用英文介绍一种电子产品例如mp3,电子词典等

用英文介绍一种电子产品例如mp3,电子词典等
用英文介绍一种电子产品
例如mp3,电子词典等

用英文介绍一种电子产品例如mp3,电子词典等
What is MP3 MP3 full name is Moving Picture Experts Group , Audio Layer III one , technology used by it is third generation developing out on compression technology in VCD (MPEG-1) VF , but not MPEG-3. MP3 is one kind of the international technical norms that VF compresses , start from 1980 age medium term (1987), before Germany Erlangen Fraunhofer research institute begin code studying the sound concentrating efforts on height mass , low data rates. Be in DietUnder Seitzer help of Germany professor of university, 1989, Fraunhofer patent being obtained
permission to have got MP3 in Germany, the quilt submits almost annual last this technology to
International Standards Organization (ISO) , integrates to have entered the MPEG-1 standard. The
MPEG sound standard provides independent three compression arrangement of ideas: 1 tier of (1, tier
of Layer) 2 (Layer 2) composes in reply 3 tier of (Layer 3), the consumer may be on the march
between complexity and sound quality judging to the arrangement of ideas choice. (1) 1's tier of
coders are Complicated 2's tier of coders degree is medium (2) , the coder data-out rates are 256 kb/s ~ 192 kb/s, the person applies including that the figure broadcasts sound (digital broadcast audio , DBA) , figure music , CD-I (compact disc-interactive) and VCD (video compact disc) etc.3's tier of coders are most complicated (3) , the coder data-out leads being 64 kb/s, apply to upper voice transmission of ISDN mainly.
Mpeg-1 lay 3 support sampling rate are 32 , 44.1 , 48 khz , lead bit supporting 32- -
- 320 kbps Mpeg-2 lay 3 support sampling rate to be 16 , 22.05 , 24 khz , lead bit
supporting 8- - - 160 kbps Fraunhofer to be unable to be in progress extended to here,
with it truns out that again, sampling rate supported by MPEG-2 gets rid of with 2 :
8 , 11.025, and 12 kHz, bit of rates and MPEG-2 are identical , are called \" MPEG 2.5
". M

mp3:
MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a popular digital audio encoding and lossy compression format, designed to greatly reduce the amount of data required to represent a...

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mp3:
MPEG-1 Audio Layer 3, more commonly referred to as MP3, is a popular digital audio encoding and lossy compression format, designed to greatly reduce the amount of data required to represent audio, yet still sound like a faithful reproduction of the original uncompressed audio to most listeners. It was invented by a team of German engineers who worked in the framework of the EUREKA 147 DAB digital radio research program, and it became an ISO/IEC standard in 1991.
电子词典:
A dictionary is a list of words with their definitions, a list of characters with their glyphs, or a list of words with corresponding words in other languages. In a few languages, words can appear in many different forms, but only the lemma form appears as the main word or headword in most dictionaries. Many dictionaries also provide pronunciation information; grammatical information; word derivations, histories, or etymologies; illustrations; usage guidance; and examples in phrases or sentences. Dictionaries are most commonly found in the form of a book. Some dictionaries are also found in electronic portable handheld devices. Most dictionaries are produced by lexicographers

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