公开(公告)号：US20200351587A1

公开(公告)日：2020-11-05

申请号：US16932034

申请日：2020-07-17

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： H04R3/12 ,  H03F3/183 ,  H04R3/04 ,  H04R1/40 ,  H04R27/00 ,  G08B3/10

摘要： A speaker controller includes a switch that is inserted on a speaker wiring for supplying a sound signal to a speaker. A switch control circuit can extract and hold an ON/OFF control signal for instructing ON/OFF of the switch from an alternating-current signal supplied via the speaker wiring. A switch control circuit controls ON/OFF of the switch based on the ON/OFF control signal. A power supply circuit can generate a power supply voltage for operating the switch control circuit from the alternating-current signal supplied via the speaker wiring.

公开(公告)号：US20170085979A1

公开(公告)日：2017-03-23

申请号：US15310522

申请日：2015-05-14

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： H04R1/24 ,  H04R7/26 ,  H04R9/06 ,  H04R9/02 ,  H04R7/12 ,  H04R7/18

CPC分类号： H04R1/24 ,  H04R1/26 ,  H04R1/265 ,  H04R7/12 ,  H04R7/127 ,  H04R7/18 ,  H04R7/20 ,  H04R7/26 ,  H04R9/025 ,  H04R9/04 ,  H04R9/06 ,  H04R31/003

摘要： An electroacoustic transducer includes: a diaphragm including a cone portion having a conical shape such as a circular conical surface shape or an oval conical surface shape, and a wing-pair portion having a pair of longitudinal split tubular surfaces arranged next to each other, a valley being formed between a side portion of one of the longitudinal split tubular surfaces and a side portion of the other of the longitudinal split tubular surfaces; a converter that performs conversion between vibration of the diaphragm along an axis of the cone portion and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm such that the diaphragm is movable in an axial direction of the cone portion. The small-diameter-side end portion of the cone portion, and a bottom portion of a valley of the wing-pair portion are secured to the converter.

公开(公告)号：US20240056038A1

公开(公告)日：2024-02-15

申请号：US18449526

申请日：2023-08-14

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： H03F3/21

CPC分类号： H03F3/211 ,  H03F2200/03

摘要： A power amplifier includes a first amplifier configured to amplify an input signal and output, from a first output, a first signal in which the input signal is amplified, a second amplifier configured to amplify the first signal and output, from a second output, a second signal in which the first signal is amplified, a third amplifier configured to amplify the second signal and output, from a third output, a third signal in which the second signal is amplified, a capacitor connected between the first output and a mixing node, a first resistor connected between the second output and the mixing node, a first inductor connected between the third output and the mixing node, a second inductor connected between the mixing node and a load, and a feedback circuit configured to negatively feed back a mixed signal of the mixing node to an input of the first amplifier.

公开(公告)号：US20220312107A1

公开(公告)日：2022-09-29

申请号：US17701129

申请日：2022-03-22

申请人： YAMAHA CORPORATION

发明人： Masao NORO

IPC分类号： H04R1/26 ,  H04R9/02 ,  H04R9/08 ,  H04R9/04 ,  H04R1/04 ,  H04R3/00 ,  H04R7/12

摘要： A signal converter includes a chamber, a first diaphragm, a second diaphragm, and a first converter. The chamber has a first opening at one end and a second opening at a second end opposite the first end. The first diaphragm is disposed so as to cover the first opening. The second diaphragm is disposed so as to cover the second opening. The first converter is disposed in the chamber and configured to generate a first signal based on a vibration of the first diaphragm.

公开(公告)号：US20170215007A1

公开(公告)日：2017-07-27

申请号：US15329596

申请日：2015-07-27

申请人： Yamaha Corporation

发明人： Masao NORO

IPC分类号： H04R7/12 ,  H04R7/16 ,  H04R9/06

CPC分类号： H04R7/122 ,  H04R1/22 ,  H04R1/323 ,  H04R7/14 ,  H04R7/16 ,  H04R9/06 ,  H04R17/00 ,  H04R31/003 ,  H04R2231/001 ,  H04R2307/025

摘要： An electroacoustic transducer includes: a diaphragm having two pairs of longitudinal split tubular surfaces; a converter that performs conversion between vibration of the diaphragm and an electric signal; and a supporter supporting the diaphragm. The two pairs of longitudinal split tubular surfaces form valleys and ridge portions. In each pair of the two pairs of longitudinal split tubular surfaces, one-side portions of the respective longitudinal split tubular surfaces form a valley. Another-side portion of the split tubular surface of each one of the two pairs and an other-side portion of the split tubular surface of the other of the two pairs form a ridge portion. The two pairs of longitudinal split tubular surfaces are arranged in at least one of a state in which the valleys are orthogonal to each other and a state in which the ridge portions are orthogonal to each other.

