A low cost method for detecting echo path variation is proposed. A detection parameter is constructed by averaging the coherence function between the synthetic echo and the error signal over time and frequency. The detection delay caused by the time averaging is accounted for by setting different

. This form of contrast is not observed in spin-echo images. Through simulations (9), we have shown that vessels as small as 50 ,um in diameter can be detected in images with a pixel size of 100 pum. We have also demonstrated that the size of the susceptibility-induced local field depends on (i

the frequency of the detected signal usually the Fourier transform is used. In this article we apply the new analysis tool, the wavelet transform, to the echo signal. In an example these two types of signal analyses tools are compared on the basis of measurements on a stairs like specimen. ZUSAMMENFASSUNG Die

Detection, location, and severity assessment of left anterior descending coronary artery stenoses by means of contrast-enhanced transthoracic

in their infancy. The “hook echo ” (Bigler 1956) was yet to be discovered. The initial Weather Bureau tornado warnings were issued on a countywide basis, in part, because our knowledge was so lacking it was not possible to isolate the portions of the thunderstorm where a tornado was likely to occur. There has been

�Abstract — An innovative approach to the generation of reverberation time series and echo detection algorithms is presented The time series approach utilizes recent developments in linear spectral prediction research in which the spectra of stochastic process are modelled as rational functions

Acoustic remote sensing is a useful tool for seafloor characterization. Echo sounder indicates the type of sediment on the seafloor through analysis of the returned echo's shape and energy characteristics. This paper analyze the echosounder ping returns for simple shape and energy statistics

coding artifacts which are associated with trans-form coding. The pre-echo is one such artifact. Pre-echoes typically occur when a sharp attack is preceded by silence. This thesis examines the factors which contribute to a pre-echo, and discusses the method of pre-echo detection and reduction implemented

-in the form of delayed overlapping echos in noisehas to be processed to yield information on the nature and location of scatterers. The method presented also solves more general problems of would also have to deal with a random phase component multiplying the gains mi, and the known shape of the probing pulse

This paper describes the aspects of the Echo design that are related to providing high availability. These aspects include the provision of redundant components (replicated disks and backup servers), the replication of information, and recovery from failures. Further, we discuss some less obvious