Patents by Inventor Hiroshi Saruwatari

Hiroshi Saruwatari 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).

  • Patent number: 9946054
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a rear lens group including a lens unit having negative refractive power arranged along an optical axis thereof. A focal length fw of the zoom lens at a wide-angle end, a focal length ft of the zoom lens at a telephoto end, an amount of movement M1 of the first lens unit on the optical axis in zooming from the wide-angle end to the telephoto end, and a focal length frn of a lens unit Lrn that is a lens unit having a shortest focal length among lens units having negative refractive power included in the rear lens group are appropriately set based on predetermined mathematical conditions.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: April 17, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toyokatsu Fujisaki, Hiroshi Saruwatari
  • Publication number: 20160033748
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a rear lens group including a lens unit having negative refractive power arranged along an optical axis thereof. A focal length fw of the zoom lens at a wide-angle end, a focal length ft of the zoom lens at a telephoto end, an amount of movement M1 of the first lens unit on the optical axis in zooming from the wide-angle end to the telephoto end, and a focal length frn of a lens unit Lrn that is a lens unit having a shortest focal length among lens units having negative refractive power included in the rear lens group are appropriately set based on predetermined mathematical conditions.
    Type: Application
    Filed: July 31, 2015
    Publication date: February 4, 2016
    Inventors: Toyokatsu Fujisaki, Hiroshi Saruwatari
  • Patent number: 9019610
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. In the zoom lens, each lens unit moves to perform zooming. In addition, an amount of movement Mm of the fourth lens unit when zooming from a wide angle end to an intermediate zooming position, an amount of movement Mt of the fourth lens unit when zooming from the wide angle end to a telephoto end, a focal length fw of an entire system at the wide angle end, and focal lengths f3 and f4 of the respective third lens unit and fourth lens unit are properly set.
    Type: Grant
    Filed: January 6, 2010
    Date of Patent: April 28, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Patent number: 8976228
    Abstract: A zoom lens includes, in order from an object side to an image side, a positive first lens unit, a negative second lens unit, a positive third lens unit, and a positive fourth lens unit. During zooming from a wide-angle end to a telephoto end, the first lens unit moves with a locus convex toward the image side, and the third lens unit moves toward the object side. The first lens unit includes, in order from the object side to the image side, a negative first lens, a positive second lens, and a positive third lens. A distance (d12) between the first lens and the second lens, a focal length (fw) of the entire zoom lens at the wide-angle end, and a refractive index (Np) of a positive lens having the lowest refractive index among the refractive indices of materials of all positive lenses included in the first lens unit are appropriately set based on predetermined mathematical conditions.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: March 10, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Patent number: 8488806
    Abstract: A separation signal generation unit generates a plurality of separation signals which are independent from one another from the mixed signals for one frame which are converted into those in a frequency region. A mask processing unit judges a noise condition of a first separation signal for each frequency bin on the basis of the first separation signal and second separation signals. The mask processing unit further removes a first noise component obtained on the basis of a judgment result on the noise condition from the first separation signal. A noise amount measuring unit measures the amount of noise in the first separation signal. A noise signal selection unit selects a noise signal for each frequency bin on the basis of the amount of noise measured by the noise amount measuring unit. A noise removing unit removes a second noise component from a noise removal signal inputted from the mask processing unit.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: July 16, 2013
    Assignee: National University Corporation Nara Institute of Science and Technology
    Inventors: Hiroshi Saruwatari, Eiji Baba, Hiromitsu Mori
  • Publication number: 20130010968
    Abstract: In a sound processing apparatus, a matrix factorization unit acquires a non-negative first basis matrix including a plurality of basis vectors that represent spectra of sound components of a first sound source, and acquires an observation matrix that represents time series of a spectrum of a sound signal corresponding to a mixed sound of the first sound source and a second sound source different from the first sound source. The matrix factorization unit generates a first coefficient matrix, a second basis matrix and a second coefficient matrix from the observation matrix by non-negative matrix factorization using the first basis matrix. A sound generation unit generates either of a sound signal according to the first basis matrix and the first coefficient matrix or a sound signal according to the second basis matrix and the second coefficient matrix.
    Type: Application
    Filed: July 6, 2012
    Publication date: January 10, 2013
    Applicant: YAMAHA CORPORATION
    Inventors: Kosuke YAGI, Hiroshi SARUWATARI, Yu TAKAHASHI
  • Patent number: 8218243
    Abstract: Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, all the lens units moving during zooming; and a secondary aperture having a constant aperture diameter disposed on the image side of the second lens unit, in which the second lens unit includes lens components having a positive refractive powers disposed at a position closest to the object side and a position closest to the image side, and a distance (dd) on an optical axis between a lens surface closest to the image side in the second lens unit and the secondary aperture, and a focal length (fw) of the entire zoom lens at a wide angle end are appropriately set.
