Patents by Inventor Akihisa Kawamura

Akihisa Kawamura 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: 20180279039
    Abstract: A speaker device includes a first speaker unit, a first cabinet that houses the first speaker unit, an annular portion defining a sound path that guides sound radiated from the first speaker unit to outside the first cabinet, the annular portion being positioned on a sound radiation side of the first speaker unit and arranged so as to sound a diaphragm in the first speaker unit, a second cabinet arranged inside the annular portion and spaced apart from the sound path, the sound path being tubular, a second speaker unit that radiates sound in a direction in which the first speaker unit radiates sound and that is stored in the second cabinet, and a resonant portion having an aperture communicating with the sound path and defining a resonant space.
    Type: Application
    Filed: February 22, 2018
    Publication date: September 27, 2018
    Inventors: TOSHIYUKI MATSUMURA, AKIHISA KAWAMURA, SHUJI SAIKI
  • Publication number: 20180249243
    Abstract: A loudspeaker device includes: a plurality of loudspeaker units; and a plurality of horns provided in the plurality of loudspeaker units, respectively, the plurality of horns each restricting spread of sound output from a corresponding one of the loudspeaker units to a predetermined range.
    Type: Application
    Filed: August 8, 2016
    Publication date: August 30, 2018
    Inventors: KAZUKI HONDA, TAKAFUMI YUASA, AKIHISA KAWAMURA, TOSHIYUKI MATSUMURA, SHUJI SAIKI, SATOSHI TAKAYAMA, SUEMEI FUKUHARA, ISAO KURAMITSU, IPPEI KIYAMA
  • Publication number: 20180242061
    Abstract: A loudspeaker device includes: a loudspeaker housing; a first loudspeaker unit provided in a first wall of the loudspeaker housing; and an acoustic tube communicating an inside and an outside of the loudspeaker housing to each other. The acoustic tube has a predetermined length, and is accommodated in the loudspeaker housing while spirally bent.
    Type: Application
    Filed: August 8, 2016
    Publication date: August 23, 2018
    Inventors: KAZUKI HONDA, TAKAFUMI YUASA, AKIHISA KAWAMURA, TOSHIYUKI MATSUMURA, SHUJI SAIKI, SATOSHI TAKAYAMA, SUEMEI FUKUHARA, ISAO KURAMITSU, IPPEI KIYAMA
  • Patent number: 9820047
    Abstract: A method is provided for causing a processor included in a speaker system to execute operations. The operations include acquiring, using a measurement microphone, reflected sound information regarding an effect of sounds that are played back by a plurality of speakers having predetermined directivity and that are reflected off an object, where the plurality of speakers are included in the speaker system. The operations also include calculating correction coefficients used to correct acoustic characteristics of the plurality of speakers on the basis of the acquired reflected sound information. The operations further include correcting the acoustic characteristics of the plurality of speakers using the calculated correction coefficients.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: November 14, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Akihisa Kawamura, Toshiyuki Matsumura, Isao Kakuhari, Shuji Saiki, Satoshi Takayama, Kazuki Honda, Takafumi Yuasa
  • Patent number: 9774935
    Abstract: A speaker device for reproducing an audio signal includes a first speaker including a first diaphragm and a first magnetic circuit that drives the first diaphragm, where the first diaphragm reproduces an audio signal including a predetermined frequency range, a second speaker including a second diaphragm and a second magnetic circuit that drives the second diaphragm, where the second diaphragm reproduces an audio signal including a frequency range substantially the same as the predetermined frequency range, and at least one cabinet having the first speaker and the second speaker mounted therein so that radiation directions of sounds are opposite to each other. At least part of a space formed between the first speaker and the second speaker communicates with the outside of the cabinet. When the speaker device reproduces the audio signal, the first diaphragm and the second diaphragm vibrate in opposite directions.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: September 26, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Toshiyuki Matsumura, Akihisa Kawamura, Kazuki Honda, Takafumi Yuasa, Shuji Saiki, Satoshi Takayama
  • Publication number: 20170064448
    Abstract: A method causing a processor included in a speaker system to execute operations includes acquiring, using a measurement microphone, reflected sound information regarding an effect of sounds that are played back by a plurality of speakers having predetermined directivity and that are reflected off an object, where the plurality of speakers are included in the speaker system, calculating correction coefficients used to correct acoustic characteristics of the plurality of speakers on the basis of the acquired reflected sound information, and correcting the acoustic characteristics of the plurality of speakers using the calculated correction coefficients.
    Type: Application
    Filed: August 25, 2016
    Publication date: March 2, 2017
    Inventors: AKIHISA KAWAMURA, TOSHIYUKI MATSUMURA, ISAO KAKUHARI, SHUJI SAIKI, SATOSHI TAKAYAMA, KAZUKI HONDA, TAKAFUMI YUASA
  • Publication number: 20170064421
    Abstract: A speaker device for reproducing an audio signal includes a first speaker including a first diaphragm and a first magnetic circuit that drives the first diaphragm, where the first diaphragm reproduces an audio signal including a predetermined frequency range, a second speaker including a second diaphragm and a second magnetic circuit that drives the second diaphragm, where the second diaphragm reproduces an audio signal including a frequency range substantially the same as the predetermined frequency range, and at least one cabinet having the first speaker and the second speaker mounted therein so that radiation directions of sounds are opposite to each other. At least part of a space formed between the first speaker and the second speaker communicates with the outside of the cabinet. When the speaker device reproduces the audio signal, the first diaphragm and the second diaphragm vibrate in opposite directions.
