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    • 92. 发明授权
    • Squelch circuit
    • 静噪电路
    • US4172996A
    • 1979-10-30
    • US879405
    • 1978-02-21
    • Tadatsugu TokunagaAkira Fujii
    • Tadatsugu TokunagaAkira Fujii
    • H03G3/34H04B1/10
    • H03G3/341
    • A squelch circuit for use in an angle-modulation communication receiver includes a squelch switch responsive to a control signal generated by a squelch control circuit. The squelch control circuit has a level detector for detecting a carrier level of a received signal and a decision circuit which detects the presence of impulse noise in the received signal. The output of the decision circuit is supplied to a counter for counting the number of impulse noise occurrences in a predetermined time period. The logical product of the outputs of the level detector and the counter is formed to generate the control signal for the squelch switch.
    • 用于角度调制通信接收机的静噪电路包括响应于由静噪控制电路产生的控制信号的静噪开关。 静噪控制电路具有用于检测接收信号的载波电平的电平检测器和检测接收信号中是否存在脉冲噪声的判定电路。 判定电路的输出被提供给用于对预定时间段内的脉冲噪声发生次数进行计数的计数器。 形成电平检测器和计数器的输出的逻辑积,以产生静噪开关的控制信号。
    • 96. 发明授权
    • Voice analyzer and voice analysis system
    • 语音分析仪和语音分析系统
    • US09129611B2
    • 2015-09-08
    • US13465230
    • 2012-05-07
    • Yohei NishinoHaruo HaradaKei ShimotaniHirohito YoneyamaKiyoshi IidaAkira Fujii
    • Yohei NishinoHaruo HaradaKei ShimotaniHirohito YoneyamaKiyoshi IidaAkira Fujii
    • G10L25/51G10L17/00
    • G10L25/51G10L17/00
    • A voice analyzer includes a first voice acquisition unit provided in a place where a distance of a sound wave propagation path from a mouth of a user is a first distance, plural second voice acquisition units provided in places where distances of sound wave propagation paths from the mouth of the user are smaller than the first distance, and an identification unit that identifies whether the voices acquired by the first and second voice acquisition units are voices of the user or voices of others excluding the user on the basis of a result of comparison between first sound pressure of a voice signal of the voice acquired by the first voice acquisition unit and second sound pressure calculated from sound pressure of a voice signal of the voice acquired by each of the plural second voice acquisition units.
    • 语音分析器包括:第一语音获取单元,设置在来自用户的口部的声波传播路径的距离为第一距离的位置,多个第二语音获取单元,设置在距离用户的声波传播路径的距离 用户的口径小于第一距离,以及识别单元,其基于第一和第二语音获取单元获取的语音是否基于用户的语音或除了用户之外的其他人的语音,基于 由第一语音获取单元获取的语音的语音信号的第一声压和由多个第二语音获取单元中的每一个获取的语音的语音信号的声压计算的第二声压。
    • 97. 发明授权
    • Radio positioning and ranging system and positioning and ranging program
    • 无线电定位和测距系统及定位及测距方案
    • US08823588B2
    • 2014-09-02
    • US12795101
    • 2010-06-07
    • Masafumi AsaiHidenori SekiguchiAkira Fujii
    • Masafumi AsaiHidenori SekiguchiAkira Fujii
    • G01S11/08G01S1/24G01S5/14G01S5/02G01S11/06G01S5/06
    • G01S11/06G01S5/0221G01S5/06G01S5/14G01S11/08
    • A positioning and ranging system includes a transmitter transmits a plurality of impulses; and a receiver receives the impulses; the receiver includes an initial detection unit records a sensing time of a first impulse among a plurality of impulses transmitted by the transmitter; a sensing margin detection unit for detecting a sensing margin being a difference between a field intensity of the first impulse and a reception limit field intensity of the receiver; a correction unit identifies a sensing error differential time based on a given relationship between the sensing margin and the sensing error differential time, and corrects the sensing time detected by the initial detection unit using the identified sensing error differential time; the system measures a distance between the transmitter and the receiver and a position of the transmitter based on a time the transmitter transmits the first impulse and a time the receiver receives the impulse.
    • 定位和测距系统包括发射机发射多个脉冲; 接收器接收脉冲; 所述接收机包括初始检测单元,记录由所述发送器发送的多个脉冲中的第一脉冲的感测时间; 感测余量检测单元,用于检测作为第一脉冲的场强与接收机的接收极限场强之间的差的感测余量; 校正单元基于感测余量和感测误差差分时间之间的给定关系来识别感测误差差分时间,并且使用所识别的感测误差差分时间校正由初始检测单元检测到的感测时间; 该系统基于发射机发射第一脉冲的时间和接收机接收脉冲的时间来测量发射机和接收机之间的距离以及发射机的位置。