Real-time digital, synthetic-focus, acoustic imaging system
Patent 4325257 Issued on April 20, 1982. Estimated Expiration Date: 
February 20, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 20, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3891869 Electrically reprogrammable transversal filter using charge coupled devices Digital rectilinear ultrasonic imaging system Wear plate for piezoelectric ultrasonic transducer arrays Patent #: 4211949 InventorsApplicationNo. 06/122880 filed on 02/20/1980US Classes:73/626, Switched367/123, With phase shifter or delay means708/5, Correlation, convolution, or transformation73/632Sonic wave transmitter or receiver transducerExaminersPrimary: Kreitman, Stephen A.Attorney, Agent or FirmInternational ClassesG01S 15/00 (20060101)G01S 15/89 (20060101) G01S 7/52 (20060101) G10K 11/34 (20060101) G01N 29/26 (20060101) G10K 11/00 (20060101) AbstractThe invention involves a digital synthetic-focus, acoustic imaging system which is operative in real time and includes one or more electro-acoustic transducers arranged to receive broadband pulses from a pulse generator for excitation of acoustic pulses which are directed into the region under observation. Signals reflected from an object or discontinuity in the region are received by the same transducers, and after inverse filtering and nonlinear amplification are converted to digital signals. These digital signals are stored in separate high speed random access memory units for storage, but are subsequently time-equalized through use of a programmed focus memory unit prior to delivery to a digital adder and thence through a digital-to-analog converter for ultimate intensity modulation on a raster scanned display unit which provides the real time image.Other References
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