f*****g
发帖数: 30 | 1 I think it is a theoretical tool to deal with colored (spatially correlated)
noise. After the filter, the noise is white and all existing results based
on white-noise assumption can be applied.
In a real implementation, I don't think such filter is necessary. Noise
whitening will be achieved automatically as part of the MMSE optimization
process. However, there may be practical benefits (such as dynamical range)
in using a separate filter. I don't know much about those issues. |
|
b******y
发帖数: 107 | 2 Hi all,
I have some questions about the phase distortion of filter.
For a linear phase filter, if it has phase response phi =-k* omega where
omega is the frequency . Its group delay (the neg derivitive of phi to omega
)and phase delay (the neg of phi divided by omega) are both k. There is no
phase distortion among frequencies.
If phi = -k*omega +c. The group delay is still k and it is still called
linear phase filter. However its phase delay is not a constant. Will it has
phase distortion among |
|
L****a
发帖数: 572 | 3 matlab has filter design toolbox. If it's FIR, you get zeros of the filters
by using matlab's filter design function. then put into Z polynomial, then it's
a polynomial representation of impulse response. isn't that curve fitting
of impulse response ? |
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j***u
发帖数: 26 | 4 我作了一个low pass filter, 我用一个PMOS作bias current, PMOS differential
input pair和NMOS active load作出一个简单的one stage amplifier，然后把ouput接
到negative input端,unity negative feedback,就形成了一个voltage follower。然
后我在output端和gnd间接了一个capacitor.模拟结果给出了output的dc average 和
input dc average有大概10mV的电压差。
可是我同时用NMOS differential pair和PMOS active load作了一个相对应的filter，
模拟结果显示这个output和input的dc average几乎相等，实际测量出的dc offset也得
有10mV多，说明transistor model应该是比较ideal的。
所以使我困惑的是，那个PMOS input pair的filter，为啥模拟结果就已经有10mV的dc
offset了呢？如果output |
|
s**********s
发帖数: 47 | 5 try Google "notch filter" or "band-stop filter". I did a notch to filter out
60Hz years ago.
Good luck. |
|
b*******2
发帖数: 2121 | 6 本来想自己做一个,发现效果不好,bandwidth不够窄,noise太大;
后来网上找了些IC chip filter,竟然都没有卖的,厂家也不做了..
基本要求:
bandpass filter, as narrow as possible, center freq about 1kHz, 最好可调.
发现基本都没人卖这个freqency的了.
请达人推荐一个可用的啊!
泪流满面包子答谢! |
|
c****o
发帖数: 49 | 7 what happens is ur filter is operating on high sample rate, so coefs will
not converge... filter taps = (80/22)*fs/f_transition. conclusion is, boy u
need to do sth smart |
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u***l
发帖数: 2 | 8 In OFDM transmitter, the modulated symbols need to be pulse shaped before
transmitting. I built a filter in Matlab2013a using
d = fdesign.pulseshaping(16,'Raised Cosine', 'Ast,Beta', 60, 0.3);
H = design(d);
fvtool(H);
In previous Matlab version, a function can be used both for filter design
and apply to IFFTed symbol data:
rcosflt(subcarriers, 1, 20, 'fir',0.4,10)
However in 2013a version, I couldn't find information to apply this filter
to IFFTed symbol data. Does anybody know how to do it?
Th... 阅读全帖 |
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d********e
发帖数: 30 | 9 【 以下文字转载自 Statistics 讨论区 】
发信人: diphontine (Hello World), 信区: Statistics
标 题: Looking for help on Kalman Filter and/or VAR $20/hr OBO
发信站: BBS 未名空间站 (Thu Oct 13 22:33:01 2011, 美东)
I am looking for someone to give me some intuition about Kalman Filter and/
or Vector Auto Regression face-to-face. I live in Manhattan during the week
and Southern Jersey (Monmouth/Ocean County) over weekend.
I have an undergrad in Math (mostly number theory and combinatorics) and phd
in computer science. I am look... 阅读全帖 |
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b*******g
发帖数: 1309 | 10 it is hard，大的particle 会堵塞 filter，导致小的也过不去
当然如果大的是200nm以上，小的是2nm还是可以考虑的，用filter的，直接用
millipore的0.22um filter 就OK |
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w**********y
发帖数: 1691 | 11 不要浪费时间去用过度复杂的model，model永远不是做出策略的最关键部分。
如果你这个idea能用,甚至都不需要用Kalman Filter,更用不着partical filter这些了
.
