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Pre-emphasis sampling mode filter for SECAM TV colour coder - operates on chrominance subcarrier signal by digital sampling to achieve specified transfer function
Pre-emphasis sampling mode filter for SECAM TV colour coder - operates on chrominance subcarrier signal by digital sampling to achieve specified transfer function
The filter has an 'inverted bell' response, intended for use with the chrominance signal of a SECAM colour television encoder. The filter operates by sampling, preferable digitally, and has a transfer function of the form (G(z)=a+bz power -1+cz power -2. The sampling frequency is four times the frequency of the chrominance sub-carrier in the PAL colour television system. The filter includes a first delay element (15) whose input is connected to the first inputs (20,18) of two adders (21,17) - one via a further delay line (19). The first adder output is fed directly to one input of a subtractor (28), while the second adder output passes via further processing circuitry to the second subtractor input. The subtractor output then forms the final output of the filter circuit.
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机译:该滤波器具有“倒钟”响应,旨在与SECAM彩色电视编码器的色度信号一起使用。该滤波器通过采样(最好是数字方式)进行操作,并具有形式为(G(z)= a + bz功率-1 + cz功率-2)的传递函数。采样频率是色度子载波在该滤波器包括一个第一延迟元件(15),其输入连接到两个加法器(21,17)的第一输入(20,18),一个经由另一延迟线(19)。加法器输出被直接馈送到减法器(28)的一个输入,而第二加法器输出通过进一步的处理电路到达第二减法器输入,然后减法器输出形成滤波电路的最终输出。
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