您现在的位置是： 首页 > 数码产品 数码产品
microsoft band 2
zmhk 2024-05-21 人已围观
简介microsoft band 2 现在，请允许我来为大家分享一些关于microsoft band 2的相关知识，希望我的回答可以给大家带来一些启发。关于microsoft band 2的讨论，我们开始吧。1.asprepeat
现在，请允许我来为大家分享一些关于microsoft band 2的相关知识，希望我的回答可以给大家带来一些启发。关于microsoft band 2的讨论，我们开始吧。
1.asprepeater如何分页asp.netrepeater分页
2.sql语句帮助（高分悬赏）
3.如何安全删除或者卸载Norton Internet Security
4.求简单方便的写歌软件
5.急求一篇关于计算机用途的英语短文
6.移动端短语音消息音频格式选择
asprepeater如何分页asp.netrepeater分页
asp.net中的repeater简单分页其实网上有很多相关的信息。首先，写首页，例如
lblpc页面当前没有
页
跳到第一名
ddlp页
第二，实现后台分页。
个人页面数据源pds()
{
stringconnstring=configurationmanager。connectionstrings[pconn
数据集ds=新数据集()；
sqldataadaptersda=newsqldataadapter(选择*作者
sda。填充(ds，
sqldataadaptersda2=newsqldataadapter(select*fromtitle作者
sda2。填充(ds，
ds。关系。添加(名称au_id标题au_id
pageddatasourcePDS=newpageddatasource()；
pds。数据源=ds。表格[名称//单页上显示的项目数
pds。CurrentPageIndex=Convert。ToInt32(请求。querystring[页面
返回pds
}
受保护的voidRepeater1_ItemDataBound(对象发送方，RepeaterItemEventArgse)
{
if(e.item.itemtype==listitemtype。页脚)
{
DropDownListddlp=(DropDownList)e.item.findcontrol(ddlp
HyperLinkLPfirst=(HyperLink)e.item.findcontrol(hlfir
HyperLinkLPprev=(HyperLink)e.item.findcontrol(hlp
HyperLinklpnext=(HyperLink)e.item.findcontrol(hln
HyperLinkLPlast=(HyperLink)e.item.findcontrol(hlla
pds()。CurrentPageIndex=ddlp。SelectedIndex
intn=转换。ToInt32(pds()。pagecount)；//n是页数。
inti=Convert。ToInt32(pds()。CurrentPageIndex)；//i是当前页面。
Labellblpc=(Label)e.item.findcontrol(lblpc
lblpc。text=n.ToString()；
Labellblp=(Label)e.item.findcontrol(lblp
lblp。Text=转换。ToString(pds()。CurrentPageIndex1)；
如果(！IsPostBack)
{
for(intj=0；jj)
{
ddlp。Items.Add(转换。ToString(j1))；
}
}
如果(我
}
如果(i
}
lpfirst。NavigateUrl=//将参数页传递到此页
lplast。NavigateUrl=
ddlp。SelectedIndex=ConvertToInt32(pds()。CurrentPageIndex)；//更新下拉列表框中当前选中页面的序号。
}
}
受保护的voidddlp_SelectedIndexChanged(对象发送方，事件参数e)
{//当foot模板中的下拉列表框更改时激发。
字符串pg=Convert。ToString((Convert。ToInt32(((DropDownList)发送方)。selectedvalue)-1))；//获取列表框中当前选中的项目
回应。重定向(quotrepeate.aspx？page=//翻页
}
}
可能会很乱。请看putername计算机名
crack闯入
cryptanalysis密码分析
DLC数据链路控制
decryption解密
database数据库
dafaultroute缺省路由
dafaultshare缺省共享
denialofservice拒绝服务
dictionaryattack字典式攻击
directory目录
directoryreplication目录复制
domain域
domaincontroller域名控制器
domainname域名
DNS域名服务器
DDE动态数据交换
DHCP动态主机配置协议
encryption加密
EGP外部网关协议
FDDI光纤分布式数据接口
FAT文件分配表
FTP(FileTransferProtocol）文件传送协议
filter过滤器
firmware固件
flooding淹没
GSNWNetWare网关服务
GDI(graphicaldeviceinterface)图形设备界面
GUI图形用户界面
HTML超文本标记语言
HTTP超文本传送协议
IGP内部安全性
ICMP(InternetControlMessageProtocol)网际控制报文协议
IIS信息服务器
IP(InternetProtocol)网际协议
IRC网上交谈
ISP网络服务提供者
IPX互连网分组协议
IPC进程间通信
IRQ中断请求
IPaddressIP地址
IPmasqueradeIP伪装
IPspoofingIP欺骗
LAN局域网
LPC局部过程调用
NNTP网络新闻传送协议
PPP点到点协议
PDC主域控制器
Telnet远程登陆
TCP/IP传输控制协议/网际协议
TFTP碎片文件传送协议
TrojanHorse特洛伊木马
URL统一资源定位器
UDP用户数据报协议
VDM虚拟DOS机
WWW万维网
WAN广域网
virtualserver虚拟服务器
USERname用户名
USERaccount用户帐号
Webpage网页
OpenGL开放图形语言
ODBC开放数据库连接
PCI外设连接接口
authentication认证、鉴别
authorization授权
BackOfficeMicrosoft公司的一种软件包
Backup备份
backupbrowser后备浏览器
BDC备份域控制器
baseline基线
BIOS基本输入/输出系统
Binding联编、汇集
bit比特、二进制位
BOOTP引导协议
BGP引导网关协议
Bottleneck瓶径
bridge网桥、桥接器
browser浏览器
browsing浏览
channel信道、通路
CSU/DSU信道服务单元/数字服务单元
Checksum校验和
Cluster簇、群集
CGI公共网关接口
CD-ROM只读型光盘
Component组件
datalink数据链路
datagram数据报
defaultdocument缺省文档
digitalkeysystem数字键控系统
diskmirroring磁盘镜像
distributedfilesystem分布式文件系统
eavesdropping窃听、窃取
encryptedtunnel加密通道
enterprisenetwork企业网
Ethernet以太网
Externalsecurity外部安全性
environmentvariable环境变量
faxmodem传真猫
fileattribute文件属性
filesystem文件系统
file文件
form格式
fragments分段
framerelay桢中继
firewall防火墙
gateddaemongated进程（好象是一种早期的UNIX寻径服务）
gateway网关
globalaccount全局帐号
globalgroup全局组
group组
groupaccount组帐号
groupidentifier组标识符
hacker外国人叫黑客，我国叫"红客"
HCL硬件兼容性表
hash散表
HPFS高性能文件系统
Homedirectory主目录
homepage竹叶
hop驿站、中继段
host主机
hyperlink超文本链接
icon图标
impersonationattack伪装攻击
indexserver索引服务器
ISA工业标准结构
InherietedRightsFilter继承权限过滤器
ISDN综合业务数字网
interactiveuser交互性用户
intermediatesystem中介系统
internalsecurity内部安全性
InternetExplorer（IE）IBM的万维网浏览器
Internetserver因特网服务器
Interpreter解释程序
intranet内联网，企业内部网
intruder入侵者
JavaVirtualMachineJava虚拟机
JavaScript基于Java语言的一种脚本语言
kernel内核
keys密钥
keyspace密钥空间
LANServer局域网服务器
Localsecurity局部安全性
log日志、记录
logging登录
logoff退出、注销
logicalport逻辑端口
logon注册
logonscript登录脚本
LFN长文件名
massbrowser主浏览器
memberserver成员服务器
menu菜单
message消息
multilink多链接
MIME多媒体Internet邮件扩展
MPR多协议路由器
multiprocessing多重处理
Module模块
multihomedhost多穴主机
namedpipes命名管道
NDSNetWare目录服务
NetBEUINetBIOS扩展用户接口
NetBIOSgatewayNetBIOS网关
NetWare网络操作系统
network网络
NetBIOS网络基本热闹输入/输出系统
NDIS网络驱动程序接口规范
NetDDE网络动态数据交换
NIC网络接口卡
networklayer网络层
