Patents by Inventor Chin Poh Koh

Chin Poh Koh 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).

  • Sound signal generator testing apparatus
    Patent number: 8054982
    Abstract: A sound signal generator testing apparatus is provided. The apparatus includes a hermetic seal (2), a sound signal input unit (4), and at least a noise suppression unit (5). The sound signal input unit is for receiving sound signals transmitted from a sound signal generator (1) under testing. Each noise suppression unit includes a sound signal input unit, a low pass filter, an inverter, and an output. The sound signal input unit is for receiving sound signals. The low pass filter is for filtering the sound signals by passing the low frequencies of the sound signals that are below a predetermined value. The inverter is for inverting phases of the sound signals transmitted from the low pass filter and producing inverted sound signals. The output unit is placed behind the sound signal input unit for outputting the inverted sound signals.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: November 8, 2011
    Assignee: Hon Hai Precision Industry Co., Ltd.
    Inventors: Tsung-Lung Yang, Chin Poh Koh, Shin-Hong Chung, Shu-Ho Wu, Kuan-Hong Hsieh