Beamformed ultrasonic imager with delta-sigma feedback control
First Claim
Patent Images
1. A method of reducing distortion in a dynamically delayed digital sample stream of an imaging system, such method comprising 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 while maintaining synchronism between a delta-sigma modulator and a demodulator of the system, thereby reducing intermodulation corruptions.
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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.
69 Citations
31 Claims
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1. A method of reducing distortion in a dynamically delayed digital sample stream of an imaging system, such method comprising the steps of:
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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 while maintaining synchronism between a delta-sigma modulator and a demodulator of the system, thereby reducing intermodulation corruptions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Apparatus for reducing distortion in a dynamically delayed digital sample stream of an imaging system, such apparatus comprising:
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means for 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 the digital sample stream; and means for changing a length of the sample stream while maintaining synchronism between the means for delta-sigma modulating and a demodulator of the system, thereby reducing intermodulation corruptions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Apparatus for reducing distortion in a dynamically delayed digital sample stream of an imaging system, such apparatus comprising:
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a delta-sigma modulator which modulates an input analog signal of the imaging system at a frequency above the Nyquist frequency of the input analog signal to generate the digital sample stream; and a sample stream controller which changes a length of the sample stream to delay a portion of the sample stream while maintaining synchronism between the means for delta-sigma modulating and a demodulator of the system. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification