This paper is concerned with a method for generating pneumatic pulse trains of various types. The system consists of a rotary disk, two pneumatic sensors, a gear mechanism and an electronic circuit for driving the disk. The disk has fifty holes the centre of which are spaced equally round the circumference near the periphery of the disk. A column is mounted on each hole and a rectangular prism chip is attached on its upper surface. The column is adjusted to make the chip surface take a proper position using a spring and screw assembly, and also is set to rotate about the centre axis so that the long side of the chip can direct to either the centre of the disk (set “on”) or the direction perpendicular to it (set “off”). The pneumatic sensors are composed of a nozzle and an orifice. One of the nozzles is fixed on the base and the other is put on an arm rotatable about the turning axis of the disk, and they are arranged so as to face the outside part of the upper surface of the set “on” chips. The disk is rotated by a motor through a gear train with a speed proportional to an input voltage of an electronic circuit. When the chips set “on” pass through the nozzle counterfaces, pneumatic pulses generate in the pneumatic sensors, but the chips set “off” make the sensors generate no pneumatic pulse. Presetting the angular position of displaceable nozzle, two pneumatic outputs, one of which is lagging to the other in time, can be obtained from the pneumatic sensors by driving the disk. There are three basic pulse series generated by this device: (1) the pulse series of which the amplitude is proportional to a time function, (2) the pulse series of which the pulse interval is set at the standard length multiplied by an integer, and (3) the pulse series of which the pulse intervals are modulated by an electric signal. There are possibly combinations of the above three types.
