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公开(公告)号：SG77115A1
公开(公告)日：2000-12-19
申请号：SG1996009757
申请日：1996-05-07
Applicant: YAMAHA CORP
Inventor： NORO MASAO
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公开(公告)号：DE69223477T2
公开(公告)日：1998-07-09
申请号：DE69223477
申请日：1992-09-24
Applicant: YAMAHA CORP
Inventor： NORO MASAO
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公开(公告)号：HK1053622A1
公开(公告)日：2003-10-31
申请号：HK03106052
申请日：2003-08-22
Applicant: YAMAHA CORP
Inventor： NORO MASAO , TANAKA TAKAHIRO , TOBA NOBUKAZU , YAMAKI KIYOSHI
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.
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公开(公告)号：DE10104572A1
公开(公告)日：2001-09-20
申请号：DE10104572
申请日：2001-02-01
Applicant: YAMAHA CORP
Inventor： MORISHIMA MORITO , HONDA KAZUHIKO , NORO MASAO , TSUJI NOBUAKI
IPC: G11B7/0045 , G11B7/125 , G11B7/0037
Abstract: The square-wave signal modification device is designed as part of a system providing improved and faster recording of information on optical discs or other recording mediums and includes a write (record) device having a record section in the vicinity of a recording medium. A flexible signal transmission path section is connected to the record section and forms a feature of HF-signal components damping. A square wave signal transmission medium is provided in the main surface element section in order to supply a first square wave signal at the end of the signal transmission path section, and a wave form modification medium receives a second square wave signal for the other end of the signal transmission path section and modifies its waveform so that a level of the waveform is lifted for a given first time period at a time point in the vicinity of a rise of the second square wave signal.
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公开(公告)号：DE69224409D1
公开(公告)日：1998-03-19
申请号：DE69224409
申请日：1992-06-18
Applicant: YAMAHA CORP
Inventor： NORO MASAO
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.
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Patent Agency Ranking
公开(公告)号：SG43213A1
公开(公告)日：1997-10-17
申请号：SG1996005652
申请日：1992-06-10
Applicant: YAMAHA CORP
Inventor： NORO MASAO
Abstract: A power supply circuit of a switching inverter type includes a switching circuit (2) including two switching elements capable of being alternately on-off controlled for converting an input from a dc power source into ac by switching of the switching elements and outputting it, a dc output circuit (3) for full-wave rectifying and smoothing a supplied ac input to provide a dc output,a series resonance circuit (4) provided in series to current flowing from the output terminal of the switching circuit, a parallel resonance circuit (5) provided in parallel to voltage produced at the output terminal of the switching circuit, and a switching control circuit (6) for intermittently turning on the switching elements of the switching circuit. A dc output is taken out of resonance current of the series resonance circuit by the dc output circuit and potential at the output terminal of the switching circuit is converted from one potential to another by using parallel resonance voltage of the parallel resonance circuit, whereby all switching operations of the switching elements are performed substantially at a voltage zero state or substantially at a current zero state and harmonic contents in operation voltage and operation current in the circuit are reduced.
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公开(公告)号：DE68919535T2
公开(公告)日：1995-07-06
申请号：DE68919535
申请日：1989-05-19
Applicant: YAMAHA CORP
Inventor： NAGI KATSUO , NORO MASAO , FURUKAWA KAZUNARI
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公开(公告)号：DE60032499T2
公开(公告)日：2007-10-11
申请号：DE60032499
申请日：2000-10-23
Applicant: YAMAHA CORP
Inventor： NORO MASAO , TANAKA TAKAHIRO , TOBA NOBUKAZU , YAMAKI KIYOSHI
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.
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公开(公告)号：DE60032499D1
公开(公告)日：2007-02-01
申请号：DE60032499
申请日：2000-10-23
Applicant: YAMAHA CORP
Inventor： NORO MASAO , TANAKA TAKAHIRO , TOBA NOBUKAZU , YAMAKI KIYOSHI
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.
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公开(公告)号：HK1051265A1
公开(公告)日：2003-07-25
申请号：HK03103281
申请日：2003-05-10
Applicant: YAMAHA CORP
Inventor： NORO MASAO , TODA AKIHIKO
Abstract: There is provided a D/A converter that is free from a variation in the voltage width of 1 LSB between more significant bits and less significant bits of data for conversion due to variations in characteristics of resistors, transistors, etc. to thereby ensure a higher conversion accuracy than the conventional D/A converter. The eight more significant bits of 12-bit data for conversion are applied to a decoder 21, while the four less significant bits of the same are applied to a current addition circuit 22. The decoder 21 selects one of FET's F0 to F255 based on the eight more significant bits to cause one of voltages divided by a series circuit formed by resistors r0 to r255 to be applied to an operational amplifier 40. On the other hand, switches 30 to 33 of the current addition circuit 22 are switched, respectively, by the four less significant bits to turn respective FET's 35 to 38 on and off. As a result, currents flowing through turned-on ones of the FET's 35 to 38 are synthesized to flow through the resistor ra so that a voltage is generated across the resistor ra. The operational amplifier 40 synthesizes the two voltages and then outputs the synthesized voltage. An FET 24 and each of the FET's 35 to 38 form a current mirror circuit, whereby the influence of variations in characteristics of the resistors, etc. is eliminated.
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