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7365527 |
System and method for extending the range of a frequency measuring device
A range of a frequency measuring device having limited range is extended by pre-processing an input signal. The input signal is divided into a plurality of channels. In each channel, the input...
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7285945 |
Fixed filter assembly for proof of performance testing on CATV systems
A fixed filter assembly kit includes a plurality of filters with associated terminals inside a case. A booklet disclosing which filters are associated with which terminals as well as technical...
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6495998 |
Selectable band-pass filtering apparatus and method
A selectable band-pass filtering apparatus for use at the input of analysis instrumentation, such as a spectrum analyzer for testing a multi-channel communication system, comprises a high-pass...
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6313620 |
Detector system for identifying the frequency of a received signal useful in a channelized receiver
A method, and apparatus for accomplishing the method, for determining the frequency of an RF signal that operates by sequentially applying a received RF signal to sequentially selected individual...
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5978487 |
Spectrum displaying device for audio device
A spectrum display device for audio use includes a first differential amplifier circuit and a first capacitor forming a low pass filter. A second differential amplifier circuit and a second...
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5841681 |
Apparatus and method of filtering a signal utilizing recursion and decimation
Digital filter bank device that operates in a frequency-time hierarchically arranged, recursively fed back scheme based on the concept of decimation of a multi-speed-rate-operated system. The...
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5801525 |
Frequency discriminating power sensor
A power sensor that enables determination of the frequency of a microwave signal comprises a signal input that receives the microwave signal at a particular frequency, at least one sensor that...
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5789928 |
Circuit and method for discriminating the source of waveform distortion in an electric power generation and distribution system
A circuit to discriminate the source of harmonic distortion of the output voltage comprises voltage sensors coupled to the output terminals of a source of electric power and to a point of...
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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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5592346 |
Control system utilizing an adaptive predictor to compensate for harmonic distortion
An adaptive predictor for use with a control system to predict error contributions due to harmonic distortion in a error signal such that the prediction signal may be fed back and added to the...
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5511008 |
Process and apparatus for extracting a useful signal having a finite spatial extension at all times and which is variable with time
A process for the extraction of a time-variable useful signal having a finite spatial extension by an array of N sensors or transducers (N being equal to or greater than 3), that receive the useful...
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5327142 |
Frequency encoding circuit in Bragg cell receiver
The circuit may be used to encode the channel outputs of a Bragg cell receiver, or other type of channelized receiver. Bragg cell receivers use acousto-optic delay lines to analyze signals such as...
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5293114 |
Frequency measurement receiver with means to resolve an ambiguity in multiple frequency estimation
In multiple frequency estimation, the bandwidth and resolution of Fast Fourier Transform (FFT) based frequency estimators are limited by A/D converter sampling rate constraints and also by...
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5291125 |
Instantaneous frequency measurement (IFM) receiver with two signal capability
An IFM (Instantaneous Frequency Measurement) receiver is disclosed that can process two simultaneous signals for electronic warfare application. Three IFM receivers are employed (cooperating in the...
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5075619 |
Method and apparatus for measuring the frequency of a spectral line
A method and apparatus are disclosed, that is suitable for digital or analog spectrum analyzers, for accurately and rapidly ascertaining the frequency of a spectral line by determining its location...
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4983919 |
Frequency response detection apparatus
An apparatus for detecting frequency response of audio signals of left and right channels. The audio signals of the left and right channels are alternately introduced at a predetermined periodic...
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4904930 |
Method of carrier frequency estimation
A method is provided for searching a wide, high-noise frequency band for a narrow, phase-modulated signal to determine the approximate carrier frequency of a data signal. The method comprises the...
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4833631 |
System for parameter identification of analog signals
A system for determining the s-plane parameters, s i and r i , of the transient response, ##EQU1## of a network-under-test (NUT). A filter bank, including N serially connected filter elements, has...
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4812743 |
Method and apparatus for detecting a narrowband signal
In a method and apparatus for discriminating between a broadband unipolar signal having a component within one or more of three predetermined frequency bands and a narrowband signal within one of...
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4797931 |
Audio frequency signal identification apparatus
An audio frequency signal identification apparatus of the present invention has a correlator for obtaining the full band power component and autocorrelation coefficients of a digital audio...
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4757253 |
Circuit arrangement for frequency analysis of received signals which lie in a wide overall frequency band
A circuit arrangement for a frequency-dependent analysis of received signals which lie in a wide overall frequency band utilizes a filter bank which cooperates with an evaluation circuit. The...
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4739251 |
Analysis circuit for an amplitude-modulated electric signal comprising a frequency transposer
Circuit for analyzing an amplitude-modulated electric signal. This circuit comprises a quartz oscillator operating at a frequency fq, a frequency transposer making it possible to transpose the...
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4737713 |
Apparatus and method for processing an electrical signal and increasing a signal-to-noise ratio thereof
An apparatus and method for processing a first electrical signal having a frequency interval I containing information, and increasing the signal-to-noise ratio thereof utilizes a mixer for shifting...
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4720674 |
Doppler signal analyzing apparatus
A Doppler signal analyzing apparatus is capable of frequency analysis of a Doppler signal with frequency and time resolutions that match the frequency band of a signal to be analyzed. The signal to...
