摘要:
彩色電視測(cè)試卡是一種以直觀方式評(píng)價(jià)彩色電視接收機(jī)質(zhì)量的測(cè)試信號(hào).我們以Z80微處理機(jī)為核心,組成了彩色電視同步信號(hào)和彩色測(cè)試卡發(fā)生裝置。將微機(jī)技術(shù)、數(shù)字技術(shù)和模擬技術(shù)結(jié)合在一起,并發(fā)揮微機(jī)軟件的作用,使原先需要使用大量組合和時(shí)序邏輯電路才能產(chǎn)生的各種信號(hào)(如復(fù)合同步、復(fù)合消隱等同步信號(hào)和圓、彩條、灰條、時(shí)鐘等測(cè)試卡信號(hào))盡可能地用軟件直接產(chǎn)生或用軟件簡(jiǎn)化控制電路,通過(guò)以軟代硬來(lái)實(shí)現(xiàn)整個(gè)系統(tǒng)的小型化、高可靠、低成本。所有軟件均固化于EPROM中,通過(guò)改變軟件即可方便地改變測(cè)試卡圖形的排列和圖案的內(nèi)容而不必大量地改變硬件結(jié)構(gòu)。同樣,只需修改軟件中同步信號(hào)形成程序,便可按需要產(chǎn)生各種非廣播電視標(biāo)準(zhǔn)的同步信號(hào)和測(cè)試卡。
Abstract:
Test-card for colour TV is a signal widely used to evaluate visually the quality of a TV set. Based on the microprocessor Z-80 a test-card generator for colour TV with synchronizing is realized. By taking advantage of microprocessor programming, the techniques of computer, digital and IC are combined to simplify greatly the system circuits which originally need a large quantity of logical gates. Now, the functions of control and the generation of signal, such as compound synchronous signal, compoud blanking signal, etc, are realized with the help of CPU programming to get the advantages of low cost, high reliability and small size. All system programs are stored in EPROMs and thus any wanted changes in the pattern of test card can be conveniently realized by changing programs, and it is not necessary to change the whole configuration of the hardware circuits. The system can also be transferred into different types of non-standard TV synchronizers and test-card generators by only changing the programs.
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