你要去想想kalman filter比linear regression增加的是什么feature. 而这些feature
实际应用的时候,你都可以用linear regression和选定local window和lookback
period去近似.
所以,唯一的建议,从linear regression开始做. 看看你做的过程中有哪些错误和观察
你上面说的transformation,没大看懂.如果你是 20*y = b*20*(x-1) + e
那你去交易你的spread当然能挣钱了. 你这样算出的spread已经被你人为加上drift了.
not tradable. |
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C******g
发帖数: 2930 | 12 Can you spot the difference between the four Katamari Damacy Tribute images
seen above? All four pictures showcase a different visual filter used in the
game, and according to Siliconera, this change in art style and appearance
can be adjusted by the player. The four filters are: classic, colored pencil
, wood grain and cel-shaded.
Now, the question is: Which image corresponds to the right filter? We could
just tell you, but we thought you'd have more fun playing a guessing game.
So which one is |
|
t****z
发帖数: 229 | 13 完全匹配的filter wrench 也没用，根本吃不上劲，因为filter尾端的橡胶都被拧变形
了（fram的那种）。估计上次换油的人根本就没拧下来所以也就没换。
自己弄的话还有什么办法吗？或者弄到车铺去他们有什么办法？
是02年focus，filter的位置还特别别扭，得从oil pan 往上伸好多才能够到，基本只
能单手操作。 |
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p*********e
发帖数: 32207 | 14 ☆─────────────────────────────────────☆
itanium (itanium) 于 (Mon Oct 6 10:02:01 2008) 提到:
上次是oil drain plug没拧动，今天搞了个socket wrench一次就动了就把油放了，
结果再试图去手拧oil filter的时候，硬是拧不动了，上次明明手已经拧动了松了的，
都看到油冒出来了
现在只好只换了油，没有换filter......
请教各位达人，这个手拧有什么技巧么？是热的时候拧还是冷的时候拧省力，手是只握
oil filter朝外底部还是根部省力？
tian6869,你有没专用扳手借我啊、、、、
现在是不是即使拧动了，之前换的油也要会漏很多出来？
☆─────────────────────────────────────☆
yoh (海豚) 于 (Mon Oct 6 10:08:48 2008) 提到:
没有扳手可以用锋利的螺丝刀在上面戳俩洞，就能很容易拧下来了。
☆─────────────────────────────────────☆
it |
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F******p
发帖数: 2099 | 15 用filter wrentch根本拧不动filter,反复查看了，拧松的方向是正确的，有没有更好
更强大的松filter的工具？ |
|
H*******d
发帖数: 2394 | 16 原来囤的purolator还有一堆没用呢。
买了filter还得找单独oil的deal，但很多都是和filter一起的deal
说实在话，还是那种filter加机油的bundle deal省心点，价格也差不了多少。 |
|
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w*******y
发帖数: 60932 | 18 Buy 3 ($9.99) Hepa Filters and get a Holmes Odor Grabber with HEPA-type
Filter FREE ($29.99) PLUS Free Shipping on the ORDER.
My total was:
3 Filters = $29.97 ($9.99 each)
1 OdorGrabber unit = $29.99 (will be the free unit)
My shipping = $7.99
My tax = $2.92 |
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w*******y
发帖数: 60932 | 19 I just left my local NAPA parts store and was surprised to see the NAPA Gold
oil filters were on sale 2 for $10. Normally my oil filter costs $7 plus
tax. With the sale, I decided to get 4 filters, total was $21.40 with tax.
It looks like this has been going on for the month of August, so only a
couple of days left.
|
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w*******y
发帖数: 60932 | 20 Get a FREE Filtrete Water Bottle or Filter when you fill a very short survey!
Link:
http://filtrete.com/watersurvey
The Filtrete Fast Flow Filter is a replacement filter for the Fast Flow
Pitcher...
The Filtrete Water Bottle can be used stand alone...
So if you don't already OWN the FFF-Pitcher...get the Water Bottle.
|
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w*******y
发帖数: 60932 | 21 Canon 50mm f 1.8 II lens & Tiffen 52mm UV Glass Filter shipped for $94.83
Here is the link for the lens
Link:
http://www.jr.com/canon/pe/CAN_50MM_SL_1_dot_8/#productTabDetails
#productTabDetails" rel="nofollow" target="_blank" onclick="try{pageTracker.
