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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Patent•
02 Aug 2007
TL;DR: In this paper, a Doppler radar is used to detect heartbeat motion on a chest and an analyzer connected to one of the transmitter and receiver is configured to use the model during an operational phase to estimate blood pressure.
Abstract: A heart monitoring system for a patient includes an 802 protocol transmitter; an 802 protocol receiver adapted to communicate with the 802 transmitter, the 802 protocol transmitter and receiver forming a Doppler radar to detect heartbeat motion on a chest; and an analyzer connected to one of the transmitter and receiver. The analyzer calibrates a Doppler radar signal with an actual blood pressure during a training phase to develop a model. The analyzer is configured to use the model with the Doppler radar signal during an operational phase to estimate blood pressure.
234 citations
TL;DR: Cepstral techniques appear to be even more reliable and efficient than visual methods for pitch detection, and to produce high‐resolution spectra without utilizing either heterodyning methods or bandpass filter banks.
Abstract: A spectrum analyzer based on a definition of short‐time power spectra has been designed and simulated on a digital computer. The analyzer is primarily intended for use in speech analysis. It has been designed to operate in real time, and to produce high‐resolution spectra without utilizing either heterodyning methods or bandpass filter banks. The logarithm of each consecutive amplitude spectrum thus obtained can be used as the input to a second similar spectrum analyzer. The output of this analyzer is then the “cepstrum” or power spectrum of the logarithm spectrum. The cepstrum of a speech signal has a peak corresponding to the fundamental period for voiced speech but no peak for unvoiced speech. Thus, a cepstrum analyzer can function both as a pitch and as a voiced‐unvoiced detector. Cepstral pitch detection has the important advantages that it is insensitive to phase distortion, and is also resistant to additive noise and amplitude distortion of the speech signal. The method does not require the presence of the fundamental frequency in the speech signal, and will give several separate cepstral peaks if several different pitch periods are present. Cepstral techniques appear to be even more reliable and efficient than visual methods for pitch detection. The short‐time spectrum and cepstrum analyzers described in this paper were simulated by a sampled‐data system on an IBM‐7090 digital computer. The simulation was programmed with the assistance of a special block‐diagram compiler.
219 citations
TL;DR: In this article, the polar angular distribution of entering particles is spatially imaged onto a position sensitive detector at the annular exit aperture after a deflection through 90 deg. This detector uses a quadrispherical geometry, but has a completely uniform 360 deg fan-shaped field of view.
215 citations
TL;DR: In this paper, a high resolution MS/MS instrument comprising electrostatic analyzer, magnetic sector, electrostatic analyser, and EBE is described, which is used for high resolution mass selection, high dynamic range and good transmission for collision induced decomposition (CID) fragments.
213 citations
Patent•
07 Aug 1995
TL;DR: A vehicle analyzer and tutorial system is provided in this article, which includes a remote controller and display unit, operably interconnected with the engine analyzers and display units through a radio frequency interface, for remotely monitoring the analyzer display and for controlling the analyzers.
Abstract: A vehicle analyzer and tutorial system is provided. The unit includes an engine analyzer and display unit. The unit further includes a remote controller and display unit, operably interconnected with the engine analyzer and display unit through a radio frequency interface, for remotely monitoring the engine analyzer display and for controlling the engine analyzer.
200 citations