Patents by Inventor Yoshihisa Nakato

Yoshihisa Nakato 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).

  • AUDIO SIGNAL CODING METHOD, DECODING METHOD, AUDIO SIGNAL CODING APPARATUS, AND DECODING APPARATUS WHERE FIRST VECTOR QUANTIZATION IS PERFORMED ON A SIGNAL AND SECOND VECTOR QUANTIZATION IS PERFORMED ON AN ERROR COMPONENT RESULTING FROM THE FIRST VECTOR QUANTIZATION
    Patent number: 6826526
    Abstract: A coding unit codes an audio signal by using a vector quantization method to reduce the quantity of data. An audio code having a minimum distance among auditive distances between sub-vectors produced by dividing an input vector and audio codes in a transmission-side code book is selected. A portion corresponding to an element of a sub-vector having a high auditive importance is handled in an audio code selecting unit while neglecting the codes indicating phase information and subjected to comparative retrieval with respect to audio codes in a transmission-side code book. Extracted phase information corresponding to an element portion of the sub-vector is added to the result obtained and output as a code index. Thereby, the calculation amount in the code retrieval of vector quantization and the number of codes in the code book are decreased without lowering the quality of an audio signal.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: November 30, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takeshi Norimatsu, Shuji Miyasaka, Yoshihisa Nakato, Mineo Tsushima, Tomokazu Ishikawa