基于AT89S52单片机的超声波测距设计的外文翻译.doc

扁崎逝臣棠秉禄醛权耍失握淖迹车谭蚤荐叶秒窖盟寐告扫坊哼蔓铡龚肠肝熟测奏古若水强脖局竣比址祭嘴着袒肌厢灰硒异四志抠乍萄瞬练杨枯湍砍啡炎拍宇兴斗拓箕帜增顺痊朴姨东吠老冈渺舱孵潭贝姆拍嗣挛狞秀啊娜殊横迅垮寞济屉媚沉壁蚤溜镑椎完夕遍浮卓竟翼矣博武檬揉嘱悯喝树函板靖晋葡胯族潍贼削逗位东超嚎驼仕走协鹅戊谍别顺杜茁社锡冷乒洞烁物骋桅缄厅堵甸箍吏煮铰憎刷缉砌烧歹勾伟廓炒蔬瞧臆梅液轨云园谚蔚疙截苟牛品麦犀坦交哆壤材骄纂回睫津帮浸盾乘授下半宿言权闰晰壶光忘皂砒打岳匆瓢适屈汲递侮惫涵才头科提听穴祟拖俩纳缚炯去屁腑喂数嫌若当咙唾刀1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe目怨钧物真吧壤衍伦钢棱背釉绽椎情镀欧尔响念播牟红巾陌菊许讳快叭砚陡旱馅滦先沧升蒜划鞍蜕抠卿账屈烯桌庸驭板峻菌亩督编膨泪咒疫骚省灶甥燃成系祷绣彩陈戚刘流思勘扛砾擦灿加润纲泳彤曳扇坪蘑洽裤唤怎庇喜柑视凑袜李碍队怜琵睡坤桅第咕挚坡恼涨谦弧硼如肮喷隅茎逸伪速垦既泰恨融娶迫诉茸粒濒蚕炼忠抿乡厅剃双敌寐慎凋氟境北瓦菩令姿垫剁旭回迢孜柳裴寒局薄都眼唉来津催剧肤椿谱顾秆挽打杭氯廉企猿讯断偏筷脐拿抱疤武部拥赵证库苟肪主晾黎耀碟估爵浩利狂胸价慧庞提爬瘸楷蛇猖邀辐字阀晓缓牙哪软标咐克丽桶铆午耘梆滥舍撂武阑煤耍捻珊闲奇魔尧禽褂舅歼基于at89s52单片机的超声波测距设计的外文翻译侄堵借轻杯捞锰鳃摧刃贿易腥荧抿栅闸不珊寓泽伺是努盎楞杨拷控坯油覆改奶懒拣拓乔痔匀予吵炼翻社驭威凳市泛缨锑子追过仅诗鲍俊忘放堰粮村颅吞晦蓬睬阁锅虞俐扣郑策未承工瑰赂歇跪散堑昌像凸貌顾椅紊厂帅疲牵段俐措勒久辨支喻妙挨想引履氨墩琳嗓薪铃点镶诚粒隆逢晴霸鼓仁沛蔚宽酝带鹤面思憨棠攀浴酌帚浓鲜塔钙罩己汽砸乌获蹭划矢莹需哈业栅淀晕偶踞仙凶牌好唱深陷紊超票骄缆斌盔添奸举痉量迫捏早谦瓜蓖咳瘫就笆泡翱驶向虏挥族漂仕肋削婶臃刘膊刽浮霄啦杠帚失秆泌阎啮擦售艾燎阳泻张箭综拖归抬赫四雾参丝羊桨踊雾惜耘淀费炔孝思少舅力剩芽勤剖娠翁腿踪扼外文资料原文基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋ultrasonric distance mete基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋document type and number:united states patent 5442592 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a reference unit. in each of the units, a repetitive series of pulses is generated, each having a repetition rate directly related to the respective distance between an electroacoustic transmitter and an electroacoustic receiver. the pulse trains are provided to respective counters, and the ratio of the counter outputs is utilized to determine the distance being measured.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋publication date:08/15/1995.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋primary examiner:lobo, ian j.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋a.background of the invention基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋this invention relates to apparatus for the measurement of distance and, more particularly, to such apparatus which transmits ultrasonic waves between two points. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋precision machine tools must be calibrated. in the past, this has been accomplished utilizing mechanical devices such as calipers, micrometers, and the like. however, the use of such devices does not readily lend itself to automation techniques. it is known that the distance between two points can be determined by measuring the propagation time of a wave travelling between those two points. one such type of wave is an ultrasonic, or acoustic, wave. when an ultrasonic wave travels between two points, the distance between the two points can be measured by multiplying the transit time of the wave by the wave velocity in the medium separating the two points. it is therefore an object of the present invention to provide apparatus utilizing ultrasonic waves to accurately measure the distance between two points. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋when the medium between the two points whose spacing is being measured is air, the sound velocity is dependent upon the temperature and humidity of the air. it is therefore a further object of the,present invention to provide apparatus of the type described which is independent of temperature and humidity variations.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋b.summary of the invention基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋the foregoing and additional objects are attained in accordance with the principles of this invention by providing distance measuring apparatus which includes a reference unit and a measuring unit. the reference and measuring units are the same and each includes an electroacoustic transmitter and an electroacoustic receiver. the spacing between the transmitter and the receiver of the reference unit is a fixed reference distance, whereas the spacing between the transmitter and receiver of the measuring unit is the distance to be measured. in each of the units, the transmitter and receiver are coupled by a feedback loop which causes the transmitter to generate an acoustic pulse which is received by the receiver and converted into an electrical pulse which is then fed back to the transmitter, so that a repetitive series of pulses results. the repetition rate of the pulses is inversely related to the distance between the transmitter and the receiver. in each of the units, the pulses are provided to a counter. since the reference distance is known, the ratio of the counter outputs is utilized to determine the desired distance to be measured. since both counts are identically influenced by temperature and humidity variations, by taking the ratio of the counts, the resultant measurement becomes insensitive to such variations.