仕傑
Lv 4
仕傑 發問時間: 社會與文化語言 · 2 0 年前

可否麻煩幫忙翻譯(1)........謝謝

Abstract: Universal Serial Bus (USB) is rapidly

replacing the serial port on Personal Computers (PC). It

provides high speed flexible interconnectivity between a

PC and its peripherals. It is a low cost solution which

supports data transfer rates up to l2Mbps (USB 1.0) and

480Mbps (USB 2.0). It also provides 5V supply to the

peripheral device. High level of emission was observed in

the power supply wires of the USB while a satellite

receiver (peripheral) was evaluated for its functionality.

On analysis, it was observed that emission from USB can

affect the performance of the peripheral unit depending

on the sensitivity of peripheral device to the power supply

spurious noise. In this paper, the emissions from a typical

PC and methods towards improvement of the emissions

are analysed. Precautions to he taken whenever any

peripheral device is evaluated, for EMI performance, are

discussed. USB, even though a powerful interface, should

he carefully used for a overall performance of the system

in which it is utilized.

1.UNIVERSAL SERIAL BUS

USB is a small port similar to a RJ-45 or RJ-11

connector provided in Personal Computers. Many types

of devices can be connected to the PC using USB. For

example, keyboards, mouse, scanners, finger print

scanners etc. that are usually connected to a serial or

parallel port can be connected to the USB.

The higher data rate of USB 2.0 i.e. 480Mbps opens

up the possibility of connecting next generation, higher

speed and higher resolution printer and scanner devices.

USB transfers signals and power over a four-wire cable

as shown in Figure 1.

The signaling occurs over two wires. There are two

data rates in USB 1.0 itself:

1 The full speed signaling at 12 Mbps rate.

1 A low speed signaling mode at 1.5 Mbps rate

(Fig.1 USB Cable)

Both modes can be supported in the same USB bus

by automatic dynamic mode switching between

transfers. The clock is transmitted, encoded along with

differential data. A SYNC field precedes each packet to

allow the receiver to synchronize their bit recovery

clocks. The cable also carries VBus and GND wires to

deliver power to peripheral devices. Vbus is nominally

+5V at the source. The USB allows cable segments of

variable lengths, up to several meters, by choosing the

appropriate conductor gauge to match the specified IR

drop and other attributes such as device power budget

and cable flexibility.

USB hubs are available and generally support 4 USB

devices. They are self-powered and have a local power

supply that furnishes power to all down stream ports.

Thus USB is going to remain as the communication

port of the PC’s in the coming years; Other than the

regular peripherals, there are some special devices

which function with USB such as satellite receivers for

audio broadcast. Noise problems were noticed during

the functional evaluation of a satellite receiver, which

uses USB bus. The details of the EMI problems and

possible solutions are discussed in this paper.

已更新項目:

是中文......

不是台語.....

sorry...

8 個解答

評分
  • 匿名使用者
    2 0 年前
    最佳解答

    摘要: 通用串形總線(USB) 迅速地替換連續端口在個人電腦(個人電腦) 。它提供高速靈活的interconnectivity 在個人電腦和它的外圍設備之間。這是支持資料轉學比例由l2Mbps 的一種低成本解答(USB 1.0) 並且480Mbps (USB 2.0 決定) 。它並且提供5V 供應對外圍設備。高水平放射被觀察了在USB 的電源導線當衛星接收器(周邊) 被評估了為它的功能。在分析, 它被觀察, 放射從USB 可能影響周邊單位的表現根據外圍設備敏感性對電源假噪聲。在本文裡, 放射從一臺典型的個人電腦和方法往放射的改善被分析。防備措施對他被採取每當任一套外圍設備被評估, 為EMI 表現, 被談論。USB, 即使一個強有力的接口, 應該仔細地他使用為系統整體表現它被運用。 1.普遍連續公共汽車 USB 與RJ-45 或RJ-11 連接器是一小港相似被提供在個人電腦裡。許多類型設備可能被連接到個人電腦使用USB 。例如, 鍵盤、老鼠、掃描器, 指印掃描器等通常被連接到一個連續或並行端口能被連接到USB 。 USB 的更高的資料速率2.0 即480Mbps 開放連接下一代的可能性、更高的速度和更高的決議印表機和掃描器設備。USB 轉移信號和力量在一four-wire 纜繩依照被顯示在上圖1 。 信號發生二根導線。有二資料速率在USB 1.0 裡本身: 1 最高速度信號以12 Mbps 率。1 一個低速信號方式以1.5 Mbps 率 (Fig.1 USB 纜繩) 兩個方式可能由自動動態方式開關支持在同樣USB 公共汽車在調動之間。時鐘被傳送, 輸入與有差別的資料一起。SYNC 領域在各個小包之前允許接收器同步他們的位元補救時鐘。纜繩並且運載VBus 和GND 導線提供力量對外圍設備。Vbus 有名無實地是+5V 在來源。USB 允許可變長度的纜繩段, 由幾米決定, 由選擇適當的指揮測量儀匹配指定的IR 下落和其它屬性譬如設備電力預算和纜繩靈活性。 USB 插槽是可利用的和一般支持4 個USB 設備。他們是自己供電的和有裝備力量對所有流出下來口岸的地方電源。 如此USB 保留作為個人電腦的通信端口的在來年; 除規則外圍設備之外, 有起作用與USB 譬如衛星接收器為音像廣播的一些特別設備。噪聲問題被注意了在衛星接收器的功能評價期間, 使用USB 公共汽車。EMI 問題和可能的解答的細節被談論在本文裡。

  • 5 年前

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  • 匿名使用者
    6 年前

    我提供免費電腦問題諮詢:02-29405818

    我只要是~電腦維修~電腦重灌~電腦問題~修電腦~重灌win7~xp重灌~都是找他們

    他們到府服務非常方便!!

    希望能幫到你

    可以跟他們聯絡看看

    評價很高...你可以試試看!!^^

    電話:02-29405818

    或者加LINE~直接線上詢問也可以!

    ID:gmepc168

    希望能幫到你

    Yahoo服務加網址

    http://tw.serviceplus.yahoo.com/booth/seller/Y0193...

  • 匿名使用者
    6 年前

    我提供免費電腦問題諮詢:02-29405818

    我只要是~電腦維修~電腦重灌~電腦問題~修電腦~重灌win7~xp重灌~都是找他們

    他們到府服務非常方便!!

    或是加LINE因該會比較快唷!!~

    ID:gmepc168

    希望能幫到你

    可以跟他們聯絡看看

    評價很高...你可以試試看!!^^

    電話:02-29405818

    或者加LINE~直接線上詢問也可以!

    ID:gmepc168

    希望能幫到你

    http://tw.serviceplus.yahoo.com/booth/seller/Y0193...

  • 您覺得這個回答如何?您可以登入為回答投票。
  • 1 0 年前

    妳看不出來他是用眼睛醫生翻的嗎...

  • 2 0 年前

    真厲害阿...

  • DT
    Lv 7
    2 0 年前

    就是在講電腦USB的功能和原理和速率.

  • 2 0 年前

    好像是再講USB原理

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