Communications – electrical: acoustic wave systems and devices – Acoustic image conversion
Patent
1994-09-07
1996-01-30
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Acoustic image conversion
367 11, 367103, 12866101, G03B 4206
Patent
active
054885884
ABSTRACT:
An ultrasonic imaging system provides dynamic focusing by using dynamic group delay in addition to dynamic phase focus. FIFO memory storage capacity in the beamforming circuit is increased to provide improved resolution of the data samples stored therein. These samples are selected by an address counter in response to both the advance of time and the accumulation of a phase advance clock count. After a Read Start signal, indicating the start of a beam, is supplied to the FIFO memory, the FIFO memory address is advanced, on each read instruction, by the number of address locations corresponding to the period of a pipeline channel. In addition, the address is incremented whenever the accumulated count of a phase advance clock exceeds an amount corresponding to the smallest increment of the data stored in the FIFO memory.
REFERENCES:
patent: 4974211 (1990-11-01), Corl
patent: 5111695 (1992-05-01), Engeler et al.
patent: 5172343 (1992-12-01), O'Donnell
patent: 5228006 (1993-07-01), Sheriff
patent: 5228007 (1993-07-01), Murakami et al.
Daft Christopher M. W.
Engeler William E.
Eldred J. Woodrow
General Electric Company
Snyder Marvin
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