f******n
发帖数: 59 | 1
I guess noise coming from crank arm not pedal. |
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i**********g
发帖数: 159 | 2 when does the noise happen?
At the middle of every stroke when you have the most torque?
Sounds like a BB bearing seal or bearing problem.
Normally, You just need an allen wrench to pull out the crank arm then you
can see the bearing seal. |
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w******x
发帖数: 4396 | 3 narrow down the suspects. is the clicking noise coming out once per rev?
does it happen if you were not sitting on the saddle? does it happen if you
were not on the bike but rotate the crank with the left pedal? the right?
neither? are your chainring bolts tight? are there any cracks on the
chainstay (don't laugh--it happens more than you think)?
use your common sense to isolate the cause, then fix it. |
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z*i
发帖数: 58873 | 5 ft。 most noise was leaked from the seahawk team。 |
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p******a
发帖数: 413 | 6 My SCAR has the stock brake, doesn't have that high pitch noise you
described. I guess it's the flash hider. |
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s****y
发帖数: 267 | 7 Just install a thule roofrack. Cannt get along with the wind noise. How do
you guys do with it? Is a fairing really useful? Thanks. |
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z****n
发帖数: 5870 | 8 杀人啊。都是森海的牌子。
用$9.99的noise canceling headphone飘过。。。 |
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I*G
发帖数: 480 | 10 处理俺们的小DC照片的noise这下方便了
加上flickr的upload, 强大不少,(虽然以前有plugiin) |
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d**i
发帖数: 9682 | 11 尽管行列噪声是电路中不可避免的，但原来的那个copy已经到了我认为不acceptable的
地步。新的30D到了，简单的试测一下，个人认为差别是明显的，超过了应该允许的样
本差异。新的copy的statistical noise curve和多部20D/30D的基本吻合，而明显低于
第一个copy。 |
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s****d
发帖数: 1205 | 12 still want it? leave me your email. I can send you noise ware for PS. |
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T****i
发帖数: 15191 | 13 Noise. First ISO800, second ISO1600 |
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d*b
发帖数: 21830 | 14 现在美国市场上第一批nex-5n都有click noise,这第一批主要是这3家出的货：B&H,
Sony,Adorama。 我老测试过3台nex-5n,每台都有click, 而且这个click跟加速度无关
，tilt到一定角度就会click.
网上有人说nex-5n的click是tilt snesor造成的，我老眼盘了nex-5n的service manual
,发现这个机器没有tilt sensor, 里面用的似乎是gyro.
网上也有人说nex-5n的click是快门机构的设计缺陷造成的，还有人说，Sony的维修是
对这个装置加grease，但我发现，nex-5n的快门跟老老年前的A33用的是同一个快门，
Sony H094机构，只不过nex-5n做了稍微的改进：最初parts number: 148-7-6914, 随
后改进为 148-7-6915.而A33后期使用的parts number是148-7-9022。nex-5n的快门也
不是啥高贵的产品，我从Sony Professional买全新的H094机构才卖67刀。
总之，仔细研究了nex-5n的service man... 阅读全帖 |
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a*****0
发帖数: 3319 | 15 60D录的像在电脑上看，出现很多big static noise画面。LCD上是看正常的。
请问这是为什么？多谢。 |
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x****c
发帖数: 25662 | 16 什么是big static noise？
是不是播放器的原因。 |
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q*z
发帖数: 13362 | 18 这么大的噪音,noise cancellation也不行,
塞两团棉花在耳朵里吧 |
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l*****e
发帖数: 8596 | 19 noise cancelation比棉花厉害把 |
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f*******y
发帖数: 2368 | 20 多谢。哪天也去弄一个试试。
曾经遇到过夜里特别扰邻的邻居，所以对earplug有些比较，当时不知道有你说的这款
耳机，而一般的noise cancelling耳机效果没有earplug好。曾经试过的最好隔音
效果是里面塞foam earplug，外面再堵silicone earplug，尽管不舒服，但能隔绝
几乎一切外界噪音。
我估计用你说的这款耳机，里面再塞silicone earplug，应该既能达到隔绝所有噪音，
又不会觉得不舒服。不像塞两个earplug，耳朵眼会挺难受的。 |
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g*****n
发帖数: 21539 | 21 偶的就是noise cancling的啊， 只有和bose的比较过， bose的在没有声音的时候耳朵
有个压力， 很不舒服的说 |
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l*x
发帖数: 396 | 23 add heavy sharpenning and noise reduction, a 7d is better than 5d3 by
default. |
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t******k
发帖数: 5617 | 24 以为是大招，结果是一坨大牙膏
t's convenient to think of the new 50MP as essentially an upscaled version
of the 20MP sensor inside the EOS 7D Mark II - minus the 7D II's Dual-pixel
AF. The pixel pitch of 4.14 microns is certainly very similar across both
sensors. Accordingly, Canon tells us that at a pixel level, noise levels
should be very similar to the EOS 7D Mark II and slightly better than what
we'd expect from a 5D Mark II (note: not a 5D Mark III). Oddly though,
maximum ISO sensitivity is capped at ISO ... 阅读全帖 |
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D**1
发帖数: 1106 | 25 我个人一般拍开LENR, 没啥影响，就是耗时。
A7RII hot pixel noise 是比D810 那块芯片要高 |
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l**7
发帖数: 3940 | 26 【 以下文字转载自 Tennis 讨论区 】
发信人: ler7 (Gala), 信区: Tennis
标 题: Screaming Sex Noise interrupted Sarasota Open ...