    Type: Grant
    Filed: November 4, 2010
    Date of Patent: July 10, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Publication number: 20120134508
    Abstract: An audio processing apparatus generates a suppression coefficient sequence that is composed of coefficient values corresponding to frequency components of an audio signal, the frequency components being multiplied by the corresponding coefficient values to suppress noise components of the audio signal. In the audio processing apparatus, a characteristic value calculation unit calculates a noise characteristic value depending on a shape of a magnitude distribution of the audio signal. An intensity setting unit variably sets a suppression intensity of the noise components based on the noise characteristic value. A coefficient sequence generation unit generates the suppression coefficient sequence based on the audio signal and the suppression intensity.
    Type: Application
    Filed: November 23, 2011
    Publication date: May 31, 2012
    Applicants: Nara Institute of Science and Technology National University Corporation, YAMAHA CORPORATION
    Inventors: Takayuki Inoue, Hiroshi Saruwatari, Kazunobu Kondo
  • Publication number: 20120013995
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Each lens unit and the aperture stop move during zooming. In zooming from a wide angle end to a telephoto end, an amount of movement of the aperture stop Mp is set to a suitable amount.
    Type: Application
    Filed: January 6, 2010
    Publication date: January 19, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Hiroshi Saruwatari
  • Publication number: 20110273774
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. In the zoom lens, each lens unit moves to perform zooming. In addition, an amount of movement Mm of the fourth lens unit when zooming from a wide angle end to an intermediate zooming position, an amount of movement Mt of the fourth lens unit when zooming from the wide angle end to a telephoto end, a focal length fw of an entire system at the wide angle end, and focal lengths f3 and f4 of the respective third lens unit and fourth lens unit are properly set.
    Type: Application
    Filed: January 6, 2010
    Publication date: November 10, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Hiroshi Saruwatari
  • Publication number: 20110211711
    Abstract: In a noise suppression apparatus, an index setter sets an exponent K that is a positive value. A factor setter variably sets a suppression factor according to the exponent K. A noise suppressor generates an audio signal from which a noise component is suppressed through noise suppression process of suppressing a Kth power of an amplitude of the noise component at each frequency thereof in a Kth power of an amplitude of the audio signal at each frequency thereof to a degree determined according to the suppression factor set by the factor setting part. Preferably, the index setter sets the exponent K to a value less than 0.1.
    Type: Application
    Filed: February 25, 2011
    Publication date: September 1, 2011
    Inventors: Takayuki Inoue, Yu Takahashi, Hiroshi Saruwatari, Kazunobu Kondo
  • Publication number: 20110115946
    Abstract: Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, all the lens units moving during zooming; and a secondary aperture having a constant aperture diameter disposed on the image side of the second lens unit, in which the second lens unit includes lens components having a positive refractive powers disposed at a position closest to the object side and a position closest to the image side, and a distance (dd) on an optical axis between a lens surface closest to the image side in the second lens unit and the secondary aperture, and a focal length (fw) of the entire zoom lens at a wide angle end are appropriately set.
    Type: Application
    Filed: November 4, 2010
    Publication date: May 19, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Hiroshi Saruwatari
  • Patent number: 7864444
    Abstract: Provided is a zoom lens having a high magnification and excellent optical performance over an entire zoom range between a wide-angle end and a telephoto end. The zoom lens includes, in order from object side to image side: a first lens unit having positive refractive power; a second lens unit having negative refractive power; a third lens unit having positive refractive power; and a fourth lens unit having positive refractive power, and performs zooming while the respective lens units move, in which: during zooming from wide-angle end to telephoto end, the first unit moves closer to object side at telephoto end than at wide-angle end and the fourth unit moves along a locus convex to object side; and a focal length of the second unit, a focal length of the zoom lens at wide-angle end, and an imaging magnification of the fourth unit at telephoto end are appropriately set.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: January 4, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Publication number: 20100296665
    Abstract: A In a noise suppression apparatus, an extractor extracts a noise component from an audio signal. A stationary noise estimator estimates stationary noise included in the noise component. A first noise suppressor removes a spectrum of the stationary noise from a spectrum of the audio signal to an extent determined by a subtraction factor. A non-stationary noise estimator estimates a spectrum of non-stationary noise by subtracting the spectrum of the stationary noise from the spectrum of the noise component. A factor setter generates a filtering factor for emphasizing a target sound component contained in the audio signal from the spectrum of the non-stationary noise. A second noise suppressor performs a filtering process using the filtering factor on the audio signal after processing of the first noise suppressor.