公开(公告)号：US20160020735A1

公开(公告)日：2016-01-21

申请号：US14802412

申请日：2015-07-17

申请人： Yamaha Corporation

发明人： Yohei OTANI ,  Masao NORO

IPC分类号： H03F1/34 ,  H03F3/217 ,  H03F3/185

CPC分类号： H03F1/342 ,  H03F3/185 ,  H03F3/2171 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/144 ,  H03F2200/153 ,  H03F2200/171 ,  H03F2200/301 ,  H03F2200/351 ,  H03F2200/391 ,  H03F2200/462 ,  H03F2200/546 ,  H03F2200/78 ,  H03F2203/45521 ,  H03F2203/45522 ,  H03F2203/45526 ,  H03F2203/45528

摘要： A power amplifier includes a class D amplification section and a load current feedback circuit. The class D amplification section includes an input section and a switching section serving as an output stage and switched depending on a signal input to the input section, and outputs current from a power source to a load via the switching section. The load current feedback circuit negatively feeds back the current flowing in the load to the input section of the class D amplification section.

摘要翻译： 功率放大器包括D类放大部分和负载电流反馈电路。 D类放大部分包括输入部分和用作输出级的开关部分，并根据输入到输入部分的信号进行切换，并经由切换部分从电源向负载输出电流。 负载电流反馈电路将负载中流过的电流反馈给D类放大部分的输入部分。

公开(公告)号：US20230421962A1

公开(公告)日：2023-12-28

申请号：US18463366

申请日：2023-09-08

申请人： YAMAHA CORPORATION

发明人： Takahiro TERADA ,  Yukio WAKUI ,  Tsunenori SANO ,  Masao NORO

IPC分类号： H04R9/02 ,  H01F7/08

CPC分类号： H04R9/025 ,  H01F7/081

摘要： An object of the present invention is to provide a magnetic circuit for an acoustic transducer, the magnetic circuit enabling peeling of the surface of a member formed by compression-molding a soft magnetic composite material to be suppressed. The present invention is a magnetic circuit for an acoustic transducer, the magnetic circuit including: a yoke 151; a magnet 152; and a top plate 153, wherein the yoke 151 includes a bottom surface portion 151a and a pole piece 151b provided perpendicular to the bottom surface portion 151a, the magnet 152 and the top plate 153 are provided in that order on the bottom surface portion 151a, a magnetic gap 141 in which a voice coil 14 is disposed is formed between the pole piece 151b and the top plate 153, at least one of the pole piece 151b and the top plate 153 includes: a composite material part 154 in a position facing the magnetic gap 141; and a protective layer 155 covering at least a surface of the composite material part 154, the composite material part 154 is formed from a soft magnetic composite material, and the material of the protective layer 155 differs from the soft magnetic composite material.

公开(公告)号：US20230261619A1

公开(公告)日：2023-08-17

申请号：US18126751

申请日：2023-03-27

申请人： Yamaha Corporation

发明人： Shinya MIZOSHIRI ,  Masao NORO

IPC分类号： H03F3/217

CPC分类号： H03F3/217 ,  H03F2200/351

摘要： A class-D amplifier that amplifies an input signal comprises a control circuit configured to generate a control signal that varies in accordance with a level of the input signal, a first generating circuit configured to generate a first pulse, and a second generating circuit configured to generate a second pulse. A pulse width of the first pulse becomes narrower as the signal level of the input signal becomes smaller, and the pulse width of the first pulse becomes wider as an instantaneous magnitude of the input signal becomes larger. A pulse width of the second pulse becomes narrower as the signal level of the input signal becomes smaller, and the pulse width of the second pulse becomes wider as an instantaneous magnitude of the input signal becomes smaller.

公开(公告)号：US20230017817A1

公开(公告)日：2023-01-19

申请号：US17945751

申请日：2022-09-15

申请人： Yamaha Corporation

发明人： Yohei OHTANI ,  Masao NORO

IPC分类号： H03F3/217 ,  H04R3/00 ,  H03F1/34

摘要： An acoustic apparatus includes a class-D amplifier including a current feedback circuit, and a speaker system including a voice coil driven by the class-D amplifier. The speaker system is configured such that, in a case where the speaker system is driven by an ordinary amplifier having a first output resistance lower than a second output impedance of the class-D amplifier, a Q factor of the speaker system falls below a predetermined lower limit of an ordinary Q factor range of an ordinary speaker system. The current feedback circuit is configured to increase the second output impedance of the class-D amplifier by feeding a current flowing to the voice coil back to an input of the class-D amplifier so as to increase a Q factor as the acoustic apparatus higher than the predetermined lower limit of the ordinary Q factor range and within the ordinary Q factor range.

公开(公告)号：US20230007383A1

公开(公告)日：2023-01-05

申请号：US17939363

申请日：2022-09-07

申请人： YAMAHA CORPORATION

发明人： Yuu TSUCHIHASHI ,  Yoshikazu HONJI ,  Masao NORO

IPC分类号： H04R1/10 ,  H04R3/04

摘要： A headphone includes: a housing; a first driver unit disposed in the housing; a partition wall dividing an internal space of the housing into a first space and a second space, the first space containing the first driver unit; a second driver unit attached to the partition wall; and an acoustic adjustment circuit configured to receive a first signal to be input to the first driver unit and generate a second signal to be input to the second driver unit based on the first signal.