Patents by Inventor Martin T. Karanja

Martin T. Karanja 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).

  • Method and apparatus for transmitting and receiving information in a time slot
    Patent number: 6487181
    Abstract: A communication device employs a method and apparatus for transmitting and receiving information in a time slot. When transmitting, the communication device generates user information symbols and positions the symbols in a first portion of the time slot. The first portion of the time slot occupies less time than the time slot. The communication device then transmits the user information symbols during the first portion of the time slot only. When receiving, a communication device decodes and then encodes a received time slot, presuming the received time slot is not a truncated time slot. The communication device determines an error metric for the encoded time slot and, based on the error metric, determines whether the encoded time slot is a truncated time slot. When the encoded time slot is a truncated time slot, the communication device processes the user information symbols in the received time slot.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: November 26, 2002
    Assignee: Motorola, Inc.
    Inventors: Christopher L. Johnson, Michael W. Loos, Mark R. Poulin, Chin P. Wong, Patrick J. Doran, Martin T. Karanja
  • Method and apparatus for reducing false ringback detection
    Patent number: 6154537
    Abstract: In a communication device, a decoded audio signal is evaluated by a detection function (112). Two portions of the decoded audio signal spectrum are evaluated, a ringback band (206), and the remaining band(s). The signal strength in the ringback band is measured against a preselected ringback energy threshold level and the non-ringback signal strength is measured against a voice energy threshold level. Only if the ringback energy is above the ringback energy threshold level and the non-ringback band energy is below the voice energy threshold level will a ringback filter be applied to the audio signal.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: November 28, 2000
    Assignee: Motorola, Inc.
    Inventors: Nader Rizq, Martin T. Karanja, Chin Pan Wong
  • Method for concealing a handover mute
    Patent number: 6148206
    Abstract: In a mobile communication system (400) where a handover results in a momentary interruption of a signal between the mobile communication device (402) and the fixed network equipment(404, 410), the effect of muted portion (306) of the signal can be reduced by storing a segment (308) of the signal that is received just prior to the occurrence of the handover, and re-using the stored segment by attenuating the segment, playing the segment, and repeating the attenuating and playing (208, 210) until the handover is complete.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: November 14, 2000
    Assignee: Motorola, Inc.
    Inventors: Martin T. Karanja, Nader Rizq, Scott D. Gleason