Echo detection

Details Echo detection Echo detection

2008-02-26

2010-02-02

Lobo, Ian J (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

C367S099000

Reexamination Certificate

active

07656750

ABSTRACT:
An echo detection circuit that detects an echo by detecting the magnitude of a digitally mixed representation of the received acoustic signal and reference sine and cosine signals. That magnitude is then compared against an echo threshold to verify the presence or absence of an echo signal. A low pass filter with a configurable cut-off frequency may be used to define the selectivity of the echo detector.

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patent: 5379770 (1995-01-01), Van Veen
patent: 2001/0012238 (2001-08-01), Iwasaki et al.
Echo detection using quadrature zero IF mixer (11 pages).
A Mixed-Signal BiCMOS Front-End Signal (10 pages) Processor for High-Temperature Applications IEEE Journal of Solid-State Circuits, vol. 41, No. 7, Jul. 2006 Ovidiu Vermesan, Member, IEEE, Lars-Cyril Julin Blystad, Member, IEEE, Roy Bahr, Magnus Hjelstuen, Lionel Beneteau, Member, IEEE, and Benoit Froelich, Member, IEEE.

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