Patents by Inventor Shigeo Tagami

Shigeo Tagami 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).

  • Digital signal processing device, a method and a delta-sigma modulator using the same method
    Patent number: 7450648
    Abstract: A signal processing device uses a ?? modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the ?? modulator. The signal processing device prevents noise during switchover by shifting to a low order just before the ?? modulator is bypassed if this occurs. The present invention provides a digital signal processing device which can switch between an original sound signal and a ?? modulation signal and yield a sufficient S/N ratio for a reprocessed ?? modulation signal. If any 1-bit original sound signal is input, little switching noise is generated.
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: November 11, 2008
    Assignee: Sony Corporation
    Inventor: Shigeo Tagami
  • Digital signal processing device and a method and a ?-? sigma modulator using the same method
    Patent number: 6990152
    Abstract: A signal processing device uses a ?? modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the ?? modulator. The signal processing device prevents noise during switchover by shifting to a low order just before the ?? modulator is bypassed if this occurs. The present invention provides a digital signal processing device which can switch between an original sound signal and a ?? modulation signal and yield a sufficient S/N ratio for a reprocessed ?? modulation signal. If any 1-bit original sound signal is input, little switching noise is generated.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: January 24, 2006
    Assignee: Sony Corporation
    Inventor: Shigeo Tagami
  • Digital signal processing device, a method and a delta-sigma modulator using the same method
    Publication number: 20050162887
    Abstract: A signal processing device uses a ?? modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the ?? modulator. The signal processing device prevents noise during switchover by shifting to a low order just before the ?? modulator is bypassed if this occurs. The present invention provides a digital signal processing device which can switch between an original sound signal and a ?? modulation signal and yield a sufficient S/N ratio for a reprocessed ?? modulation signal. If any 1-bit original sound signal is input, little switching noise is generated.
    Type: Application
    Filed: March 21, 2005
    Publication date: July 28, 2005
    Inventor: Shigeo Tagami
  • Digital signal processing device and a method and a delta-sigma modulator using the same method
    Publication number: 20010016012
    Abstract: A signal processing device uses a &Dgr;&Sgr; modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the &Dgr;&Sgr; modulator. The signal processing device prevents a noise during switchover by shifting to a low order just before the &Dgr;&Sgr; modulator is bypassed if this occurs. The present invention provides a digital signal processing device which can switch between an original sound signal and a &Dgr;&Sgr; modulation signal, and yield a sufficient S/N ratio for a reprocessed &Dgr;&Sgr; modulation signal. If any 1-bit original sound signal is input, little switching noise is generated.
    Type: Application
    Filed: February 14, 2001
    Publication date: August 23, 2001
    Applicant: Sony Corporation.
    Inventor: Shigeo Tagami
  • Mute signal processing circuit for one-bit digital signal
    Patent number: 5889483
    Abstract: A signal processing device wherein an incoming one-bit digital audio signal is blocked by every predetermined bit-length block. Two consecutive blocked frames are compared and it is judged whether or not an integral value of each frame is a predetermined value. If a portion where coincidence between the frames and coincidence of the integral value continue for a predetermined period of time, mute processing is performed.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: March 30, 1999
    Assignee: Sony Corporation
    Inventors: Shigeo Tagami, Masaharu Yanari
  • Word length convertor
    Patent number: 5877716
    Abstract: In a digital-data processing unit provided by the present invention, the level of 1-bit digital audio data resulting from DELTA-SIGMA modulation is adjusted by means of a multiplier. A digital audio data signal with the level thereof adjusted then undergoes DELTA-SIGMA modulation carried out by a low-pass DELTA-SIGMA modulator. As a result, digital audio signal with the word length thereof restored to its original value is obtained. In this case, high-frequency noise included in the digital audio data is removed.
    Type: Grant
    Filed: March 6, 1997
    Date of Patent: March 2, 1999
    Assignee: Sony Corporation
    Inventor: Shigeo Tagami