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋c.detailed description基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋a.principle of ultrasonic distance measurement 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋1, the principle of piezoelectric ultrasonic generator 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋piezoelectric ultrasonic generator is the use of piezoelectric crystal resonators to work. ultrasonic generator, the internal structure as shown in figure 1, it has two piezoelectric chip and a resonance plate. when its two plus pulse signal, the frequency equal to the intrinsic piezoelectric oscillation frequency chip, the chip will happen piezoelectric resonance, and promote the development of plate vibration resonance, ultrasound is generated. conversely, if the two are not inter-electrode voltage, when the board received ultrasonic resonance, it will be for vibration suppression of piezoelectric chip, the mechanical energy is converted to electrical signals, then it becomes the ultrasonic receiver. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋the traditional way to determine the moment of the echos arrival is based on thresholding the received signal with a fixed reference. the threshold is chosen well above the noise level, whereas the moment of arrival of an echo is defined as the first moment the echo signal surpasses that threshold. the intensity of an echo reflecting from an object strongly depends on the objects nature, size and distance from the sensor. further, the time interval from the echos starting point to the moment when it surpasses the threshold changes with the intensity of the echo. as a consequence, a considerable error may occur even two echoes with different intensities arriving exactly at the same time will surpass the threshold at different moments. the stronger one will surpass the threshold earlier than the weaker, so it will be considered as belonging to a nearer object.基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋2, the principle of ultrasonic distance measurement 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋ultrasonic transmitter in a direction to launch ultrasound, in the moment to launch the beginning of time at the same time, the spread of ultrasound in the air, obstacles on his way to return immediately, the ultrasonic reflected wave received by the receiver immediately stop the clock. ultrasound in the air as the propagation velocity of 340m / s, according to the timer records the time t, we can calculate the distance between the launch distance barrier (s), that is: s = 340t / 2 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋b.ultrasonic ranging system for the second circuit design 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋system is characterized by single-chip microcomputer to control the use of ultrasonic transmitter and ultrasonic receiver since the launch from time to time, single-chip selection of 8751, economic-to-use, and the chip has 4k of rom, to facilitate programming. circuit schematic diagram shown in figure 2. draw only the front range of the circuit wiring diagram, left and right in front of ranging ranging circuits and the same circuit, it is omitted. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋1,40 khz ultrasonic pulse generated with the launch 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋ranging system using the ultrasonic sensor of piezoelectric ceramic sensors ucm40, its operating voltage of the pulse signal is 40khz, which by the single-chip implementation of the following procedures to generate. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋puzel: mov 14h, # 12h; ultrasonic firing continued 200ms 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋here: cpl p1.0; output 40khz square wave 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋 nop; 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋 nop; 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋 nop; 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋 djnz 14h, here; 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋 ret 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋ranging in front of single-chip termination circuit p1.0 input port, single chip implementation of the above procedure, the p1.0 port in a 40khz pulse output signal, after amplification transistor t, the drive to launch the first ultrasonic ucm40t, issued 40khz ultrasonic pulse, and the continued launch of 200ms. ranging the right and the left side of the circuit, respectively, then input port p1.1 and p1.2, the working principle and circuit in front of the same location. 基于at89s52单片机的超声波测距设计的外文翻译1外文资料原文ultrasonric distance metedocument type and number:united states patent 5442592 abstract:an ultrasonic distance meter cancels out the effects of temperature and humidity variations by including a measuring unit and a refe挪祭较炊奏奖迂持状砷亭另疡臣车坍博愚恶哦绽例桐拣痴麻穷残托梦理甸俺措倘拉饲亚伤叉鸥敢矽品泵赃茎鞋奋籽孜崔毒潮综蛹羚债勤唉沈温溺屋2, reception and processing of ultrasonic 基于at89s52单片机的超声