Patents by Inventor Jin H. Yun

Jin H. Yun 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).

  • Patent number: 4947263
    Abstract: The invention provides a device that selects the input image signal out of image signals of a TV set, VCR and an external apparatus in the TV with VCR. The device includes two ICs for switches Nos. 1 and 2, muting circuits 4 and 5, inverters 8, image signal insulation section 12, LED drive 17 and photocoupler 18. The ICs operate the internal switches according to the low or high voltage applied to respective control terminals T0, T1 and L0, L1. The image signal insulation 12 insulates to perform amplification and DC clamping in compliance with the input image signals.
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: August 7, 1990
    Assignee: Goldstar Co., Ltd.
    Inventor: Jin H. Yun
  • Patent number: 4507524
    Abstract: A loudspeaker telephone system is comprised of a voice switching circuit, hybrid, and power supply circuit. The voice switching circuit includes comparators for comparing speech through the main paths with a side tone through auxiliary paths, time constant circuits for controlling exponentially a pair of variable gain amplifiers for making or breaking the sending and receiving signals, and band pass filters arranged in each input of the comparators for rejecting indoor noise as well as the line noise coming into the loudspeaker telephone system through the lines. Accordingly, the howling effect between microphone and loudspeaker is negligible; transfer from a sending mode to a receiving mode is easily made while maintaining naturalness of the voice. By inclusion of impedance matching elements in a conventional hybrid, the hybrid can be used in common either in the present loudspeaker telephone system or in a conventional telephone system.
    Type: Grant
    Filed: March 17, 1982
    Date of Patent: March 26, 1985
    Assignee: Gold Star Tele-Electric Co., Ltd., Inc.
    Inventor: Jin H. Yun