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PAL制有亮串色和色串亮的干扰现象,而且因为在电视接收机中必须抑制色度副载波,从而使亮度信号的水平分解力降低,用以下方法可以克服PAL制的这一缺点:用一行传送全带宽的亮度信号,而在下一行则以频率复用方式传送亮度信号的低频部分及正交调制的PAL色度副载波,并保留原有逐行相位交替的PAL色同步信号。用这样一种方法传送的图象是无串扰的,并有较高的亮度水平分解力。所付出的代价一是降低了亮度信号的对角分解力;二是象MAC方式一样降低了色差信号的垂直分解力,这种I-PAL信号完全适用于处理普通PAL信号的一切设备,并且I-PAL电视接收机也可以兼容接收通常的PAL信号。这种方式也可用于NTSC制。
The PAL system has a bright string color and a bright color string interference phenomenon, and because the television receiver must suppress the chrominance subcarrier, thereby reducing the horizontal resolution of the luminance signal, the following method can overcome this shortcoming of the PAL system: While the next line transmits the low frequency part of the luminance signal and the orthogonally modulated PAL chrominance subcarrier in a frequency multiplexing manner and retains the original PAL color burst signal of the original progressive line. Images transmitted in such a way are crosstalk-free and have high brightness level resolution. The first price is to reduce the diagonal resolution of the luminance signal; the second is the same as the MAC mode to reduce the vertical resolution of the color difference signal, this I-PAL signal is fully suitable for processing all PAL signals ordinary equipment, and I -PAL TV receivers are also compatible for receiving normal PAL signals. This method is also applicable to the NTSC system.