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| Number | Title | Issue Date |
| 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 signal is divided into sub-bands. A frequency of the input signal is dete... | 04/29/2008 |
| 7313492 | Method and device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis A method and a device for increasing the dynamic range and measuring accuracy of a measuring device for spectrum and/or network analysis images a high-frequency electronic signal within a frequency range into at least two spectra through a first frequency translatio... | 12/25/2007 |
| 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 information about each filter is includes inside the lid. When the case l... | 10/23/2007 |
| 7099830 | Effective deployment of temporal noise shaping (TNS) filters In the MPEG2 Advanced Audio Coder (AAC) standard, Temporal Noise Shaping (TNS) is currently implemented by defining one filter for a given frequency band, and then switching to another filter for the adjacent frequency band when the signal structure in the adjacent ... | 08/29/2006 |
| 6963727 | Direct-path-signal detection apparatus and associated methods Direct-path-signal (DPS) detector circuitry includes a standard deviation calculator circuitry configured to determine a standard deviation of a plurality of data values within a data frame. The data frame corresponds to a radio-frequency signal received via a commu... | 11/08/2005 |
| 6915264 | Cochlear filter bank structure for determining masked thresholds for use in perceptual audio coding A method and apparatus for determining masked thresholds for a perceptual auditory model used, for example, in a perceptual audio coder, which makes use of a filter bank structure comprising a plurality of filter bank stages which are connected in series, wherein ea... | 07/05/2005 |
| 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 filter section including a plurality of separate high-pass fil... | 12/17/2002 |
| 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 filters having predetermined frequency pass bands and compa... | 11/06/2001 |
| 6292002 | Crystal resonant frequency sensor A method and apparatus for measuring the frequency of a desired resonant mode of a crystal arrangement, or other two-port device, during an automated operation. The crystal arrangement, or other two-port device, is placed into a test circuit and subjected... | 09/18/2001 |
| 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 capacitor form high pass filter; A band pass filter circuit is fo... | 11/02/1999 |
| 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 digital filter bank device operates in accordance with the comp... | 11/24/1998 |
| 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 produces a first and second output corresponding to the power ... | 09/01/1998 |
| 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 regulation remote from the source for sensing the output voltage wa... | 08/04/1998 |
| 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 be detected but also band-pass filters covering frequency ... | 03/18/1997 |
| 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 error signal to compensate for the harmonic distortion. The ad... | 01/07/1997 |
| 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 signal to which have been added q spatially coherent addi... | 04/23/1996 |
| 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 radar pulses present in the Electronic Warfare (EW) enviro... | 07/05/1994 |
| 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 real-time computational requirements. The disclosed configuration ... | 03/08/1994 |
| 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 2 to 4 GHZ range) and have three filters in front of them... | 03/01/1994 |
| 5122732 | Multi-rate superresolution time series spectrum analyzer Parallel architectures preprocesses large matrices from sampled coherent time apertures receiving signals from distant sources to produce lower order matrices, derived from pseudo coherent time apertures, which are computationally less burdensome. The lar... | 06/16/1992 |
| 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 from the response of two Gaussian shaped filters whose ce... | 12/24/1991 |
| 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 rate with intervals of a predetermined duration between time... | 01/08/1991 |
| 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 steps of sampling a received signal at a rate sufficiently ... | 02/27/1990 |
| 4833631 | System for parameter identification of analog signals A system for determining the s-plane parameters, si and ri, of the transient response, ##EQU1## of a network-under-test (NUT). A filter bank, including N serially connected filter elements, has an input port and N output ports b... | 05/23/1989 |
| 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 the frequency bands, a signal under test is amplified by a ... | 03/14/1989 |
| 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 frequency signal to be identified for each analysis time, a plural... | 01/10/1989 |
| 4785474 | Emergency signal warning system A siren detection system is particularly suited for installation in an automobile for providing a warning to the driver when an emergency vehicle is in the vicinity of the automobile. The system includes a microphone mounted on the automobile. The output ... | 11/15/1988 |
| 4759069 | Emergency signal warning system A siren detection system is particularly suited for installation in an automobile for providing a warning to the driver when an emergency vehicle is in the vicinity of the automobile. The system includes a microphone mounted on the automobile. The output ... | 07/19/1988 |
| 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 filter bank has frequency-dependent band filters connected ther... | 07/12/1988 |
| 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 spectrum of the incident signal about fq, a narrow filter cent... | 04/19/1988 |
| 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 the frequencies of the first signal in the interval I to ... | 04/12/1988 |
| 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 be analyzed is divided into a plurality of frequency band... | 01/19/1988 |
| 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 filters are fed to an endpoints-detector wherein the endpoints... | 01/05/1988 |
| 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 classification can proceed by any of a number of known methods. The... | 07/07/1987 |
| 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 combination of long and short filtered data as a function of the sta... | 05/12/1987 |
| 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 having information indicative of differences with the referenc... | 04/21/1987 |
| 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 sub-bands. Zero crossing analysis is provided for each of the s... | 02/03/1987 |
| 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 Bragg cell is driven by a bandwidth expansion circuit whic... | 01/13/1987 |
| 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 any of a plurality of narrow band pass filters, such as th... | 12/09/1986 |
| 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. frequency to the second I.F. frequency, a 2 KHz bandpass ... | 12/02/1986 |
