彩色电视机的结构与工作原理（The structure and working principle of color TV set）.docVIP

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彩色电视机的结构与工作原理（The structure and working principle of color TV set）.doc

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彩色电视机的结构与工作原理（The structure and working principle of color TV set）

彩色电视机的结构与工作原理（The structure and working principle of color TV set） Basic block diagram of 2.1.1 color TV receiver In our country color TV sets adopt superheterodyne internal carrier type receiving technology. Superheterodyne refers to the radio frequency television signal received by the antenna. After the high frequency amplification, the local oscillator signal generated by this machine is mixed to obtain a fixed intermediate frequency signal. The internal carrier type refers to the difference between the intermediate frequency signal of the second sound due to the beat when the image intermediate frequency signal and the sound intermediate frequency signal pass the detection stage. The basic components of color TV set include common channel, audio channel, brightness channel, chroma decoding system, imaging system, scanning system, power supply system, control system and so on. Basic block diagram of color TV set The role of the various parts of the 2.1.2 television Public channel: including high-frequency tuner, image amplifier circuit, synchronous detector circuit, is RF television signal frequency selection, amplification, frequency conversion, demodulation processing video video signal and audio signal second. Audio channel is mainly composed of an audio amplifier circuit, frequency discriminator circuit, output circuit, and other components of the speaker, is second audio signal amplification, frequency discriminator, power amplifier, audio signal form drives a loudspeaker to reproduce the sound information. Brightness: mainly by the 4.43MHz notch filter, the brightness signal processing circuit, a brightness signal is separated from the image in the video signal, then amplified, correction, delay, DC recovery processing, the basic form of black and white image signal. Chroma decoding system is mainly composed of 4.43MHz filter, chroma signal processing circuit, color subcarrier recovery circuit, matrix circuit etc. the effect is excellent and the color sepa