نتایج جستجو برای: echo g

تعداد نتایج: 470649  

Journal: :Scholarpedia 2007

Journal: :Ultrasonics 2004
Yoshifumi Saijo Shin-ichi Nitta Kazuto Kobayashi Hitoshi Arai Yukiko Nemoto

In practical cardiology, a stethoscope based auscultation has been used to reveal the patient's clinical status. Recently, several hand-held echo devices are going on market and they are expected to play a role as "visible" auscultation instead of stethoscope. We have developed a portable and inexpensive echo device which can be used for screening of cardiac function. Two single element transdu...

2012
E. S. Mananga R. Roopchand Y. S. Rumala G. S. Boutis Guy R. Brewer

This work focuses on analyzing the dynamics of spin I=1 nuclei evolving under a simple two pulse echo cycle and a magic echo cycle by average Hamiltonian theory. The work highlights how spectral artifacts introduced by finite pulse widths can be removed by cycling the phases of the receiver and transmitter in a well defined way. In addition, it is shown that a magic echo cycle can refocus both ...

2017
Tejendra Pratap Singh

-This paper presents the Cancellation of an acoustic echo. Such echo canceller is essential to control the echoes generated by the acoustic coupling between the microphone and loudspeaker in hands free telephones or teleconferencing applications. Conventional acoustic echo canceller encounters problems like slow convergence rate (especially for speech signal) and high computational complexity a...

Journal: :AJR. American journal of roentgenology 1988
G K Stimac B A Porter D O Olson R Gerlach M Genton

Unenhanced T1- and T2-weighted spin-echo, short inversion time inversion recovery (STIR), and gadolinium-DTPA (Gd-DTPA)-enhanced spin-echo and STIR imaging techniques were used in 20 patients as part of a multicenter study to assess the safety and efficacy of Gd-DTPA in spinal imaging. Five patients had normal MR scans. Of those with lesions, both Gd-DTPA-enhanced T1-weighted spin-echo and unen...

2006
Emanuël A. P. Habets Piet C.W. Sommen

Hands-free devices, such as mobile phones, are perhaps one of the most prominent applications of acoustic echo cancellation systems. They are often used in a noisy enclosed environment. Therefore, the recorded near-end speech will also contain reverberation and background noise, which degrade the fidelity and intelligibility of speech. In the last two decades postprocessors have been developed ...

2017
Rajender Kumar

With the development of technology the whole dimension of communication has changed. In modern day people are more interested in hand-free communication. So, the users use an ordinary loudspeaker and a microphone, at place of telephone receiver. Benefit of wireless communication is that it allows the users to have both hands free and to travel freely in the area. The truth of a huge audio mixtu...

Journal: :Journal of Low Temperature Physics 2022

Abstract The ECHo experiment aims at determining the effective electron neutrino mass by analyzing endpoint of 163 Ho capture spectrum. High energy resolution detectors with a well-tailored detector response are essential ingredient for success experiment. Metallic magnetic calorimeter arrays enclosing have been chosen first MMC array, ECHo-1k, showed excellent performances an average 5.5 eV FW...

Journal: :Artificial life 1997
Peter T. Hraber Terry Jones Stephanie Forrest

Echo is a generic ecosystem model in which evolving agents are situated in a resource-limited environment. The Echo model is described, and the behavior of Echo is evaluated on two well-studied measures of ecological diversity: relative species abundance and the species-area scaling relation. In simulation experiments, these measures are used to compare the behavior of Echo with that of a neutr...

Journal: :Optics letters 1998
B Luo U Elman S Kröll R Paschotta A Tropper

The efficiency of photon-echo processes typically lies in the 0.1-1% range. For many photon-echo-based applications suggested in optical storage and all-optical communication the photon-echo output pulses would need to be used as input data to a new photon-echo process. In such cases amplification of the photon-echo output signals would be necessary for an acceptable signal-to-noise ratio to be...

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