Medical direct digital radiography takes radiographs by using special computerized radiography equipment and converts the acquired radiographic image information into digital data which are then reproduced either on the screen or printed into hardcopies.

This paper introduces a direct analog-to-digital conversion technique for high accuracy weighscale, aiming at the problem that traditional analog-to-digital conversion weighscale has poor performance in long-distance signal transfer and limited capacity for cells.

A direct analog-to-digital conversion technique is introduced here aiming at the problem that traditional analog-to-digital conversion weighscale has poor performance in long-distance signal transfer and limited capacity for cells.

AIM: To compare the performance of two exciting sources based on direct digital synthesis (DDS) technology and to present some advice for the future system design.

This paper is to design a current-mode multi-frequency impedance exciting source which adopts direct digital synthesis technology.

Through analysis on the working principle of direct digital synthesis (DDS) technique,combined with actual DDS chip AD9850,detailed introduction to including FM,FSK,PSK etc multi-digital modulation methods realization was made.

Some techniques deserving consideration in purchase of direct digital photography machines in children's hospital are discussed as reference for doctors who purchase machines and decision-makers in hospital.