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21. 发明申请

US20070188220A1 Digital amplifier apparatus and method of muting digital amplifier apparatus 有权
标题翻译：数字放大器装置和静噪数字放大器装置的方法
公开(公告)号：US20070188220A1
公开(公告)日：2007-08-16
申请号：US11643627
申请日：2006-12-21
申请人： Toshihiko Masuda , Yusuke Yamamoto , Arihiro Moroboshi
发明人： Toshihiko Masuda , Yusuke Yamamoto , Arihiro Moroboshi
IPC分类号： H03F3/38
CPC分类号： H03F3/2173
摘要： A digital amplifier apparatus includes a gain-adjusting section operable to adjust a gain of a digital audio signal; a dither-superposing section operable to superpose a predetermined dither on the digital audio signal; a pulse-width-modulated signal generating section operable to generate a pulse-width-modulated signal corresponding to the digital audio signal; an amplifying section operable to cause a switching element to perform a switching operation in accordance with the pulse-width-modulated signal; a pulse-width changing section operable to change a ratio between a “high” state and a “low” state of the pulse-width modulated signal; and a control section operable to perform a muting process by causing the gain-adjusting section to set the gain of the digital audio signal to a zero level, the dither-superposing section to stop superposing the dither, and the pulse-width changing section to change, step by step, the ratio between the “high” state and the “low” state of the pulse-width modulated signal toward the “low” state upon receipt of a predetermined muting signal for muting the digital audio signal, thereby maintaining the “low” state and stopping the switching operation performed in accordance with the pulse-width modulated signal.
摘要翻译：数字放大器装置包括可调节数字音频信号增益的增益调整部分; 抖动叠加部分，可操作以在数字音频信号上叠加预定的抖动; 脉冲宽度调制信号产生部分，用于产生对应于数字音频信号的脉冲宽度调制信号; 放大部分，其可操作以使开关元件根据所述脉冲宽度调制信号执行切换操作; 脉冲宽度改变部分，用于改变所述脉冲宽度调制信号的“高”状态和“低”状态之间的比率; 以及控制部，其可操作以通过使所述增益调整部将所述数字音频信号的增益设定为零电平来进行静音处理，所述抖动重叠部将所述抖动重叠，所述脉冲宽度变更部变为在接收到用于使数字音频信号静音的预定静噪信号时，逐步地改变脉冲宽度调制信号的“高”状态与“低”状态之间的比例朝向“低”状态的比例，由此保持 “低”状态，并且停止根据脉宽调制信号执行的切换操作。

22. 发明授权

US07221297B2 D/A converter and output amplifying circuit 有权
标题翻译： D / A转换器和输出放大电路
公开(公告)号：US07221297B2
公开(公告)日：2007-05-22
申请号：US10250325
申请日：2002-10-23
申请人： Kazunobu Ohkuri , Toshihiko Masuda
发明人： Kazunobu Ohkuri , Toshihiko Masuda
IPC分类号： H03M1/10
CPC分类号： H03F3/2175 , H03F2200/331 , H03M3/37 , H03M3/506
摘要： A D/A converter in which distortion caused by PWM is favorably removed even if a sampling frequency is low relative to a signal frequency is provided. The D/A converter includes a pulse-width-modulated-signal outputting circuit for outputting a pulse-width-modulated signal having a pulse width in accordance with a digital value of an input digital signal. A distortion-correcting-component generating circuit (3) for generating from the input digital signal at least a correcting component corresponding to a distortion component generated in the pulse-width-modulated-signal outputting circuit; a subtractor circuit (2) disposed at an upstream of the pulse-width-modulated-signal outputting circuit, for subtracting the correcting component generated by the distortion-correcting-component generating circuit from the input digital signal; and a phase correcting circuit (10) for correcting phase characteristics of the input digital signal so that the distortion component and the correcting component have a phase difference such that these components have opposite phases in the pulse-width-modulated-signal outputting circuit; are provided.
摘要翻译：提供了即使采样频率相对于信号频率较低也能够有效地去除由PWM引起的失真的D / A转换器。 D / A转换器包括脉冲宽度调制信号输出电路，用于根据输入数字信号的数字值输出具有脉冲宽度的脉宽调制信号。一种失真校正分量产生电路（3），用于从所述输入数字信号产生至少一个对应于在所述脉冲宽度调制信号输出电路中产生的失真分量的校正分量; 设置在所述脉冲宽度调制信号输出电路的上游的减法电路，用于从所述输入数字信号中减去由所述失真校正分量产生电路产生的校正分量; 以及用于校正输入数字信号的相位特性的相位校正电路（10），使得失真分量和校正分量具有这样的相位差，使得这些分量在脉冲宽度调制信号输出电路中具有相反的相位; 被提供。

