h****n
发帖数: 413 | 1 I installed that before on my old house and it definitely help reduce some
road noise.
But if your bedroom is too close to the road, the noise can still enter
through walls or roof. Once you get adjust to the new environment after
installing the new windows, you will hear some new noises.
The one I used is called soundproof window or something, about $1500 for two
bedrooms at that time. They just put it in addition to the existing windows
. Mine were inside the existing windows. |
|
O****e
发帖数: 3290 | 2 1. The clicking noise come out once per rev.
2. It happen even I am not sitting on the saddle.
3. When bike is on stationary trainer with a high resistance, I rotated the
left pedal and can feel slack and slight vibration and hear vague noise that
sounds very much like an inadequately lubricated ball bearing.
4. Forgot to rotate the right one on stationary trainer.
5. Chain ring bolts feel pretty tight.
6. No visible cracks on the chainstay.
7. No noise when rotate crank on a bike repair stand. |
|
s****e
发帖数: 36 | 3 需要用matlab产生一组colored noise。
办法是先产生white noise，然后用filter产生需要的noise。
哪位大拿知道怎么设计filter，funtion如下 |
|
d*******d
发帖数: 3382 | 4 If high order statistics are taken into consideration,
white noise definition needs to be reconsidered.
We can define white noise if it's not correlated
to other time. In this way, it does not have to be stationary,
and spectrum does not exist.
Also, white noise is relevant to bandwidth. There is no
physical infinite bandwidth signal. Therefore, "whiteness"
is always with respect to the sampling rate of the signal.
If a signal is filtered at B bandwidth continuously,
then sampled at double of th |
|
a******w
发帖数: 774 | 5 Noise，对于一个input pair来说，是PMOS or NMOS 的noise更好，请解释主要是什么
东西引起的。如果降低noise，gm需要减少还是增加？
看到这个面试题，希望能有人指教一下 |
|
c******k
发帖数: 1140 | 6 请见图的圈内部分，这个marker显示了RF的频率，功率，是不是括号内显示的是noise
floor? 但发现这个值跟着 RF的功率值而变化。
比如图示 －21.13dBm (-71.13dBm/Hz)，
提高RF功率：－10.13dBm (-63.13dBm/Hz)。
noise floor 应该是底下的那条noise 基线。是基本不变的，那么括号的显示（-71.
13dBm/Hz）这是个什么值？ 谢了 |
|
ET
发帖数: 10701 | 7 gate voltage noise density:
vn^2=kf/(w*l*cox*f)
drain current noise density (due to gate noise) =
in^2=vn^2*gm^2
gm^2=2*Id*un*cox*(W/L)
so in^2=kf*Id/(L^2*f)
为何我看到的公式是：
i^2/(delta f) = kf*Id/(L^2*cox*f)
谁能给解释解释？ |
|
ET
发帖数: 10701 | 8 你不是都说了吗?
output noise density/(intrinsic gain)
以你的setup的话，这个65nm的technology, gmR <10
所以input refered noise比output noise density曲线相似，小40db. |
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w*u
发帖数: 2 | 9 In physics system, it is believed that 1/f noise is generated by a continuou
s low activation energy distribution.
Covered the low frequency (low energy) window.
Each activation energy(a 2 level system) relates to a lorenze spectrum(a "step"
function in noise-frequency graph).(something similar to the knee in capacitance
band pass curve )
With continuous steps(flat distribution of activation energy), the slope is
1/f.
As I suggested, there are really a lot about this 1/f noise can be found in
th |
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f*******i
发帖数: 8492 | 10 现在我有两列数字A（i,t）和B(t)
其中i对应公司，t对应年份
A对于每个公司，每年都有一个值，而B则是每年一个值
我想实现如下操作：
A（i,t)=C(i)+D(i)*B(t)+noise
求出C（i），D（i）和noise，并且输出为一个新的data sheet
其中，C（i）和D（i）对于每个i值是定值，而noise则是任意的
我现在如果直接做regression的话，by company by year
则得到的D（i)全都是0 |
|
f*******i
发帖数: 8492 | 11 by company的方法我尝试了
做完之后，每个company 只有一个c(i),D(i)是没错
可是问题是，我不知道noise是每个company每年一个，还是每个company只有一个
我需要的noise是每个company每年都有一个noise |
|
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w*******y
发帖数: 60932 | 14 3-Pack: Ace Noise Isolating Comfort Wear Earbud Headphones!
