公开(公告)号：US07132884B2

公开(公告)日：2006-11-07

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： H03F3/38

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。}

公开(公告)号：US20050285670A1

公开(公告)日：2005-12-29

申请号：US10536999

申请日：2003-12-12

申请人： Kazunobu Ohkuri ,  Toshihiko Masuda

发明人： Kazunobu Ohkuri ,  Toshihiko Masuda

IPC分类号： H03F1/26 ,  H03F3/181 ,  H03F3/217 ,  H03G3/34 ,  H03M3/04 ,  H03F3/38

CPC分类号： H03F3/2175 ,  H03F3/181 ,  H03F2200/331 ,  H03G3/34 ,  H03M3/328 ,  H03M3/346 ,  H03M3/506

摘要： In an audio amplifier having a D-class power amplifier, a noise upon muting is suppressed. There are provided a sampling rate converter circuit 23 for sampling rate converting a digital audio signal S11 into a digital audio signal S23, and a ΔΣ modulation circuit 14 for re-quantizing the digital audio signal S23 into a bit-reduced digital audio signal S14. Further, there are provided a PWM modulation circuit 15 for converting the digital audio signal S14 into a PWM signal S15, and a D-class power amplifier 16 to which the PWM signal S15 is supplied. Still further, there are provided a dither signal forming circuit 18 for superimposing a dither signal SDI on the digital audio signal S23, and a forming circuit 19 for forming a muting signal SDET. Upon muting, an input side of the sampling rate converter circuit 23 is stopped by the muting signal SDET.

摘要翻译： 在具有D级功率放大器的音频放大器中，抑制静音时的噪声。 提供了用于将数字音频信号S11进行采样率转换为数字音频信号S23的采样率转换器电路23和用于将数字音频信号S 23重新量化为比特缩小的数字音频的DeltaSigma调制电路14 信号S 14。 此外，还提供了用于将数字音频信号S14转换为PWM信号S15的PWM调制电路15以及供给PWM信号S15的D级功率放大器16。 另外，还提供了用于将抖动信号SDI叠加在数字音频信号S23上的抖动信号形成电路18和用于形成静噪信号SDET的形成电路19。 在静音时，采样率转换器电路23的输入侧被静噪信号SDET停止。

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。

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。

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。}

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。

公开(公告)号：US07209002B2

公开(公告)日：2007-04-24

申请号：US10536999

申请日：2003-12-12

申请人： Kazunobu Ohkuri ,  Toshihiko Masuda

发明人： Kazunobu Ohkuri ,  Toshihiko Masuda

IPC分类号： H03F3/38

CPC分类号： H03F3/2175 ,  H03F3/181 ,  H03F2200/331 ,  H03G3/34 ,  H03M3/328 ,  H03M3/346 ,  H03M3/506

摘要： In an audio amplifier having a D-class power amplifier, a noise upon muting is suppressed. A sampling rate converter circuit for sampling rate converting a digital audio signal into a digital audio signal, and a ΔΣ modulation circuit for re-quantizing the digital audio signal into a bit-reduced digital audio signal are provided. Further, a PWM modulation circuit for converting the digital audio signal into a PWM signal, and a D-class power amplifier to which the PWM signal are supplied. Still further, a dither signal forming circuit for superimposing a dither signal SDI on the digital audio signal, and a forming circuit for forming a muting signal SDET are provided. Upon muting, an input side of the sampling rate converter circuit is stopped by the muting signal SDET.

摘要翻译： 在具有D级功率放大器的音频放大器中，抑制静音时的噪声。 提供了一种用于将数字音频信号转换为数字音频信号的采样率的采样率转换器电路和用于将数字音频信号重新量化为比特减小数字音频信号的DeltaSigma调制电路。 此外，用于将数字音频信号转换为PWM信号的PWM调制电路以及供给PWM信号的D级功率放大器。 此外，还提供了一种用于将抖动信号SDI叠加在数字音频信号上的抖动信号形成电路和用于形成静噪信号SDET的形成电路。 在静音时，采样率转换器电路的输入侧由静噪信号SDET停止。

公开(公告)号：US06917242B2

公开(公告)日：2005-07-12

申请号：US10466927

申请日：2002-11-07

申请人： Toshihiko Masuda ,  Kazunobu Ohkuri

发明人： Toshihiko Masuda ,  Kazunobu Ohkuri

IPC分类号： H03K17/16 ,  H03F1/26 ,  H03F3/217 ,  H03F3/30 ,  H03K17/695 ,  H03F3/38

CPC分类号： H03F1/26 ,  H03F3/217 ,  H03F3/2173 ,  H03F3/3027 ,  H03F2200/331

摘要： A power amplifier for reducing emission generated at the edges of output voltages. A pair of PWM modulation circuits (11) and (12) to which an input signal is sent; a pair of push-pull circuits (15) and (16); and drive circuits (13) and (14) for sending the outputs of the PWM modulation circuits (11) and (12) as drive signals to the push-pull circuits (15) and (16) are provided. A speaker (19) is connected between the output end of the push-pull circuit (15) and the output end of the push-pull circuit (16). The drive circuits (13) and (14) are switched at intervals equal to the cycle period of pulse modulation signals such that the drive signals sent to the push-pull circuits (15) and (16) are not changed at the end points of each cycle period of the pulse modulation signals.

摘要翻译： 一种功率放大器，用于减少在输出电压边缘产生的发射。 一对输入信号被发送到的PWM调制电路（11）和（12） 一对推挽电路（15）和（16）; 并且提供用于将PWM调制电路（11）和（12）的输出作为驱动信号发送到推挽电路（15）和（16）的驱动电路（13）和（14）。 扬声器（19）连接在推挽电路（15）的输出端与推挽电路（16）的输出端之间。 驱动电路（13）和（14）以等于脉冲调制信号的周期的间隔进行切换，使得发送到推挽电路（15）和（16）的驱动信号在端点 每个周期的脉冲调制信号。

公开(公告)号：US06734725B2

公开(公告)日：2004-05-11

申请号：US10299580

申请日：2002-11-19

申请人： Toshihiko Masuda ,  Kazunobu Ohkuri

发明人： Toshihiko Masuda ,  Kazunobu Ohkuri

IPC分类号： H03F338

CPC分类号： H03F3/2173 ,  H03F3/3027 ,  H03F2200/331

摘要： A power amplifier circuit includes a pair of PWM circuits, to which an input signal is supplied, a pair of push-pull circuits, and drive circuits for supplying the outputs of the PWM circuits to the push-pull circuits as drive signals. A speaker is arranged between the output end of one push-pull circuit and the output end of the other push-pull circuit. The drive circuits alternately drive the respective push-pull circuits every cycle time of a PWM signal. The circuit can suppress radiation caused by the variation in output voltages.

摘要翻译： 功率放大器电路包括供给输入信号的一对PWM电路，一对推挽电路和用于将PWM电路的输出作为驱动信号提供给推挽电路的驱动电路。 扬声器布置在一个推挽电路的输出端和另一个推挽电路的输出端之间。 驱动电路在PWM信号的每周期时间交替地驱动相应的推挽电路。 电路可以抑制由输出电压变化引起的辐射。

公开(公告)号：US07528662B2

公开(公告)日：2009-05-05

申请号：US11490191

申请日：2006-07-21

申请人： Takahiro Noda ,  Toshihiko Masuda ,  Manabu Yamanaka ,  Takashi Takano

发明人： Takahiro Noda ,  Toshihiko Masuda ,  Manabu Yamanaka ,  Takashi Takano

IPC分类号： H03F3/04

CPC分类号： H03F3/2173 ,  H03F1/0211 ,  H03F1/30 ,  H03F3/181 ,  H03F3/68 ,  H03F2200/504

摘要： A signal amplification apparatus which supplies an input signal to a signal processing section to perform signal processing on the input signal, amplifies a power supply voltage supplied from a power source section in accordance with the processed signal, and outputs the amplified power supply voltage. The apparatus includes output decrease prediction means for predicting decrease of the output signal on the basis of an amplitude of the input signal; power supply voltage correction signal generation means for generating a power supply voltage correction signal for correcting the power supply voltage of the power source section on the basis of the predicted decrease of the output signal; and feedforward control means for performing feedforward control of the power supply voltage of the power source section by using the power supply voltage correction signal.

摘要翻译： 一种信号放大装置，其向信号处理部提供输入信号以对输入信号进行信号处理，根据处理的信号放大从电源部提供的电源电压，并输出放大的电源电压。 该装置包括：输出减少预测装置，用于根据输入信号的幅度预测输出信号的减小; 电源电压校正信号产生装置，用于根据预测的输出信号的减小产生用于校正电源部分的电源电压的电源电压校正信号; 以及前馈控制装置，用于通过使用电源电压校正信号来执行对电源部分的电源电压的前馈控制。