_trackEvent('thread', 'click', '2241495 - canon-50mmf1.8-lens-&-tiffen-52mm-
uv-glass-filter-$94.83');} catch(err) {return true;}">http://www.jr.com/canon/pe/CAN_50...bD etails
Add to the cart, click on the Accessories tab, and add the filter.
On |
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w*******y
发帖数: 60932 | 22 Canon Rebel XS 10.1MP Digital SLR Camera with 18-55mm IS & 55-250mm IS
Lenses + Tiffen 58mm UV Filter$965
$506.99 Free Shipping After Coupon & Rebate at Amazon.com posted about 2
hours ago
Use Amazon.com coupon code 5525OOCT during checkout.
Amazon is offering the lowest price we can find anywhere on this bundle.
Just the camera alone sells for $549.99 at Buy.com. If Amazon is not pre-
selected when you click through, look under more buying choices. Follow the
directions below to get this dea... 阅读全帖 |
|
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|
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w*******y
发帖数: 60932 | 26 MSR MiniWorks EX Microfilter:
http://www.amazon.com/gp/product/B000BBF2RY
for $48.94 on Amazon. Normal retail is $89.95.
The MiniWorks EX microfilter is MSR's worldwide best-selling microfilter,
delivering long-lasting, field-maintainable water filtration in demanding
environments. Engineered for frequent and heavy use, it utilizes the company
's workhorse Marathon EX carbon/ceramic element to ensure clean, reliable,
and taste-free water. to its innovative AirSpring Accumulator, it's capable
... 阅读全帖 |
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w*******y
发帖数: 60932 | 27 Hello everyone,
I found a decent priced Dolica DSLR combo kit for $64.99 on Costo.com. This
is good if your looking for a WT-1003 monopod, DK-20 camera backpack/
slingbg, and CF-K58 filter kit. The monopod is a decent sized at 67" and
able to hold most DSLRs. The backpack sling bag is useful for hold a camera,
lens, filters, flashes and even the monopod. The 58mm filter kit is
suitable for most kit lens included the Canon T2i kit with 18-55mm.
Seperately combined this is around $90 so at $65 thi... 阅读全帖 |
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w*******y
发帖数: 60932 | 28 Amazon has a great deal on Whirlpool 4396841P PUR Push Button Side-by-Side
Refrigerator Water Filter, 2-Pack. The price is $35.59 after 20% discount.
The discount is automatically applied during checkout.
linky:
http://www.amazon.com/gp/product/B003BEY63Y/ref=ox_sc_act_title
The 20% discount applies to other filters as well but the price is not as
low as this one.
With my luck I bought these exact filters a week ago for $45.
|
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w*******y
发帖数: 60932 | 29 Maytag UKF8001 Pur Refrigerator Cyst Water Filter 1-Pack
28% off plus 15% subscribe n save total $27.37
Link:
http://www.amazon.com/Maytag-UKF8001-Refrigerator-Filter-1-Pack
free shipping and prime ok!
This model (UKF8001) can be used to replace the following models of water
filter:
UKF8001AXX
67003523
67003526
67003527
67003528
12589203
12589206
12589208
12589210
13040216
13040216N
UKF9001
|
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w*******y
发帖数: 60932 | 30 ----------------------------------------------------------------------------
-----------------------------------------------
Kmart has the 3 pack of Brita filters on sale for $10 - Using stacking codes
you can save another 19% for a Final Price of $8.10 - jsharp20 for the
stacking codes
----------------------------------------------------------------------------
-----------------------------------------------
Brita Pitcher Replacement Filters, 3 filters:
http://www.kmart.com/shc/s/p_10151_10104... 阅读全帖 |
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w*******y
发帖数: 60932 | 31 Ah.... my first (I hope). Been on here for years and always get beat to it,
but I haven't seen this one yet.
Autozone has the following promotion going on till April 1st.
