Diasonics, Inc.

John J Lum

Steven F Forestieri

John L Schultz

Sheng T Lin

Steven A McNerney

William A Rains

An apparatus and method for displaying ultrasonic data in real time reflected in a living organism. The apparatus comprises a plurality of analog-to-digital converters for digitizing reflected Doppler signals produced by reflecting a reference pulsed acoustic signal, each of the analog-to-digital converters capable of producing a plurality of digitized Doppler signals. The apparatus futher comprises a plurality of digital signal processors, each of the plurality of digital signal processors coupled to each of the plurality of analog-to-digital converters for processing digitized Doppler signals received from the analog-to-digital converters, each of the digital signal processors capable of producing a plurality of processed digital signals. The apparatus further comprises a controller coupled to the analog-to-digital converters and the digital signal processors for controlling the operation of the analog-to-digital converters and digital signal processors, controlling the receipt of the processed digital signals, and compressing each of the plurality of processed digital signals output from the plurality of digital signal processors into a plurality of signals suitable for display.

Apparatus for processing and displaying ultrasonic data

As disclosed herein, a new and improved method and apparatus provide for fine tuning the position of a servomotor used to drive a transducer mounted on an ultrasound probe to a desired position. This improvement is accomplished by processing the analog quadrature output signals of an incremental optical encoder, coupled to the servomotor. The improvement uses the positional information derived from the analog quadrature output signals. The analog quadrature output signals, defined as sine and cosine, are converted to digital square waves. The digital square waves are decoded to produce digital position quadrants, wherein each quadrant represents a specific motor position. The corresponding digital square waves are also decoded by a logic array device and coupled to the select input of an analog switch. The analog quadrature output signals are also coupled to an analog device that converts the output signals to four phase shifted sinusoidal wave forms, having a linear portion within a digital position quadrant. The select signals from the logic array device select one of the four phase shifted wave forms. The output of the analog switch is then compared to a reference signal. The resulting output from the comparison is an analog error signal. This analog error signal forces the motor towards the zero crossing within a digital position quadrant.

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San Francisco, CA, United States of America

John J Lum