公开(公告)号：US20220270580A1

公开(公告)日：2022-08-25

申请号：US17743616

申请日：2022-05-13

申请人： YAMAHA CORPORATION

发明人： Jun ISHII ,  Masao NORO

IPC分类号： G10H1/34

摘要： An input device includes a first operating element and a first sensor. The first sensor includes a first conductor, a first coil, and a first magnetic material forming an open magnetic circuit together with the first coil. A positional relationship between the first coil and the first magnetic material is fixed. A first distance between a first end portion of the first magnetic material and the first conductor varies according to the amount of operation on the first operating element. The first sensor outputs a first signal corresponding to the first distance.

公开(公告)号：US20220224293A1

公开(公告)日：2022-07-14

申请号：US17705626

申请日：2022-03-28

申请人： YAMAHA CORPORATION

发明人： Shinya MIZOSHIRI ,  Masao NORO

IPC分类号： H03F3/217 ,  H03F1/32

摘要： A class-D amplifier includes: a gain control unit that amplifies an input audio signal in accordance with a compensation gain to generate an input signal Vin; and a pulse width modulator that generates a first pulse Vp whose pulse width changes according to the input signal Vin within a first input range A1 where a value of the generated input signal Vin is higher than a first boundary Vb1, and that generates a second pulse Vn whose pulse width changes according to the generated input signal Vin within a second input range A2. The gain control unit controls the compensation gain so that first inclination of an input/output characteristic of the class-D amplifier in a first section in which the pulse width modulator outputs both the first pulse Vp and the second pulse Vn and second inclination of the input/output characteristic in a second section other than the first section are similar to each other.

公开(公告)号：US20220103932A1

公开(公告)日：2022-03-31

申请号：US17447539

申请日：2021-09-13

申请人： YAMAHA CORPORATION

发明人： Takeshi DAISHOJI ,  Masao NORO

IPC分类号： H04R1/28 ,  H04R3/00

摘要： Provided is a speaker apparatus including a first speaker having a first surface communicating with an interior and a second surface not communicating with the interior; a second speaker having a first surface communicating with an exterior and a second surface not communicating with the exterior; and a cabinet having boundary surfaces that form an enclosed space. The second surface of the first speaker and the second surface of the second speaker are arranged on the boundary surfaces and are facing the enclosed space.

公开(公告)号：US20210409872A1

公开(公告)日：2021-12-30

申请号：US17474385

申请日：2021-09-14

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： H04R19/01 ,  B06B1/02

摘要： An electroacoustic transducer includes a first fixed electrode, a second fixed electrode, and a vibration body. The first and second fixed electrodes face each other across a space. The first fixed electrode includes first protrusions that are provided on a first electrode surface of the first fixed electrode and that protrude toward the second fixed electrode. The first protrusions are arranged at a first arrangement density that varies depending on a position of the first protrusions on the first electrode surface. The second fixed electrode includes second protrusions that are provided on a second electrode surface of the second fixed electrode and that protrude toward the first fixed electrode. The second protrusions are arranged at a second arrangement density that varies depending on a position of the second protrusions on the second electrode surface. The vibration body is sandwiched between the first protrusions and the second protrusions.

公开(公告)号：US20190248008A1

公开(公告)日：2019-08-15

申请号：US16395408

申请日：2019-04-26

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： B25J9/16 ,  G05B19/416 ,  B25J9/12

CPC分类号： B25J9/1633 ,  B25J9/123 ,  B25J19/00 ,  G05B19/416 ,  G05B2219/37333 ,  G05D3/12 ,  H02P25/034 ,  H03K17/6871

摘要： Provided is a driving control apparatus that can control relaxation of force in an actuator. The driving control apparatus is provided with: a driving control unit configured to control driving of the actuator according to a driving control signal; and a pressure control unit configured to control, according to a pressure control signal, involvement of the driving control signal in control of pressure to be generated by the actuator.

公开(公告)号：US20220216835A1

公开(公告)日：2022-07-07

申请号：US17706038

申请日：2022-03-28

申请人： YAMAHA CORPORATION

发明人： Shinya MIZOSHIRI ,  Masao NORO

IPC分类号： H03F3/217 ,  H03K7/08

摘要： Pulse width modulators 131P and 131N respectively generate a first pulse Vp whose pulse width changes according to an input signal Vin based on the input signal Vin and a generated first carrier wave C1P, and a second pulse Vn whose pulse width changes according to the input signal Vin based on the input signal Vin and a generated second carrier wave C1N. Wherein due to the non-liner gradient in each of the generated first carrier wave C1P and the generated second carrier wave C1N and, duty ratio of each of the generated first pulse Vp and the generated second pulse Vn is less than 50% in a state where a value of the input signal is zero; and a difference between a pulse width of the first pulse Vp and a pulse width of the second pulse Vn linearly changes according to the input signal Vin.

