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    • 8. 发明授权
    • Signal detector circuit
    • 信号检测电路
    • US4399463A
    • 1983-08-16
    • US315455
    • 1981-10-27
    • Kazumi KawashimaMasaaki Fujita
    • Kazumi KawashimaMasaaki Fujita
    • H03J7/18H03J7/28H04N5/44H04N5/50
    • H03J7/18H03J7/28
    • A circuit for detecting the presence or absence of a television receiving signal is disclosed, wherein a detection output for automatic frequency control is compared with first to fifth levels. A low-level output is produced when the detection output is lower than the fifth level; an intermediate-level output is produced when the detection output is between the fifth and fourth levels; a low-level output is produced when the detection output is between the third and second levels; an intermediate-level output is produced when the detection output is between the second and first levels; and a high-level output is produced when the detection output is higher than the first level, thus producing an output signal of three-digit level from a single output terminal.
    • 公开了一种用于检测电视接收信号的存在或不存在的电路,其中用于自动频率控制的检测输出与第一至第五电平进行比较。 当检测输出低于第五级时,产生低电平输出; 当检测输出在第五级和第四级之间时产生中间级输出; 当检测输出在第三级和第二级之间时,产生低电平输出; 当检测输出在第二级和第一级之间时产生中间级输出; 并且当检测输出高于第一电平时产生高电平输出,从而从单个输出端产生三位数电平的输出信号。
    • 9. 发明申请
    • METHOD OF DETERMINING POSITION WHERE WORK IS DONE IN SPACE SURROUNDED BY SURFACES AND WORK RESULT MANAGEMENT DEVICE
    • 通过表面和工作结果管理设备确定空间位置的方法
    • US20110170374A1
    • 2011-07-14
    • US12866369
    • 2009-09-04
    • Masakazu MiyachiTetsuya YamadaSatoshi TasakiMasaaki FujitaKeiji IdaNaoki Suganuma
    • Masakazu MiyachiTetsuya YamadaSatoshi TasakiMasaaki FujitaKeiji IdaNaoki Suganuma
    • G01S3/80
    • G01S11/16G01S5/30
    • To provide a position determining method and a work result management device, used for internal inspection of a space surrounded by surfaces such as a boiler furnace, and further used for inspection of an inner or outer wall in a vessel and capable of detecting plural positions. There is provided a method of determining a position where work is done in a space surrounded by surfaces, wherein the position where work inside the space is done is a sidewall, wave receivers capable of receiving an acoustic wave signal are placed at three or more points, which are on the same plane substantially parallel to the sidewall but not collinear with one another and whose position coordinates are known, the signal is transmitted from a wave transmitter capable of transmitting an acoustic wave and placed at a position where work is done on the sidewall in the space, and the respective arrival times of the signal at the three or more wave receivers that are not collinear with one another are measured to determine the position coordinates of the wave transmitter using the arrival times and the position coordinates of the three or more wave receivers.
    • 提供一种位置确定方法和作业结果管理装置,用于内部检查由诸如锅炉炉的表面包围的空间,并且还用于检查容器中的内壁或外壁并且能够检测多个位置。 提供了一种确定在由表面包围的空间中完成工作的位置的方法,其中完成空间内的工作的位置是侧壁,能够接收声波信号的波接收器被放置在三个或更多点 它们在基本上平行于侧壁的同一平面上,但彼此不共线并且其位置坐标是已知的,该信号从能够发送声波的波发射器发射并放置在工作在 测量空间中的侧壁,并且测量在三个或更多个波形接收器处彼此不共线的信号的相应到达时间,以使用到达时间和位置坐标来确定波发射器的位置坐标, 更多的波接收机。