23. 发明申请

US20060022752A1 Power amplifier apparatus and DC component removing method 有权
标题翻译：功率放大器和直流分量去除方法
公开(公告)号：US20060022752A1
公开(公告)日：2006-02-02
申请号：US11185799
申请日：2005-07-21
申请人： Takuro Akiyama , Toshihiko Masuda
发明人： Takuro Akiyama , Toshihiko Masuda
IPC分类号： H03F3/217
CPC分类号： H03F1/304 , H03F3/217 , H03F3/2175 , H03F2200/331
摘要： A power amplifier apparatus includes a dither superimposing unit superimposing DC dither on a digital signal; a switching signal generating unit converting the digital signal on which the DC dither is superimposed by the dither superimposing unit to a pair of drive pulses on high and low sides having opposite levels; and a cancel signal generating unit generating a cancel signal to cancel a DC component caused by the DC dither by changing a ratio of pulse widths of the drive pulses on the high and low sides generated by the switching signal generating unit.
摘要翻译：功率放大器装置包括将数字信号重叠DC抖动的抖动叠加单元; 切换信号生成单元，将由所述抖动叠加单元叠加了所述DC抖动的数字信号转换为具有相反电平的高低侧的一对驱动脉冲; 以及消除信号生成单元，其通过改变由切换信号生成单元生成的高低侧的驱动脉冲的脉冲宽度的比率，生成消除由DC抖动引起的DC分量的消除信号。

24. 发明授权

US06795004B2 Delta-sigma modulation apparatus and signal amplification apparatus 失效
标题翻译： Δ-Σ调制装置和信号放大装置
公开(公告)号：US06795004B2
公开(公告)日：2004-09-21
申请号：US10416443
申请日：2003-05-12
申请人： Toshihiko Masuda , Kazunobu Ohkuri
发明人： Toshihiko Masuda , Kazunobu Ohkuri
IPC分类号： H03M300
CPC分类号： H03F3/217 , H03F2200/331 , H03M3/388 , H03M3/506 , H03M7/3026 , H03M7/3031
摘要： A signal amplifier apparatus adapted for carrying out delta-sigma modulation of an input signal to carry out pulse width modulation (PWM) of that signal, to obtain a PWM signal, and to amplify this PWM signal so that a signal of a predetermined magnitude is obtained, wherein the signal amplifier apparatus includes a correction circuit for correcting an output of a quantizer provided in a delta-sigma modulation device. The correction circuit is installed in a feedback path with respect to the input side from the quantizer or immediately before a pulse width modulator to thereby correct distortion taking place in the amplifier. In addition, the signal amplifier apparatus invention compares PWM signals at the input and the output of the amplifier to correct the output of the quantizer that is provided in the delta-sigma modulation device, so as to cancel distortion taking place in the amplifier in accordance with respective rising time difference and falling time difference to thereby correct distortion.
摘要翻译：一种信号放大器装置，适用于对输入信号进行Δ-Σ调制，以执行该信号的脉宽调制（PWM），获得PWM信号，并放大该PWM信号，使得预定幅度的信号为其中所述信号放大器装置包括用于校正设置在Δ-Σ调制装置中的量化器的输出的校正电路。校正电路相对于来自量化器的输入侧或紧接在脉冲宽度调制器之前安装在反馈路径中，从而校正在放大器中发生的失真。此外，信号放大装置本发明比较放大器的输入和输出端的PWM信号，以校正在Δ-Σ调制装置中提供的量化器的输出，从而根据放大器中发生的失真消除具有各自的上升时间差和下降时间差，从而校正失真。

