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    • 1. 发明授权
    • Digital speech interpolation system and speech detector
    • 数字语音插值系统和语音检测器
    • US4897832A
    • 1990-01-30
    • US297668
    • 1989-01-17
    • Takao SuzukiYuichi ShirakiOsamu NoguchiYasuo Shoji
    • Takao SuzukiYuichi ShirakiOsamu NoguchiYasuo Shoji
    • H04B3/23H04J3/17
    • H04J3/175H04B3/23H04J3/172H04B3/234
    • A digital speech interpolation (DSI) system serves multiple PCM channels by multiplexing them to a single PCM signal, detecting the presence of speech on individual channels according to an adaptive power threshold, removing silent portions of the channel signals, and recombining them into a signal with fewer channels. A central echo canceler is provided between the DSI transmitter and the multiplexer, thus eliminating the need for a separate echo protection device at each terminal. The central echo canceler provides information to the speech detector enabling the speech dectector to avoid updating the adaptive power threshold when center clipping or double-talk occurs, thus preventing erratic speech detection performance. The speech detector also has a hangover controller that prevents speech dropouts by prolonging speech dectect intervals by an amount that is adjusted according to the length of the interval, and according to the current adaptive power threshold; this form of control enables a constant activity ratio to be maintained under varying noise levels. Benefits include improved communication quality and reduced system cost.
    • 数字语音插值(DSI)系统通过将多路复用到单个PCM信号来服务于多个PCM信道,根据自适应功率阈值检测单个信道上的语音的存在,消除信道信号的无声部分,并将其重新组合成信号 渠道较少 在DSI发射机和多路复用器之间提供中央回波消除器,从而消除了在每个终端处需要单独的回波保护装置。 中央回波消除器向语音检测器提供信息,使得语音检测器能够在发生中心限幅或双向通话时避免更新自适应功率阈值,从而防止不规律的语音检测性能。 语音检测器还具有宿醉控制器,其通过根据间隔的长度以及根据当前的自适应功率阈值延长语音检测间隔的量来防止语音丢失; 这种形式的控制使得能够在变化的噪声水平下保持恒定的活动比。 优点包括提高通信质量和降低系统成本。
    • 2. 发明授权
    • Delta sigma modulator circuit for an analog-to-digital converter
    • 用于模数转换器的ΔΣ调制器电路
    • US4772871A
    • 1988-09-20
    • US46783
    • 1987-05-07
    • Takao SuzukiYasuo ShojiYuichi Shiraki
    • Takao SuzukiYasuo ShojiYuichi Shiraki
    • H03M3/04H03M3/02H03M1/00
    • H03M3/42
    • In a delta-sigma modulator for an A/D converter for modulating an analog input signal to produce a modulated signal of a digital form, a first integrator produces a first integral signal indicative of an integral of the difference between the analog input signal and feedback signal, a first delay element delays the first integral signal by one sampling period, a second integrator produces a second integral signal indicative of an integral of the difference between the output of the first delay element and the feedback signal, a first quantizer produces a two-level signal "1" or "0" depending on whether or not the second integral signal is greater than a predetermined reference, and a second quantizer produces a two-level signal "1" or "0" depending on whether or not the first integral signal is greater than a predetermined reference. An output digital signal is produced in accordance with the outputs of the first and the second quantizers. The feedback signal is also produced in accordance with the outputs of the first and the second quantizers.
    • 在用于调制模拟输入信号以产生数字形式的调制信号的A / D转换器的Δ-Σ调制器中,第一积分器产生指示模拟输入信号和反馈之间的差的积分的第一积分信号 信号,第一延迟元件将第一积分信号延迟一个采样周期,第二积分器产生指示第一延迟元件的输出与反馈信号之间的差的积分的第二积分信号,第一量化器产生二 - 根据第二积分信号是否大于预定参考值,第二量化器根据第一和第二信号“1”或“0”是否产生两级信号“1”或“0” 积分信号大于预定参考值。 根据第一和第二量化器的输出产生输出数字信号。 还根据第一和第二量化器的输出产生反馈信号。
    • 8. 发明授权
    • Phosphonic diester derivatives
    • 膦酸二酯衍生物
    • US5985858A
    • 1999-11-16
    • US91946
    • 1998-06-26
    • Kazuyoshi MiyataYasuhiro SakaiYasuo ShojiYoshihiko TsudaYasuhide InoueKeigo SatoShinya Miki
    • Kazuyoshi MiyataYasuhiro SakaiYasuo ShojiYoshihiko TsudaYasuhide InoueKeigo SatoShinya Miki
    • C07F9/6509C07F9/6539C07F9/6553C07F9/6558C07F9/6561A61K31/67A61K31/675
    • C07F9/650964C07F9/6539C07F9/655345C07F9/65583C07F9/65586C07F9/6561
    • A phosphonic diester derivative represented by the following formula (1): ##STR1## wherein R.sup.1 represents a cycloalkyl group; a phenyl group which may have 1 to 3 substituents selected from the group consisting of a lower alkoxy group, a lower alkyl group, a halogen atom, a halogen-substituted lower alkyl group, a lower alkanoyl group, a nitro group, a benzoyl group, a cyano group, an N-lower alkylcarbamoyl group, an N-phenyl-lower alkylcarbamoyl group, an N-(halogen-substituted phenyl)carbamoyl group and an N,N-di-lower alkylcarbamoyl group; a 1,3,4-thiadiazol-2-yl group having a halogen-substituted lower alkyl group as a substituent; a thiazolyl group; a pyridyl group which may be substituted by a halogen atom; a benzothiazol-2-yl group having 1 to 2 lower alkoxy groups on the phenyl ring; or a 4,5-dihydrothieno[3,2-e]benzothiazol-2-yl group; R.sup.2 represents a hydrogen atom or a phenyl lower alkyl group; R.sup.3 and R.sup.4 each represents a lower alkyl group; and A represents a heterocyclic ring selected from the group consisting of a pyrazine ring, a thiophene ring and a phenyl-substituted thiazole ring; the derivative being of value as an agent for treating and preventing hyperlipidemia, diabetes and cataract, or as an antitumor agent.
    • PCT No.PCT / JP96 / 03775第 371日期:1998年6月26日 102(e)日期1998年6月26日PCT 1996年12月24日PCT公布。 公开号WO97 / 24360 PCT 日期:1997年7月10日由下式(1)表示的膦酸二酯衍生物:其中R1表示环烷基; 可以具有1〜3个选自低级烷氧基,低级烷基,卤素原子,卤素取代的低级烷基,低级烷酰基,硝基,苯甲酰基的取代基的苯基 ,氰基,N-低级烷基氨基甲酰基,N-苯基 - 低级烷基氨基甲酰基,N-(卤素取代的苯基)氨基甲酰基和N,N-二低级烷基氨基甲酰基; 具有卤素取代的低级烷基作为取代基的1,3,4-噻二唑-2-基; 噻唑基 可被卤素原子取代的吡啶基; 在苯环上具有1至2个低级烷氧基的苯并噻唑-2-基; 或4,5-二氢噻吩并[3,2-e]苯并噻唑-2-基; R2表示氢原子或苯基低级烷基; R3和R4各自表示低级烷基; A表示选自吡嗪环,噻吩环和苯基取代的噻唑环的杂环; 该衍生物作为治疗和预防高脂血症,糖尿病和白内障或作为抗肿瘤剂的药剂是有价值的。