公开(公告)号：JP2013118628A

公开(公告)日：2013-06-13

申请号：JP2012239612

申请日：2012-10-30

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： NORO MASAO

IPC: H03F3/217 ,  H03L7/00

CPC classification number: H03F3/217 ,  H03F2200/333 ,  H03K2005/00032 ,  H03L7/0812

Abstract: PROBLEM TO BE SOLVED: To provide a self-oscillating class D amplifier that stabilizes an oscillation frequency.SOLUTION: A self-oscillation frequency variation element is arranged in a self-oscillation loop of the self-oscillating class D amplifier to vary the self-oscillation frequency of the self-oscillation loop. A self-oscillation signal of the self-oscillating class D amplifier or a signal corresponding to the self-oscillation signal is compared with a reference frequency signal having a predetermined reference frequency in terms of frequency, period or phase. Alternatively, information equivalent to the frequency or period of the self-oscillation signal of the self-oscillating class D amplifier or the signal corresponding to the self-oscillation signal is compared with information equivalent to the predetermined reference frequency or reference period. The self-oscillation frequency variation element is controlled in accordance with the result of comparison to match the frequency of the self-oscillation signal or the signal corresponding to the self-oscillation signal to the frequency of the reference frequency signal.

Abstract translation: 要解决的问题：提供稳定振荡频率的自振荡D类放大器。 解决方案：在自振荡D类放大器的自振荡环路中设置自振频率变化元件，以改变自振荡环路的自振频率。 将自振荡D类放大器的自振荡信号或对应于自振荡信号的信号与频率，周期或相位方面具有预定参考频率的参考频率信号进行比较。 或者，将与自振荡D类放大器的自振荡信号的频率或周期相当的信息或与自振荡信号相对应的信号的信息与等于预定参考频率或参考周期的信息进行比较。 根据比较结果控制自振频率变化元件，以将自振荡信号或对应于自振荡信号的信号的频率与参考频率信号的频率相匹配。 版权所有（C）2013，JPO＆INPIT

公开(公告)号：JP2009044529A

公开(公告)日：2009-02-26

申请号：JP2007208111

申请日：2007-08-09

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： KANO MASAYA ,  KAWAI HIROSHIGE ,  NORO MASAO

IPC: H03F3/72 ,  H03F3/68 ,  H04R3/00

CPC classification number: H03F3/181 ,  H03F1/0211 ,  H03F1/0277 ,  H03F1/34 ,  H03F2200/03 ,  H03F2200/393

Abstract: PROBLEM TO BE SOLVED: To provide a signal amplifier, an amplifying system and a signal amplifying method which simply reduces power consumption of a power amplifier when the power amplifier is not required.
SOLUTION: The amplifying system 1 reduces power consumption in the power amplifying unit 4 when the power amplifying unit 4 is not required. On the other hand, the power consumption in the power amplifying unit 4 is reduced by stopping power supply to a voltage amplifying stage 41 through a voltage control unit 12 and power supply condition from a power supply unit 10 to a power amplifying stage 42 is not changed. It is only required to control the power supply of the voltage amplifying stage 41 through which a large amount of current does not flow. A limiter means available for other uses is used for control, so that it is not required to increase the scale of circuit and the power consumption of the power amplifying unit 4 can simply be reduced while saving space.
COPYRIGHT: (C)2009,JPO&INPIT

Abstract translation: 要解决的问题：提供一种信号放大器，放大系统和信号放大方法，其在功率放大器不需要时简单地降低功率放大器的功耗。 解决方案：当不需要功率放大单元4时，放大系统1降低功率放大单元4中的功耗。 另一方面，功率放大单元4的功耗通过停止通过电压控制单元12向电压放大级41的供电而被减小，并且从电源单元10到功率放大级42的电源条件不是 改变了 仅需要控制不流过大电流的电压放大级41的电源。 用于其他用途的限制器装置用于控制，使得不需要增加电路规模，并且可以简单地减少功率放大单元4的功率消耗，同时节省空间。 版权所有（C）2009，JPO＆INPIT

公开(公告)号：JP2007208919A

公开(公告)日：2007-08-16

申请号：JP2006028629

申请日：2006-02-06

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： TSUJI NOBUAKI ,  NORO MASAO ,  KANO MASAYA