25. 发明授权

US06362765B1 D/A converter 有权
公开(公告)号：US06362765B1
公开(公告)日：2002-03-26
申请号：US09809400
申请日：2001-03-15
申请人： Toshihiko Masuda
发明人： Toshihiko Masuda
IPC分类号： H03M106
摘要： An object of this invention is to provide a D/A converter of a multibit type for improving its performance by reducing dispersion of the electric currents of plural electric current sources as much as possible. To achieve this object, the D/A converter has a constant electric current source (10) constructed by 2N (N=2, 3, - - - and here, N=16) constant electric current sources having constant electric current values equal to each other; selecting means (7, 8) for selecting Di constant electric current sources according to input data Di {here, Di=0, 1, 2, 3, - - - , (2N−1)} having N-bits in input word length so as to use these 2N constant electric current sources one by one until a sum of values of one input data or continuous plural input data among these 2N constant electric current sources exceeds 2N; and electric current adding means (9) for adding each of the constant electric currents from the Di constant electric current sources selected by the selecting means to each other.

26. 发明授权

US06281824B1 Digital to analog converter using constant current sources 失效
标题翻译：使用恒流源的数模转换器
公开(公告)号：US06281824B1
公开(公告)日：2001-08-28
申请号：US09416087
申请日：1999-10-12
申请人： Toshihiko Masuda
发明人： Toshihiko Masuda
IPC分类号： H03M166
CPC分类号： H03M1/0872 , H03K17/04113 , H03K17/6264 , H03M1/747
摘要： A D/A converter of a multibit type has improved performance by reducing dispersion of the electric currents of plural electric current sources as much as possible in which the D/A converter has a constant electric current source (10) constructed by 2N (N=2, 3, - - - and here, N=16) constant electric current sources having constant electric current values equal to each other; selectors (7, 8) for selecting Di constant electric current sources according to input data Di {here, Di=0, 1, 2, 3, - - - , (2N−1)} having N-bits in input word length so as to use these 2N constant electric current sources one by one until a sum of values of one input data or continuous plural input data among these 2N constant electric current sources exceeds 2N; and an electric current adder (9) for adding each of the constant electric currents from the Di constant electric current sources selected by the selectors to each other.
摘要翻译： AD / A转换器通过尽可能多地减少多个电流源的电流的散射来提高性能，其中D / A转换器具有由2N构成的恒定电流源（10）（N = 2 ，3， - - - ，这里为N = 16）恒定电流源，其恒定电流值彼此相等; 用于根据输入字长为N位的输入数据Di {这里，Di = 0,1,2,3，...，（2N-1）}选择Di恒定电流源的选择器（7,8）一直使用这2N个恒定电流源，直到这2N个恒定电流源中的一个输入数据或连续的多个输入数据的值的和超过2N; 以及电流加法器（9），用于将由选择器选择的Di恒定电流源中的每个恒定电流彼此相加。

27. 发明授权

US5144306A Noise shaping circuit 失效
标题翻译：噪声形状电路
公开(公告)号：US5144306A
公开(公告)日：1992-09-01
申请号：US759930
申请日：1991-09-13
申请人： Toshihiko Masuda
发明人： Toshihiko Masuda
IPC分类号： H03H17/02 , H03M3/02 , H04B14/04
CPC分类号： H04B14/046
摘要： A noise shaping circuit includes a first degree noise shaping arrangement in which a quantization error component at a first quantizer adapted for quantizing input signals is fed back to an input side, and in which a quantization error component at the first quantizer is fed back by a predetermined feedback circuit to an input of the first quantizer. The feedback circuit includes a synthesizing unit supplied with an error signal from a first quantization error output unit, a second quantizer for quantizing an output signal from the synthesizing unit, a second quantization error output unit for taking out a quantization error at the second quantizer, a transfer characteristic unit having predetermined transfer characteristics, and a differentiation unit supplied with output signals from the second quantizer. Error signals from the second quantization error output unit are supplied to the transfer characteristic unit, the output of which is supplied to the synthesizing unit.

