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    Digital- to- analog converter.
    31.
    发明专利
    Digital- to- analog converter. 未知

    公开(公告)号：HK1051266A1

    公开(公告)日：2003-07-25

    申请号：HK03103310

    申请日：2003-05-13

    Applicant: YAMAHA CORP

    Inventor： TODA AKIHIKO ,  MAEJIMA TOSHIO ,  NORO MASAO

    IPC: H03M1/68 ,  H03M1/74 ,  H03M1/76 ,  H03M

    Abstract: A resistor string D/A converter for converting input data to multiple-bit data without increasing the number of resistors. The higher four bits of input data to be converted are supplied to a decoder (1) while the lower four bits are applied to a decoder (3) through an inverter (2). The decoder (1) decodes the higher four bits and turns on one of FETs (F0-F15) based on the decoded result. As a result, one of the voltages at the nodes between series resistors (r0-r15) is selected and applied to an operational amplifier (6). Similarly, the voltage corresponding to the lower four bits of the data is applied to an operational amplifier (7). The output from the operational amplifier (7) is divided by 16 through resistors (ra, rb), and the resulting voltage is combined with the voltage applied to the operational amplifier (6) to produce an analog voltage corresponding to the input data.

    Device for driving vibration source
    32.
    发明专利
    Device for driving vibration source 未知

    公开(公告)号：AU7954300A

    公开(公告)日：2001-04-30

    申请号：AU7954300

    申请日：2000-10-23

    Applicant: YAMAHA CORP

    Inventor： NORO MASAO ,  TANAKA TAKAHIRO ,  TOBA NOBUKAZU ,  YAMAKI KIYOSHI

    IPC: H04R1/00 ,  B06B1/02 ,  B06B1/04 ,  G08B6/00 ,  H04M1/00

    Abstract: A vibration source driving device comprises a sound source 10 for generating musical tone signals, a DC motor 24 as a vibration source for generating vibration, a low-pass filter (LPF) 16 as a signal extraction means for extracting low-frequency components from the musical tone signals output from the sound source 10, a detection circuit 18 for detecting the output signal of the low-pass filter 16, a rectifier circuit 20 for rectifying the detection output of the detection circuit 18, and an amplifier for driving the vibration source based on the low-frequency components of the musical tone signals that are extracted by the low-pass filter 16.

    34.
    发明专利
    未知

    公开(公告)号：DE69224409T2

    公开(公告)日：1998-09-17

    申请号：DE69224409

    申请日：1992-06-18

    Applicant: YAMAHA CORP

    Inventor： NORO MASAO

    IPC: H03F1/02 ,  H03F3/20

    Abstract: An amplification circuit for power amplification of an audio signal or other signal includes a main power source line (42) for supplying a driving power to a load, a switching element (Qs) inserted in the main power source line for turning on and off the main power line, a smoothing circuit (L1) inserted in the main power line for smoothing an output of the switching element, a switching control circuit for switching the switching element with a variable on-off ratio in accordance with the level of an input signal, an auxiliary power source line (48) capable of responding to change in the level of the input signal at a higher speed than the main power line to supply power to the load, an auxiliary power supply amount adjusting element (Qb) inserted in the auxiliary power line to adjust the power supply amount from the auxiliary power source line to the load, and an auxiliary power supply amount control circiut for controlling the auxiliary power supply adjusting element to cause power corresponding to deficiency of power supply by the main power source line to be supplied from the auxiliary power source line. The amplification circuit is driven by a power voltage capable of supplying substantially a maximum output from the auxiliary power source line to the load regardless of magnitude of deficiency of the power supply amount to the load by the main power source line.

    DIGITAL-TO-ANALOG CONVERTER
    38.
    发明公开
    DIGITAL-TO-ANALOG CONVERTER 有权
    数字模拟转换器

    公开(公告)号：EP1235352A4

    公开(公告)日：2003-01-29

    申请号：EP00977872

    申请日：2000-11-22

    Applicant: YAMAHA CORP

    Inventor： NORO MASAO ,  TODA AKIHIKO

    IPC: H03M1/68 ,  H03M1/06 ,  H03M1/72 ,  H03M1/74 ,  H03M1/76

    CPC classification number: H03M1/0619 ,  H03M1/687 ,  H03M1/745 ,  H03M1/765

    Abstract: A decoder (21) selects one of FETs (F0 to F255) based on higher bits, and applies one of the voltages divided by a series circuit of resistors (r0 to r255) to an operational amplifier (40). Switches (30 to 33) of a current adder circuit (22) are switched by lower bits to turn on and off FETs (35 to 38). The currents flowing through the conducting FETs are combined, and the resulting current flows to a resistor (ra), across which a voltage appears. The operational amplifier (40) combines two input voltages to produce an output. A FET (24) and FETs (35 to 38) form a current mirror circuit, which prevents the voltage width of each LSB of higher and lower bits from changing if the current (i) through the series circuit of resistors (r0 to r255) changes because of irregularities of manufacturing processes.

    ELECTROACOUSTIC TRANSDUCER
    39.
    发明公开
    ELECTROACOUSTIC TRANSDUCER 审中-公开

    公开(公告)号：EP3177036A4

    公开(公告)日：2018-03-14

    申请号：EP15828298

    申请日：2015-07-27

    Applicant: YAMAHA CORP

    Inventor： NORO MASAO

    IPC: H04R7/12 ,  H04R1/22 ,  H04R1/32 ,  H04R7/14 ,  H04R7/16 ,  H04R9/06 ,  H04R17/00 ,  H04R31/00

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

    Abstract: A low-cost electroacoustic transducer with a single speaker unit is provided which exhibits a wide directivity over a wide frequency range from low frequencies to high frequencies. This electroacoustic transducer has substantially the same directivity even when the speaker unit is disposed in any orientation such as a vertical orientation or a horizontal orientation. The electroacoustic transducer includes: a diaphragm 1 having two pairs of longitudinal split tubular surfaces 5; a converter that performs conversion between vibration of the diaphragm 1 and an electric signal corresponding to the vibration; and a supporter that supports the diaphragm 1 such that the diaphragm 1 is movable in a vibration direction. The diaphragm 1 is configured such that the two pairs of longitudinal split tubular surfaces form valleys 6 and ridge portions 12. In each pair of the two pairs of longitudinal split tubular surfaces 5, one-side portions of the respective longitudinal split tubular surfaces 5 form a valley 6. An other-side portion of the split tubular surface 5 of each one of the two pairs and an other-side portion of the split tubular surface 5 of the other of the two pairs form a ridge portion 12. The two pairs of longitudinal split tubular surfaces 5 are arranged such that the valleys 6 are orthogonal to each other and/or such that the ridge portions 12 are orthogonal to each other.

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