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    • 52. 发明授权
    • Echo canceler
    • 回波消除器
    • US06704415B1
    • 2004-03-09
    • US09354185
    • 1999-07-15
    • Hiroshi KatayamaYasushi YamazakiHitoshi MatsuzawaYoshihiro TomitaMutsumi SaitoHisanari Kimura
    • Hiroshi KatayamaYasushi YamazakiHitoshi MatsuzawaYoshihiro TomitaMutsumi SaitoHisanari Kimura
    • H04M100
    • H04M9/082
    • An echo canceler makes it possible to adaptably control a power of speech reception voice and to reduce distortion of a voice output from a speaker. The echo canceler has a basic structure includes a power control section controlling a power for a speech reception voice, a first filtering section removing a particular component from an output of the power control section, an echo canceling section removing echo components of a speech reception voice, which are added to a speech transmission voice, a second filtering section filtering particular components of the speech reception and transmission voices, and a state judgement section judging existences of the speech reception and transmission voices from an output of the second filtering section and controlling a power attenuation amount of the power control section based on the judgement result.
    • 回波消除器使得可以适应性地控制语音接收语音的功率并且减少来自扬声器的语音输出的失真。 回波消除器具有基本结构,包括控制语音接收语音的功率的功率控制部分,从功率控制部分的输出中去除特定分量的第一滤波部分,去除语音接收语音的回声分量的回声消除部分 ,其被添加到语音传输语音中,第二滤波部分滤除语音接收和传输语音的特定分量,以及状态判断部分,从第二滤波部分的输出判断语音接收和传输语音的存在,并且控制 功率控制部的功率衰减量基于判断结果。
    • 54. 发明授权
    • Piezoelectric resonator and method for fabricating the same
    • 压电谐振器及其制造方法
    • US06243933B1
    • 2001-06-12
    • US09303682
    • 1999-05-03
    • Masato SugimotoKatsu TakedaYoshihiro TomitaOsamu Kawasaki
    • Masato SugimotoKatsu TakedaYoshihiro TomitaOsamu Kawasaki
    • H04R1700
    • H03H9/177H03H3/04H03H9/02031H03H9/0207H03H9/176Y10T29/42Y10T29/49004
    • A wafer with a reversed domain is prepared for two piezoelectric single crystal plates and of about the same thickness by using direct bonding without any adhesive. Driving electrodes are formed on two principal planes of the wafer with a reversed domain to provide a piezoelectric resonator. A piezoelectric resonator having the structure with a reversed polarization and using odd-order vibration modes vibrating with a fundamental wave has a wavelength of a thickness thereof and suppresses scattering of the thickness of the domains with a reversed polarization. In the direct bonding, the axes of the spontaneous polarization of the two piezoelectric single crystal plates are reverse to each other and crystalline axes other than the axes of polarization are shifted intentionally by an angle other than zero. Thus, spurious modes are suppressed in a simple way.
    • 对于两个压电单晶板制备具有反向畴的晶片,并且通过直接接合而没有任何粘合剂制备大约相同的厚度。 在晶片的两个主平面上形成驱动电极,具有反向的畴,以提供压电谐振器。 具有反极化结构和使用基波振荡的奇数振动模式的压电谐振器具有其厚度的波长,并且抑制具有反向偏振的畴的厚度的散射。 在直接接合中,两个压电单晶板的自发极化的轴线彼此相反,并且除偏振轴之外的结晶轴有意地以不同于零的角度移动。 因此,以简单的方式抑制杂散模式。
    • 55. 发明授权
    • Displacement control actuator
    • 位移控制执行器
    • US5994821A
    • 1999-11-30
    • US978422
    • 1997-11-25
    • Katsumi ImadaTetsuro OtsuchiMasato SugimotoYoshihiro TomitaOsamu Kawasaki
    • Katsumi ImadaTetsuro OtsuchiMasato SugimotoYoshihiro TomitaOsamu Kawasaki
    • H01L41/09H01L41/04
    • H01L41/094
    • Rectangular piezoelectric substrates each of which has main surfaces opposed to each other, measures 50 .mu.m thick by 1 mm wide by 8 mm long, and is made of lithium niobate (LiNbO.sub.3), are directly bonded on the main surfaces so that their axes of polarization are set in directions reverse to each other, thereby composing a piezoelectric element. Electrodes which are 0.2 .mu.m thick and made of chromium-nickel are formed on the two main surfaces of the piezoelectric element opposed to each other, thereby resulting in a precision displacement control actuator of a bimorph type mechanical-electrical converter element. This configuration makes it possible to provide a compact precision displacement control actuator which has a large displacement and extremely small variations of characteristics such as displacement and resonance frequency.
    • 矩形压电基板各自具有彼此相对的主表面,其厚度为50μm厚×1mm×8mm长,由铌酸锂(LiNbO 3)构成,直接接合在主表面上,使得它们的轴线 极化被设置在彼此相反的方向上,从而构成压电元件。 在压电元件的两个主表面上形成厚度为0.2μm,由铬镍制成的电极,从而形成双压电晶片式机电转换元件的精密位移控制致动器。 这种构造使得可以提供一种紧凑的精确位移控制致动器,其具有大的位移和极小的位移和共振频率等特性的变化。