Patents by Inventor Bobby T. Hsieh

Bobby T. Hsieh 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).

  • System and method for multiplexing control signals over data signal conductors
    Patent number: 5995633
    Abstract: A system and method for multiplexing control signals over data signal conductors comprises an audio source for generating audio signals, a speaker device for monitoring the audio signals, a first high-pass filter for filtering the audio signals, a signal cable over which the audio signals are transmitted, a second high-pass filter for again filtering the audio signals, and headphones for monitoring the audio signals. The system and method further comprises a current source for generating a control signal whenever the headphones are connected and for transmitting the control signals over the signal cable, and a detector device for receiving the control signals and responsively using them to mute the speaker device.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: November 30, 1999
    Assignee: Apple Computer, Inc.
    Inventors: Richard D. Cappels, Douglas M. Farrar, Bobby T. Hsieh, Takashi Mori