    Type: Application
    Filed: August 25, 2016
    Publication date: March 2, 2017
    Inventors: TOSHIYUKI MATSUMURA, AKIHISA KAWAMURA, KAZUKI HONDA, TAKAFUMI YUASA, SHUJI SAIKI, SATOSHI TAKAYAMA
  • Patent number: 8284961
    Abstract: A signal processing device includes a generation unit that generates a second signal from a first signal that is obtained by down mixing two signals; a mixing coefficient determination unit that determines, based on a value L and a value ?, a mixing degree for mixing the first signal and the second signal; and a mixing unit that mixes the first signal and the second signal based on the mixing degree determined by the mixing coefficient determination unit. The generation unit includes a first filter that generates a low frequency band signal in the second signal, from a low frequency band signal in the first signal; and a second filter that generates a high frequency band signal in the second signal, from a high frequency band signal in the first signal. The first filter is a filter unit which, for a complex-number signal, de-correlates an input signal and adds a reverberation component by using a delay unit and an all pass filter, and the processing unit is a filter unit different from the first filter.
    Type: Grant
    Filed: July 10, 2006
    Date of Patent: October 9, 2012
    Assignee: Panasonic Corporation
    Inventors: Shuji Miyasaka, Yosiaki Takagi, Takeshi Norimatsu, Akihisa Kawamura, Kojiro Ono
  • Patent number: 8184817
    Abstract: Provided is a multi-channel acoustic signal processing device by which loads of arithmetic operations are reduced. The multi-channel acoustic signal processing device includes: a decorrelated signal generation unit, and a matrix operation unit and a third arithmetic unit. The decorrelated signal generation unit generates a decorrelated signal w? indicating a sound which includes a sound indicated by an input signal x and reverberation, by performing reverberation processing on the input signal x. The matrix operation unit and the third arithmetic unit generate audio signals of m channels, by performing arithmetic operation on the input signal x and the decorrelated signal w? generated by the decorrelated signal generation unit, using a matrix R3 which indicates distribution of a signal intensity level and distribution of reverberation.
    Type: Grant
    Filed: July 7, 2006
    Date of Patent: May 22, 2012
    Assignee: Panasonic Corporation
    Inventors: Yoshiaki Takagi, Kok Seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono
  • Patent number: 8160890
    Abstract: It possible not only to reduce a delay, but also to enhance the coding efficiency and reduce audio artifact upon coding.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: April 17, 2012
    Assignee: Panasonic Corporation
    Inventors: Mineo Tsushima, Akihisa Kawamura
  • Patent number: 8081764
    Abstract: Provided is an audio decoder which can reduce an amount of arithmetic operations while suppressing occurrence of aliasing noise. The audio decoder includes: a decoder (102) and an analysis filter bank (110) which generate, from a coded down-mixed signal, the first frequency band signal (x) corresponding to a down-mixed signal (M); a channel expansion unit (130) which converts the first frequency band signal (x) generated by the analysis filter bank (110) into output signals (y) corresponding to respective audio signals of N channels, using BC information; an synthesis filter bank (140) which performs band synthesis for the output signals (y) generate by the channel expansion unit (130) and thereby converts the output signals (y) into the respective audio signals of the N channels on a time axis; and an aliasing noise detection unit (120) which detects occurrence of aliasing noise in the first frequency band signal (x).
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: December 20, 2011
    Assignee: Panasonic Corporation
    Inventors: Yosiaki Takagi, Kok seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono
  • Patent number: 8073703
    Abstract: To provide an acoustic signal processing apparatus which can reduce the amount of calculation in matrix arithmetic. An acoustic signal processing apparatus converts down-mixed acoustic signals of NI channels to acoustic signals of NO channels, where NO>NI.