MOTORCYCLE OIL CHANGE SPECIAL
4 Single Qts. and a Fram Motorcycle Oil Filter*
Choose from Mobil 1, Castrol, or Valvoline Synthetic
for $34.99. Normally I buy Mobil 1 for about $10 a quart. So that's a 12.5
percent savings + the free oil filter. I never see this stuff on sale so I
stocked up with 8 qts and two filters. Good dea... 阅读全帖 |
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a***a
发帖数: 40617 | 32 【 以下文字转载自 PhotoGear 讨论区 】
发信人: anoia (阿诺,不能再这么烧器材了,痛定思痛), 信区: PhotoGear
标 题: RRS plate and Lee filter system minireview
发信站: BBS 未名空间站 (Wed Jan 16 05:40:31 2008), 转信
大图请看
http://www.pbase.com/anoia/for_pentax_67ii
RRS B68 plate for pentax 67II
Lee speical 100mm push-on filter holder system
RRS的板子最大的问题如图所示，板子的底部太厚，导致卡在arca-style的clamp上时
无法严丝合缝，有很大空袭，也增加了同一个clmap跟不同plate之间通用性匹配的难度。
好像这是RRS板子的普遍问题。
Lee speical 100mm push-on filter holder system.是专门为几个中大幅面的95mm口径
广角头设计。最大的好处就是不会有暗角和遮挡的问题。无须任何adpate |
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b*****e
发帖数: 819 | 33 I checked my maintenance history, they changed the cabin air filter, but
never changed
the engin air filter...
I have 34k now, maybe time to change the air filter myself. |
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B*****R
发帖数: 1539 | 34 yes, I guess that is the "internal" filter they call. that's covered by the
maintenance plan. I'm not sure the schedule to replace that. but the cabin
air filter, which is the "external" filter, will be changed in every oil
service. |
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d******a
发帖数: 32122 | 35 【 以下文字转载自 USANews 讨论区 】
发信人: helloterran (hi you), 信区: USANews
标 题: 彻底屏蔽老大爷，推荐chrome插件，mitbbs fake post filter，
发信站: BBS 未名空间站 (Thu Sep 22 13:42:28 2016, 美东)
这是我用的filter list
withoutacar,addadd9,addadd9999,arklin,banshees,BCQ,CalCat,cliffmudd,CNM100,
coldstar,comeandgo,CornucopiaX,dalihe102,DeDelong,evereve,fuckthrust,gshjj,
guagua520,haibugui,jfsrjjoz,juanxi,lana1972,lastheaven,ldy,lordmanor,
lovesunny123,LR106,Mayingba,mynight,Narcissus26,PBSNPR,pingxing,pta,qpz,
quovadis,Remote01,ridgway,sap... 阅读全帖 |
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F*****d
发帖数: 2848 | 36 口罩已断货两个月，走投无路的美国人民纷纷哄抢heater filter，将filter套在头上
抵御病毒。 |
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v*****n
发帖数: 621 | 37 相比那些老牛们，我写这个手记就相当幼稚可笑了。但是对于自己无疑还是
一个令人兴奋的起点。老破车从前两个月开始就开始MPG明显下降，点火发动
的时候发抖和噪音都很厉害。另外，加速性能也明显下降。但是一来不喜欢
开车，二来人懒，就拖着了。新学期一开始，几次去机场接新生，老破车让
我恼火得不行。于是下决心修一下，查查手册发现可能是spark plug的问题，
而且这玩意自己换起来比较简单，就决定自己动手了。
具体过程很简单，把spark plug boot摘出来，然后拧螺丝一样把spark plug
从engine里拧出来，再把新的装回去就可以了。装新的spark plug之前，在
螺纹上稍微抹上点机油。这样下回比较好起出来。
然后顺便查了一下air filter，乖乖不得了，那个斗里面几乎一半堆满了松