IPC: H03F3/217 ,  H03K19/0185

Abstract: PROBLEM TO BE SOLVED: To provide a level shift circuit capable of eliminating the need for an internal power source, thereby reducing the manufacturing cost.
SOLUTION: The level shift circuit 502 comprises: two transistors MP1, MP2; a resistor R511 connected between a drain and a source of the transistor MP2; a resistor R512 connected between a drain and a source of the transistor MP1; a capacitor C 511 whose one end is connected to the drain of the transistor MP2 and whose other end receives a high level signal or a low level signal; a capacitor C 512 whose one end is connected to the drain of the transistor MP1 and whose other end receives a high level signal or a low level signal; and the circuit 502 is configured such that each source of the transistors MP1, MP2 is connected to a positive power supply VPP+, and each gate of one of the transistors MP1, MP2 is connected to each drain of the other of the transistors MP1, MP2.
COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：提供能够消除对内部电源的需要的电平移位电路，从而降低制造成本。 电平移位电路502包括：两个晶体管MP1，MP2; 连接在晶体管MP2的漏极和源极之间的电阻器R511; 连接在晶体管MP1的漏极和源极之间的电阻器R512; 一个电容器C 511，其一端连接到晶体管MP2的漏极，另一端接收高电平信号或低电平信号; 电容器C 512，其一端连接到晶体管MP1的漏极，另一端接收高电平信号或低电平信号; 并且电路502被配置为使得晶体管MP1，MP2的每个源极连接到正电源VPP +，并且晶体管MP1，MP2中的一个的每个栅极连接到晶体管MP1，MP2中的另一个的每个漏极 。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2007013730A

公开(公告)日：2007-01-18

申请号：JP2005193071

申请日：2005-06-30

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： NORO MASAO ,  ARAI AKIRA

IPC: H04R1/02 ,  H04R1/28

CPC classification number: H04R1/2834 ,  H04R1/2888

Abstract: PROBLEM TO BE SOLVED: To increase and output the low band even if a speaker enclosure is small.
SOLUTION: When the speaker 10 is activated, vibrations of cone paper of the speaker 10 are propagated to the air in the speaker enclosure 20. A vibration region 30a of a diaphragm 30 is vibrated by the vibrations of the air. At that time, the diaphragm 30 vibrating while it is kept airtight by an edge 40 compresses or decompresses the air volume in the speaker enclosure 20 when it vibrates. Accordingly, another resonance frequency is generated between the compliance to which an air spring of the speaker enclosure 20 is added in addition to the elasticity of the diaphragm 30 and the equivalent mass of the diaphragm 30. As a result, sound is generated as reproduced around the resonance frequency of the diaphragm 30.
COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：即使扬声器外壳小，也可以增加和输出低频带。 解决方案：当扬声器10被激活时，扬声器10的锥纸的振动传播到扬声器外壳20中的空气中。隔膜30的振动区域30a被空气的振动振动。 此时，振动板30在通过边缘40保持气密的同时振动的同时，在扬声器壳体20振动时，压缩或解压缩扬声器壳体20内的风量。 因此，除了隔膜30的弹性和隔膜30的等效质量之外，还增加扬声器外壳20的空气弹簧的顺应性之间的另一共振频率。结果，产生围绕 隔膜30的共振频率。（C）2007，JPO＆INPIT

公开(公告)号：JP2006180049A

公开(公告)日：2006-07-06

申请号：JP2004369332

申请日：2004-12-21

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： KANO MASAYA ,  NORO MASAO

IPC: H03F1/52 ,  H03F3/217

CPC classification number: H03F3/217 ,  H03F1/52 ,  H03F2200/351

Abstract: PROBLEM TO BE SOLVED: To provide a digital amplifier capable of carrying out optimum protective operations in matching with a balance between a load current and a raw power of the amplifier.
SOLUTION: A threshold value adjustment circuit 8 for adjusting a prescribed threshold value is provided on a pre-stage of a protection circuit 6 for starting the protection operations when a load current flowing through a MOSFET QH exceeds the prescribed threshold value. The threshold value adjustment circuit 8 receives a voltage proportional to a drain current Id produced across a current sensing resistor Rd inserted between a positive power supply +V and the MOSFET QH at its high-side and an output of an output voltage detection circuit 7 for detecting a voltage amplitude of an analog signal from a low pass filter 4 for demodulating an output of a class D amplifier stage 3, adopts a limiting current of the MOSFET QH for the threshold value when an output voltage is greater, or adjusts the threshold value so that the protection circuit 6 starts the protection operation at a current lower than the limiting current when the output voltage is small.
COPYRIGHT: (C)2006,JPO&NCIPI