NetworkMonitor一个网络监控程序
networkoperatingsystem网络操作系统
networkprinter网络打印机
networksecurity网络安全
networkuser网络用户
NFS网络文件系统
node节点
OSPF开放最短路径优先协议
OSIModel开放系统互连模式
out-of-bandattack带外攻击
packetfilter分组过滤器
password口令
path路径
payload净负荷
PBX专用交换机
PCS个人通信业务
peer对等
permission权限
plaintext明文
PPTP点到点隧道协议
port端口
prority优先权
protocol协议
potentialbrowser潜在浏览器
process进程
proxy代理
proxyserver代理服务器
paseudorandom伪随机
RAS远程访问服务
Remotecontrol远程控制
RPC远程过程调用
remoteboot远程引导
route路由
router路由器
routing路由选择
RIP路由选择信息协议
routeddaemon一种利用RIP的UNIX寻径服务
routingtable路由表
R.U.P路由更新协议
script脚本
searchengine搜索引擎
SSL安全套接层
secure密码
SID安全标识符
sender发送者
SLIP串行线网际协议
server服务器
server-basednetwork基于服务器的网络
sessionlayer会话层
share共享
share-levelsecurity共享级安全性
SMTP简单邮件传送协议
SNMP简单网络管理协议
Site站点
SCSI小型计算机系统接口
snffer检错器
snooping探听
standaloneserver独立服务器
strongcipher强密码
streamcipher流密码
strongpassword强口令
SQL结构化查询语言
subnetmask子网掩码
subdirectory子目录
subnet子网
swapfile交换文件
SACL系统访问控制表
T0,DS056或者64kbps
T1,DS124路PCM数字话，总速率为1.544Mbps
T3,DS328个T1信道，作品能够速率为44.736Mbps
thinclient瘦客户机
thread线程
throughput吞吐量
transportlayer传输量
TransportProtocol传输协议
trust信任
tunnel安全加密链路
vectorofattack攻击向量
Virtualdirectory虚目录
VirtualMachine虚拟机
VRML虚拟现实模型语言
volume文件集
vulnerability脆弱性
weakpasswurd弱口令
well-knownports通用端口
workstation工作站
X.25一种分组交换网协议
zonetransfer区域转换
sql语句帮助（高分悬赏）
CSR 103:9
1. CSR 103:9 Intro
2. Guy - Groove Me
3. Today - I Got The Feeling
4. Bobby Brown - Don't Be Cruel
5. En Vogue - My Lovin' (Never Gonna Get It)
6. Wrecks-N-Effect - New Jack Swing
7. Boyz II Men - Motownphilly
8. You're On CSR 103:9
9. Bell Biv DeVoe - Poison
10. Samuelle - So You Like What You See
11. SWV - I'm So Into You
12. Aaron Hall - Don't Be Afraid
13. Ralph Tresvant - Sensitivity
14. That Was CSR 103:9
15. Renegade Cologne
16. The Epsilon Program: Covet
K-JAH West
1. K-Jah Intro
2. Max Romeo & The Upsetters - Chase The Devil
3. Barrington Levy - Here I Come
4. Black Uhuru - Great Train Robbery
5. Blood Sisters - Ring My Bell
6. Toots & The Maytals - Funky Kingston
7. Augustus Pablo - King Tubby Meets The Rockers Uptown
8. You're On K-Jah
9. Pliers - Bam Bam
10. Dillinger - Cocaine in My Brain
11. Black Harmony - Don't Let It go To Your Head
12. Reggie Stepper - Drum Pan Sound
13. The Maytals - Pressure Drop
14. That Was K-Jah
15. Sooth Cough Medicine
16. Wrestling On Weazel
K-DST
1. K-DST Intro
2. Heart - Barracuda
3. Kiss - Strutter
4. Boston - Smokin'
5. Grand Funk Railroad - Some Kind of Wonderful
6. Joe Cocker - Woman To Woman
7. Humble Pie - Get Down To It
8. You're On K-Dst
9. America- A Horse With No Name
10. The Who - Eminence Front
11. Lynyrd Skynyrd - Free Bird
12. Eddie Money - Two Tickets To Paradise
13. Rod Stewart - Young Turks
14. That Was K-DST
15. Midlife Crisis Center
16. San Andreas Telephone: New Father
Radio X
1. Radio X Intro
2. Soundgarden - Rusty Cage
3. Helmet - Unsung
4. Faith No More - Midlife Crisis
5. Stone Temple Pilots - Plush
6. Rage Against The Machine - Killing In The Name
7. You're On Radio X
8. Living Colour - Cult Of Personality
9. Danzig - Mother
10. Depeche Mode - Personal Jesus
11. Jane's Addiction - Been Caught Stealing
12. L7 - Pretend We're Dead
13. That Was Radio X
14. My Five Uncles
15. Exsorbeo Handheld Gaming System
如何安全删除或者卸载Norton Internet Security
api(application programming interfaces，应用程序接口)
ascii(american standard code for information interchange，美国国家标准信息交换代码)
atl: activex template library(activex模板库)
basic:beginner's all-purpose symbolic instruction code(初学者通用指令代码)
com: component object model(组件对象模式)
dna: distributed internet application(分布式因特网应用程序)
mfc: microsoft foundation classes(微软基础类库)
sdk(software development kit，软件开发工具包)
windows
ce(consumer electronics，消费电子)
dcom: distributing component object model，构造物体模块
dhcp: dynamic host configuration protocol，动态主机分配协议
dmf: distribution media format
gdi(graphics device interface，图形设备接口)
gui(graphics user interface，图形用户界面)
gpf(general protect fault，一般保护性错误)
hta: hypertext application，超文本应用程序
inf file(information file，信息文件)
ini file(initialization file，初始化文件)
ndis: network driver interface specification，网络驱动程序接口规范
nt(new technology，新技术)
qos: quality of service，服务质量
rrvp: resource reservation protocol(资源保留协议)
rtos(real time operating systems，实时操作系统)
sbfs: simple boot flag specification，简单引导标记规范
vefat: virtual file allocation table(虚拟文件分配表)
(vxd，virtual device drivers，虚拟设备驱动程序)
wdm(windows driver model，视窗驱动程序模块)
winsock: windows socket，视窗套接口
whql: windows hardware quality labs，windows硬件质量实验室
whs: windows Xing host，视窗脚本程序
zam: zero administration for windows，零管理视窗系统