28. 发明授权

US3959441A Desulfurization process 失效
标题翻译：脱硫工艺
公开(公告)号：US3959441A
公开(公告)日：1976-05-25
申请号：US431158
申请日：1974-01-07
申请人： Isao Furuta , Kazuhito Yagaki , Toshihiko Masuda
发明人： Isao Furuta , Kazuhito Yagaki , Toshihiko Masuda
IPC分类号： B01D53/50 , C01B17/00
CPC分类号： B01D53/507
摘要： Sulphur dioxide is removed from a stack gas by bringing said gas containing SO.sub.2 into contact with an absorbing solution prepared by adding an hydroxide of a metal from either Groups II, III and VIII of the periodic Table to an aqueous solution of a halide of said metal, wherein the hydroxide is present in an amount of from 0.3 to 0.8 weight percent.
摘要翻译：通过将含有SO 2的气体与通过将周期表第II，III和VIII族的金属的氢氧化物加入到所述金属的卤化物的水溶液中而制备的吸收溶液接触来从堆叠气体中除去二氧化硫，其中氢氧化物以0.3至0.8重量％的量存在。

29. 发明申请

US20050174176A1 Power amplification device 有权
标题翻译：功率放大器
公开(公告)号：US20050174176A1
公开(公告)日：2005-08-11
申请号：US10514178
申请日：2003-05-01
申请人： Kazunobu Ohkuri , Toshihiko Masuda
发明人： Kazunobu Ohkuri , Toshihiko Masuda
IPC分类号： H03F3/217 , H03F3/30 , H04B15/06 , H03F3/18
CPC分类号： H03F3/2173 , H03F3/2171 , H03F2200/331
摘要： A class D power amplifier (1) switches a power supply voltage VDD at high-speed in response to an input digital audio signal Pin to power-amplify the digital audio signal Pin, and supplies a speaker (2) with the amplified signal. In the case of being incorporated in an AM receiver formed integrally with an AM tuner (3) for receiving AM broadcasts, the class D power amplifier (1) can reduces influence of reception interference with respect to the AM tuner (3). As a result, it is possible to provide a power amplifier that can suppress unnecessary radiation to reduce reception interference with respect to the tuner, not by changing a carrier frequency, but by controlling the drive signal generation systems.
摘要翻译： D类功率放大器（1）响应于中的输入数字音频信号P _{高速切换电源电压V DD，以对数字音频进行放大信号P _{，并向扬声器（2）提供放大信号。在与用于接收AM广播的AM调谐器（3）一体形成的AM接收机的情况下，D类功率放大器（1）可以减少对AM调谐器（3）的接收干扰的影响。结果，可以提供能够抑制不必要的辐射的功率放大器，而不是通过改变载波频率而是通过控制驱动信号发生系统来减少对调谐器的接收干扰。}}

30. 发明授权

US06586991B2 Digital power amplifier 失效
标题翻译：数字功率放大器
公开(公告)号：US06586991B2
公开(公告)日：2003-07-01
申请号：US09992605
申请日：2001-11-14
申请人： Toshihiko Masuda , Kazunobu Ohkuri
发明人： Toshihiko Masuda , Kazunobu Ohkuri
IPC分类号： H03F338
CPC分类号： H03F3/2171 , H03F2200/331
摘要： A digital power amplifier including a switching control device for generating a first switching control signal and a second switching control signal which results from inverting the first switching control signal at an equal timing based upon an inputted audio signal, wherein the first and second switching control signals generated from the switching control device are respectively supplied to control terminals of first and second switching devices so that the first and second switching devices are driven in a push-pull manner to produce an audio signal amplified when the power source is switched. Output characteristics are prevented from being deteriorated by noise from the power source by canceling out radiation of the signals generated from the two switching devices and deterioration of outputted audio characteristics due to noise from the power source is prevented.
摘要翻译：一种数字功率放大器，包括用于产生第一开关控制信号的开关控制装置和基于输入的音频信号以相同的定时使第一开关控制信号反相产生的第二开关控制信号，其中第一和第二开关控制信号从开关控制装置产生的信号分别提供给第一和第二开关装置的控制端子，使得第一和第二开关装置以推挽方式被驱动以产生在切换电源时放大的音频信号。通过消除由两个开关装置产生的信号的辐射，防止输出特性被来自电源的噪声恶化，并且防止了由于来自电源的噪声导致的输出音频特性的恶化。

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