load of a vacuum plasma chamber processing a workpiece are varied so a tendency of the plasma to change in an...
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5932998 |
System for determining fundamental frequency of an AC signal
A system for determining the fundamental frequency of a digitized AC signal is disclosed. Each signal zero crossing is detected, and in response to each zero crossing, two discrete impulses are...
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5861744 |
ABS speed signal input filter having mid-frequency attenuation
An input filter for a vehicle anti-lock brake system control module has a filter section for attenuating input signals having mid-range frequencies.
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5612617 |
Frequency detection circuit
A circuit for detecting a particular frequency out of a signal coming in over a telephone line or similar communication path. The circuit has not only a band-pass filter having a frequency band to...
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4914380 |
Signal receiving arrangement
A signal receiving arrangement comprising first and second groups (14, 16) of frequency down-converting stages (18 to 24 and 26 to 34), each stage including a mixer (40) and a local oscillator (42)...
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4810960 |
Measuring adjacent channel power
A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power...
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4459542 |
Spectrum analyzer having common two-channel filters, especially for voice recognition
A spectrum analyzer comprises a plurality of filters each provided with a low-pass output and a high-pass output both having the same cutoff frequency which is different in the case of the...
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4415854 |
Microwave spectrum analyzer with a synthesized local oscillator
A microwave spectrum analyzer comprising a first mixer which provides beats between the output of an YIG oscillator and the spectrum to be analyzed. A second mixer carries out a fixed transposition...
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4037152 |
Frequency indicating system
Disclosed is an apparatus and process for indicating or measuring the frequency of an incoming signal of unknown frequency. The system includes a plurality of processing channels, each of said...
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3965417 |
Coherent component magnitude detector
The identification of random and coherent components of an unspecified sil wherein at least a pair of band pass filters, each having the same center frequency but different bandwidths, are employed...
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3731188 |
SIGNAL ANALYSIS OF MULTIPLICATIVELY RELATED FREQUENCY COMPONENTS IN A COMPLEX SIGNAL
Apparatus including a plurality of frequency-tunable filters controlled by a frequency synthesizer in turn controlled by a variable oscillator for examining a complex signal at frequency "bins"...
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3701012 |
CIRCUIT AND METHOD FOR DEVELOPING SIGNAL INDICATIVE OF UNKNOWN FREQUENCY
An unknown signal is mixed with a first reference signal and, in a separate mixing, with a second reference signal obtained by altering the phase of the first reference signal by π/2 radians...
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3681689 |
DIFFERENTIAL FREQUENCY METER
Apparatus for measuring the frequency difference (F 1 - F 2 ) between two signals comprises two frequency change ways, each having generator means providing reference signals at frequencies f R1 ...
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3660763 |
WIDE BAND FREQUENCY EXTENDER FOR A FREQUENCY COMPARATOR
An apparatus for effectively extending the operating range of a frequency comparator is described. Input signals of close frequency are heterodyned by a common variable local oscillator to produce...
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3617882 |
SPECTRUM ANALYZER WITH VARIABLE NORMALIZING MEANS AND MEANS FOR INDICATING THE DEGREE OF NORMALIZATION
A number of signals that can vary over a wide dynamic range and having a broad range of low-frequency variation are processed by long term integration circuits and then selectably switched for...
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3581192 |
FREQUENCY SPECTRUM ANALYZER WITH DISPLAYABLE COLORED SHIFTABLE FREQUENCY SPECTROGRAM
Sound signal is analyzed so that there are provided a plurality of different constituent frequency components by means of a set of band-pass filters, and the thus analyzed frequency components are...
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3519926 |
DIGITAL WAVE ANALYSER HAVING SEQUENTIALLY SCANNED SUBSTANTIALLY IDENTICAL,LOW PASS FILTERS
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3450989 |
FREQUENCY ANALYZER FOR DETECTION OF ENERGY PEAKS
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3428893 |
SPECTRUM ANALYZER
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3395345 |
Method and means for detecting the period of a complex electrical signal
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3394309 |
Transient signal analyzer circuit
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3364425 |
Fundamental frequency detector utilizing plural filters and gates
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3243703 |
Interpolative scanner using scanned electron discharge devices having overlapping conducting intervals
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3009105 |
Electrical stroboscope
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2995707 |
Frequency detector
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2972108 |
Frequency measuring system employing frequency comparison
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2967274 |
Recording spectrum analyzer
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2963647 |
Electrical transient analyzer
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2952808 |
Frequency meter
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2936416 |
Frequency indicator
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2926304 |
Frequency determining system
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2906954 |
Non-scanning frequency analyzer
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2905893 |
Visual indicators
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2840701 |
Spectrum analyzers
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2821683 |
Waveform distortion compensator
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2796584 |
Two dimensional electroluminescent display
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