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    • 25. 发明授权
    • Digital-to-analog converter and method of digital-to-analog conversion
    • 数模转换器和数模转换方法
    • US08013769B2
    • 2011-09-06
    • US11714896
    • 2007-03-07
    • Hyung-Tae Kim
    • Hyung-Tae Kim
    • H03M1/66
    • G09G3/3688G09G3/2011G09G2310/027G09G2320/0276H03M1/68H03M1/76H03M1/806
    • In one embodiment, the DAC includes an analog gray voltage generation unit configured to generate a plurality of analog gray voltages, and a first decoder configured to select two different voltages of the plurality of the gray voltages as a first level voltage and a second level voltage, respectively, in response to an upper K-bits of N-bit input image data. Here, N may be an integer not less than two, and K may be an integer less than N. A second decoder may be configured to repeatedly distribute the first level voltage and the second level voltage to output a plurality of distributed voltages in response to a lower L-bits of the N-bit input image data. Here, L may be equal to N subtracted by K, and L may be less than K. An interpolated voltage generation unit may be configured to generate an interpolated voltage based on the plurality of distributed voltages.
    • 在一个实施例中,DAC包括被配置为产生多个模拟灰度电压的模拟灰度电压生成单元,以及第一解码器,被配置为选择多个灰度电压中的两个不同电压作为第一电平电压和第二电平电压 分别响应于N位输入图像数据的高K位。 这里,N可以是不小于2的整数,K可以是小于N的整数。第二解码器可以被配置为重复分配第一电平电压和第二电平电压,以响应于 N位输入图像数据的较低的L位。 这里,L可以等于被K减去的N,并且L可以小于K.内插电压生成单元可以被配置为基于多个分布电压产生内插电压。
    • 29. 发明授权
    • Remotely operated portable wireless video/audio monitoring system
    • 遥控便携式无线视频/音频监控系统
    • US06671520B1
    • 2003-12-30
    • US09497979
    • 2000-02-04
    • Hyung-Tae Kim
    • Hyung-Tae Kim
    • H04B138
    • H04L67/025G08C17/02H04B1/202H04L67/04H04L69/329H04W8/26H04W48/08H04W52/0241Y02D70/40
    • A remotely operated wireless video/audio hand-held monitoring system comprises a central station having a display and a speaker, and at least one remote terminal having a camera and a microphone. The central station is adapted to send out control command data containing a remote terminal identifier, a communication frequency channel number and any one of a test command, a power on command and a power off command, to receive response data corresponding to the control command data and to reproduce video and audio signals transmitted at a frequency corresponding to the communication frequency channel number, respectively, through the display and speaker in response to the received response data. The remote terminal is adapted to receive the control command data from the central station, to send out the response data corresponding to the received control command data to the central station and to, in a power on mode based on the power on command, drive the camera, the microphone and a video/audio signal transmitter and transmit a video signal from the camera and an audio signal from the microphone to the central station at the frequency corresponding to the communication frequency channel number. Therefore, one portable central station can selectively control one or more remote terminals to monitor images and voices at remote locations.
    • 遥控操作的无线视频/音频手持监视系统包括具有显示器和扬声器的中央站以及具有相机和麦克风的至少一个远程终端。 中央站适于发送包含远程终端标识符,通信频道号以及测试命令,通电命令和关机命令中的任何一个的控制命令数据,以接收与控制命令数据相对应的响应数据 并且响应于接收到的响应数据,通过显示器和扬声器分别再现以对应于通信频道号码的频率发送的视频和音频信号。 远程终端适于从中央站接收控制命令数据,将对应于所接收的控制命令数据的响应数据发送到中心站,并且基于电源开启命令,以电源接通模式驱动 相机,麦克风和视频/音频信号发射器,并以与通信频道号相对应的频率从摄像机发送视频信号和从麦克风到中心站的音频信号。 因此,一个便携式中心站可以选择性地控制一个或多个远程终端来监视远程位置处的图像和语音。