Patents by Inventor Masato Akagi

Masato Akagi 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: 8065138
    Abstract: A speech processing apparatus includes a spectrum envelope extracting unit which extracts the spectrum envelope of an input speech signal, a spectrum envelope deforming unit which applies deformation to the spectrum envelope to generate a deformed spectrum envelope, a spectrum fine structure extracting unit which extracts the spectrum fine structure of the input speech signal, a deformed spectrum generating unit which generates a deformed spectrum by combining the deformed spectrum envelope with the spectrum fine structure, and a speech generating unit which generates an output speech signal on the basis of the deformed spectrum. This apparatus emits a disrupting sound based on the output speech signal to prevent a third party from eavesdropping on a conversation.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: November 22, 2011
    Assignees: Japan Advanced Institute of Science and Technology, Glory Ltd.
    Inventors: Masato Akagi, Rieko Futonagane, Yoshihiro Irie, Hisakazu Yanagiuchi, Yoshitane Tanaka
  • Publication number: 20080281588
    Abstract: A speech processing apparatus includes a spectrum envelope extracting unit which extracts the spectrum envelope of an input speech signal, a spectrum envelope deforming unit which applies deformation to the spectrum envelope to generate a deformed spectrum envelope, a spectrum fine structure extracting unit which extracts the spectrum fine structure of the input speech signal, a deformed spectrum generating unit which generates a deformed spectrum by combining the deformed spectrum envelope with the spectrum fine structure, and a speech generating unit which generates an output speech signal on the basis of the deformed spectrum. This apparatus emits a disrupting sound based on the output speech signal to prevent a third party from eavesdropping on a conversation.
    Type: Application
    Filed: August 31, 2007
    Publication date: November 13, 2008
    Applicants: JAPAN ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY, GLORY LTD.
    Inventors: Masato Akagi, Rieko Futonagane, Yoshihiro Irie, Hisakazu Yanagiuchi, Yoshitane Tanaka
  • Publication number: 20080159559
    Abstract: A post-filter includes a microphone array including at least two microphones to which a voice signal are input, a beam former which forms the voice signal input from the microphone array, a divider which divides a target sound containing noise input from the microphone array into at least two frequency bands at a predetermined frequency, a first filter which estimates the filter gain with the noise non-correlated between the microphones, a second filter which estimates a filter gain of one microphone of the microphone array or an average signal of the microphone array, an adder which adds the outputs from the first and second filters to each other, and a filter for reducing the noise based on the outputs from the adder and the beam former.
    Type: Application
    Filed: February 29, 2008
    Publication date: July 3, 2008
    Inventors: Masato Akagi, Junfeng Li, Masaaki Uechi, Kazuya Sasaki