    Type: Grant
    Filed: October 3, 2006
    Date of Patent: December 6, 2011
    Assignee: Panasonic Corporation
    Inventors: Shuji Miyasaka, Yoshiaki Takagi, Takeshi Norimatsu, Akihisa Kawamura, Kojiro Ono, Kok Seng Chong
  • Patent number: 8019614
    Abstract: A temporal processing apparatus includes: a splitter splitting an audio signal, included in the sub-band domain, into diffuse signals indicating reverberating components and direct signals indicating non-reverberating components; a downmix unit generating a downmix signal by downmixing the direct signals; BPFs respectively generating a bandpass downmix signal and bandpass diffuse signals; normalization processing units respectively generating a normalized downmix signal and normalized diffuse signals; a scale computation processing unit computing, on a predetermined time slot basis, a scale factor indicating the magnitude of energy of the normalized downmix signal with respect to energy of the normalized diffuse signals; a calculating unit generating scale diffuse signals; a HPF generating high-pass diffuse signals; an adding unit generating addition signals; and a synthesis filter bank performing synthesis filter processing on the addition signals and transforming the addition signals into the time domains.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: September 13, 2011
    Assignee: Panasonic Corporation
    Inventors: Yoshiaki Takagi, Kok Seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono, Tomokazu Ishikawa
  • Patent number: 7917237
    Abstract: A sending apparatus includes a compressed music data outputting unit that outputs one of compressed music data including compressed basic music data in a first mode and compressed music data including the basic music data as well as high frequency information for extending high frequency of the basic music data in a second mode, and a formatter that transmits a compressed music data outputted by the compressed music data outputting unit first and then music information including a value indicating which mode is used for the compressed music data.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: March 29, 2011
    Assignee: Panasonic Corporation
    Inventors: Akihisa Kawamura, Naoki Esima
  • Patent number: 7844355
    Abstract: A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data is provided. The stream playback device includes a decoder and an interface unit operable to receive the audio stream supplied from a stream supply device. The stream playback device notifies the stream supply device whether only the base data or both the base data and the extension data are usable in decoding of the audio stream by the decoder, through the interface unit.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: November 30, 2010
    Assignee: Panasonic Corporation
    Inventors: Hiroshi Yahata, Tomoyuki Okada, Akihisa Kawamura
  • Publication number: 20100292820
    Abstract: A stream playback device for playing back an audio stream including audio frames which are each made up of base data and extension data is provided. The stream playback device includes a decoder and an interface unit operable to receive the audio stream supplied from a stream supply device. The stream playback device notifies the stream supply device whether only the base data or both the base data and the extension data are usable in decoding of the audio stream by the decoder, through the interface unit.
    Type: Application
    Filed: July 28, 2010
    Publication date: November 18, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: HIROSHI YAHATA, TOMOYUKI OKADA, AKIHISA KAWAMURA
  • Publication number: 20100235171
    Abstract: Provided is an audio decoder which can reduce an amount of arithmetic operations while suppressing occurrence of aliasing noise. The audio decoder includes: a decoder (102) and an analysis filter bank (110) which generate, from a coded down-mixed signal, the first frequency band signal (x) corresponding to a down-mixed signal (M); a channel expansion unit (130) which converts the first frequency band signal (x) generated by the analysis filter bank (110) into output signals (y) corresponding to respective audio signals of N channels, using BC information; an synthesis filter bank (140) which performs band synthesis for the output signals (y) generate by the channel expansion unit (130) and thereby converts the output signals (y) into the respective audio signals of the N channels on a time axis; and an aliasing noise detection unit (120) which detects occurrence of aliasing noise in the first frequency band signal (x).
    Type: Application
    Filed: July 11, 2006
    Publication date: September 16, 2010
    Inventors: Yosiaki Takagi, Kok Seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono
  • Patent number: 7714934
    Abstract: Digital audio data which have a predetermined packet structure are divided into units including a predetermined number of bits; each unit of the divided digital audio data is converted into specific data to be encoded; the encoded data are arranged in blanking intervals of video data; the digital audio data are transmitted as well as the video data using a transmission line for the video data, and the video data and the audio data may be simultaneously and favorably transmitted, adopting an existing video-data transmission format such as the DVI standard.
    Type: Grant
    Filed: July 19, 2006
    Date of Patent: May 11, 2010
    Assignees: Sony Corporation, Panasonic Corporation
    Inventors: Naoki Ejima, Toshiroh Nishio, Akihisa Kawamura, Hidekazu Suzuki, Sho Murakoshi, Tetsuya Hiroe, Hiroshige Okamoto
  • Publication number: 20100042415
    Abstract: It possible not only to reduce a delay, but also to enhance the coding efficiency and reduce audio artifact upon coding.
    Type: Application
    Filed: December 5, 2007
    Publication date: February 18, 2010
    Inventors: Mineo Tsushima, Akihisa Kawamura
  • Publication number: 20090262949
    Abstract: Provided is a multi-channel acoustic signal processing device by which loads of arithmetic operations are reduced. The multi-channel acoustic signal processing device (100) includes: a decorrelated signal generation unit (181), and a matrix operation unit (187) and a third arithmetic unit (186). The decorrelated signal generation unit (181) generates a decorrelated signal w? indicating a sound which includes a sound indicated by an input signal x and reverberation, by performing reverberation processing on the input signal x. The matrix operation unit (187) and the third arithmetic unit (186) generate audio signals of m channels, by performing arithmetic operation on the input signal x and the decorrelated signal w? generated by the decorrelated signal generation unit (181), using a matrix R3 which indicates distribution of a signal intensity level and distribution of reverberation.
    Type: Application
    Filed: July 7, 2006
    Publication date: October 22, 2009
    Inventors: Yoshiaki Takagi, Kok Seng Chong, Takeshi Norimatsu, Shuji Miyasaka, Akihisa Kawamura, Kojiro Ono