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数字电视（Digital TV）
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Theprocessquantizingthecontinuousvaluesintoabinaryscaleiscalled().
A.digital-to-analogconversionB.digital-to-digitalconversionC.analog-to-digitalconversionD.analog-to-analogconversion
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With digital video recorders such as Sky＋ and Tivo, viewers can easily skip TV commercials.()
此题为判断题(对，错)。
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He asked Li Hong, “Were you watching TV at this time yesterday?” = He asked Li Hong if______.
A、she was watching TV at this time yesterdayB、she is watching TV at that time the day beforeC、she was watching TV at that time the day beforeD、was she watching TV at that time the day before
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Directions: Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on ANSWER SHEET I. ( 10 points)Digital photography is still new enough that most of us have yet to form. an opinion about it, (1) develop a point of view. But this bash' t stopped many film and computer fans from agreeing (2) the early conventional wisdom about digital cameras—they' re neat (3) for you? But they're not suitable for everyday picture taking.The fans are wrong: Moro than anything else, digital cameras are radically (4) what photography means and what it can be. The venerable medium of photography (5) we know it is beginning to seem out of (6) with the way we live. In our computer and camcorder (7) saving pictures as digital (8) and watching them on TV is no less practical—and in many ways more (9) than fumbling with rolls of film that must be sent off to be (10)Paper is also terribly (11) . Pictures that are incorrectly framed, (12) ,or lighted are nonetheless committed to film and ultimately processed into prints.The digital medium changes the (13) . Still images that are (14) digitally can immediately be shown on a computer (15) , a TV screen, or a small liquid - crystal display (LCD) built fight into the camera. And since the points of light that (16) an image are saved as a series of digital bits in electronic memory, (17) being permanently etched onto film, they can be erased, retouched, and transmitted (18) .What's it like to (19) with one of these digital cameras? It's a little like a first date--exciting, confusing and fraught with (20) .1. A) rather thanB) let aloneC) much lessD) so as to
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is a one -way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.(74) is a device used to connect two separate network that use different communication protocol.(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.A．MDB．RSAC．DESD．MIB
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What would be the best title for the passage?A.TV Will Rule the WorldB.TV Will Disturb the WorldC.TV Will Better the WorldD.TV Will Remain in World
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（）全称为Digital Video Broadcasting Handheld，它是欧洲的数字电视标准组织（DVB）为通过地面数字广播网络向便携/手持终端提供多媒体业务所制定的传输标准。
考题
Which statement is true about the digital to analog conversion process？（）A、the two steps of digital to analog conversion are decompression and reconstruction of the analog signalB、the two steps of digital to analog conversion are decoding and filteringC、the two steps of digital to analog conversion are decompression and filtering of the analog signalD、the two steps of digital to analog conversion are quantization and decoding
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Birthday attacks are used against which of the following？（）A、 digital signaturesB、 symmetric cipheringC、 hashalgoritmsD、 asymmetric cipheringE、 digital certificates
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填空题（）全称为Digital Video Broadcasting Handheld，它是欧洲的数字电视标准组织（DVB）为通过地面数字广播网络向便携/手持终端提供多媒体业务所制定的传输标准。
考题
单选题Which statement is true about the digital to analog conversion process？（）A
the two steps of digital to analog conversion are decompression and reconstruction of the analog signalB
the two steps of digital to analog conversion are decoding and filteringC
the two steps of digital to analog conversion are decompression and filtering of the analog signalD
the two steps of digital to analog conversion are quantization and decoding
考题
名词解释题数字电视（Digital TV）
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