    Type: Application
    Filed: May 18, 2010
    Publication date: November 25, 2010
    Applicants: Nara Institute of Science and Technology National University Corporation, Yamaha Corporation
    Inventors: Yohei ISHIKAWA, Yu Takahashi, Hiroshi Saruwatari, Kazunobu Kondo
  • Patent number: 7777951
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. The zoom lens performs zooming by moving each of the lens units. The first lens unit and the third lens unit are positioned closer to the object at a telephoto end than at a wide-angle end. The zoom lens satisfies the following conditions: 0.3<|m1/m2|<1.5 0.3<|m3/m2|<0.8 where m1, m2, and m3 are the amounts of movement of the first lens unit, the second lens unit, and the third lens unit, respectively, along an optical axis during zooming from the wide-angle end to the telephoto end.
    Type: Grant
    Filed: May 22, 2009
    Date of Patent: August 17, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Publication number: 20100128897
    Abstract: A separation signal generation unit generates a plurality of separation signals which are independent from one another from the mixed signals for one frame which are converted into those in a frequency region. A mask processing unit judges a noise condition of a first separation signal for each frequency bin on the basis of the first separation signal and second separation signals. The mask processing unit further removes a first noise component obtained on the basis of a judgment result on the noise condition from the first separation signal. A noise amount measuring unit measures the amount of noise in the first separation signal. A noise signal selection unit selects a noise signal for each frequency bin on the basis of the amount of noise measured by the noise amount measuring unit. A noise removing unit removes a second noise component from a noise removal signal inputted from the mask processing unit.
    Type: Application
    Filed: March 26, 2008
    Publication date: May 27, 2010
    Applicant: Nat. Univ. Corp. Nara Inst. of Sci. and Tech.
    Inventors: Hiroshi Saruwatari, Yoshimitsu Mori, Hiromitsu Mori, Eiji Baba
  • Publication number: 20100008520
    Abstract: A noise suppression estimation device calculates a noise index value which varies according to kurtosis of a frequence distribution of magnitude of a sound signal before or after suppression of the noise component, the noise index value indicating a degree of occurrence of musical noise after suppression of the noise component in a frequency domain. For example, the noise suppression estimation device calculates first kurtosis of a frequence distribution of magnitude of the sound signal before suppression of the noise component, calculates second kurtosis of a frequence distribution of magnitude of the sound signal after suppression of the noise component, and calculates the noise index value from the first kurtosis and the second kurtosis.
    Type: Application
    Filed: July 8, 2009
    Publication date: January 14, 2010
    Applicants: Yamaha Corporation, Nara Institute of Science and Technology National University Corporation
    Inventors: Hiroshi SARUWATARI, Yoshihisa Uemura, Kazunobu Kondo
  • Publication number: 20090306973
    Abstract: A sound source separation apparatus, includes: a plurality of sound input means into which a plurality of mixed sound signals in which sound source signals from a plurality of sound sources superimpose each other are input; first sound source separating means for separating and extracting SIMO signals corresponding to at least one sound source signal from the plurality of mixed sound signals by means of a sound source separation process of a blind source separation system based on an independent component analysis method; intermediate processing executing means for obtaining a plurality of intermediately processed signals by carrying out a predetermined intermediate processing including one of a selection process and a synthesizing process to a plurality of specified signals which is at least a part of the SIMO signals, for each of frequency components divided into a plurality; and second sound source separating means for obtaining separation signals corresponding to the sound source signals by applying a bin
    Type: Application
    Filed: January 23, 2007
    Publication date: December 10, 2009
    Inventors: Takashi Hiekata, Takashi Morita, Hiroshi Saruwatari, Yoshimitsu Mori
  • Patent number: 7630141
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power and configured to move along an optical axis during zooming, a second lens unit having a negative refractive power and configured to move with a locus convex towards the image side during zooming, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power. The first lens unit is located closer to the object side at a telephoto end than at a wide-angle end and the second lens unit is located closer to the image side at the telephoto end than at the wide-angle end. A focal length of the second lens unit (f2), a focal length of the zoom lens at the wide-angle end (fw), and a focal length of the zoom lens at the telephoto end (ft) are appropriately set.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: December 8, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroshi Saruwatari
  • Publication number: 20090251797
    Abstract: Provided is a zoom lens having a high magnification and excellent optical performance over an entire zoom range between a wide-angle end and a telephoto end. The zoom lens includes, in order from object side to image side: a first lens unit having positive refractive power; a second lens unit having negative refractive power; a third lens unit having positive refractive power; and a fourth lens unit having positive refractive power, and performs zooming while the respective lens units move, in which: during zooming from wide-angle end to telephoto end, the first unit moves closer to object side at telephoto end than at wide-angle end and the fourth unit moves along a locus convex to object side; and a focal length of the second unit, a focal length of the zoom lens at wide-angle end, and an imaging magnification of the fourth unit at telephoto end are appropriately set.
    Type: Application
    Filed: April 8, 2009
    Publication date: October 8, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Hiroshi Saruwatari