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    • 9. 发明申请
    • COLOR SIGNAL REPRODUCING APPARATUS OF TELEVISION SIGNAL
    • 电视信号彩色信号再现设备
    • WO00072588A1
    • 2000-11-30
    • PCT/JP2000/003114
    • 2000-05-16
    • H04N5/46H04N5/455H04N9/45H04N9/64H04N9/68H04N9/78H04N11/18
    • H04N5/455H04N5/46H04N9/68H04N11/186
    • The color signal reproducing apparatus of the invention is composed of multipliers (104, 105) for issuing X- and Y-axis signals by multiplying the color subcarrier signal of SECAM composite video signal by SIN component or COS component of local subcarrier signal, an ACC control voltage generator (106) for generating an ACC control signal by squaring and adding the X- and Y-axis signals in the burst gate pulse period, and a gain controller (102) for adjusting the amplitude of color subcarrier, and is constructed to control the gain controller by its ACC control signal. While using the color signal reproducing circuit commonly in three major television systems in the world, ACC of high precision is realized even in the case where the S/N state of SECAM color subcarrier signal is lowered.
    • 本发明的彩色信号再现装置由乘法器(104,105)组成,用于通过将SECAM复合视频信号的彩色副载波信号乘以本地子载波信号的SIN分量或COS分量来发出X和Y轴信号,ACC 控制电压发生器(106),用于通过在脉冲串脉冲周期内平方和相加X轴和Y轴信号产生ACC控制信号;以及增益控制器(102),用于调整彩色副载波的振幅,并被构造成 通过其ACC控制信号控制增益控制器。 在世界三大电视系统中通常使用彩色信号再现电路的同时,即使在SECAM彩色副载波信号的S / N状态降低的情况下也能实现高精度的ACC。
    • 10. 发明申请
    • ADAPTIVE ANTI-CROSSCOLOR NOTCH FILTER FOR SECAM ENCODER
    • 用于SECAM编码器的自适应防透镜过滤器
    • WO00005900A1
    • 2000-02-03
    • PCT/US1999/012379
    • 1999-07-20
    • H04N9/64H04N11/18
    • H04N9/646H04N11/183
    • A luminance notch filter for preventing color crosstalk adaptively attenuates a SECAM luminance signal depending on the strength of the luminance signal using digital filtering techniques. The adaptive luminance notch filter includes a bandpass filter centered at the chrominance band that is operative to receive the input luminance signal and provide a bandpass filtered luminance signal. The bandpass filtered luminance signal is multiplied by a gain factor and the multiplied luminance signal is subtracted from the input luminance signal to provide a notch filtered luminance signal. A detector coupled to the bandpass filter output detects the signal strength of the bandpass filtered luminance signal and the gain factor is adapted in accordance with the detected signal strength. The bandpass filter comprises an infinite impulse response (IIR) filter that is preferably an all-pole IIR filter of at least 3rd order.
    • 用于防止颜色串扰的亮度陷波滤波器使用数字滤波技术根据亮度信号的强度自适应地衰减SECAM亮度信号。 自适应亮度陷波滤波器包括以色度频带为中心的带通滤波器,其操作以接收输入亮度信号并提供带通滤波的亮度信号。 带通滤波的亮度信号乘以增益因子,并从输入的亮度信号中减去相乘的亮度信号,以提供陷波滤波的亮度信号。 耦合到带通滤波器输出的检测器检测带通滤波的亮度信号的信号强度,并且根据检测到的信号强度适配增益因子。 带通滤波器包括无限脉冲响应(IIR)滤波器,其优选为至少三阶的全极IIR滤波器。