LINK:
http://www.bensoutlet.com/products/ace-headphones
The Rolling Stones, Your Father Burping, Rhianna, Loud Construction Next-
Door, Katy Perry, Your Grandma Farting, Keith Urban, Your Sister Whining...
There are some things you just don't want to listen to, and there are some
things that you'd love to listen to. With these noise reducing ear buds, you
can finally block out the crap you don't want to hear- like your father
burping af... 阅读全帖 |
|
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w*******y
发帖数: 60932 | 16 Link:
http://www.walmart.com/ip/Jawbone-II-Aliph-Bluetooth-Headset-with-Noise-Assassin/14967651
Jawbone II Aliph Bluetooth Headset with Noise Assassin:
Ultra smooth, medical-grade plastic
Patented Voice Activity Sensor
Talk Time: 4 hours
Standby Time: 8 days
Range: up to 33'
Noise cancellation
This Jawbone Bluetooth Headset supports Bluetooth 1.0, 1.1, 2.0
Package Contains:
1 Jawbone Headset
1 Optional Earloop
1 USB Cable
1 A/C Wall Charger/Adapter
1 Quick Start Guide
1 Wallet Sized Instruction ... 阅读全帖 |
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w*******y
发帖数: 60932 | 17 Link:
http://www.amazon.com/Zelher-P15-Wireless-Bluetooth-Cancelling/
Enter code 5DSPROMO
Technical Details
Standby Time 300 Hour, Working Range: 30ft, 12 Months Warranty
Multipoint support: 2 Connection Simultaneously, Balanced and light weight
Frequency:2.4GHZ, Bluetooth Chipset: CSR BC6V2. 1
Blocks 4 Times external noise, Noise canceling, crystal clear sound
Call waiting, 3-way calling and voice activated dialing,Call answer / and
redial, mute,
refuse incoming calls
Product Description
Zelher... 阅读全帖 |
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k*********l
发帖数: 1218 | 18 上个星期的文章，什么是大数据，就是大量的，没有经过人工处理，随机的数据，
trump是否能赢你要看下面的几个数据：
1）各大social network网络的follower数据
2）一些重要新闻的comments，和like，dislike的数据
3) search 的关键词的出现频率，这个我们拿不到，只有google有
4）各地rally参加的人数，老妖婆参加的人数多少，trump有多少
poll在信息发达的今天，已经没有多大用处了，只有大数据才能给给正确的方向。
还有就是不要被媒体brain wash，多用logic thinking，这次对gay的袭击
1）FL是最重要的swing state，想想看普通人会怎么投票
2）LGBT全面导向谁？
3）妇女导向谁
4）黑人会导向谁
Poll和各大媒体都是noise，有时候可以当作反指，越是抹黑谁，说明谁越有可能赢（
但是不是所有时候，因为媒体最重要的就是引起争议，所以更多的时候是充当了挑起战
火的脚色，所以就是noise）
----------------
发信人: katharinezl (linlin), 信区: USANews... 阅读全帖 |
|
发帖数: 1 | 19 所谓大数据是说样本量大，随机性高，能够接近反映种群的基本属性。你举的数据都是
biased，只代表种群小部分，就是数据再大也无法反映种群的总体。种群里还有大量的
人对政治不狂热，没时间上网，没兴趣争辩。
[在 katharinezl (linlin) 的大作中提到：]
:上个星期的文章，什么是大数据，就是大量的，没有经过人工处理，随机的数据，
:trump是否能赢你要看下面的几个数据：
:1）各大social network网络的follower数据
:poll在信息发达的今天，已经没有多大用处了，只有大数据才能给给正确的方向。
:还有就是不要被媒体brain wash，多用logic thinking，这次对gay的袭击
:1）FL是最重要的swing state，想想看普通人会怎么投票
:Poll和各大媒体都是noise，有时候可以当作反指，越是抹黑谁，说明谁越有可能赢（
:但是不是所有时候，因为媒体最重要的就是引起争议，所以更多的时候是充当了挑起
战火的脚色，所以就是noise）
:我相信，google，华尔街，大佬们（背后的PAC)，包括白宫，fbi，cia通过对数据的
解读... 阅读全帖 |
|
k*********l
发帖数: 1218 | 20 11/9 recap:
hehe, I need to get a summary of all my predication of this election.
