To provide an ultrasonic diagnostic apparatus that performs a phasing addition process being more accurate than a conventional one by performing an accurate phase process.
The ultrasonic diagnostic apparatus includes: a memory 7; a delay control part 12; a data register 13; an APF part 14; and a data register 15. The delay control part 12 calculates an all-pass filter coefficient based on a value below the decimal point of theoretical delay amount and performs a reading start address calculation and a focus position address calculation from the memory 7 based on an integer value of the theoretical delay amount. The control part stores data in the reading start address on the memory 7 in the data register 13, performs an all-pass filter process of the data in the data register 13, in which a delay process below the decimal point is executed by the APF part, stores the data in the data register 15 and outputs delay data from the focus position address of the data register 15.
| JPS63222745A | 1988-09-16 | |||
| JPH10293170A | 1998-11-04 |
Daisuke Nagano
Kentaro Fujii