发明名称 |
Beamformed ultrasonic imager with delta-sigma feedback control |
摘要 |
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. |
申请公布号 |
AU9684398(A) |
申请公布日期 |
1999.04.27 |
申请号 |
AU19980096843 |
申请日期 |
1998.10.06 |
申请人 |
Q-DOT. INC.;REGENTS OF THE UNIVERSITY OF MICHIGAN, THE |
发明人 |
STEVEN R. FREEMAN;MATTHEW O'DONNELL;THOMAS E LINNENBRINK;MARC A. MORIN;MARSHALL K. QUICK;CHARLES S. DESILETS |
分类号 |
A61B8/00;G01S7/52;H03M1/78;H03M3/02 |
主分类号 |
A61B8/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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