1) since the primary is done, I have predict WI and MI is very sure win
state. PA will be very close to watch, NH is very close to watch. (did not
publish this vsion, but based on the votes data, it is very obvious)
2) I think FL must have some fraud going on. The race should not be that
close. FL should be a very clear win.
This is all based on the big data. Big data can be very very valuable.
Because of that and ... 阅读全帖 |
|
发帖数: 1 | 21 所谓大数据是说样本量大，随机性高，能够接近反映种群的基本属性。你举的数据都是
biased，只代表种群小部分，就是数据再大也无法反映种群的总体。种群里还有大量的
人对政治不狂热，没时间上网，没兴趣争辩。
[在 katharinezl (linlin) 的大作中提到：]
:上个星期的文章，什么是大数据，就是大量的，没有经过人工处理，随机的数据，
:trump是否能赢你要看下面的几个数据：
:1）各大social network网络的follower数据
:poll在信息发达的今天，已经没有多大用处了，只有大数据才能给给正确的方向。
:还有就是不要被媒体brain wash，多用logic thinking，这次对gay的袭击
:1）FL是最重要的swing state，想想看普通人会怎么投票
:Poll和各大媒体都是noise，有时候可以当作反指，越是抹黑谁，说明谁越有可能赢（
:但是不是所有时候，因为媒体最重要的就是引起争议，所以更多的时候是充当了挑起
战火的脚色，所以就是noise）
:我相信，google，华尔街，大佬们（背后的PAC)，包括白宫，fbi，cia通过对数据的
解读... 阅读全帖 |
|
o*******g
发帖数: 553 | 22 02 Lincoln continental high milage ~159K. Recently it has noise and friction
(seems from the front left tire???,
suspensions?) when I start the car in the morning (winter is coming, so the
car is cold). When I drive several
miles and the car is warm, these noises disappear (at least I do not feel it
is in an abnormal driving condition).
I am not sure it is because the car is old and cold or the car does have a
problem.
If you have similar experience, would you please tell me the possible causes
... 阅读全帖 |
|
n****y
发帖数: 270 | 23 I am sorry that I can not input Chinese here.
I have honda crv 2004. Recently I found that there is road noise when I
drive slowly and on smoothy road. Mechanic asked me to change my tire and I
did. But the road noise is still there. Anybody knows what caused this
problem?
They also asked me to change all of my rotors. Is this reasonable? |
|
s****i
发帖数: 519 | 24 昨天去试了两个08年的Sienna，wind noise貌似差不多，但是有一个车的road noise明
显大一些而且觉得有一点点颠。这个差别可能只是轮胎牌子，压力和新旧造成么？
另外，那些轮胎牌子属于性能价格比较适中的啊？ |
|
y******7
发帖数: 1554 | 25 Since it is a new car, you may just ask a Subarau dealer for possible reason
. If you can always hear the noise, ask one from Subarau dealer to drive
with you and show the noise to them. |
|
c***z
发帖数: 6348 | 26 I bought the car in Feb 28.
It had the noise two weeks ago, lasted for about 1 min. we thought it is the
air through the window. But the noise happened again, with windows closed.
We thought it is the exhaust, or worse, the enigne. Does anyone have similar
situation?
Thanks a lot! |
|
d****z
发帖数: 75 | 27 If you want to buy 2013 Nissan Altima,pay attention to the noise level when
the radio is off. Some or most of the new Altima give some sort of whining
noise, possibly from power steering system. It is annoy if you have very
sensitive ears. Nissan has acknowledged the problem but so far has no
solution to it.
Other than this problem, my driving experience of the new Altima is fine. |
|
W***n
发帖数: 11530 | 28 RAV4 LE 3.5L
Automatic transmission 828 miles
Bought a RAV4 2017 LE about two weeks ago with 26 miles on the engine. The
first week no issues very smooth and quiet.
The second week is when the problems started. The first issue was a weird
rattling noise which was loud at points and later on got quiet. Notice noise
was louder after driving it for about 2 hours in traffic. Now the engine
sounds like a lawnmower every traffic light.
