Television Television-----the most pervasive and persuasive of modern technologies, marked by rapid change and growth-is moving into a new era, an era of extraordinary sophistication and versatility, which promises to reshape our lives and our world. It is an electronic revolution of sorts, made possible by the marriage of television and computer technologies. The word television, derived from its Greek and Latin roots, can literally be interpreted as sight from a distance. Very simply put, it works in this way: through a sophisticated system of electronics, television provides the capability of converting an image into electronic impulses, which can be sent through a wire or cable. These impulses, when fed into a receiver , can then be electronically reconstituted into that same image. Television is more than just an electronic system, however. It is a means of expression, as well as a vehicle for communication, and as such becomes a powerful tool for reaching other human beings. The field of television can be divided into two categories determined by its means of transmission. First, there is broadcast television, which reaches the masses through broad-based airwave transmission of television signals. Second, there is nonbroadcast television, which provides for the needs of individuals or specific interest groups through controlled transmission techniques. Traditionally, television has been a medium of the masses. We are most familiar with broadcast television because it has been with us for about thirty-seven years in a form similar to what exists today. During those years, it has been controlled, for the most part, by the broadcast networks, ABC, NBC, and CBS, who have been the major purveyors of news, information, and entertainment. These giants of broadcasting have actually shaped not only television but our perception of it as well. We have come to look upon the picture tube as a source of entertainment, placing our role in this dynamic medium as the passive viewer.
2016秋科普版英语五上Lesson 4《Does Jim like swimming》ppt课件1
2016秋科普版英语五上Lesson 3《A computer has a keyboard》ppt课件2
2016秋科普版英语五上Lesson 7《What would you like》ppt课件3
2016秋科普版英语五上Lesson 8《Would you like some potatoes》ppt课件1
2016秋科普版英语五上Lesson 3《A computer has a keyboard》ppt课件1
小学英语语法《形容词比较级》教学研讨
六年级英语下册Unit 5
牛津6A Unit 4 It was there
2016秋科普版英语五上Lesson 4《Does Jim like swimming》ppt课件3
六年级下册Unit 2 《What’s the matter》
牛津6A Unit 6 New Year’s Day
2016秋科普版英语五上Lesson 7《What would you like》ppt课件2
2016秋科普版英语五上Lesson 7《What would you like》ppt课件7
2016秋科普版英语五上Lesson 5《What does he like》ppt课件1
牛津6B Unit 7 A letter to a penfriend
2016秋科普版英语五上Lesson 5《What does he like》ppt课件2
小学语法《现在进行时》教学研讨课
人教PEP版英语六上《unit 6 the story of rain》dialogue(3) flash课件
牛津6A Unit 1 CD
牛津6A Unit 3 It was there
牛津 6B Unit 3(parta)
人教PEP版英语六上《unit 5 what does she do》 chant flash课件
人教版六年级上册英语语法《一般将来时》
牛津6A Unit 1 A(第二课时)
2016秋科普版英语五上Lesson 4《Does Jim like swimming》ppt课件2
2016秋科普版英语五上Lesson 7《What would you like》ppt课件5
牛津6B Unit 6 D,E,G
2016秋科普版英语五上Lesson 5《What does he like》ppt课件6
2016秋科普版英语五上Lesson 7《What would you like》ppt课件6
牛津6BUnit 6 Planning for the weekend
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |