公开(公告)号：US06992647B2

公开(公告)日：2006-01-31

申请号：US10360714

申请日：2003-02-10

申请人： Kouichi Hanada ,  Yuji Shimada ,  Masanori Fujisawa

发明人： Kouichi Hanada ,  Yuji Shimada ,  Masanori Fujisawa

IPC分类号： G09G5/00

CPC分类号： G09G3/3283 ,  G09G2310/027 ,  G09G2340/0428 ,  H03M1/70 ,  H03M1/745

摘要： An input side drive current of a D/A converter circuit is controlled by a switch circuit connected in series with at least one of a plurality of input side transistors connected in parallel to form a current mirror connection. By turning the switch circuit from ON to OFF, a constant current flowing through the input side transistor, which is turned OFF by the switch circuit, is distributed to the remaining input side transistors, resulting in a large D/A converted current in a current mirror connected output side transistor. Thus, it is possible to correspondingly reduce a value of a display data, so that the number of bit positions of the D/A converter circuit can be reduced by 1 or more.

公开(公告)号：US20050278267A1

公开(公告)日：2005-12-15

申请号：US10857278

申请日：2004-05-28

申请人： Shigeki Mabuchi ,  Masanori Fujisawa

发明人： Shigeki Mabuchi ,  Masanori Fujisawa

IPC分类号： G06F17/00 ,  G06F17/50 ,  G06F19/00 ,  G06Q10/00 ,  G06Q50/00

CPC分类号： G06F17/50 ,  G06F2217/74 ,  G06Q10/10 ,  G06Q50/04 ,  G06Q50/18 ,  G06Q99/00 ,  Y02P90/30

摘要： A technology for promoting distribution of IPs which constitute part of an integrated circuit is provided. An LSI maker concludes a contract for business alliance with an IP provider, acquires data on IPs from the IP provider, conducts layout, wiring, and verification of the acquired IPs, registers verified IPs into a library, and presents the same to a set maker. When the set maker orders for manufacturing of an LSI to the LSI maker, the LSI maker designs the logic of the integrated circuit, conducts layout, wiring, and timing simulation, and have evaluations from the set maker. Then, the LSI maker manufactures LSIs, delivers the same to the set maker, and receives the payment. The LSI maker calculates license fees, and pays them to the IP provider.

摘要翻译： 提供了构成集成电路一部分的IP分发技术。 LSI制造商与IP提供商签订了与业务联盟的合同，从IP提供商获取IP数据，对获取的IP进行布局，接线和验证，将验证的IP注册到图书馆中，并将其提交给设定者 。 当制造商向LSI制造商订购LSI的制造商时，LSI制造商设计了集成电路的逻辑，进行布局，布线和定时仿真，并从设定器进行评估。 然后，LSI制造商制造LSI，将其交付给设置者，并且接收付款。 LSI制造商计算许可证费用，并支付给IP提供商。

公开(公告)号：US06454172B1

公开(公告)日：2002-09-24

申请号：US09341116

申请日：1999-07-07

申请人： Hiroyuki Maeda ,  Masanori Fujisawa

发明人： Hiroyuki Maeda ,  Masanori Fujisawa

IPC分类号： G06K1906

CPC分类号： G06K19/07703 ,  G06K19/07 ,  G06K19/073

摘要： An IC card may externally display a response state in a data communication performed in response to externally applied data. IC card (100) is provided with a data protecting memory (3) for data holding memory (2). An abnormality determination circuit (1) determines how data in data holding memory (2) has been processed. If abnormality determination circuit (1) determines that the externally applied data has been normally written in data holding memory (2), a response state display (7) gives a normal communication completion indication in response to an instruction from a main control circuit (11). Meanwhile, if the presence of an abnormality is determined in the state of writing data, and the data in data holding memory (2) has been recovered using data in data protecting memory (3), response state display (7) gives a data recovery indication. If the recovery of the data is not successful, a communication abnormality indication is made.

摘要翻译： IC卡可以在响应于外部应用的数据执行的数据通信中外部显示响应状态。 IC卡（100）设置有用于数据保持存储器（2）的数据保护存储器（3）。 异常确定电路（1）确定数据保持存储器（2）中的数据如何被处理。 如果异常确定电路（1）确定外部应用的数据已被正常地写入数据保持存储器（2），则响应状态显示（7）响应于来自主控制电路（11）的指令给出正常的通信完成指示 ）。 同时，如果在写入数据的状态下确定了异常的存在，并且使用数据保护存储器（3）中的数据恢复了数据保持存储器（2）中的数据，则响应状态显示（7）给出数据恢复 指示。 如果数据的恢复不成功，则进行通信异常指示。

公开(公告)号：US06266425B1

公开(公告)日：2001-07-24

申请号：US09433048

申请日：1999-11-03

申请人： Masanori Fujisawa ,  Takemi Irokawa

发明人： Masanori Fujisawa ,  Takemi Irokawa

IPC分类号： H03F2100

CPC分类号： H03F3/2175

摘要： An audio signal amplifier circuit and an audio device are characterized by comprising: an arithmetic circuit which receives digital audio signals and generates in response to digital control signals for sound volume adjustment, calculated digital values corresponding to the sound volume adjustment; a D/A converter circuit which D/A converts the calculated digital values from the arithmetic circuit and generates analogue values; a pulse generating circuit which generates pulses having a predetermined frequency of which generation period is PWM-modulated in response to output analogue values of the D/A converter circuit; and a driving current generating circuit which receives the pulses of the pulse generating circuit and generates current values corresponding to the PWM modulation, and wherein a speaker is driven in response to outputs from the current value generating circuit.

摘要翻译： 音频信号放大器电路和音频装置的特征在于包括：运算电路，其接收数字音频信号，并响应于用于音量调节的数字控制信号产生与音量调整相对应的计算的数字值; D / A转换器电路，其D / A转换来自运算电路的计算出的数字值并产生模拟值; 脉冲发生电路，响应于D / A转换器电路的输出模拟值产生具有预定频率的脉冲，所述预定频率的发生周期被PWM调制; 以及驱动电流产生电路，其接收脉冲发生电路的脉冲并产生对应于PWM调制的电流值，并且其中响应于来自电流值产生电路的输出驱动扬声器。

公开(公告)号：US5424684A

公开(公告)日：1995-06-13

申请号：US203307

申请日：1994-03-01

申请人： Kei Nishioka ,  Masanori Fujisawa

发明人： Kei Nishioka ,  Masanori Fujisawa

IPC分类号： H03F1/02 ,  H03F3/217 ,  H03F3/26

CPC分类号： H03F1/0233 ,  H03F3/217

摘要： The present invention includes a first push-pull amplifier for amplifying an audio signal, a second push-pull amplifier for inverting and amplifying the audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier and a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power, a loud speaker being driven by outputs of the first and second amplifiers.

摘要翻译： 本发明包括用于放大音频信号的第一推挽放大器，用于反转和放大音频信号的第二推挽放大器，用于以超过可听频率的频率从电源线切换电力的开关电路， 第一或第二放大器和用于控制开关电路的开关周期的控制电路，使得馈送功率对应于音频信号的电平相应于音频信号和音频信号中的一个之间的电压的第一差异而改变 通过放大器放大的功率或由第二放大器放大的音频信号和音频信号之一之间的功率或第二电压差，由扬声器由第一和第二放大器的输出驱动。

公开(公告)号：US5325440A

公开(公告)日：1994-06-28

申请号：US47014

申请日：1993-04-14

申请人： Masanori Fujisawa ,  Hiroshi Kojima

发明人： Masanori Fujisawa ,  Hiroshi Kojima

IPC分类号： H03G5/02 ,  H03F3/181 ,  H03F3/68 ,  H03G5/04 ,  H03G9/14 ,  H03G9/00

CPC分类号： H03G5/04 ,  H03G9/14

摘要： A loudness control circuit emphasizes low frequency components in audio signals. A secondary low-pass filter select low frequency components of the audio signals, inverting a phase of the audio signals. The phase-inverted signals and audio signals are respectively inputted to an inverting input terminal and non-inverting input terminal of an operational amplifier to obtain audio signals whose low frequency components are emphasized. These signals have the same phase as the phase of the inputted audio signals. The output of the low-pass filter is amplified to obtain a signal having low frequency components whose phase is inverted. Both the audio signal whose low frequency components have been amplified and the low frequency components whose phase has been inverted are applied to a speaker to reproduce sounds with their low frequency components dynamically emphasized.

摘要翻译： 响度控制电路强调音频信号中的低频分量。 二级低通滤波器选择音频信号的低频分量，反相音频信号的相位。 相位反转信号和音频信号分别输入到运算放大器的反相输入端和非反相输入端，以获得强调低频分量的音频信号。 这些信号与输入的音频信号的相位具有相同的相位。 低通滤波器的输出被放大以获得具有相位反相的低频分量的信号。 其低频分量被放大的音频信号和相位已被反相的低频分量都被施加到扬声器，以便动态地强调其低频分量再现声音。

公开(公告)号：US4801889A

公开(公告)日：1989-01-31

申请号：US108104

申请日：1987-10-13

申请人： Masanori Fujisawa

发明人： Masanori Fujisawa

IPC分类号： H03F1/00 ,  H03F3/20 ,  H03F3/68

CPC分类号： H03F3/68

摘要： An amplifier comprises a first amplifier circuit and a second amplifier circuit. An input signal voltage and an input DC bias voltage are applied to the first amplifier circuit, and an input DC bias voltage is applied to the second amplifier circuit. The input DC bias voltages applied to the first amplifier circuit and the second amplifier circuit are common to each other. Output bias voltages of the first amplifier circuit and the second amplifier circuit become equal to each other. The amplified signal voltages are applied to a load connected between outputs of the amplifier circuits.

摘要翻译： 放大器包括第一放大器电路和第二放大器电路。 输入信号电压和输入直流偏置电压被施加到第一放大器电路，并且输入的直流偏置电压被施加到第二放大器电路。 施加到第一放大器电路和第二放大器电路的输入DC偏置电压彼此相同。 第一放大电路和第二放大电路的输出偏置电压变得彼此相等。 放大的信号电压被施加到连接在放大器电路的输出端之间的负载。