公开(公告)号：US20190222182A1

公开(公告)日：2019-07-18

申请号：US16363300

申请日：2019-03-25

申请人： Yamaha Corporation

发明人： Takeshi TOGAWA ,  Masao NORO

IPC分类号： H03F3/217

CPC分类号： H03F3/217 ,  H03F2200/03 ,  H03F2200/171 ,  H03F2200/333 ,  H03F2200/351

摘要： A class D amplifier includes a self-oscillating class D amplification circuit that is driven by an output current signal; and a voltage-current converting circuit that outputs an output current signal in response to an input signal voltage and an output signal voltage from a feedback signal voltage.

公开(公告)号：US20170279422A1

公开(公告)日：2017-09-28

申请号：US15468440

申请日：2017-03-24

申请人： YAMAHA CORPORATION

发明人： Takeshi TOGAWA ,  Masao NORO

IPC分类号： H03F3/217 ,  H03F3/185

CPC分类号： H03F3/2173 ,  H03F1/32 ,  H03F3/181 ,  H03F3/185 ,  H03F3/217 ,  H03F3/2171 ,  H03F2200/03 ,  H03F2200/171 ,  H03F2200/351 ,  H03F2200/78

摘要： A Bridge-Tied Load output self-oscillating class D amplifier includes a comparator receives an input signal from a signal input circuit at a second input terminal and outputs a positive-phase pulse width modulation signal and a reverse-phase pulse width modulation signal by comparing voltages of the two input terminal, first and second switching circuits power-amplifies the reverse-phase pulse width modulation signal and the positive-phase pulse width modulation signal, a first low-pass filter extracts a first output signal from the reverse-phase pulse width modulation signal, a second low-pass filter extracts a second output signal from the positive-phase pulse width modulation signal, a subtractor calculates a difference between the first and second output signals and output a difference signal, and a first feedback circuit feeds back the difference signal to the second input terminal of the comparator.

公开(公告)号：US20170279421A1

公开(公告)日：2017-09-28

申请号：US15468329

申请日：2017-03-24

申请人： YAMAHA CORPORATION

发明人： Takeshi TOGAWA ,  Masao NORO

IPC分类号： H03F3/217 ,  H03F3/185

CPC分类号： H03F3/2171 ,  H03F3/185 ,  H03F3/217 ,  H03F3/2173 ,  H03F2200/03 ,  H03F2200/171 ,  H03F2200/351 ,  H03F2200/78

摘要： A self-oscillating class D amplifier includes an integration circuit configured to integrate an input signal and output a result of the integration as an integrated signal, a comparator configured to receive the integrated signal at an inverting input terminal and output a pulse width modulation signal by comparing voltages of a non-inverting input terminal being grounded and the inverting input terminal, a switching circuit configured to power-amplify the pulse width modulation signal output from the comparator, a low-pass filter configured to extract an amplified output signal from the power-amplified pulse width modulation signal, a first feedback circuit configured to feed back the output signal of the low-pass filter to the inverting input terminal of the comparator, and a second feedback circuit configured to feed back the output signal of the low-pass filter to the integration circuit.

公开(公告)号：US20160268986A1

公开(公告)日：2016-09-15

申请号：US15067550

申请日：2016-03-11

申请人： YAMAHA CORPORATION

发明人： Yohei OTANI ,  Masao NORO

IPC分类号： H03F5/00

CPC分类号： H03F5/00 ,  H03F1/3264 ,  H03F1/327 ,  H03F3/217 ,  H03F2200/549 ,  H04R3/00

摘要： A power amplifier includes a class-D amplifier and an input signal supplier. The class-D amplifier includes an input portion and a switching device. The switching device is switched according to an input signal that is input to the input portion so that a current is supplied to a load from a power source via the switching device. The input signal supplier supplies the input signal to the input portion of the class-D amplifier, calculates a virtual output voltage to be output from a virtual power source having a prescribed internal impedance characteristic when a current to flow through the load is output from the virtual power source, and adjust an amplitude of the input signal according to the virtual output voltage.

摘要翻译： 功率放大器包括D类放大器和输入信号供应器。 D类放大器包括输入部分和开关装置。 开关装置根据输入到输入部分的输入信号进行切换，使得电流经由开关装置从电源提供给负载。 输入信号供给器将输入信号提供给D类放大器的输入部分，当从该D型放大器输出的电流流过负载时，计算出从具有规定的内部阻抗特性的虚拟电源输出的虚拟输出电压 虚拟电源，并根据虚拟输出电压调整输入信号的幅度。