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:
Sep. 06, 1994
Filed:
May. 12, 1993
David Lipschutz, Lexington, MA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A delay interpolator for use in each channel of a digital ultrasound beamformer includes an FIR digital filter that is responsive to delay control information for delaying digital samples of the received beam by different delays that are quantized in increments less than the sampling period and a control unit for supplying the delay control information to the FIR digital filter. In a preferred embodiment, all but one of the filter coefficients are of the form 1/2.sup.m, where m is an integer, and multiplication is implemented in the FIR digital filter by shifting bits of the data samples by m bit positions. The FIR digital filter preferably includes a gain correction multiplier for correcting the gain of the delayed digital samples. The FIR digital filter delay interpolator can utilize a pipeline structure for high speed operation. In addition, the FIR digital filter delay interpolator can be used in a time multiplexed beamformer to process several beams simultaneously.