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About 10,000 papers for “Spectrum analyzer”

Handheld Spectrum Analyzer

Jahanbakhsh, Sanaz, Pak, Johnny, Sikder, Naureen et al. · Summit (Simon Fraser University) · 2007

The lack of user-friendly analyzers has made it difficult for musicians and other sound-based professions to reliably optimize the clarity of their performance. Despite the availability of digital sound conversion and optimization solutions in the market, only a handful of devices can detect the sources of interference anywhere. It is also important to ensure that sound quality is evenly distributed and perceived to be acceptable throughout the venue. The measured power distribution over various frequency ranges can be used to tune and arrange musical equipment to optimize the sound quality experienced by the audience.\nThe Handheld Spectrum Analyzer is a device that analyzes the spectrum of input sound sources received from either audio equipment or the surrounding environment. In addition, the device allows the user to move throughout the working area and observe the different power distributions of the sound spectrum. The proof-of-concept prototype for our Handheld Spectrum Analyzer should be able to accept surrounding sound as input, calculate its frequency spectrum and display its corresponding power bar graphs on the display unit. Furthermore, the device’s interface will tentatively have other features, such as allowing the user to save and store captured spectrums for future comparisons. 

Cited by 0

Spectrum Analyzer Interface

Stephen R. Williams, Michael G Kleber · Opus: Research & Creativity (Indiana University – Purdue University Fort Wayne) · 1999

Cited by 0

Optical spectrum analyzer

HATORI, MASAMI · Institutional Repository of Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (Xian Institute of Optics and Precision Mechanics) · 1991

An optical spectrum analyzer includes a surface elastic wave generator for generating in an optical waveguide a surface elastic wave which has a continuously varying frequency and which diffracts and deflects a guided wave as it travels across the path of the guided wave, which guided wave is introduced as a measured light beam into and travels in the optical wave guide. The measured light beam which has been deflected is emitted from the optical waveguide and detected by a light detector. A modulator turns on and off or modulates the surface elastic wave by repeatedly energizing and de-energizing the surface elastic wave generator, the frequency of the modulation being lower than the continuously varying frequency. A filter receives a signal corresponding to the modulation frequency from the modulator and a signal corresponding to the measured light beam from the detector, and extracts a signal component having the same frequency as the modulation frequency from the signal received from the light detector. The frequency of the surface elastic wave is detected on the basis of the signal component extracted by the filler when the measured light beam is detected by the light detector.

Cited by 0Open access

Spectrum analyzer measurements

Karlo Prpić · Repository of the University of Rijeka · 2020

Analizatori spektra primjenjuju se u različitim granama elektroničke industrije. Od terenskih mjerenja mobilnih mreža i sustava digitalne televizije do laboratorijskih mjerenja i razvoja sljedeće generacije tehnologije. Ovaj napredni uređaj omogućava nam brzu, preciznu i uspješnu analizu signala od interesa. Pruža nam mogućnost jednostavnijeg provođenja konvencionalnih mjerenja. Samim time nam olakšava detekciju određenih grešaka u sustavu što u konačnici rezultira pravovremenim poduzimanjem potrebnih radnji u svrhu otklanjanja poteškoća. U ovom radu definirane su bitne razlike između vremenske i frekvencijske domene te metode prelaska iz jedne u drugu. Istaknute su prednosti pojedinih vrsta analizatora spektra koji se danas koriste, kao i njihovi nedostatci. Princip rada uređaja, njegove osnovne značajke te vrste mjerenja koja je sposoban izvršiti detaljnije su pojašnjeni, te nam daju uvid u opseg mogućnosti modernih analizatora spektra.

Cited by 0

RF SPECTRUM ANALYZER.

Defense Technical Information Center (DTIC) · 1963

The RF Spectrum Analyzer was developed for the visual display of amplitude and frequency of RF signals in the frequency range of 100 to 1000 MC. The frequency range is displayed in four swept bands on a 5 in. oscilloscope screen. The spectrum analyzer has sweep coverage up to 300 MC electronically with high resolution, with no spurious responses and no internally generated interference. It is useful as a search receiver, spectrum analyzer, noise interference analyzer or as monitoring equipment. (Author)

Cited by 0

Audio spectrum analyzer

Ovsec, Janez · Repository of the University of Ljubljana (University of Ljubljana) · 2025

V diplomski nalogi je bil zasnovan, izdelan in funkcionalno preizkušen avdio spektralni analizator, ki temelji na mikrokrmilniku Teensy 4.0, z namenom prikaza frekvenčne vsebine analognega zvočnega signala v realnem času. Naprava je bila razvita kot samostojen sistem, ki zajema zvočni signal preko elektretnega mikrofona, ga ustrezno analogno obdela, izvede digitalno analizo signala s pomočjo hitre Fourierjeve transformacije (FFT) in prikaže rezultat v obliki grafičnega prikaza na standardnem 16x2 znakovnem LCD zaslonu. Sistem je sestavljen iz treh ključnih sklopov: vhodnega analognega vezja, digitalnega mikrokrmilniškega dela in prikazovalnika. Analogni del vključuje mikrofon ter aktivni pasovno-propustni filter s teoretičnim ojačanjem 100 in prepustnim območjem med 16 Hz in 16 kHz. V praksi se je pri meritvah izkazalo, da ojačanje znaša približno 70, vendar to ne vpliva bistveno na delovanje, saj je signal še vedno dovolj močan za digitalizacijo. Digitalni del temelji na knjižnicah Audio.h za zajem in FFT obdelavo ter LiquidCrystal.h za prikaz rezultatov. Zaslon prikazuje 32-stolpčni bar-diagram z uporabo definiranih znakov, pri čemer vsak stolpec predstavlja povprečje dveh frekvenčnih binov iz 256-točkovne FFT. Prikaz zajema frekvence do približno 11 kHz, kar je bilo izbrano kot praktičen kompromis med ločljivostjo, preglednostjo in učinkovitostjo prikaza. Delovanje sistema je bilo preizkušeno z generiranjem sinusnih tonov iz mobilnega telefona. Frekvence so bile ustrezno zaznane in prikazane, kar potrjuje funkcionalnost celotnega sistema. Nadalje je bilo potrjeno, da je sistem sposoben mehko realnočasnega delovanja, saj se prikaz osvežuje približno 28-krat na sekundo (glede na LED indikator), kar je dovolj hitro za tekoče sledenje spremembam v zvoku. Projekt uspešno združuje analogno elektroniko in digitalno obdelavo signalov ter predstavlja praktičen in dostopen primer DSP-sistema za zvočno analizo. Sistem je bil razvit z uporabo enostavnih in komercialno dostopnih komponent, zato je primeren tudi za nadaljnji razvoj, nadgradnjo ali uporabo v izobraževalne namene. Med možnimi izboljšavami so povečanje prikaznega območja, uporaba večjega zaslona, izboljšano napajanje, brezžični prenos podatkov ali vizualizacija s pomočjo LED trakov.

Cited by 0Open access

Optical spectrum analyzer

MOON, JOHN A., SIRKIS, JAMES S., JONES, RALPH et al. · Institutional Repository of Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (Xian Institute of Optics and Precision Mechanics) · 2007

An optical spectrum analyzer (OSA) 10 sequentially or selectively samples (or filters) a spectral band(s) 11 of light from a broadband optical input signal 12 and measures predetermined optical parameters of the optical signal (e.g., spectral profile) of the input light 12. The OSA 10 is a free-space optical device that includes a collimator assembly 15, a diffraction grating 20 and a mirror 22. A launch pigtail emits into free space the input signal through the collimator assembly 15 and onto the diffraction grating 20, which separates or spreads spatially the collimated input light, and reflects the dispersed light onto the mirror 22. A λ/4 plate 26 is disposed between the mirror 22 and the diffraction grating 20. The mirror reflects the separated light back through the λ/4 plate 26 to the diffraction grating 20, which reflects the light back through the collimating lens 18. The lens 18 focuses spectral bands of light (λ1–λN) at different focal points in space. One of the spectral bands 11 is focused onto a receive pigtail 28, which then propagates to a photodetector 30. A pivoting mechanism 34 pivots the diffraction grating 20 or mirror 22 about a pivot point 36 to sequentially or selectively focus each spectral band 11 to the receive pigtail 28. A position sensor 42 detects the displacement of the diffraction grating 24 or mirror.

Cited by 1Open access

Analog spectrum analyzer

Pavel BUŠEK · Digital Repository (National Repository of Grey Literature) · 2012

The task of this bachelor thesis was to build and measure a simple spectrum analog analyzer. Analyzer works with active frequency filters. The first part of the thesis introduces principles of the theory of frequency filters. The second part deals with development of eight-pass frequency analyzer and measurement of its parameters.

Cited by 0

RF IMPULSE SPECTRUM ANALYZER

Defense Technical Information Center (DTIC) · 1953

An analyzer is being developed which will be continuous over the 150-kc to 1-kmc range and will be used in the measurement of the absolute spectral intensity of very short, separated, repetitious pulses. Research indicated that a possible solution to the problem is the use of a series of cascaded and synchronously tuned RLC shunt circuits (designated as a CASTA) with vacuum-tube isolation between stages. An approximate expression for the impulse response of n-cascaded shunt-tuned circuits is given. A search for some relationship between this expression and an easily measurable characteristic was made. The results showed that when the envelope function itself was considered to be a driving pulse for a succeeding cascaded parallel-tuned RLC circuit, a simple relationship existed between the initiating impulse and the response of this second cascaded set of tuned circuits. An analysis of the response of a CASTA for both single and repeated impulses is appended. An area method for measuring the absolute spectral intensity is also described in an appendix.

Cited by 0

Josephson Based Spectrum Analyzer

L. Palafox, Jonas Herick, R. Behr et al. · 2018

Differential measurements relative to a Josephson waveform provide very accurate measurements of ac waveforms. Pulse driven arrays, used in Josephson Arbitrary Waveform Synthesizers, can generate sine waves with very high spectral purity. These two Josephson based measurement tools can be combined to study undesired distortion components present in the frequency spectrum of high quality waveform generators. For a proof of principle experiment, we cancelled the fundamental tone of a waveform and measured the third harmonic that was generated.

Cited by 2

A micromechanical spectrum analyzer

Nikhil Dilip Sheth · Purdue e-Pubs (Purdue University System) · 2011

Over the past two decades, progress in the development and deployment of radio-frequency wireless communication devices has created a need for improved system performance in signal processing systems, particularly with respect to component size, battery life, power consumption and cost. These stringent requirements have generated considerable interest in microelectromechanical systems (MEMS), due their distinct utility in practical applications, which stems from their small size, fast response, low power consumption, and near-seamless integrability with on-chip electronics. The current work follows this trend by gainfully employing MEMS technology in the development of a chip-scale mechanical spectrum analyzer. Specifically, a microresonator array architecture, consisting of frequency mistuned microbeams that are elastically coupled through a common shuttle mass, has been developed. A form of vibration localization is exploited in this device, wherein the central shuttle mass, facilitates signal distribution, while each mistuned microbeam creates a frequency band that can be used in mechanical spectral decomposition. This novel approach offers one route to real-time spectral analysis with a simple, low-power, chip-scale device. The system is modeled and analyzed using a lumped parameter approach and then designed using the finite element method. A set of design guidelines is introduced to ensure the existence of mode localization in the device and the attainment of desired performance metrics. A recipe for a three step microfabrication procedure and possible directions for future work are also presented.

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