z*****n
发帖数: 7639 | 1 Question1:
the sampler works at 100kHz. Then for the double sideband
signal with compressed carrier at 50kHz, the lower sideband
will pass through, the higer sideband will be regarded as
alias of lower one. So the effect is that the lower sideband
is doubled in amplitude. And this is the largest coefficient,
so the coefficents for the signal below 20kHz will be 1/2=0.5
this includes the DC gain.
忙.
sub-
second |
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f***r
发帖数: 5548 | 2 哪一个DSB？
DSB Double Strand Break
DSB Dispute Settlement Body (World Trade Organization)
DSB Defense Science Board (US DoD)
DSB Deutscher Sportbund (German Sports Association)
DSB Deep Sand Bed
DSB Double Sideband
DSB Danske Statsbaner
DSB Double-Sideband
DSB Division of Services for the Blind
DSB Dictionary of Scientific Biography
DSB Democrats for Strong Bulgaria (political party)
DSB Direktoratet for Samfunnsikkerhet Og Beredskap (Norway: Directorate
for Civi |
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F*********n
发帖数: 52 | 3 呵呵，问题解决了。基本上就是基带I和Q的waveform一样，然后输出有90度相移就是
single sideband modulation了。也就是BPSK可以做single sideband,但QPSK,QAM肯定
不是了。还是安捷伦的App Note和公司的老鸟比较容易得到答案啊！ |
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l*b
发帖数: 4369 | 4 如果不需要高bandwidth的话，AOM就能搞定。
需要高bandwidth的话，EOM的sideband也可以。carrier的频率虽然不好调，sideband的随便调啊。把modulation depth搞得高一点，把carrier的能量压到10%以下，再搞个窄带滤波器（比如filter cavity），基本上搞定吧。 |
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c***s
发帖数: 70028 | 5 @方舟子：真搞，搜狐找了一帮以前被我揭露过的大学校长、学者来力挺贺卫方，其中居然还有复旦大学校长杨玉良。下次贺卫方和杨玉良见面道谢的时候，要不要代我问问，杨校长当年谎称获得德国莱布尼茨大奖一事被举报，处理结果怎么样了？
附：复旦大学校长杨玉良的第一桶金（2009-10-10 02:42:52）
（作者：方舟子）【严正声明：根据武汉肖氏法院肖国雄、余文庆、刘辉、鲁林等法官的裁定，特此通告该文被批评者：方舟子夫妇早已约定财产归各自所有，不得因此派遣当地法官到北京窃取方舟子妻子的合法财产。】
今年年初，中国科学院院士杨玉良转正当上了复旦大学的校长。杨校长的发迹，源于他在复旦大学获得博士学位后，曾于1986-1988年间到德国马普高分子研究所做博士后，1988年“载誉”回到复旦大学。上海《杨浦区志》将其载入了史册：
“1952年出生的青年学者杨玉良，在高分子凝聚态物理和高分子液晶显示材料研究中，有突破性进展，1988年获得联邦德国Leibniz大奖，1990年被评为国家‘做出突出贡献的中国博士学位获得者’和1991年上海市十大科技精英之一。”
http://www.shtong.gov.cn/... 阅读全帖 |
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w*********g
发帖数: 30882 | 6 Un-White America: Will Blacks and Hispanics lead the USA to ruin
http://www.theburningplatform.com/?p=40398
I think ol’ Fred may be on to something here. Does that make me a racist?
========================
I begin to weary of the endless denunciations of “white privilege;” the
calls to end the dominance of malignant white men; the law suits to abolish
all tests on which white men excel, meaning almost any test of mental
ability; to make universities and police forces and advanced-placement
clas... 阅读全帖 |
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w********2
发帖数: 632 | 7 Baseboard Management Controllers (BMCs) are a type of embedded computer used
to provide out-of-band monitoring for desktops and servers. These products
are sold under many brand names, including HP iLO, Dell DRAC, Sun ILOM,
Fujitsu iRMC, IBM IMM, and Supermicro IPMI. BMCs are often implemented as
embedded ARM systems, running Linux and connected directly to the
southbridge of the host system's motherboard. Network access is obtained
either via 'sideband' access to an existing network card or thr... 阅读全帖 |
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s*********r
发帖数: 9493 | 8 SS
维基百科，自由的百科全书
SS可能是指下列意思之一：
纳粹德国的党卫队
世嘉土星游戏机
潜水艇的简称
孙燕姿 （Staphine Sun）
一种衡量水质的指标：悬浮固体物质（Suspended Substance）
SupeSite，中国康盛创想所研发的内容管理系统
韶山系列机车
影子前锋：Second Striker，足球场上球员位置缩写
SS小燕之夜
WRC中的特殊赛段：Special Stage
生长抑素：somatostatin，一种典型的脑肠肽
Super sport 的简写，如Camaro SS 指运动型超跑车
Speed Symbol 的简写，速度等级。
不锈钢：stainless steel。
sample size 式样尺寸，样品规格
single sideband 单边带
single source 单来源
social security 社会保障
solid state 固态，固体
汽船：steamship
超音速：supersonic
suspended sentence 【律】缓刑
ß有时写成SS，参见ss
棒球中的守备位置之一游击手（Shor... 阅读全帖 |
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p*******f
发帖数: 521 | 9 你这也太极端了.
那种情况下, 机器的I/O早就不行了.
查了一下,引用如下:
The effect of jitter is difficult to quantify, but its presence gives the
impression of loss of instrument definition, narrowing of stereo image,
collapse of soundstage depth, etc.
Jitter is more apparent in higher frequencies than lower frequencies. If it
is periodic rather than random, it has an effect similar to 'flutter.' For a
given test tone, it will produce sidebands equal to the jitter frequency.
While the level of this distortion is low, it can st... 阅读全帖 |
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b*s
发帖数: 82482 | 10 国内啊。这里dxing整得更fancy, single sideband啥的，器材很牛掰 |
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e**a
发帖数: 109 | 12 我们的final exam里的.很多概念都不懂(找不到老师答疑,他也经常不来上课,从没有
solution).
可能很多人觉得题目简单,但是老师从来没说过,我们的参考书上也找不到,请大家帮忙.
明天考试.谢谢!
A comosite audio signal is sample at 100KHz. In addition to the audio
confined to the frequency band 0Hz through 20KHz, it contains a digital sub-
carrier centered at 50KHz with a double sideband supperessed carrier, second
audio signal with two-sided bandwidth 20KHz.
1. Estimate the DC gain of the filter if its largest coeffieient has been
normalized to unity. |
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z*****n
发帖数: 7639 | 13 In 802.11b one channel is defined as 5Mhz bandwidth, and
working at 2400-2483Mhz ISM band.
But due to the modulation sideband, a 20Mhz seperation is
necessary. So at most 3 channels can be used at the
same place.
802.11g uses OFDM, and one channel is 20MHz, just
back-compatible with 11b. |
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d*****l
发帖数: 8441 | 15 有这样的光通讯系统吗？
能否实现线性调频？如何解调？
sideband的随便调啊。把modulation depth搞得高一点，把carrier的能量压到10%以下
，再搞个窄带滤波器（比如filter cavity），基本上搞定吧。 |
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