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測試色是利用最簡單的電子方式產生。早期的檢驗圖是使用飛點掃描器（英语：Flying spot scanner）（Flying spot scanner）或影片放映機組（Telecine camera chain）藉由光線對圖片的反射或幻燈片的照射而產生圖形，其
built a camera tube, his system was limited to using the CRT as a flying spot scanner to transmit motion picture films and slides. 模擬電視廣播將於60日後停止. hk.news
built a camera tube, his system was limited to using the CRT as a flying spot scanner to transmit motion picture films and slides. https://hk.news.yahoo
built a camera tube, his system was limited to using the CRT as a flying spot scanner to transmit motion picture films and slides. 電視的歷史. [2016-08-11]
vertical camera, a K-477 split vertical day-night camera, an infrared scanner, and a KA-1 left oblique camera. The modified aircraft were redesignated