I have reached to the dealer, and they have asked me to bring the ... 阅读全帖 |
|
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l***e
发帖数: 150 | 30 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Bose QC20 Acoustic Noise Cancelling @ 210
单张面值:
$210
可接受价格(必须明码标价！):
物品新旧要求:
new
邮寄方式要求:
my lable
买卖双方谁承担邮寄损失(Required if not code only):
before me, after you
付款方式说明:
non cc paypal
其他补充说明:
Bose QuietComfort® 20 Acoustic Noise Cancelling® headphones —
Apple devices
Black color
广告的有效期:
until sold
物品来源(Required for All Cards!):
我的联系方式:
PM
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
l***e
发帖数: 150 | 31 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Bose QC25 Acoustic Noise Cancelling @ 200
单张面值:
可接受价格(必须明码标价！):
物品新旧要求:
Bose QuietComfort® 25 Acoustic Noise Cancelling® headphones —
Apple devices
Triple Black
邮寄方式要求:
my lable
买卖双方谁承担邮寄损失(Required if not code only):
before me, after you
付款方式说明:
non cc paypal
其他补充说明:
广告的有效期:
until sold
物品来源(Required for All Cards!):
我的联系方式:
PM
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
t*********u
发帖数: 26311 | 32 【 以下文字转载自 FleaMarket 讨论区 】
发信人: tingtingliu (Grand Cherokee Overland), 信区: FleaMarket
标 题: Re: [求购]Able Planet Noise Cancelling NC1000CHA
发信站: BBS 未名空间站 (Sun Dec 5 16:44:49 2010, 美东)
up
up
up
我想要的物品:
Able Planet Noise Cancelling NC1000CHA
单张面值:
n/a
可接受的价格(必须明码标价！):
45 + ML
物品新旧要求:
new
邮寄方式要求:
ML
买卖双方谁承担邮寄损失(Required if not code only):
board rule
付款方式说明:
non cc pp
其他补充说明:
from newegg
广告的有效期:
till got
物品来源:
from newegg
我的联系方式:
bbs mail
二手交易风险自负！请自行验证是否合法和一手卡！:
y |
|
C****u
发帖数: 1464 | 33 我想要的物品:
NEW Ultimate Ears 700 Noise Isolating Earphones $75 each + my label
EMAIL ONLY.
1) 请email: g************[email protected]
2) email的格式如下：
Subject:【求购】Ultimate Ears 700 Noise Isolating Earphones - Your id
BBSID: xxxxx，
数量，总金额
Zipcode: xxxxx
收款方式： paypal
电话号码： (xxx)xxx-xxxx
单张面值:
可接受的价格(必须明码标价！):
above
物品新旧要求:
brand new sealed
邮寄方式要求:
my label to me if more than 4; otherwise, wait for my label(s).
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
pp etc
其他补充说明:
无故反悔加黑名单，多谢理 |
|
C****u
发帖数: 1464 | 34 我想要的物品:
NEW Ultimate Ears 700 Noise Isolating Earphones $85 each + my Fedex label to me, or PM your price if more than 5.
EMAIL ONLY.
1) 请email: g************[email protected]
2) email的格式如下：
Subject:【求购】Ultimate Ears 700 Noise Isolating Earphones - Your id
BBSID: xxxxx，
数量，总金额
Zipcode: xxxxx
收款方式： paypal
电话号码： (xxx)xxx-xxxx
单张面值:
可接受的价格(必须明码标价！):
above
物品新旧要求:
brand new sealed
邮寄方式要求:
my label to me if more than 4; otherwise, wait for my label(s).