Abstract translation: 要解决的问题：提供一种数字放大器，其能够执行与放大器的负载电流和原始功率之间的平衡匹配的最佳保护操作。 解决方案：当流过MOSFET QH的负载电流超过规定阈值时，用于调节规定阈值的阈值调整电路8设置在保护电路6的前级，用于启动保护操作。 阈值调整电路8接收与在正电源+ V之间插入的电流感测电阻器Rd和其高侧的MOSFET QH之间产生的漏极电流Id成比例的电压和输出电压检测电路7的输出 检测来自用于解调D类放大器级3的输出的低通滤波器4的模拟信号的电压幅度，当输出电压较大时采用MOSFET QH的限制电流作为阈值，或者调整阈值 使得当输出电压小时，保护电路6以低于限制电流的电流开始保护操作。 版权所有（C）2006，JPO＆NCIPI

公开(公告)号：JP2004072276A

公开(公告)日：2004-03-04

申请号：JP2002226628

申请日：2002-08-02

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： TANAKA TAISHIN ,  NORO MASAO

IPC: H03K17/687 ,  H03F3/217 ,  H03F3/30

CPC classification number: H03F3/2171

Abstract: PROBLEM TO BE SOLVED: To provide a D-class amplifier which can control driving of an output power MOS transistor without using special circuit technology and electronic parts.
SOLUTION: A complementary signal generation circuit 301 generates first complementary signals (S1 and S2) from a PWM signal. A signal conversion circuit 302 converts the first complementary signals into second complementary signals (S3, S4 or S5 and S6) having a voltage component where a negative power source VPP- is set to be a reference. The signals S3 and S4 in the second complementary signals are supplied to a driving circuit 305, and the signals S5 and S6 are supplied to a current driving circuit 303. The current driving circuit 303 outputs third complementary signals (H3 and H4) having current components toward the negative power source VPP- in response to the signals S5 and S6 to a driving circuit 304. Thus, the driving circuits 304 and 305 complementarily drive power MOS transistors 401 and 402.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2004064673A

公开(公告)日：2004-02-26

申请号：JP2002223606

申请日：2002-07-31

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： TANAKA TAISHIN ,  NORO MASAO

IPC: H04R3/00 ,  H03F1/52 ,  H03F3/185 ,  H03F3/187 ,  H03F3/217 ,  H03F3/393 ,  H03K17/08 ,  H03K17/695

CPC classification number: H03F3/2171 ,  H03F3/185 ,  H03F3/393

Abstract: PROBLEM TO BE SOLVED: To provide a class D amplifier wherein both power MOS transistors constituting the output stage can be controlled to an off state when an excess output current is generated.
SOLUTION: Detecting circuits (REFH, CM11, LA1, TN1, RN1) which detect an excess current flowing in the power MOS transistor 401 of the output stage and output a first signal (ITN1) are arranged in a first driving circuit 303H of a high side driver side. Detecting circuits (REFL, CM21, LA2, TN2, RN2) which detect an excess current flowing in the power MOS transistor 402 of the output stage and output a second signal (ITN2) are arranged in a driving circuit 303L of a low side driver side. The first signal (ITN1) is converted to a third signal (ITT2) wherein a negative power source VPP- is made a reference by using a signal conversion circuit. The third signal is added to the second signal. In response to the added signal, a pulse signal to be input in the driving circuits 303H, 303L is obstructed.
COPYRIGHT: (C)2004,JPO

