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(4)副载波恢复电路徒弟:在上期师傅讲述了PAL制编码器的组成电路及原理、彩色解码器中彩色全电视信号的分解(解码)过程、亮度信号通道和色度信号通道的组成电路及工作原理,并已提及了同步检波(解调)所需要的副载波信号,请师傅继续讲一讲,副载波恢复(或产生)电路的作用、组成和工作原理好吗? 师傅:好。彩色电视信号在电视信号发送端,副载波是被抑制掉的,只传送它的边带波,因为副载波本身不包含电视信号内容。而在电视机接收端,为了从全
(4) Subcarrier Recovery Circuit Apprentice: In the previous period, the teacher described the circuit and principle of the PAL system encoder, the process of the decomposition (decoding) of the color television signal in the color decoder, the circuit of the luminance signal and the channel of the chrominance signal And working principle, and has mentioned the synchronous detection (demodulation) required subcarrier signal, the master continue to talk about the subcarrier recovery (or produce) the role of the circuit, the composition and working principle is good? . The color television signal is at the transmitting end of the television signal, the subcarrier is suppressed and only the sideband wave is transmitted because the subcarrier itself does not contain the television signal content. In the television receiver, in order to from the whole