买卖双方谁承担邮寄损失(Required if not c |
|
|
l***e
发帖数: 150 | 36 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Bose QC20 Acoustic Noise Cancelling @ 210
单张面值:
$210
可接受价格(必须明码标价！):
物品新旧要求:
new
邮寄方式要求:
my lable
买卖双方谁承担邮寄损失(Required if not code only):
before me, after you
付款方式说明:
non cc paypal
其他补充说明:
Bose QuietComfort® 20 Acoustic Noise Cancelling® headphones —
Apple devices
Black color
广告的有效期:
until sold
物品来源(Required for All Cards!):
我的联系方式:
PM
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
l***e
发帖数: 150 | 37 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
Bose QC25 Acoustic Noise Cancelling @ 200
单张面值:
可接受价格(必须明码标价！):
物品新旧要求:
Bose QuietComfort® 25 Acoustic Noise Cancelling® headphones —
Apple devices
Triple Black
邮寄方式要求:
my lable
买卖双方谁承担邮寄损失(Required if not code only):
before me, after you
付款方式说明:
non cc paypal
其他补充说明:
广告的有效期:
until sold
物品来源(Required for All Cards!):
我的联系方式:
PM
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip: |
|
|
|
d******0
发帖数: 22800 | 40 买Sennheiser PXC 450 别犹豫。
bose在结实耐用和sound quality上就被直接删去了。noise cancel上也不比pxc 450强
，就剩下一个牌子了。
ATH-ANC7 因为是在耳朵上的，所以佩戴舒服上略差，noise cancel上有450的85%吧。
sound quality不错，和PXC 450不同风格的hifi，不相上下，都比bose浓郁浑浊的低音
强太多。 |
|
d*o
发帖数: 108 | 41 Thanks.
But after reading water hmmer, my problem doesn't seem to be a water hammer
one. It's not like a Bang, and some other noise and then stop. My noises are
kind of continuously vibrating.... still looking.
Any other thoughs? Thanks. |
|
|
m*****s
发帖数: 1471 | 43 宝宝最近很闹觉。9个月了，上white noise还可以吗？
另外，可以推荐个white noise吗？哪儿下载呢？谢谢！ |
|
U********l
发帖数: 636 | 44 我们一直用，我发现我要是自己晚上听的话都睡的好些，可惜我们家没有多余音响了。
用收音机没频道的台比较好，下载的一般放一个小时重播之间会中断，然后又突然开始
，还吵了宝宝。 Amazon有下载，pink noise, white noise之类的。 |
|
|
g****g
发帖数: 1828 | 46 【 以下文字转载自 deals 俱乐部 】
发信人: gengwg (megaOr), 信区: deals
标 题: Newegg has MEElectronics M9P-BK Noise-Isolating 3.5mm High
发信站: BBS 未名空间站 (Thu Feb 24 00:18:34 2011, 美东)
Newegg has MEElectronics M9P-BK Noise-Isolating 3.5mm High Performance
Headset with Control talk in (black) for $9.99 with Free shipping. |
|
|
C**d
发帖数: 678 | 48 【 以下文字转载自 HiFi 讨论区 】
发信人: Card (Four Dimension), 信区: HiFi
标 题: 求推荐蓝牙耳机 with active noise cancellation
发信站: BBS 未名空间站 (Fri Feb 1 23:47:46 2013, 美东)
noise cancellation 一定要好 |
|
h*****l
发帖数: 197 | 49 每天都坐，最忍受不了bart是high-frequency噪音。Noise-cancellation只对low-
frequency噪音。noise cancellation headphone 对BART有用吗？
谢谢 |
|
m**********2
发帖数: 2252 | 50 看到版主说voice，voice，我想我就来点noise吧。记得在Toyota center看NBA的时候
，那个大屏幕有时会弹出noise这个单词，我猜就是请大家大喊大叫吧。我就借来用用
，说说今天发生的几件事。
首先就要到Halloween了。公司在那天有个午餐比赛，通知已经贴到break room的冰箱
上了。说是这次比赛呢，分了好几个项目，有主餐的评比，也有dessert的评比。总之
大家把自己的看家本领拿出来，名次会在10月31号聚餐的结束时宣布。我经过认真考虑
，决定带个炒饭去。Dessert 我就不指望能和老美比了。曾经有段时间迷上了做蛋糕，
把Walmart的每个口味的Cake Mix都买来做了一遍，然后拿着蛋糕到处送人（可惜在
Houston认识的人不多，送也送不出去）。后来有个同事在Break room放了一个他自己
做的蛋糕叫大家尝，我试了以后就打消了把蛋糕带到公司的念头 – 水平不在一个层次
。不过我觉得我的炒饭应该还可以吧。看来下个星期天要好好采购一下，一定不能坏了
中餐的名声。如果我的炒饭获奖了，我会告诉大家一声的。
今天一个同事告诉我，他会写“朋友”这两个 |
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