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m****a
发帖数: 132 | 2 【 以下文字转载自 EE 讨论区 】
发信人: muitta (muitta), 信区: EE
标 题: question on: Gaussian vs. uniform noise
发信站: BBS 未名空间站 (Wed Aug 1 22:06:15 2007)
想请教一下信号处理方面的问题。现有一些采样数据，如果在这些数据中加入Gaussian
或 Uniform 分布的噪声，然后再作 DCT 变换。假设这两种不同分布的噪声的平均值
以及方差都相同的化，请问它们对 DCT 的影响会有什么不同？ |
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t*****o
发帖数: 74 | 3 Try to do some simulation about cooling effect and noise of cpu fan ......
Anyone work on the same project?
Need some suggestion on how to start it ...
Thanks a lot! |
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s********d
发帖数: 36 | 4 Nonlinear dynamic system characterization and identification
Noise and vibration control through system-based interaction
Structural health monitoring and prognostics
是不是这些很多靠军口？
大概知道是做什么的 那么就业前景如何呢？
Bow～ |
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z****g
发帖数: 1978 | 5 what do you mean?
GARCH model deals with volatility, not the noise itself.
Do you mean the dynamic of volatility? If so, clearly not, since volatility
is always positive. |
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y******g
发帖数: 41 | 6 thanks for the responses.I would clarify my understandings here then:
AR model
= linear combination of lagged data (can be seen as the conditional mean) +
white noise
ARCH assumes:
yt = conditional mean (which is seen as the prediction at the time) +
prediction error
and prediction error follows an ARCH if it is a linear combination of
prediction errors of past and their variances
I figure ACF talks about the autocorrelation among lagged data, which can
form the base of assuming the conditional |
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c****u
发帖数: 584 | 7
In W.Harrison's book Applied Quantum Mechanis. Also Mode Coupling Theory
by Gotze shows 1/f noise at higher order singularities.
Nonliner feedback+Non Markovian process+perturbative expansion
Hu |
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f*******i
发帖数: 8492 | 8 谢谢指点
但是这个公式就是paper里给的
我括号里的i和t实际上就是角标
而且，我现在的问题是，我知道这个问题不能用regression做
所以，如果想在sas里，实现一一对应，求得noise，应该怎么操作呢？ |
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p*******r
发帖数: 1951 | 9 为什么by year?
"A对于每个公司，每年都有一个值，而B则是每年一个值"
如果by company by year，那就是一个x一个y做regression。。。
你这个题目给的公式显然是by company不by year。noise就是regression 的error
term。 |
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n*******e
发帖数: 3141 | 10 LR里，sharpening 提高一点，noise就会增加，反之亦然。这两个东西完全就是对立面
啊，不可能搞的既很sharp又不太grainy的。这样理解对不对？ |
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k*****e
发帖数: 22013 | 11 首先原片质量要好，用低iso拍，降低噪音，这样就可以大胆地sharpen
如果原片不怎么好，可以用参数组合找折衷方案，
我通常sharpen力度不会调太高，把radius调稍高一些，
可以避免过度强调噪声，又会有sharp的视觉感受。
原理是噪声通常比较细小，而我们要强调的线条则比较粗，
空间频率稍有不同。
最后一招，手工局部sharpen，只sharp眼睛嘴角头发等地，
对脸部皮肤，背景等地该光滑的地方就用noise reduction. |
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p*****y
发帖数: 1602 | 12 My car has similar whistle noise as in this video.
http://www.youtube.com/watch?v=dm8VM6RFnF8
The man said 'A 6 inch long crack in the head top side middle of the head.'
Anyone knows what it means? |
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D******y
发帖数: 3780 | 13 2004 CRV, the squeaking noise happens when there is a fast left turn.
what's the possible cause? Bad CV joint?
thanks |
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w*******y
发帖数: 60932 | 14 Walmart
Jawbone Prime Noise Assassin Blue Tooth Headset (black)
$39
shipped
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w*******y
发帖数: 60932 | 16 Noise Isolating In Ear Earphone, Headphone, Earbud for MP3 MP4 iPod PSP NDS
, 3.5mm, Dark Blue $0.69 (Item#254-136-001) $0.69 w/Coupon Code:
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w*******y
发帖数: 60932 | 17 New Altec Lansing MHP126 MUZX Series 3.5mm In-Ear Earphones, Comfortable
SnugFit, Noise-Isolating, Powerful 9 mm Neodymium Speakers
LINK:
http://www.dailysteals.com/
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w*******y
发帖数: 60932 | 19 Buy.com
Altec Lansing AHS322 Semi Open Headset w/ Noise Canceling Mic
= $6.99 with free shipping
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w*******y
发帖数: 60932 | 21 Airlink101 Wireless 11N Mini USB Adapter for PC and MAC, Penny Size 802.11n
Draft 2.0 Adapter, 300Mbps Downloading, AWLL6075, 1T2R, Windows 7 64bit and
32bit - $9.99
Coupon Code :MLCK2162440 92742NL1 Starts On : 9/27/2010 5:00:00 AM limit
300 uses
Link:
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Noise Isolating In Ear Earphone, Headphone, Earbud for MP3 MP4 iPod PSP NDS,
3.5mm, Black with White, 0843 - $0.69
Coupon Code :MLCK2541720 92774NL |
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w*******y
发帖数: 60932 | 22 For those who missed the $61 dollar deal last month, this is back. Ultimate
Ears SuperFi 5vi Noise Isolating Earphones w/ Mic. $64.99 @Amazon FSSS. Link
Below. I know it is 4 dollars more expensive but still a great deal. The
SuperFi 5's without mic is $95.50
LINK TO AMAZON:
http://www.amazon.com/gp/product/B001DERZK0/ref=oss_product
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w*******y
发帖数: 60932 | 23 FREE! 2-Pack: Plantronics MHS213 Noise Isolating Stereo Mobile Headset With
Microphone
Link:
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w*******y
发帖数: 60932 | 32 Tigerdirect has Klipsch 1012134 ProMedia High-Performance All-Media Noise
Isolating In-ear Headphones - Microphone, iPhone Compatible for 59.99 use
coupon code OKL16588 to get $30 off. Standard Shipping is $1.99. Tax applies
in few states.
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w*******y
发帖数: 60932 | 34 Logitech
Logitech Ultimate Ears SuperFi 4 Noise-Isolating Earphones
$29.99 with code superfi4_22511
free shipping
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w*******y
发帖数: 60932 | 36 Newegg
back again if you missed out on last times deal
Meelectronics M9P-BK Noise-Isolating 3.5mm Headset with Control talk (black)
= $10 with code EMCKGKB97
free shipping
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w*******y
发帖数: 60932 | 39 Lenovo
Lenovo P950 Noise Cancelling Headset
$29.99 - $20 code USPC11JL16605
= $9.99 with free shipping
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w*******y
发帖数: 60932 | 45 Newegg
MEElectronics M9P-BK Noise-Isolating 3.5mm Headset with Control Talk (black)
= $9.99 with code EMCJKKF96
free shipping
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w*******y
发帖数: 60932 | 48 Newegg
MEElectronics SX-31-BK 3.5mm Connector Canal Noise-Sealing Earbud
= $4.99 with code EMCJKJG69
free shipping
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