加密
ecc: elliptic curve crypto(椭圆曲线加密)
set: secure electronic transaction(安全电子交易)
语言
css: cascading style sheets，层叠格式表
dcd: X content deXion for xml: xml文件内容描述
dtd: X type definition，文件类型定义
html(hypertext markup language，超文本标记语言)
jvm: X virtual machine, X虚拟机
oji: open X vm interface，开放X虚拟机接口
sgml: standard generalized markup language，标准通用标记语言
smil: synchronous multimedia integrate language(同步多媒体集成语言)
vrml：virtual reality makeup language，虚拟现实结构化语言
vxml(voice extensible markup language，语音扩展标记语言)
xml: extensible markup language(可扩展标记语言)
xsl: extensible style sheet language(可扩展设计语言)
adimm(advanced dual in-line memory modules，高级双重内嵌式内存模块)
amr(audio／modem riser；音效／调制解调器主机板附加直立插卡)
aha(accelerated hub architecture，加速中心架构)
ask ir(amplitude shift keyed infra-red，长波形可移动输入红外线)
atx: at extend(扩展型at)
bios(basic input/output system，基本输入/输出系统)
cse(configuration space enable，可分配空间)
db: device bay，设备插架
dmi(desktop management interface，桌面管理接口)
eb(expansion bus，扩展总线)
eisa(enhanced industry standard architecture，增强形工业标准架构)
emi(electromagnetic interference，电磁干扰)
escd(extended system configuration data，可扩展系统配置数据)
fbc(frame buffer cache，帧缓冲缓存)
firewire(火线，即ieee1394标准)
fsb: front side bus，前置总线，即外部总线
fwh( firmware hub，固件中心)
gmch(graphics & memory controller hub，图形和内存控制中心)
gpis(general purpose inputs，普通操作输入)
ich(input/output controller hub，输入/输出控制中心)
ir(infrared ray，红外线)
irda(infrared ray，红外线通信接口可进行局域网存取和文件共享)
isa: industry standard architecture，工业标准架构
isa(instruction set architecture，工业设置架构)
mdc(mobile daughter card，移动式子卡)
mrh-r(memory repeater hub，内存数据处理中心)
mrh-s(sdram repeater hub，sdram数据处理中心)
mth(memory transfer hub，内存转换中心)
ngio(next generation input/output，新一代输入/输出标准)
p64h(64-bit pci controller hub，64位pci控制中心)
pcb(printed circuit board，印刷电路板)
pcba(printed circuit board assembly，印刷电路板装配)
pci: peripheral component interconnect，互连外围设备
pci sig(peripheral component interconnect special interest group，互连外围设备专业组)
post(power on self test，加电自测试)
rng(random number generator，随机数字发生器)
rtc: real time clock(实时时钟)
kbc(keybroad control，键盘控制器)
sap(sideband address port，边带寻址端口)
sba(side band addressing，边带寻址)
sma: share memory architecture，共享内存结构
std(suspend to disk，磁盘唤醒)
str(suspend to ram，内存唤醒)
svr: switching voltage regulator(交换式电压调节)
usb(universal serial bus，通用串行总线)
usdm(unified system diagnostic manager，统一系统监测管理器)
vid(voltage identification definition，电压识别认证)
vrm (voltage regulator module，电压调整模块)
zif: zero insertion force， 零插力
主板技术
gigabyte
acops: automatic cpu overheat prevention system(cpu过热预防系统)
siv: system information viewer(系统信息观察)
磐英
esdj(easy setting dual jumper，简化cpu双重跳线法)
浩鑫
upt(usb、panel、link、tv-out四重接口)
芯片组
acpi(advanced configuration and power interface，先进设置和电源管理)
agp(accelerated graphics port，图形加速接口)
i/o(input/output，输入/输出)
mioc: memory and i/o bridge controller，内存和i/o桥控制器
nbc: north bridge chip(北桥芯片)
piix: pci isa/ide accelerator(加速器)
pse36: page size extension 36－bit，36位页面尺寸扩展模式
pxb: pci expander bridge，pci增强桥
rcg: ras/cas generator，ras/cas发生器
sbc: south bridge chip(南桥芯片)
smb: system management bus(全系统管理总线)
spd(serial presence detect，内存内部序号检测装置)
ssb: super south bridge，超级南桥芯片
tdp: triton data path(数据路径)
tsc: triton system controller(系统控制器)
qpa: quad port acceleration(四接口加速)
3dnow!(3d no waiting)
alu(arithmetic logic unit，算术逻辑单元)
agu(address generation units，地址产成单元)
bga(ball grid array，球状矩阵排列)
bht(branch prediction table，分支预测表)
bpu(branch processing unit，分支处理单元)
brach pediction(分支预测)
cmos: complementary metal oxide semiconductor，互补金属氧化物半导体
cisc(complex instruction set computing，复杂指令集计算机)
clk(clock cycle，时钟周期)
cob(cache on board，板上集成缓存)
cod(cache on die，芯片内集成缓存)
cpga(ceramic pin grid array，陶瓷针型栅格阵列)
cpu(center processing unit，中央处理器)
data forwarding(数据前送)
decode(指令解码)
dib(dual independent bus，双独立总线)
ec(embedded controller，嵌入式控制器)
embedded chips(嵌入式)
epic(explicitly parallel instruction code，并行指令代码)
fadd(floationg point addition，浮点加)
fcpga(flip chip pin grid array，反转芯片针脚栅格阵列)
fdiv(floationg point divide，浮点除)
femms：fast entry/exit multimedia state，快速进入/退出多媒体状态
fft(fast fourier transform，快速热欧姆转换)
fid(fid：frequency identify，频率鉴别号码)
fifo(first input first output，先入先出队列)
flip-chip(芯片反转)
flop(floating point operations per second，浮点操作/秒)
fmul(floationg point multiplication，浮点乘)
fpu(float point unit，浮点运算单元)
fsub(floationg point subtraction，浮点减)
gvpp(generic visual perception processor，常规视觉处理器)
hl-pbga: 表面黏著，高耐热、轻薄型塑胶球状矩阵封装
ia(intel architecture，英特尔架构)
icu(instruction control unit，指令控制单元)
id：identify，鉴别号码
idf(intel developer forum，英特尔开发者论坛)
ieu(integer execution units，整数执行单元)
