电视基本电路组成（Basic circuit of television）.doc

电视基本电路组成（Basic circuit of television） This article is contributed by zhjPpt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. Basic circuit composition and signal flow of color TV receiver Basic composition of colour TV set Color TV mainly consists of five parts: 1, public channel; 2, sound channel; 3, decoding circuit; 4, synchronous scanning system (including picture tube and its subsidiary circuit); 5, switch power supply circuit. Block diagram of PAL integrated circuit color TV set 1, public access 1, the basic components of public channel is composed of a high frequency tuner (Gao Pintou), image, video detection and pre release, in addition to denoising, AGC and AFT circuit. The working process is as follows: Common channel block diagram C / Y Y (metric input, frequency, S, c) r b R (input V, G, G, A, H + S / V ) Y, V, G, A, R, B Y Y C, V, B, S, T / V C U As at the end of the road yet V Small scanning field Signal division number Color field of path coding Road electric outlet site Turn the electric drift Road ionization step by step Electric vibration sweeping field Routing feed back line Road electric discharge scanning field Current offset Thats ok Road Electrical Discharge The F T switches back to line B Extreme pressure and extreme Yang Public channel signal flow 2, working process of TV antenna receives high frequency television signal, first through the tuner would choose a receiving channel signal into high level amplification, and then mixing in the mixing stage and the vibration signal, converted to TV signal to the intermediate frequency surface acoustic wave filter (SAWF), the amplitude frequency characteristics of it, Common channel - signal flow The amplitude transmission characteristic of the discharge circuit in the desired image is obtained, thereby obtaining the frequency characteristic of the desired intermediate frequency signal. Then