| 摘要 |
<p>of the Invention A picture-in-picture television receiver for which the viewer may change the size of the inset image includes an adaptive anti-aliasing filter. Composite video signals which produce the inset image are applied to a separation filter which attenuates the chrominance components to provide separated luminance signals. The luminance signals are applied to a second filter which includes a variable delay element and an adder. The luminance signals are applied to one input port of the adder and to the d lay element. The signals provided by the delay element are applied to the second input port of the adder. The delay element provides time delays which may be expressed by the equation T = K2?+PK1? where ? is a fixed amount of time, K1 and K2 are constants and P is a variable. The frequency response characteristic of the filter is changed by changing the value of P.</p> |
