公开(公告)号：US20120163417A1

公开(公告)日：2012-06-28

申请号：US13393537

申请日：2010-07-16

申请人： Toshinori Mori ,  Ryo Ishikawa ,  Hitoshi Nabata ,  Yasunao Suzuki

发明人： Toshinori Mori ,  Ryo Ishikawa ,  Hitoshi Nabata ,  Yasunao Suzuki

IPC分类号： H04B1/713

CPC分类号： H04K3/825 ,  H04K3/42 ,  H04K2203/14

摘要： A spread spectrum modulation unit (12) performs spread spectrum clocking processing for a basic clock signal (BC) synchronized with the carrier frequency or its harmonic frequency of image information leaked from an unwanted electromagnetic wave. A modulation pattern generation unit (13) generates and outputs, as a modulation pattern signal (MP), a PN code having sign bit data synchronized with each pulse of the obtained spread spectrum clock signal SC. In addition, the modulation pattern generation unit (13) resets the repetition period of the PN code based on a horizontal sync signal (H). A modulated clock generation unit (14) modulates the spread spectrum clock signal (SC) in accordance with the modulation pattern signal (MP). The obtained modulated clock signal (MC) is amplified, generating a leakage prevention signal (JC). A leakage prevention signal containing a sideband component of a satisfactory level can be generated, obtaining a useful leakage prevention effect.

摘要翻译： 扩展频谱调制单元（12）对与从不需要的电磁波泄漏的图像信息的载波频率或其谐波频率同步的基本时钟信号（BC）进行扩频时钟处理。 调制图案生成单元（13）生成并输出与获得的扩频时钟信号SC的每个脉冲同步的符号位数据作为调制模式信号（MP）。 此外，调制模式生成单元（13）基于水平同步信号（H）来重置PN码的重复周期。 调制时钟生成单元（14）根据调制模式信号（MP）对扩频时钟信号（SC）进行调制。 获得的调制时钟信号（MC）被放大，产生防漏信号（JC）。 可以生成包含令人满意的边带分量的防漏信号，从而获得有用的防漏效果。