发布时间： 2016年06月07日

考研英语阅读理解全真模拟题工学类试题（二十一）

Assistants in record shops are used to receiving “humming queries”： a customer comes into the store humming a song he wants， but cannot remember either the title or the artist. Knowledgeable staff are often able to name that tune and make a sale. Hummers， though， can be both off-key and off-track. Frequently， therefore， the cash register stays closed and the customer goes away disappointed. A new piece of software may change this. If Online Music Recognition and Searching (OMRAS) is successful， it will be possible to hum a half-remembered tune into a computer and get a match.

OMRAS， which has just been unveiled at the International Symposium on Music Information Retrieval， in Paris， is the brainchild of a group of researchers from the Universities of London， Indiana and Massachusetts. Music-recognition programs exist already， of course. Mobile-phone users， for instance， can dial into a system called Shazam， hold their phones to a source of music， and then wait for the title and artist to be texted back to them.

Shazam and its cousins work by matching sounds directly to recordings， several million of them， stored in a central database. For Shazam to make a match， though， the music source must be not just similar to， but actually identical with， one of the filed recordings. OMRAS， by contrast， analyses the music. That means it can make a match between different interpretations of the same piece. According to Mark Sandler， the leader of the British side of the project， the program would certainly be able to match performances of the same work by an amateur and a professional pianist. It should also pass the humming-query test.

The musical analysis performed by OMRAS is unlike any that a musicologist would recognise. A tune is first digitised， so that it can be processed. It is then subject to such mathematical indignities as wavelet decomposition， multi-resolution Fourier analysis， polyphase filtering and discrete cosine transformation. The upshot is a mathematical model of the sound that contains the essence of the original， without such distractions as style and quality. That essence can then be compared with a library of known essences and a match made. Unlike Shazam， only one library reference per tune is needed.

So far， Dr Sandler and his colleagues have been restricted to modelling classical music. Their 3，000-strong database includes compositions by Bach， Beethoven and Mozart. Worries about copyright mean that they have not yet gained access to company archives of pop music， though if the companies realise that the consequence of more humming queries being answered is more sales， this may change. On top of that， OMRAS could help to prevent accidental copyright infringements， in which a composer lifts somebody else's work without realising his inspiration is second-hand. Or， more cynically， it will stop people claiming that any infringement was accidental. There is little point in doing that when a quick check on the Internet could have set your mind at rest that your magnum opus really was yours.

注(1)：本文选自Economist;10/19/2002， p77， 2/3p， 1c;

注(2)：本文习题命题模仿对象2000年真题text 3第1题(1)，2001年真题text 4第2题(2)，2004年真题text 3第4题(3);2003年真题text 1第4题(4)，2002年真题text 3第5题(5);

1. The passage is mainly__________.

[A] a comparison of two music-recognition programs

[B] an introduction of a new software

[C] a survey of the music recognition and searching market

[D] an analysis of the functions of music recognition softwares

2. According to the author， one of the distinctive features of OMRAS is________.

[A] its ability to analyze music

[B] its large database

[C] its matching speed

[D] its ability to match music of different pieces