发信站: BBS 未名空间站 (Wed Apr 19 11:16:02 2017, 美东)
https://youtu.be/jVfZJFNYF0s |
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i*******e
发帖数: 436 | 27 just wonder who else has this issue, on my MBA, it is coming from the left
side where my palm rests when
typing, if i apply a little pressure, it makes a loud popping noise, which
is very annoying. when i took it to apple
store, i was told that it is normal, and nothing they cannot do. anyone else
has this problem? |
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t******u
发帖数: 3036 | 28 bose好了 noise cancelling做的还不错， 就是音质差点 |
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T********k
发帖数: 94 | 31 刚装了套系统， Gigabite z68-ud3h-b3 MOBO +AZZA hurrican 2000 case.
集成音响，back audio正常
front panel audio 有buzzing noise.
咋回事呢？ |
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T********k
发帖数: 94 | 32 我看了些论坛，是接地问题。
In front panel,usb 2.0 and audio share same ground to computer case.
usb cause buzzing noise.
Their solution is to disconnect audio ground, including mic ground and
headphone output ground, from common ground.
What you guys think? |
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c****t
发帖数: 5452 | 34 我用的seasonic 400fl 没听见过noise |
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j******g
发帖数: 1098 | 35 海韵的qc太差了，我的就有coil noise，关机但是通电情况下就会电流啸叫 |
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d***y
发帖数: 263 | 36 今天腰背太疼了，没法读下去。以下是一些大概印象, 欢迎指正。
1。理论的多，实验的少
2。原核的多，真核的少 （collins JJ 的nature paper好像有跟本错误）
3。 focus on txn 的多，post-txn 的少
4。绝对重要，很多critical gene protein level is very low, understand how noise
is generated or filtered out is very important.
5.实验室有一些ground work,能节省不少时间
conclusion: Seem like worth pursuing a career on this...??? |
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T**********t
发帖数: 1604 | 37 应该是一回事吧。好像都是用background noise这个说法啊。 |
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z*****n
发帖数: 7639 | 40 seems there are so-called white noise compressor filters. |
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h******v
发帖数: 30 | 41 Assume the power transmitted is p(W), the distance between the transmitter a
nd the receiver is r(m), then the power flux density at the location of the
receiver is
S=p/[4*3.14*r^2] (W/m^2).
Assume the effective length of the antenna of the receiver
is l(m). My question is how to caculate the voltage v(V)generated in the ant
enna? Is the following equation correct?
(v/l)^2/367=S=p/[4*3.14*r^2]
My second question is about noise limited sensitivity (abbreviated NLS bello
w).In th |
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k**f
发帖数: 372 | 42 MATLAB should be fine.
How is the data file generated?
What is the format of the data file?
How did you load it into MATLAB?
Apart from the slow loading, do you have issue analyze the noise? |
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l*****x
发帖数: 3431 | 43 以thermal noise voltage为例吧，正比于KT/gm，所以gm增加好
input pair记得是PMOS好，具体原因忘了 |
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r****e
发帖数: 122 | 44 PMOS 1/f noise 好点， for some unknown reason...
什么 |
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r****e
发帖数: 122 | 45 If I remember well, 1/f comparasion hasn't been related to Gm yet, as
people are comparing Gate *voltage* noise for the same W*L, and Pmos has
larger coefficient....and why it's large seems not clear in physics, we can
guess holes might play a role in it...
So |
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s*******y
发帖数: 4173 | 46 resistor value?
resistor will also generate thermal noise.
and |
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w****a
发帖数: 11 | 47 Any suggestion to eliminate or reduce the noise? thanks! |
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