imm: intel mobile module， 英特尔移动模块
instructions cache，指令缓存
instruction coloring(指令分类)
ipc(instructions per clock cycle，指令/时钟周期)
isa(instruction set architecture，指令集架构)
kni(katmai new instructions，katmai新指令集，即sse)
latency(潜伏期)
ldt(lightning data transport，闪电数据传输总线)
local interconnect(局域互连)
mesi(modified， exclusive， shared， invalid：修改、排除、共享、废弃)
mmx(multimedia extensions，多媒体扩展指令集)
mmu(multimedia unit，多媒体单元)
mflops(million floationg point/second，每秒百万个浮点操作)
mhz(million hertz，兆赫兹)
mp(multi-processing，多重处理器架构)
mps(multiprocessor specification，多重处理器规范)
msrs(model-specific registers，特别模块寄存器)
naoc(no-account overclock，无效超频)
ni：non－intel，非英特尔
olga(organic land grid array，基板栅格阵列)
ooo(out of order，乱序执行)
pga: pin-grid array(引脚网格阵列)，耗电大
post-risc
pr(performance rate，性能比率)
psn(processor serial numbers，处理器序列号)
pib(processor in a box，盒装处理器)
ppga(plastic pin grid array，塑胶针状矩阵封装)
pqfp(plastic quad flat package，塑料方块平面封装)
raw(read after write，写后读)
register contention(抢占寄存器)
register pressure(寄存器不足)
register renaming(寄存器重命名)
remark(芯片频率重标识)
resource contention(资源冲突)
retirement(指令引退)
risc(reduced instruction set computing，精简指令集计算机)
sec: single edge connector，单边连接器
shallow-trench isolation(浅槽隔离)
simd(single instruction multiple data，单指令多数据流)
sio2f(fluorided silicon oxide，二氧氟化硅)
smi(system management interrupt，系统管理中断)
smm(system management mode，系统管理模式)
smp(symmetric multi-processing，对称式多重处理架构)
soi: silicon-on-insulator，绝缘体硅片
sonc(system on a chip，系统集成芯片)
spec(system performance evaluation corporation，系统性能评估测试)
sqrt(square root calculations，平方根计算)
sse(streaming simd extensions，单一指令多数据流扩展)
superscalar(超标量体系结构)
tcp: tape carrier package(薄膜封装)，发热小
throughput(吞吐量)
tlb(translate look side buffers，翻译旁视缓冲器)
uswc(uncacheabled speculative write combination，无缓冲随机联合写操作)
valu(vector arithmetic logic unit，向量算术逻辑单元)
vliw(very long instruction word，超长指令字)
vpu(vector permutate unit，向量排列单元)
vpu(vector processing units，向量处理单元，即处理mmx、sse等simd指令的地方)
library 库,程序库
linkage 连接
to load 装入,寄存,写入,加载
location 存储单元
logger 登记器,记录器
loop 循环
machine language 机器语言
magnetic storage 磁存储器
magnetic tape 磁带
matrix 矩阵
memory 存储器
message 信息,报文
microcomputer 微型计算机
module 组件,模块
monitor 监视器,监督程序,管程
nanosecond 毫微秒
network 网络,网
numeric, numerical 数字的,数值的
octet 八位位组,八位字节
operator 操作员
optical character reader 光符阅读机
optical scanner 光扫描器
output 输出
overflow 溢出,上溢
panel 平板
parameter 参数,参量
perforator 穿孔机
peripheral equipment 外围设备,外部设备
personal computer 个人计算机
printed circuit 印制电路
printer 打印机
printout 打印输出
to process 处理
processing unit 处理部件
program 程序
to program 程序编制
programmer 程序设计员
programming 程序设计,程序编制
pulse 脉冲
punch 穿孔
to punch 穿孔
punched card, punch card 穿孔卡片
punched tape, punch tape 穿孔纸带
punch hole 孔,穿孔
random access 随机存取
to read 读
reader 阅读程序
reading 阅读
real time 实时
record, register 记录
redundancy 冗余
routine 例行程序
selector 选择器,选择符
sentinel 标记
sequence 序列,顺序
sequential 顺序的
serial 串行的.连续的
shift 移位,移数
signal 信号
simulation 模拟
simulator 模拟器,模拟程序
software 软件,软设备
sort 分类,排序
sorter 分类人员,分类机,分类程序,排序程序
storage 存储器
to store 存储
subroutine, subprogram 子程序
switch 开关
symbol 符号
symbolic language 符号语言
system 系统
tabulator 制表机
teleprinter 电传打字机
terminal 终端
terminal unit 终端设备
timer 时钟,精密计时器
time sharing 分时
timing 定时
track 磁道
transducer 传感器,翻译机
translator 翻译程序,翻译器
to update 更新
Winchester disk drive 温彻斯特磁盘机,硬盘机
working storage 工作存储器
c2c: card-to-card interleaving，卡到卡交错存取
cc-numa(cache-coherent non uniform memory access，连贯缓冲非统一内存寻址)
chrp(common hardware reference platform，共用硬件平台，ibm为powerpc制定的标准，可以兼容mac os, windows nt, solaris, os/2, linux和aix等多种操作系统)
emp: emergency management port，紧急事件管理端口
icmb: inter-chassis management bus, 内部管理总线
mpp(massive parallel processing，巨量平行处理架构)
mux: data path multiplexor，多重路径数据访问
求简单方便的写歌软件
1、首先打开电脑，然后单击开始菜单中的“齿轮”图标。2、然后在打开的设置页面中，找到并点击“应用“。
3、在左侧栏选择应用程序和功能，右边单击“可选功能”。
4、然后在打开的可选功能页面里，点击“ Internet Explorer”。
5、最后点击“卸载”，这样就完成了Internet Explorer的卸载（删除）。
急求一篇关于计算机用途的英语短文
1、musescore。是一个用于Linux、Microsoft Windows和Mac的乐谱编辑软件。MuseScore是一个所见即所得的编辑器，完全支持乐谱播放和导入或导出MusicXML和标准的MIDI文件；
2、band in a box。对于初学者来说，Band in a Box是挺好的参照物，尤其是爵士风格，其中很多的Voicing、licks和节奏都十分经典，可以帮助初学者更快地掌握爵士的技术；
3、overture。它上手容易，功能强大。常用功能主要包括：在五线谱中输入和编辑音符和各种记号，按照较高规范度和整洁度调整谱面，用图解窗口制作各种高级音效，将MIDI格式的文件导入软件进行五线谱的编辑，用VST音色插件以交响乐级别播放乐谱，将制作出来的五线谱导出为MIDI音频文件或PDF格式的文档等。
移动端短语音消息音频格式选择
Internet Virus Spreads 网络病毒的传播
Experts on cyberspace say the much feared code red computer 1)worm continues to spread through the internet. But so far, the electronic bug that was being considered a global threat to internet 2)traffic seems to have had little 3)impact.
