fxck专利名称：SOUND IMAGING APPARATUS 发明人：KOJIMA HIROSHI
关于低碳生活的英语作文申请号：JP6309886
expanding
tomb sweeping day>online marketing申请日：19860320
国防科技大学2020录取分数线公开号：JPS62218885A
proud的名词公开日：
报效祖国演讲稿
19870926
专利内容由知识产权出版社提供
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摘要：PURPOSE:To perform the three-dimensional detection on a matter by one transmission, by transmitting a transmitting signal of variable frequency by a two-system transmitting element and analyzing frequency in a receiving side to detect a pha. CONSTITUTION:Tone burst changing in this frequency with the elap of time is generated in the transmitting control part 11 of a transmitter 1 and an acoustic signal is delayed by the time corresponding to a specific pha with respect to the time and each frequency component corresponding to the specific pha to center frequency by respective delay circuits 12, 13 to be transmitted into water from two system transmitting elements 21, 22 of a transmitter 2 spaced apart from each other by a definite distance and sweeping is performed between azimuth angles in a predetermined range. The reflected wave from matter is received by the respective receiving elements 31, 32 of a receiver 3 and the receiving signal passing through an A/D converter 5 is analyzed by a frequency analyr 6 to supply the analytical result to a pha detector 7 as a transmitting azimuth signal. Whereupon, the detector 7 compares the phas of both receiving signals at every specific frequency spectrum to calculate a receiving azimuth to display the same on a display device 9. By this method, three-dimensional information is obtained by transmitting and receiving waves of one time to be displayed
within a short time.
demo是什么意思
申请人：NEC CORP
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