子。air filter都成黑色的了。花了十刀买了个新的换上。
下午带领导去逛mall，顺便试车，加速性能上去了。点火发动的时候噪音有
所减少，颤动也减少。但是加速踩油门的时候，还是很吵，尤其是刚上路的
时候，估计是因为muffler的问题。因为年检刚过，暂时不想费那么多钱去修
了。
下一步 |
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b******d
发帖数: 64 | 38 换tranny fluid真是脏，也累！先开了一圈把车弄热，在开上ramp,用10mm的allen
socket，加上adaptor和24寸的break bar，打开变速器和分速器的两个drain plug很顺利
，呵呵，再次多谢fulluey在工具上的帮助！
但是加起来就不容易了，主要是differential oil和tranny oil是分开的，根据DingD的
文章，用针管往里面加differential oil，累死了，受空间限制只能用10mm的针桶，估计
来来回回加了至少100多次（不知道DingD加了多少次，呵呵。。。），针管还不那么容易
伸到位，得扭着进去，所以吸一次加一次都要不少时间，其间还两次打翻新tranny
fluid的瓶子，弄的地上到处是油，衣服也报销了：（
tranny oil反而好弄，卸pan卸filter都没费什么事，就是那十几个螺丝拧的够烦。原本
打算只用2个小时就换好，结果花了4个小时，郁闷！5瓶tranny oil,打翻了两次漏了将近
一瓶，算下来总共加进去4个quarter 多一点吧。
然后买菜，吃饭，回来接着弄fuel
filter，放掉油压， |
|
s*******t
发帖数: 2896 | 39 连借ramp，到最后加了4 gallon油回到家，共1小时40分钟
因为第一次自己动手，耽误了很多时间:
1. release pressure的油泵插头，应该用改锥撬一下，直接拔不出来。琢磨了半天。
2. 发动engin，转了2秒钟就停了，以为没relieve好，又打了一次火，造成浪费电，电池
不行了。幸亏朋友开车过来帮忙，jump了一下。
3. 拔管子的时候，发卡耐心就能弄下来。
4. 固定filter的铁箍听人劝，完全拆下来了。就是拧上去的时候不知道该有多紧。拧到
有声音不敢拧为止，可能有点损坏。问题好像不大，一万mile以后再换了。其实应该边拧
边查是不是活动，不活动立刻停。就怕热胀冷缩，断了就完蛋了，回头再检查一下。
5. 还有一点，拧螺丝前，不管三七二十一WD40先。
高手肯定要说，不就个fuel filter吗，婆婆妈妈的。没办法，我是菜鸟，激动阿。 |
|
g***e
发帖数: 5292 | 40 请指点，有教程吗？
另外，我自己可以换cabin filter, 如果实在弄不了engine filter，
去小修车铺换，大概多少钱劳力费？
谢谢！ |
|
j*****A
发帖数: 1395 | 41 你这ac filter 换得也太勤了吧。我2002 的odyssey开了6万miles, 还从没换过ac
filter,感觉还好。 |
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t*a
发帖数: 18880 | 42 1. older cars do not have it.
2. 眼不见未经：? 那还是不见为好。
和动力无关，不过可以想象几年没有更换的的家用AC filter:P 而且比哪个还糟。
Honda dealer给我看2年Filter样子的时候我以为他从哪里找一个脏的吓唬我呢。自己
更换2年后发现的确好脏。当然，不知道有多脏最好 :P 省心，省钱... |
|
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m******g
发帖数: 3667 | 45 上个礼拜打算把air filter换掉，但是松掉air filter盒子的4个螺丝后，盒盖打不开
，查了网上的资料说，要把连在盒子这一段的hose送一下。送了后还是打不开，感觉
hose这里太短，没有空间让盖子向上翘。 |
|
j*****A
发帖数: 1395 | 46 我有一辆2006年的Accord,应该和2007的model一样，第一次换air filter 也挺费劲，
以前换其他车都没问题，06/07 Accord 的设计有问题，导致换Air filter 很麻烦。
我印象当中好像不只4个螺丝，可能有6个以上。还有就是一定要把挡住盖子的地方用力搬开
一点才能打开盖子（边上有人帮忙更好）。 |
|
k****i
发帖数: 552 | 47 【 以下文字转载自 Auto_Fans 俱乐部 】
发信人: kurali (kurali), 信区: Auto_Fans
标 题: 这个sb Air Filter怎么洗??
发信站: BBS 未名空间站 (Wed Apr 14 17:43:00 2010, 美东)
好象是K&N的air filter
但是好像不能把它拆下来变成一个平面的
只是整体的一块
(见图)
是不是还是照K&N的洗法一样 正反两面喷东西洗? |
|
p******r
发帖数: 6213 | 48 你的service内容中有change cabin air filter这项吗?有的话找dealer说filter is
missing. |
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n**d
发帖数: 286 | 49 dealership 说那里没有filter，2009 audi A4 的filter在车内，副驾前面的hood底下
。。。有没有其他2009 audi A4 的朋友看看是不是那样？图片里的位置打开前盖，在
挡风玻璃下面，拧一个螺丝就可以打开。 |
|
j*****A
发帖数: 1395 | 50 最好换掉。这次不换，下次还会碰到同样问题。
可以去autozone 或pepboy 买一个专么拧oil filter 的扳手，或者找个修车铺花$5把
oil filter 拧松，再开会家自己换，换好后用手拧紧就行了。 |
|
