论文部分内容阅读
亮度信号的处理分记录和重放两种状态进行。由于处理的信号不同,所以记录和重放的亮度通道是各自独立的。一、亮度记录通道(一)非线性预加重为提高被记录的亮度信号的抗干扰能力,在进行调频之前,需先对输入信号进行预加重处理。所谓预加重是对输入调频信号中的高频部分提升一定的增益,在重放时对它作去加重处理,以提高高频成分的信噪比。在电视信号中,不同电平的亮度电压代表不同的灰度层次。电平越低,灰度越暗,图像中的噪声可见度
Luminance signal processing sub-record and replay two states. Due to the different signals processed, the brightness channels for recording and playback are independent. First, the brightness of the recording channel (a) non-linear pre-emphasis In order to improve the anti-jamming ability of the recorded brightness signal, before the FM, you need to pre-emphasis the input signal. The so-called pre-emphasis on the input frequency modulation signal in the high-frequency part of a certain gain, in the replay it to deepen the processing to improve the high-frequency components of the signal to noise ratio. In television signals, the different levels of brightness voltages represent different levels of gray levels. The lower the level, the darker the grayscale, and the noise visibility in the image