公开(公告)号：JP2003264435A

公开(公告)日：2003-09-19

申请号：JP2002061107

申请日：2002-03-06

Applicant: YAMAHA CORP

Inventor： TANAKA TAISHIN ,  NORO MASAO

IPC: H03F3/217

Abstract: PROBLEM TO BE SOLVED: To provide a D-class amplifier capable of driving and controlling power MOS (metal oxide semiconductor) transistors for output without using a particular circuit technology and electronic components. SOLUTION: A signal generation circuit 301H generates and outputs a common mode signal H1 and an opposite phase signal H2 of a modulated pulse signal. A signal conversion circuit 302H converts the common mode signal H1 and the opposite phase signal H2 into a common mode signal H3 and an opposite phase signal H4 following the voltage VR1 making source voltage VS of the MOS transistor 401 for output a reference while maintaining size relation between a signal level of the common-mode signal H1 and a signal level of the opposite phase signal H2. Then, a driving circuit 303H is activated by an internal power source P12 making the source voltage VS a reference and drives the MOS transistor 401 for output based on the size relation between the common-mode signal H3 and the opposite phase signal H4. Similarly, a MOS transistor 402 for output is complementarily driven for the MOS transistor 401. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003169132A

公开(公告)日：2003-06-13

申请号：JP2001367641

申请日：2001-11-30

Applicant: YAMAHA CORP

Inventor： NORO MASAO ,  TODA AKIHIKO

IPC: A63F13/42 ,  A63F13/73 ,  A63F13/825 ,  H04M1/67 ,  H04W88/02 ,  A63F13/00 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To provide a portable telephone set in which an illegal use can be prevented while having fun. SOLUTION: A portable telephone set K is provided with an operation means 4 in which an entry meaning the care of a pet in a pet raising game is enabled, a game proceeding means for proceeding with the pet raising game corresponding to the entry from this operation means 4, a display means 5 in which the proceeding status of the pet raising game can be displayed, and a telephone function stop means for stopping the telephone function of the portable telephone set K on the condition that the pet raising game is turned into a prescribed state. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2003047086A

公开(公告)日：2003-02-14

申请号：JP2001232429

申请日：2001-07-31

Applicant: Yamaha Corp ,  ヤマハ株式会社

Inventor： NORO MASAO

IPC: H04R3/00 ,  H03F1/42 ,  H03F3/21 ,  H03F3/213 ,  H04M1/00 ,  H04M1/60 ,  H04M1/725 ,  H04R3/04

CPC classification number: H03F3/213

Abstract: PROBLEM TO BE SOLVED: To reduce a capacitance of an output coupling capacitor of an amplifier.
SOLUTION: An input signal from a signal source 10 is applied to a + terminal of the amplifier 20 through an input coupling capacitor CIN. An output signal of the amplifier 20 is applied to a headphone 30 through the output coupling capacitor C
1 , and negatively fed back via a first negative feedback circuit having resistors R
2 , R
1 and a capacitor CNF. A second negative feedback circuit having a capacitor C
2 and a resistor R
3 is provided between an output side of the capacitor C
1 and one terminal of the amplifier 20. As the capacitor C
2 , a capacitor having a sufficiently smaller capacitance than that of the capacitor C
1 is used, and hence the capacitance of the capacitor C
1 can be reduced as compared with a prior art. Further, characteristics obtained by combining the frequency characteristics of the second negative feedback circuit and the frequency characteristics of a conventional circuit, and the frequency characteristics in a low-frequency region can be raised.
COPYRIGHT: (C)2003,JPO

Abstract translation: 要解决的问题：减小放大器的输出耦合电容的电容。 解决方案：来自信号源10的输入信号通过输入耦合电容器CIN施加到放大器20的+端。 放大器20的输出信号通过输出耦合电容器C1施加到耳机30，并通过具有电阻器R2，R1和电容器CNF的第一负反馈电路负反馈。 具有电容器C2和电阻器R3的第二负反馈电路设置在电容器C1的输出侧和放大器20的一个端子之间。作为电容器C2，具有比电容器C1的电容充分小的电容的电容器 因此与现有技术相比，电容器C1的电容可以减小。 此外，可以提高通过组合第二负反馈电路的频率特性和常规电路的频率特性所获得的特性以及低频区域中的频率特性。