| 摘要 |
PURPOSE:To apply the vibrations having the difference in phases to a plurality of points in a structure concurrently by operating a plurality of vibrations with two or more signals having the difference in phases. CONSTITUTION:A clock signal 10 generated in a pulse generator 3 is measured by a reference counter 4a and slave counters 4b-4e. The reference counter 4a is an no notation counter and generates a synchronizing pulse 11 when the counting to no has been completed. Based on said synchronizing pulses, the slave counter 4b-4e which are the same n notation counter performs the counting from numerical value n1-n4 which are set by digital switches 9b-9e. The counted output of the reference counter 4a corresponds to time {ti} and constitutes a sequence {ai}, and the outputs of the slave counters constitute the sequences {bi}-{ei}. At a time tj, the components of said sequences aj-ej specify the address of the memory 5a-5e. The memory 5a-5e outputs the digital data corresponding to the specified addresses. The outputs are converted into analog signals 12a-12e by D/A converter 6a-6e, amplified by amplifiers 7a-7e and excite the vibrators 8a-8e. |