No significant disruptions to traffic on the web have been reported since the code red bug was 4)unleashed early Wednesday. But experts warn the threat may be far from over. Bill Jones, the spokesman of California's Keynote Systems, the company which helps businesses with e-commerce ‘I haven’t said anything so far that we call unusual, but we certainly would… But the FBI says the code red worm is still spreading and has the potential to infect internet sites and cause 5)significant disruption to traffic on the world wide web.
"I would expect that the worm has probably not run its course. I would think that because it is a 6)geometric progression, as it infects machines and they infect other machines, you have the opportunity to see a slowdown over time. To have expected something immediately at 0000 UTC Wednesday I think was 7)unrealistic but over the next 24 hours and next few days we could certainly see a slowdown."
Last month, the worm attacked more than 350,000 computer systems running on Microsoft operating systems - including the White House website - and prompted the Pentagon to shut down sites then as well. But it seems that the advice issued by the FBI and cyber industry leaders for internet users to take precautions may have paid off. So far, more than a million people have downloaded a so-called 8)patch from Microsoft's website that prevents computers from being infected.
注释：
(1) worm [w:m] n.虫, 蠕虫
(2) traffic [5trAfIk] n.交通, 通行, 运输, 贸易, 交通量, 交易, 交往, 通信量
(3) impact [5ImpAkt] n.碰撞, 冲击, 冲突, 影响vt.撞击, 压紧, 对...发生影响
(4) unleash [Qn5li:F] v.释放
(5) significant [sI^5nIfEkEnt] adj.有意义的, 重大的, 重要的
(6) geometric progression n.[数]等比级数
(7) unrealistic [QnrIE5lIstIk] adj.不切实际的, 不实在的
(8) patch [pAtF] n.修补程序
转载的~~~~~
还有几个
Compter Networks
Modem networking applications require a sophisticated approach to carrying data from one machine to another. If you are managing a machine that has many users, each of whom may wish to simultaneously connect to remote hosts on a network, you need a way of allow-in them to share your network connection without interfering with each otherf~3. The approach that a large number of modern networking protocols use is called packet switching. A packet is a small chunk of data that is transferred from one machine to another across the network. The switching occurs as the datagram is carried across each link in the network. A packet-switched network shares a single network link among many users by alternately send-in packets from one user to another across that link.
When talking about TCP/IP networks you will hear the term datagram, which technical-lye has a special meaning but is often used interchangeably with packetE2~. In this section, we will have a look at underlying concepts of the TCP/IP protocols.
TCP/IP traces its origins to a research project funded by the United States Defense Ad-Vance Research Projects Agency (DARPA) in 1969. The ARPANET was an experimental network that was converted into an operational one in 1975 after it had proven to be a success.
In 1983, the new protocol suite TCP/IP was adopted as a standard, and all hosts on the network were required to use it. When ARPANET finally grew into the internet (with ARPANET itself passing out of existence in 1990), the use of TCP/IP had spread to net-works beyond the Intermit itself. Many companies have now built corporate TCP/IP net-works, and the Intermit has grown to a point at which it could almost be considered a main-stream consumer technology. It is difficult to read a newspaper or magazine now without see-in/reference to the Internet; almost everyone can now use it.
Another very important application in TCP/IP networks is NFS, which stands for Net-work File System. It is another form of making the network transparent, because it basically allows you to treat directory hierarchies from other hosts as if they were local file systems and look like any other directories on your hostc3J . For example, all users' home directories can be kept on a central server machine from which all other hosts on the LAN can mount them. The effect is that users can login to any machine and find themselves in the same home directory, Similarly, it is possible to share large amounts of data(such as database, documentation programs)among many hosts by maintaining one copy of the data on a server and allowing other hosts to access it.
Of course, these are only examples of what you can do with TCP/IP networks. We will now have a closer look at the way TCP/IP works. This information will help you understand how and why you have to configure your machine.
The World Wide Web is a hypertext-based system for finding and accessing Internet resources; it is a set of programs, standards, and protocols governing the way in which multimedia files are created and displayed on the Internet. It can provide access to a variety of Internet resources from the same interface ,including FTP, Gopher and Usenet newsgroups in addition to WWW sites.
作者： 218.200.247.* 2006-2-26 14:31 回复此发言
--------------------------------------------------------------------------------
2 计算机方面的英语资料，介绍一些计算机的英语短文，有兴趣的可以看
The World Wide Web is a distributed, multimedia and hypertext system, and thus a unique medium for communication and for publishing.
Documents for the WWW are written in HTML. The term is used to describe an interlinked system of documents in which a user may jump from one document to another in a nonlinear, associative way. The ability to jump from one document to the next is made possible through the use of hyperlinks. By click the hyperlink, the user is immediately connected to the document specified by the link. Multimedia files on the Internet are called hypermedia documents.
The explosion in use and popularity of Internet in the 1990s is most likely due to the graphics-intensive nature of the World Wide Web. Individuals, companies, and institutions use the Web in many ways. The most widely used tool on the Web is electronic mail, or E-mail, which is used to send written messages between individuals or groups of individuals, often geographically separated by large distances. As a very convenient and inexpensive way to transmit messages, E-mail has dramatically affected scientific, personal, and business communications.
World Wide Web has found application everywhere. E-commerce (business via the Internet) has grown out of businesses that started to advertise their presence via a Web site.
This has broadened into selling products and services, not only to customers but between businesses themselves. The costs of commercial transactions are negligible, compared with using the traditional distribution and retail network. What is more revolutionary is that the Web can lead to greater political involvement in decision making for ordinary people, via devoting systems.
Web technology has also been extended to handle conferencing and real time communications, to enable it to act like groupware, which facilitates people collaborating over a net-work, especially over an Intranet. The future of the World Wide Web is certain; it will survive and grow. What is uncertain is how it will affect other areas of everyday life.
Wireless Access System ( I )
With its advantages including the short construction period, dispensability with the laying of conduits and capability of both data and voice transmission, wireless access can partly or even entirely substitute for wire accessE13 . It is widely used by telecom carriers, which provide voice service largely, and newly emerging Internet service providers (ISPs) and potential local access providers as welled~ . The WA systems used in China have the following six types in terms of frequency bands used.
