Beamformed ultrasonic imager with delta-sigma feedback control
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United States of America Patent
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Mar 15, 2005
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N/A
app pub date -
Aug 27, 2003
filing date -
Oct 6, 1997
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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.
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