Each array was characterized in terms of impedance measurements, pulse-echo response, and experimental beamprofile.
"It's not required information," said Mr. Davis of Exxon, echoing responses from Chevron, Royal Dutch/Shell and other big producers.
The researchers then characterized the echo response time and frequency of the resulting sound reflection patterns, which varied according to the number and size of the branches and leaves on each plant.
He pioneered techniques such as the ambush interview, confrontations with suspected malefactors, hidden cameras, and the echo response, repeating a particularly telling phrase from the interviewee – although this became tiresome in the mouths of lesser broadcasters.
The liver was graded for markers of hepatic steatosis using established criteria (13– 15) including a bright hepatic echo pattern (compared with the echo response of the right kidney), increased attenuation of the echo beam, and the presence of focal fatty sparing.
Also, in the echo-cancellation-based DMT system, the TEQ can be used to jointly shorten the echo response thus reducing the complexity of the echo canceler.
This paper begins by providing a review of techniques that aim to give improved echo cancellation performance when the echo response is sparse.
In some cases the echo response that must be identified by the echo canceller is sparse, as for example when telephony traffic is routed over networks with unknown delay such as packet-switched networks.
In small scale studies (where the effect of depth-wise attenuation is effectively ignored), a peak is measured in the strength of the echo responses at intermediate concentrations, due to a balance of the backscatter and attenuation components on the overall signal.
Her bereavement echo responses to death seen in other species.