1. 450/460 MHz WA System: This system finds wide application in rural areas, re-mote suburbs, remote mountainous areas and islands. Some years ago, in order to achieve the objective of making every village accessible to telephone service, the Ministry of Posts and Telecommunications (MPT) extensively used WA systems of this frequency band, pro-mooting the rapid growth of the segments concerned TM . A dozen of manufacturers such ashamed, TCL and Dating produced such systems. However, since these are used mainly in rural areas, their economic efficiency is not as good as is expected. After China Telecom became an independent accounting unit, the development of WA service of this band began to slow down and face fierce competition. This band will not be reallocated; the government encourages telecom carriers to use it for rural communications.
作者： 218.200.247.* 2006-2-26 14:31 回复此发言
--------------------------------------------------------------------------------
3 计算机方面的英语资料，介绍一些计算机的英语短文，有兴趣的可以看
2. 1800 MHz WA System: This system uses 1800 - 1805 MHz and is based on TDD
modulation. Now only the S-CDMA WA systems developed by Dating and deployed in many
places (like Changing) by China Telecom use this band. Owing to the fact that Internet access and mobile terminals are not yet to be introduced, the growth of the relevant services impeded. Moreover, this band may possibly be withdrawn for the purpose of 3G generation mobile communications.
3. 1900 MHz WA System: This system is either based on FDD or TDD. The FDD-
based system uses 1880 ~ 1900 MHz/1960 ~ 1980MHz. It adopts CDMA, GSM and PACS.
Since these bands are inconsistent with those designated by the ITU for the use of 3G mobile
communications, in accordance with the regulations of the Radio Regulatory Bureau of theme, they can be used only in Beijing, Tianjin, Shanghai, Guangzhou, Shenzhen, Xiamen,Fuzhou,Chengdu and Chongqing by the year 2002 and will be withdrawn and reallocated after that.
The TDD-based WA system uses 1900~1920 MHZ and falls into two types: mobile and fixed. The mobile system, which adopts either PHS or DECT technology, is well known as the radio telephone and mobile phone. The TDD-based fixed WA system uses 1907~1915MHZ and both the CDMA/TDMA modulation modes. Now shanghai Bell produces Israel’s Beta-2000 system. This system is used in Ningxia province and part of Hunan province
Wireless Access System(Ⅱ)
4.Spread Spectrum WA System: This system uses 2400~2483.5MHZ/5725~5825MHZ and either direct spread spectrum modulation or hopping frequency spread spectrum modulation. It can be a normal point-to-point and point-to-multipoint spread spectrum data communications system or a wireless local area network(LAN), providing an emission power no more than 100 mw. The wireless LAN, also known as the wireless network bridge and wireless router , is mainly used for short-distance wireless data access to the Internet. With a directional antenna, the normal wireless spread spectrum data communications system provides a relatively long-distance transmission up to 5~10 kilometers. However, there being quite a lot of illegal systems in use within this frequency band, the electro-magnetic environment Is getting worse and interference occurs frequently. This has affected the further development of spread spectrum WA.
5. 3,5 MHz WA System: This system uses 3400 ~ 3430MHz/3500 - 3530MHz, ma-
inlay for midland and broadband WA. In view of the fact that the extended C-band for satellite communications also uses this band, and taking into account the potential trend of satellite communications, the 3.5 MHz WA is planned to use temporarily the frequencies of the2 x 30 MHz bandwidth. WA of this band is widely used in Europe whereas in the United States it is not open yet. Considering the limited frequency range that has been planned, theta -based WA system cannot use this band for the time being. It is estimated that each city or area can only accommodate a couple of WA operators eventually though many operators have made demand for the band. It is expected that the related frequency allocation and commercial experiments will be carried out in the first half of the year 2001.
6. Broadband WA: As demand for broadband services increases, recent years have seen the strong growth of broadband WA. People generally refer to the local multipoint distribution system (LMDS) as the broadband WA system. Because of its wide bandwidth, its frequencies can only be arranged in a higher band, which allows a short distance.
Generally speaking, because of its good propagation characteristics, the WA system un-deer 1000 MHz is suitable for rural areas, remote suburbs, mountainous areas and islands withal high cost of cable installation, a low teledensity and complex topography. The WA system above 1000 MHz can also serve as a means of installing telephone lines soon. Lacking for re-lasted global unified standards, the WA system is not able to provide roaming. So it is important to encourage the selection of appropriate technologies and systems for different subscribers in different areas and environments. Different WA systems may use different bands flexibly provided that they do not interfere with the operation of existing radio services.
1. 移动端原生音频支持
1.1 android Supported media formats
/guide/topics/media/media-formats
Format / CodecEncoderDecoderDetailsSupported File Type(s) / Container Formats
AAC LC?Support for mono/stereo/5.0/5.1 content with standard sampling rates from 8 to 48 kHz.? 3GPP (.3gp)
? MPEG-4 (.mp4, .m4a)
? ADTS raw AAC (.aac, decode in Android 3.1+, encode in Android 4.0+, ADIF not supported)
? MPEG-TS (.ts, not seekable, Android 3.0+)
HE-AACv1 (AAC+)?
(Android 4.1+)
?
HE-AACv2 (enhanced AAC+)?Support for stereo/5.0/5.1 content with standard sampling rates from 8 to 48 kHz.
AAC ELD (enhanced low delay AAC)?
(Android 4.1+)
?
(Android 4.1+)
Support for mono/stereo content with standard sampling rates from 16 to 48 kHz
AMR-NB?4.75 to 12.2 kbps sampled @ 8kHz3GPP (.3gp)
AMR-WB?9 rates from 6.60 kbit/s to 23.85 kbit/s sampled @ 16kHz3GPP (.3gp)
FLAC?
(Android 4.1+)
?
(Android 3.1+)
Mono/Stereo (no multichannel). Sample rates up to 48 kHz (but up to 44.1 kHz is recommended on devices with 44.1 kHz output, as the 48 to 44.1 kHz downsampler does not include a low-pass filter). 16-bit recommended; no dither applied for 24-bit.FLAC (.flac) only
MIDI?MIDI Type 0 and 1. DLS Version 1 and 2. XMF and Mobile XMF. Support for ringtone formats RTTTL/RTX, OTA, and iMelody? Type 0 and 1 (.mid, .xmf, .mxmf)
? RTTTL/RTX (.rtttl, .rtx)
? OTA (.ota)
? iMelody (.imy)
MP3?Mono/Stereo 8-320Kbps constant (CBR) or variable bit-rate (VBR)MP3 (.mp3)
Opus?
(Android 5.0+)
Matroska (.mkv)
PCM/WAVE?
