Patents by Inventor Li-Chang Lai

Li-Chang Lai 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).

  • Audio output apparatus capable of suppressing pop noise
    Patent number: 8036399
    Abstract: An audio output apparatus includes: an audio codec outputting an analog audio signal corresponding to a digital audio signal from a system controller; a switch unit having a first end coupled to the audio codec through a capacitor, and a grounded second end; and a switch controller triggered by a trigger signal to output a control signal to a control end of the switch unit such that the switch unit couples the capacitor to ground in response to the control signal. The trigger signal is generated by one of the system controller, the audio codec, and a power circuit supplying electric power to the system controller, the audio codec and the switch controller upon occurrence of a condition associated with pop noise, and is outputted to the switch controller before the pop noise is generated, such that the pop noise is conducted to ground via the switch unit.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: October 11, 2011
    Assignee: Twinhead International Corporation
    Inventors: Chun-Chen Chao, Li-Chang Lai, Shih-Yuan Chang
  • Audio Output Apparatus Capable Of Suppressing Pop Noise
    Publication number: 20100158270
    Abstract: An audio output apparatus includes: an audio codec outputting an analog audio signal corresponding to a digital audio signal from a system controller; a switch unit having a first end coupled to the audio codec through a capacitor, and a grounded second end; and a switch controller triggered by a trigger signal to output a control signal to a control end of the switch unit such that the switch unit couples the capacitor to ground in response to the control signal. The trigger signal is generated by one of the system controller, the audio codec, and a power circuit supplying electric power to the system controller, the audio codec and the switch controller upon occurrence of a condition associated with pop noise, and is outputted to the switch controller before the pop noise is generated, such that the pop noise is conducted to ground via the switch unit.
    Type: Application
    Filed: December 18, 2008
    Publication date: June 24, 2010
    Inventors: Chun-Chen Chao, Li-Chang Lai, Shih-Yuan Chang