The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 02, 2002
Filed:
Mar. 28, 2000
Kenneth Wayne Rigby, Clifton Park, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Techniques for minimizing artifacts resulting from ultrasound time-delay focusing while using a single-bit delta-sigma analog-to-digital converter for each beamformer channel include correcting the dynamic focus artifact in a delta-sigma beamformer by always inserting a pair of samples having a zero sum when a delay is required. Using other techniques, the dynamic focus artifact is not eliminated on each beamforming channel, but rather is eliminated in the beamsummed, reconstructed signal. In one technique, samples having a zero sum are respectively inserted on a pair of symmetric channels such that the net effect on the beamsummed signal is zero. In another technique, a +1 sample is inserted when a focus time delay is required, and either a pre-calculated or counted number of channels having a focus time delay at each time sample is subtracted from the beamsum.