Topic
Spectrum analyzer
About: Spectrum analyzer is a research topic. Over the lifetime, 12217 publications have been published within this topic receiving 101851 citations.
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TL;DR: High-resolution single-pulse spectra of a typical commercial dye laser are measured and analyzed and frequency jitter, i.e., shifts of the whole frequency comb, was observed and appeared to be very fast and hence cannot be explained by technical noise alone.
Abstract: We have measured and analyzed high-resolution single-pulse spectra of a typical commercial dye laser. The longitudinal mode structure was resolved by using a Fizeau interferometer as the spectrum analyzer. In mode intensities we observed strong pulse-to-pulse fluctuations that are caused mainly by the variations of the spontaneous emissions to the laser modes during the starting phase of the laser pulse. Apart from the quantum noise, frequency jitter, i.e., shifts of the whole frequency comb, was also observed. The jitter appeared to be very fast, of the order of a few megahertz and hence cannot be explained by technical noise alone. A detailed knowledge of the spectral fluctuations is needed in theoretical models of noise effects in nonlinear spectroscopy. It can also be applied to novel noise reduction techniques.
30 citations
TL;DR: In this article, a cylindrical mirror photoelectron energy analyzer suitable for measuring photo-electron branching ratios is described, which incorporates a pre-retarding/accelerating system.
30 citations
TL;DR: In this article, a novel charged particle energy analyzer of simple geometry is described and a ray trace program using these components is discussed and results of its application are presented in graphical and tabular form also presented are experimental results for two versions of the analyzer in the form of representative spectra of well known species (Ar +, H 2 +, O 2 + ).
30 citations
13 Sep 2004
TL;DR: An on-chip jitter-spectrum analyzer implemented in 0.18/spl mu/m CMOS can locate and analyze trouble-spots in on- and off-chip power and clock distribution networks during the actual operations in the field.
Abstract: An on-chip jitter-spectrum analyzer (JSA) implemented in 0.18/spl mu/m CMOS can locate and analyze trouble-spots in on- and off-chip power and clock distribution networks during the actual operations in the field. A feedback design-flow using JSA improves the performance of 1GHz digital LSIs.
30 citations
Patent•
21 Mar 1985TL;DR: In this paper, a digital graphic equalizer includes a pulse-sequence generator for generating a sequence of pulse signals, a first digital signal processor for filtering the pulse signals to produce a filtered signal, a digital-to-analog converter responsive to the filtered signal for producing a calibrated signal, and a loudspeaker responsive to calibrating signal for propagating a calibrated sound in a listening environment, the frequency characteristics of the calibrating sound being subject to modification by the listening environment.
Abstract: A digital graphic equalizer includes a pulse-sequence generator for generating a sequence of pulse signals, a first digital signal processor for filtering the pulse signals to produce a filtered signal, a digital-to-analog converter responsive to the filtered signal for producing a calibrating signal, and a loudspeaker responsive to the calibrating signal for propagating a calibrating sound in a listening environment, the frequency characteristics of the calibrating sound being subject to modification by the listening environment. A detector detects the calibrating sound as propagated in the listening environment and produces a detection signal representative thereof. An analog-to-digital converter is responsive to the detection signal for producing a digital signal corresponding thereto, and a second digital signal processor is responsive to the digital signal for producing a plurality of frequency-divided signals. A spectrum analyzer is responsive to the frequency-divided signals for analyzing the frequency characteristics of the calibrating sound as propagated in the listening environment and producing a compensating signal adapted to compensate for the modification by the listening environment of the frequency characteristics of the calibrating sound.
30 citations