Patents by Inventor Toyokazu Hama

Toyokazu Hama 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).

  • Voice processing method and voice processing device
    Patent number: 7127399
    Abstract: In a voice communication system 1, a gateway server 4 receives IP packets from the Internet, converts PCM voice data in the IP packets into AMR encoded voice data frames, and transmits to a mobile terminal 7. During the propagation to the gateway server 4, there is a possibility of loss of IP packets and crucial bit error in IP packets. In that case, the gateway server 4 puts “No data” data on frames as voice encoded data for the IP packets in question and sends it to the mobile terminal 7. The “No data” data is a target of concealment.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: October 24, 2006
    Assignee: NTT DoCoMo, Inc.
    Inventors: Toyokazu Hama, Nobuhiko Naka
  • Voice processing method and voice processing device
    Publication number: 20020013696
    Abstract: In a voice communication system 1, a gateway server 4 receives IP packets from the Internet, converts PCM voice data in the IP packets into AMR encoded voice data frames, and transmits to a mobile terminal 7. During the propagation to the gateway server 4, there is a possibility of loss of IP packets and crucial bit error in IP packets. In that case, the gateway server 4 puts “No data” data on frames as voice encoded data for the IP packets in question and sends it to the mobile terminal 7. The “No data” data is a target of concealment.
    Type: Application
    Filed: May 18, 2001
    Publication date: January 31, 2002
    Inventors: Toyokazu Hama, Nobuhiko Naka