Patents Assigned to P.T. Hartono Istana Electronics
  • Kapok loudspeaker enclosure damping material
    Patent number: 6338395
    Abstract: A damping material for use in a loudspeaker enclosure to enhance sonic properties of the enclosure. The material for use in the enclosure is kapok, a fibrous material with a relatively low density. By incorporating the kapok within the enclosure, either standing alone or in combination with other materials known to function as acoustic dampers, the overall result is that the sonic quality of the speaker system is increased and may also be reduced in size without sonic compromise.
    Type: Grant
    Filed: September 29, 1999
    Date of Patent: January 15, 2002
    Assignee: P.T. Hartono Istana Electronics
    Inventors: J. Dwidjaja Setiabudi, Adisusanto, Setiawan Yusran, Nafis Dwi CW, Sutarno
  • Audio visual karaoke system using audio cassette
    Patent number: 5609487
    Abstract: An audio visual karaoke system using a karaoke audio cassette to which high frequency signals have been added containing specific data information. In the audio player, these high frequency signals are separated from the audio signals by a high pass filter ("HPF"). Using a data converter, the high frequency signals are converted into data information. Subsequently, this data information is processed by a microprocessor and a display controller to generate lyrics or other information, which are displayed on a display device.
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: March 11, 1997
    Assignee: P. T. Hartono Istana Electronics
    Inventors: Dwidjaja Setlabudi, Djunedhi Listyono, Ketut Wihardika, Markus S. B. Sutikno, Ariffin Setawidjaja, Budianto, Fransiscus X. S. Wijaya