(Android 4.1+)
?8- and 16-bit linear PCM (rates up to limit of hardware). Sampling rates for raw PCM recordings at 8000, 16000 and 44100 Hz.WAVE (.wav)
Vorbis? Ogg (.ogg)
? Matroska (.mkv, Android 4.0+)
1.2 Supported Audio File and Data Formats in OS X
/library/content/documentation/MusicAudio/Conceptual/CoreAudioOverview/SupportedAudioFormatsMacOSX/SupportedAudioFormatsMacOSX.html
Allowable data formats for each file format.
File FormatData Formats
AAC (.aac, .adts)'aac '
AC3 (.ac3)'ac-3'
AIFC (.aif, .aiff,.aifc)BEI8, BEI16, BEI24, BEI32, BEF32, BEF64, 'ulaw', 'alaw', 'MAC3', 'MAC6', 'ima4' , 'QDMC', 'QDM2', 'Qclp', 'agsm'
AIFF (.aiff)BEI8, BEI16, BEI24, BEI32
Apple Core Audio Format (.caf)'.mp3', 'MAC3', 'MAC6', 'QDM2', 'QDMC', 'Qclp', 'Qclq', 'aac ', 'agsm', 'alac', 'alaw', 'drms', 'dvi ', 'ima4', 'lpc ', BEI8, BEI16, BEI24,BEI32, BEF32, BEF64, LEI16, LEI24, LEI32, LEF32, LEF64, 'ms\x00\x02', 'ms\x00\x11', 'ms\x001', 'ms\x00U', 'ms \x00', 'samr', 'ulaw'
MPEG Layer 3 (.mp3)'.mp3'
MPEG 4 Audio (.mp4)'aac '
MPEG 4 Audio (.m4a)'aac ', alac'
NeXT/Sun Audio (.snd, .au)BEI8, BEI16, BEI24, BEI32, BEF32, BEF64, 'ulaw'
Sound Designer II (.sd2)BEI8, BEI16, BEI24, BEI32
WAVE (.wav)LEUI8, LEI16, LEI24, LEI32, LEF32, LEF64, 'ulaw', 'alaw'
Core Audio includes a number of audio codecs that translate audio data to and from Linear PCM. Codecs for the following audio data type are available in OS X v10.4. Audio applications may install additional encoders and decoders.
Audio data typeEncode from linear PCM?Decode to linear PCM?
MPEG Layer 3 ('.mp3')NoYes
MACE 3:1 ('MAC3')YesYes
MACE 6:1 ('MAC6')YesYes
QDesign Music 2 ('QDM2')YesYes
QDesign ('QDMC')NoYes
Qualcomm PureVoice ('Qclp')YesYes
Qualcomm QCELP ('qclq')NoYes
AAC ('aac ')YesYes
Apple Lossless ('alac')YesYes
Apple GSM 10:1 ('agsm')NoYes
ALaw 2:1 'alaw')YesYes
Apple DRM Audio Decoder ('drms')NoYes
AC-3NoNo
DVI 4:1 ('dvi ')NoYes
Apple IMA 4:1 ('ima4')YesYes
LPC 23:1 ('lpc ')NoYes
Microsoft ADPCMNoYes
DVI ADPCMYesYes
GSM610NoYes
AMR Narrowband ('samr')YesYes
?Law 2:1 ('ulaw')YesYes
1.3 总结:
android/ios都可以对mp3解码,但不能编码,编码依赖lame;
android/ios支持对aac进行编解码;
mp3,aac均是音乐编码器,android支持对amr窄带与宽带编解码,ios文档显示对窄带支持编解码,但有人说ios4.3.x版本之后不再支持AMR，剔除了AMR的硬解,如需使用依赖libopencore库;
结论:
h5 audio标签对mp3支持最好(audio标签除了firefox与opera都支持mp3,ogg,wav;flash播放器可以支持到mp3,aac,speex,nellymoser),考虑对纯web的兼容性,使用mp3;
android,ios硬件对aac支持最好,考虑硬编码的性能与效率,使用aac;
amr是语音编码器,考虑使用场景,推荐amr.
对比微信,微信短语音,6.0之前用的amr,6.0之后用的silk_v3.
2.音频基础概念
2.1声音三要素
声音的特性可由三个要素来描述，即响度、音调和音色。
响度：人耳对声音强弱的主观感觉称为响度。响度和声波振动的幅度有关。一般说来，声波振动幅度越大则响度也越大。当我们用较大的力量敲鼓时，鼓膜振动的幅度大，发出的声音响；轻轻敲鼓时，鼓膜振动的幅度小，发出的声音弱。音叉振动时发出的声波为单音，即只有一个频率成分。若设法将音叉的振动规律记录下来，可发现其振动波形为一正弦波。当用不同力量敲击某个音叉时，音叉发出的声波幅度不同，这意味着声音的响度不同。给出了两个声音波形，其幅度一大一小，幅度大的波形其声音响度大，幅度小的波形其声音响度小。另外，人们对响度的感觉还和声波的频率有关，同样强度的声波，如果其频率不同，人耳感觉到的响度也不同。
音调：人耳对声音高低的感觉称为音调。音调主要与声波的频率有关。声波的频率高，则音调也高。当我们分别敲击一个小鼓和一个大鼓时，会感觉它们所发出的声音不同。小鼓被敲击后振动频率快，发出的声音比较清脆，即音调较高；而大鼓被敲击后振动频率较慢，发出的声音比较低沉，即音调较低。如果分别敲击一个小音叉和一个大音叉时，同样会感觉到小音叉所发声音的音调较高，大音叉所发声音音调较低。如果设法把大、小音叉所发出的声波记录下来，可发现小音叉在单位时间内振动的次数多，即频率高，大音叉在单位时间内振动的次数少，即频率低。给出了两个频率不同的声音波形，从声音可听出，频率高的声音波形听起来音调较高，而频率低的声音波形听起来则音调较低。
