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    • 3. 发明授权
    • Optical waveguide tube and method of making
    • 光波导管及其制作方法
    • US5684913A
    • 1997-11-04
    • US576337
    • 1995-12-21
    • Hideo SugiyamaMasato SugimachiMasato YoshikawaMinoru IshiharadaItsuo TanumaKazuo NaitoAtsushi Hotta
    • Hideo SugiyamaMasato SugimachiMasato YoshikawaMinoru IshiharadaItsuo TanumaKazuo NaitoAtsushi Hotta
    • G02B1/04G02B6/09
    • G02B6/02033G02B1/046
    • The invention relates to an optical waveguide tube comprising a tubular cladding filled with a solid core having a higher refractive index than the cladding. In one form, a resin material having a Tg of up to 50.degree. C. and a modulus of elasticity of up to 10.sup.9 dyne/cm.sup.2 is used as the core. In another form, a copolymer of acrylic acid, methacrylic acid or a lower alcohol ester thereof with a higher alkyl (meth)acrylate is used as the core, preferably in combination with a phosphate, aromatic carboxylate, aliphatic carboxylic acid, aliphatic carboxylate or glycol. In a third form, such an optical waveguide tube is prepared by filling a hollow tubular transparent cladding having opposite open ends with a liquid monomeric charge and causing the monomeric charge to polymerize while pressurizing the exposed surfaces of the monomeric charge inwardly from the opposite open ends along an axial direction of the cladding, thereby forming a core within the cladding.
    • 本发明涉及一种光波导管,其包括填充有具有比包层更高的折射率的实芯的管状包层。 在一种形式中,使用Tg高达50℃,弹性模量高达109达因/ cm2的树脂材料作为核心。 在另一种形式中,使用丙烯酸,甲基丙烯酸或其低级醇酯与高级(甲基)丙烯酸烷基酯的共聚物作为核心,优选与磷酸酯,芳族羧酸酯,脂族羧酸,脂族羧酸酯或二醇 。 在第三种形式中,这种光波导管通过用具有液体单体电荷填充具有相对开口端的中空管状透明包层来制备,并且使单体电荷聚合,同时将单体电荷的暴露表面从相对的开口端向内压 沿着包层的轴向方向,由此在包层内形成一个芯。
    • 5. 发明授权
    • Audio signal encoding apparatus
    • US06577252B2
    • 2003-06-10
    • US10040635
    • 2002-01-09
    • Atsushi Hotta
    • Atsushi Hotta
    • H03M700
    • G10L19/02
    • An audio signal encoding apparatus is provided which is capable of preventing deterioration in the objective characteristics of a signal to be encoded without using parameters from a psychoacoustic model generated based on human auditory characteristics or by replacing such parameters with those by which the signal can be effectively quantized in cases where the width of a frequency band in which frequency component such as a sine wave of the signal concerned exists is narrow. The audio signal encoding apparatus includes a psychoacoustic model section 1, an MDCT processing section 2 and an iterative loop processing section 3. The psychoacoustic model section 1 includes an FFT operation section 11, a block type determination section 12 and an SMR operation section 13. The iterative loop processing section 3 includes an allowable error amount calculation section 31, a bit amount/error amount control section 32, a normalization processing section 33, a quantization section 34 and a Huffman encoding section 35. The apparatus further includes a multiplexer section 4 for multiplexing a processing block type from the block type determination section 12, a scale factor from the bit amount/error amount control section 32, a Huffman code book number and a Huffman code from the Huffman encoding section 35, a sine wave discrimination section 14a for discriminating whether or not the input signal is a sine wave, by using the FFT frequency spectrum calculated by the FFT operation section 11, and a switching element 15, 16 for switching between use and nonuse of an output value of the SMR operation section 13 based on the result of sine wave discrimination in the sine wave discrimination section 14a.