Patents by Inventor Susumu Takumai

Susumu Takumai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080165979
    Abstract: There is provided a loudspeaker array device which has a large freedom of installation place and whose sound beam can easily be set by a user. A method for setting the sound beam of the loudspeaker array device is also provided. The loudspeaker array device (1) makes the sound beam formed by the audio signal limited to the band where the angle of the sound beam can be adjusted, sweep from 0 to 180 degrees in the front of the loudspeaker array (10) and the direct sound and the reflected sound of the sound beam are collected by a non-directional microphone (2). The collected sound data is analyzed to detect a peak equal to or above a threshold value. Symmetry of each peak is checked. When symmetry is present, the angle at which the peak has been detected is set as the angle for outputting the sound beam for each channel of the surround sound.
    Type: Application
    Filed: June 21, 2005
    Publication date: July 10, 2008
    Applicant: YAMAHA CORPORATION
    Inventor: Susumu Takumai
  • Publication number: 20080159545
    Abstract: A speaker array is provided which can increase the orientation when reproducing front channels of a surround sound, increase the density effect, improve the narrow directivity when reproducing a stereo sound and increase the selectivity in selecting reproduction methods which match setting environments. When reproducing a stereo sound by a speaker array for reproducing a surround sound by converting a sound into a beam of sound, the speaker array is divided into a sound reproducing region for an L system and a sound reproducing region for an R system at a central portion thereof. Then, each of the reproducing regions so divided is further divided in to bands. In addition, since a high frequency reproducing region has a high directivity and a strong orientation when the sound is attempted to be reproduced simultaneously by the plurality of speakers as is described above, a reproducing region is limited to part of the reproducing regions.
    Type: Application
    Filed: January 4, 2005
    Publication date: July 3, 2008
    Applicant: Yamaha Corporation
    Inventors: Susumu Takumai, Yusuke Konagai
  • Publication number: 20070230724
    Abstract: To provide an audio reproduction apparatus in which a general user inputs simple and easy settings so that audio beams of respective channels can be set. When an array speaker is installed in a room, the user inputs the shape of the room into the audio reproduction apparatus. Based on the shape of the room, the audio reproduction apparatus determines a beam control pattern indicating which directions audio signals of the channels should be formed respectively. The audio reproduction apparatus reads beam control data including delay times for forming the beams in the directions from a pattern memory, and automatically sets the beam control data in a DSP. Thus, only when the user inputs the shape of the room, the beams are controlled with a beam control pattern suitable to the room so that multi-channel audio can be reproduced optimally.
    Type: Application
    Filed: July 6, 2005
    Publication date: October 4, 2007
    Applicant: YAMAHA CORPORATION
    Inventors: Yusuke Konagai, Susumu Takumai
  • Publication number: 20070217621
    Abstract: In a system capable of outputting an audio signal as beams from an array speaker and performing multi-channel reproduction, a plurality of beam setting patterns (reproduction modes) are stored in the memory of a controller. The beam setting patterns include a single basic pattern and a plurality of deformed patterns that use the beam control data of the basic pattern. When the user specifies a reproduction mode via an interface, the beam setting pattern corresponding to the mode is read and set to the signal processor of each channel.
    Type: Application
    Filed: August 26, 2005
    Publication date: September 20, 2007
    Applicant: YAMAHA CORPORATION
    Inventor: Susumu Takumai
  • Publication number: 20070110268
    Abstract: An array speaker apparatus SParray includes a first radiation means for driving speaker units so that a first sound S1 of a main channel is radiated to a wall surface W1 on the left or right side of a listening position, and a second radiation means for driving the speaker units so that a second sound S2 the same as the first audio signal is radiated directly to the listening position.
    Type: Application
    Filed: November 19, 2004
    Publication date: May 17, 2007
    Inventors: Yusuke Konagai, Susumu Takumai
  • Publication number: 20070076905
    Abstract: An audio output apparatus has a measuring circuit which measures the levels of at least two sound signals, a sound level adjusting module (a sound level adjusting circuit and a gain control circuit) which adjusts a sound level so as to equal the levels of the sound signals based on the levels measured at the measuring circuit, and an array speaker unit (a delay circuit, a multiplier, an adder, an amplifier and a speaker unit) which emits sounds in accordance with the sound signals outputted from the sound level adjusting module in different directivities respectively.
    Type: Application
    Filed: December 24, 2004
    Publication date: April 5, 2007
    Applicant: Yamaha Corporation
    Inventors: Yusuke Konagai, Susumu Takumai
  • Patent number: 7145850
    Abstract: A phase difference detection circuit (270) and a gain adjusting circuit (280) are provided in an optical disc recording apparatus (200). When the phase difference detection circuit detects a phase difference between an ATIP synchronization signal and a recording synchronization signal, this phase difference detection circuit activates an internal counter (271). Then, when phase difference information including a result of a counting operation performed by the internal counter is outputted from the phase difference detection circuit to the gain adjusting circuit, the gain adjusting circuit suitably adjust the frequency division ratio of a (1/N)-frequency-divider (242) according to the received phase difference information. Thus, the phase of a recording clock signal to be supplied from a PLL circuit (240) to a data encoder (260) through a frequency divider (250) is controlled.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: December 5, 2006
    Assignee: Yamaha Corporation
    Inventors: Susumu Takumai, Yoshihiko Shiozaki
  • Publication number: 20060126878
    Abstract: A multi-channel audio system is constituted using at least one line array speaker unit, in which plural speakers are arrayed in line, wherein the same audio signal is supplied with a prescribed delay time to each of the speakers, thus forming plural sound beams. The plural sound beams are reflected on a wall surface and a ceiling of a room so as to form plural virtual sound sources surrounding a listening position, and emission directions and intensities of the sound beams are controlled so as to localize a phantom at a prescribed position based on the plural virtual sound sources. By appropriately arranging plural line array speaker units horizontally, vertically, and slantingly in such a way that each line array speaker unit forms sound beams distributed and spread in a sectorial form, it is possible to realize a surround audio system having a high degree of freedom with regard to setup positions for forming virtual sound sources.
    Type: Application
    Filed: February 6, 2006
    Publication date: June 15, 2006
    Applicant: Yamaha Corporation
    Inventors: Susumu Takumai, Akira Usui
  • Publication number: 20030081516
    Abstract: A phase difference detection circuit (270) and a gain adjusting circuit (280) are provided in an optical disc recording apparatus (200). When the phase difference detection circuit detects a phase difference between an ATIP synchronization signal and a recording synchronization signal, this phase difference detection circuit activates an internal counter (271). Then, when phase difference information including a result of a counting operation performed by the internal counter is outputted from the phase difference detection circuit to the gain adjusting circuit, the gain adjusting circuit suitably adjust the frequency division ratio of a (1/N)-frequency-divider (242) according to the received phase difference information. Thus, the phase of a recording clock signal to be supplied from a PLL circuit (240) to a data encoder (260) through a frequency divider (250) is controlled.
    Type: Application
    Filed: September 26, 2002
    Publication date: May 1, 2003
    Applicant: Yamaha Corporation
    Inventors: Susumu Takumai, Yoshihiko Shiozaki