音色：音色是人们区别具有同样响度、同样音调的两个声音之所以不同的特性，或者说是人耳对各种频率、各种强度的声波的综合反应。音色与声波的振动波形有关，或者说与声音的频谱结构有关。前面说过，音叉可产生一个单一频率的声波，其波形为正弦波。但实际上人们在自然界中听到的绝大部分声音都具有非常复杂的波形，这些波形由基波和多种谐波构成。谐波的多少和强弱构成了不同的音色。各种发声物体在发出同一音调声音时，其基波成分相同。但由于谐波的多少不同，并且各次谐波的幅度各异，因而产生了不同的音色。例如当我们听胡琴和扬琴等乐器同奏一个曲子时，虽然它们的音调相同，但我们却能把不同乐器的声音区别开来。这是因为，各种乐器的发音材料和结构不同，它们发出同一个音调的声音时，虽然基波相同，但谐波构成不同，因此产生的波形不同，从而造成音色不同。给出了小提琴和钢琴的波形和声音，这两个声音的响度和音调都是相同的，但听起来却不一样，这就是因为这两个声音的音色不同（波形不同）。
2.2采样率和采样大小
声音其实是一种能量波，因此也有频率和振幅的特征，频率对应于时间轴线，振幅对应于电平轴线。波是无限光滑的，弦线可以看成由无数点组成，由于存储空间是相对有限的，数字编码过程中，必须对弦线的点进行采样。采样的过程就是抽取某点的频率值，很显然，在一秒中内抽取的点越多，获取得频率信息更丰富，**为了复原波形，一次振动中，必须有2个点的采样**，人耳能够感觉到的最高频率为20kHz，因此要满足人耳的听觉要求，则需要至少每秒进行40k次采样，用40kHz表达，这个40kHz就是采样率。我们常见的CD，采样率为44.1kHz。光有频率信息是不够的，我们还必须获得该频率的能量值并量化，用于表示信号强度。量化电平数为2的整数次幂，我们常见的CD位16bit的采样大小，即2的16次方。采样大小相对采样率更难理解，因为要显得抽象点，举个简单例子：假设对一个波进行8次采样，采样点分别对应的能量值分别为A1-A8，但我们只使用2bit的采样大小，结果我们只能保留A1-A8中4个点的值而舍弃另外4个。如果我们进行3bit的采样大小，则刚好记录下8个点的所有信息。采样率和采样大小的值越大，记录的波形更接近原始信号。
2.3有损和无损
根据采样率和采样大小可以得知，相对自然界的信号，音频编码最多只能做到无限接近，至少目前的技术只能这样了，相对自然界的信号，任何数字音频编码方案都是有损的，因为无法完全还原。在计算机应用中，能够达到最高保真水平的就是PCM编码，被广泛用于素材保存及音乐欣赏，CD、DVD以及我们常见的WAV文件中均有应用。因此，PCM约定俗成了无损编码，因为PCM代表了数字音频中最佳的保真水准，并不意味着PCM就能够确保信号绝对保真，PCM也只能做到最大程度的无限接近。我们而习惯性的把MP3列入有损音频编码范畴，是相对PCM编码的。强调编码的相对性的有损和无损，是为了告诉大家，要做到真正的无损是困难的，就像用数字去表达圆周率，不管精度多高，也只是无限接近，而不是真正等于圆周率的值。
2.4频率与采样率的关系
采样率表示了每秒对原始信号采样的次数，我们常见到的音频文件采样率多为44.1KHz，这意味着什么呢？假设我们有2段正弦波信号，分别为20Hz和20KHz，长度均为一秒钟，以对应我们能听到的最低频和最高频，分别对这两段信号进行40KHz的采样，我们可以得到一个什么样的结果呢？结果是：20Hz的信号每次振动被采样了40K/20=2000次，而20K的信号每次振动只有2次采样。显然，在相同的采样率下，记录低频的信息远比高频的详细。这也是为什么有些音响发烧友指责CD有数码声不够真实的原因，CD的44.1KHz采样也无法保证高频信号被较好记录。要较好的记录高频信号，看来需要更高的采样率，于是有些朋友在捕捉CD音轨的时候使用48KHz的采样率，这是不可取的！这其实对音质没有任何好处，对抓轨软件来说，保持和CD提供的44.1KHz一样的采样率才是最佳音质的保证之一，而不是去提高它。较高的采样率只有相对模拟信号的时候才有用，如果被采样的信号是数字的，请不要去尝试提高采样率。
亨利·奈奎斯特(Harry Nyquist)采样定理:当对连续变化的信号波形进行采样时,若采样率fs高于该信号所含最高频率的两倍,那么可以由采样值通过插补技术正确的回复原信号中的波形,否则将会引起频谱混叠(Aliasing),产生混叠噪音(Aliasing Noise),而重叠的部分是不能恢复的.(同样适用于模拟视频信号的采样)
根据人声语音的特点,人类的听力感知范围是从20Hz到20kHz。这个频宽范围被划分成四个频宽类别：窄带、宽带、超宽带和全带。
窄带（narrowband）普通电话所覆盖的频宽，从300Hz到3.4kHz，对应采样率6.8kHz。普通电话的采样率是8kHz，对应频宽4kHz，对于人声语音是足够的。
宽带（wideband）从50Hz到7kH的频宽，对应采样率14khz，可以很好地捕捉和还原人声，然而对于音乐声还是不够的。这是在人声语音通话场景下的所谓高清语音。
超宽带（super-wideband）从50Hz到14kHz，对应采样率28kHz，基本可以覆盖人声和音乐声，对于非专业音乐人的用户来说，不管是人声通话还是音乐直播，这样的频宽都是足够的。
全带（fullband）从20Hz到20kHz，对应40kHz采样率，全面覆盖人类的听觉范围，能够满足音乐发烧友或者专业音乐人的需求。超过40Hz都可以称作全带语音。CD的采样率就是44.1kHz。
因此，窄带(narrowband)的音质是能满足人声录制回放的。
从四个角度衡量音频编码:
成本:开发成本,服务器流量成本
音质:
系统影响:对系统资源的暂用,软编解码器比硬编解码器占用更多cpu
兼容性:对移动端以及web端的兼容
适合产品场景的编码器具备以下四个特点
码率相对低，满足成本可控的要求，一般不要超过16kbps。一个sample用1bit就能编好，那么8kHz采样率（narrowband）对应8kbps的码率，16kHz采样率（wideband）对应16kbps的码率。码率的本质就是成本。
算法复杂度要比较低，对系统CPU、内存和电量消耗少，对系统影响要尽量低。
音质可以适当作出牺牲，以保障上面三个因素，8kHz采样率对人声场景是够用的，16kHz采样率可以提供高清语音。
兼顾兼容性
3.主流音频编码器
音频编码格式的比较: /library/content/referencelibrary/GettingStarted/GS_MusicAudio/_index.html
2.Opus ios: /chrisballinger/Opus-iOS
3.android opus: /axet/android-opus
4.opus_android: /louisyonge/opus_android
5.opuscodec: /martoreto/opuscodec
6.与大家讨论如何用opencore amr在iOS上decode: /library/archive/documentation/MusicAudio/Conceptual/CoreAudioOverview/CoreAudioEssentials/CoreAudioEssentials.html#//apple_ref/doc/uid/TP40003577-CH10-SW13
好了，今天关于“microsoft band 2”的话题就讲到这里了。希望大家能够通过我的讲解对“microsoft band 2”有更全面、深入的了解，并且能够在今后的学习中更好地运用所学知识。
