Beamformed ultrasonic imager with delta-sigma feedback control

Details Beamformed ultrasonic imager with delta-sigma feedback control Beamformed ultrasonic imager with delta-sigma feedback control

2006-01-17

2006-01-17

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S172000, C341S144000

Reexamination Certificate

active

06987474

ABSTRACT:
A method and apparatus are provided for reducing distortion in a dynamically delayed digital sample stream of an imaging system. The method includes the steps of delta-sigma modulating an input analog signal of the imaging system at a frequency above the Nyquist frequency of the input analog signal to generate a digital sample stream and changing a length of the sample stream to delay a portion of the sample stream while maintaining synchronism between a delta-sigma modulator and a demodulator of the system.

REFERENCES:
patent: 5565867 (1996-10-01), Tiemann
patent: 6208189 (2001-03-01), Freeman et al.
patent: 6252531 (2001-06-01), Gordon et al.
patent: 6366227 (2002-04-01), Rigby
patent: 6801148 (2004-10-01), Freeman et al.
patent: 6867720 (2005-03-01), Freeman et al.

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