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4718097 |
Method and apparatus for determining the endpoints of a speech utterance
A speech utterance is supplied to a control circuit which includes a plurality of band-pass filters and a maximum value detector coupled to the filters. The maximum value of the outputs of the...
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4678987 |
Feature extractor for quasi-periodic signals
The purpose of the disclosed structure is to extract features from the emissions of quasi-periodic signal sources, such as piston engine powered vehicles and the like, after which pattern...
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4665486 |
Method and apparatus for reducing statistical variations in nuclear well logs
Statistical variations in nuclear borehole logs are reduced using digital moving average data processing while maintaining responsiveness to formation changes, by transitioning through a...
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4660215 |
Transmitter/receiver system
A transmitter/receiver system for converting digital information into a multi-frequency signal for transmission. A reference frequency signal is first transmitted, then a series of frequencies...
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4640134 |
Apparatus and method for analyzing acoustical signals
A zero-crossing accoustical signal analyzer includes a plurality of parallel-connected adjacently tuned filter channels to separate an incoming accoustical signal into a plurality of adjacent...
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4636718 |
Acousto-optical spectrum analyzer with expanded frequency resolution
This invention is directed to a spectrum analyzer system which is laser-driven and which includes a standard Bragg cell and a standard photo-diode array as the output detector. In this system, the...
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4628255 |
AGC technique for spectrum analyzers
An automatic gain control system is disclosed which utilizes a voltage coolled vario-losser means to vary the AGC System output. The control voltage is derived from the lowest detected level from...
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4627079 |
Method and apparatus for acquiring and tracking a communications signal
A receiver is disclosed for acquiring and tracking a data signal in a highly stressed environment. The receiver comprises first and second I.F. sections, a mixer for translation from the first I.F....
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4612665 |
Graphic equalizer with spectrum analyzer and system thereof
A graphic equalizer comprises an equalizer for separately level adjusting the input signal for each of a number of divided frequency bands which are different from each other, control knobs...
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4599567 |
Signal representation generator
An apparatus and method for generating a representation of an arbitrary signal wherein the signal is represented as a sum of reference signals derived from a standard wavelet defined on a grid in...
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4584711 |
Steady state channel select
In a wide band receiver, a pulse signal is directed through a plurality of narrow band channels. The pulse input is a short duration pulse of several cycles of the signal. The energy content in...
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4556982 |
Energy discriminating channel select logic
A pulse signal is received at the input of a wide band receiver. The signal is then processed through a plurality of narrow band channels. Each of the narrow band channels are compared to adjacent...
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4541070 |
Pulse characteristic meter
A pulse characteristic meter comprises n integrated converters having nonlinear amplitude response and one integrated converter having linear amplitude response which provide linear and nonlinear...
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4504968 |
Equalizer apparatus having two dimensional display
In a presettable graphic equalizer for use in a car stereo or the like, a display device capable of two-dimensional display is disposed, whereby a frequency characteristic presently given to audio...
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4492917 |
Display device for displaying audio signal levels and characters
A level display device for audio signal comprises a plurality of bandpass filters having filtering bands of respectively different center frequencies, for band-dividing and filtering an input...
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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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4454470 |
Method and apparatus for frequency measurement of an alternating current signal
A scheme for measuring the frequency of an alternating current signal provides for the development of first and second values which are respectively representative of the time the alternating...
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4443757 |
Multiplexed electrical signal processor
A multiplexed filter with n channels comprises at least one amplifier G 2 with n feedback capacitors C 5 to C 8 associated with the switches S 5 to S 8 . A switch-controlled resistance R 2 (C'...
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4390838 |
Broadband measurement system
A system for making emission measurements of RF electromagnetic energy, s as interference, over a relatively wide bandwidth without tuning or scanning and without the knowledge of the specific...
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4385208 |
Multifrequency receiver
In a multifrequency receiver, a threshold level (VTH) supplied to a group of threshold comparators (105-1 through 105-N) is controllably adjustable by a variable threshold generation circuit (104)...
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4380732 |
Signal spectrum display apparatus
A signal spectrum display apparatus comprises a plurality of band-pass filters respectively having filtering bands of different center frequencies and operating to filter an input signal thereby to...
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4377961 |
Fundamental frequency extracting system
A system for extracting the fundamental frequency or pitch of complex waves such as voice, musical instruments or other audio signals. Separate channels extract the fundamental frequency component...
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4344031 |
Method and device for verifying signals, especially speech signals
The characteristic values are obtained from the signal to be verified, e.g. in the case of a voice signal the total energy in the individual frequency spectrum ranges, and these characteristic...
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4339711 |
Spectrum displaying apparatus for multichannel signals
An apparatus for displaying the spectrum of multichannel signals includes band-pass filtering circuits of a plurality of channels provided to respectively correspond to the channels of a plurality...
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4307340 |
Spectrum display apparatus
A spectrum display apparatus comprises a plurality of band-pass filters respectively having filtering bands of different center frequencies and operating to filter an input signal thereby to...
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4301454 |
Channelized receiver system
A channelized receiver system for use in conjunction with a scanning antenna wherein a received rf signal is provided to a plurality of filters each of which has a passband corresponding to a...
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