由买买提看人间百态

topics

全部话题 - 话题: transduce
首页 上页 1 2 3 4 下页 末页 (共4页)
t*o
发帖数: 2606
1
【 以下文字转载自 Living 讨论区 】
发信人: gezhi89 (zhonda), 信区: Living
标 题: Re: 邻居周末party特吵,有啥隔音的东西推荐吗
发信站: BBS 未名空间站 (Mon Feb 22 09:38:36 2010, 美东)
A few speaker180 degree out of phase.
If you want mount on the fence, you can use tactile transducer, same 180
degree out of phase. It might require some testing to perfect this. That is
what I use to cancel the sound from my home theater room. I have over 3000
watts (one 400 watt amp for each channel) for the theater, I used about 20
tactile transducers mounte
w*******y
发帖数: 60932
2
Link:
http://www.tigerdirect.com/applications/searchtools/item-Detail
Previous FP: http:// />
Vizio VSB200 HD Sound Bar
Designed for home theater enthusiasts, this Vizio VSB200 HD Sound Bar
includes cutting edge sound technologies such as SRS TruSurroundHD for an
enveloping sound experience and features such as four 3 high efficiency hand
built mid/bass transducers and two 3/4" high performance aluminum dome
neodymium tweeters. The Vizio VSB200 HD Sound Bar is the perfect addition to
your home t... 阅读全帖
c**i
发帖数: 6973
3
来自主题: Military版 - 美军在为21世纪筹划哪些新武器
VOA Chinese, Mar. 26, 2010.
http://www1.voanews.com/chinese/news/US/NEW-weapons-20100326-89275157.html
Note:
(a) 传感器 is a term used in China. English can be sensor, transducer or
transmitter.
(b) 隐形的、从战机上发射的巡航导弹 stealth missile
(c) 高超音速巡航导弹 hypersonic missile
(d) For 被动式追踪器, see Missile Components. The Ordnance Shop, undated.
http://www.ordnance.org/missile_components.htm
(active, semi-active and passive)
A*Q
发帖数: 1579
4
In Level 3, ETCS goes beyond the pure train protection functionality with
the implementation of full radio-based train spacing. Fixed track-release
signalling devices (GFM) are no longer required. As in ETCS Level 2, trains
find their position themselves by means of positioning beacons and via
sensors (axle transducers, accelerometer and radar) and must also be capable
of determining train integrity on-board to the very highest degree of
reliability. By transmitting the positioning signal to the... 阅读全帖
A*Q
发帖数: 1579
5
In Level 3, ETCS goes beyond the pure train protection functionality with
the implementation of full radio-based train spacing. Fixed track-release
signalling devices (GFM) are no longer required. As in ETCS Level 2, trains
find their position themselves by means of positioning beacons and via
sensors (axle transducers, accelerometer and radar) and must also be capable
of determining train integrity on-board to the very highest degree of
reliability. By transmitting the positioning signal to the... 阅读全帖
o*****D
发帖数: 1563
6
改变了,就不是piezoelectric transducer的特征频率,振动的波幅会大幅减少,传输
距离会非常短
e******g
发帖数: 5344
7
来自主题: Automobile版 - 啥时通过smartphone实现真正keyless
因为车钥匙里面有Transducer,放手机里面会增加手机体积和耗电,没几个厂商愿意干。
用定位系统的话反应太慢,精度不高,有可能你在家里睡觉车还以为你人在旁边呢。
还有续航问题,一个纽扣电池可以用几年,手机说没电就没电了。你那个门把手伸出个
线的方法首先影响美观,第二还要考虑兼容不同手机接口的问题。。再说要是iphone 6
用了个没见过的新接口咋办?你去dealer再装个?
v*****e
发帖数: 47
8
来自主题: Classified版 - 求职求内推(嵌入式软件工程师)
本人男,2013年博士毕业于国内某985高校计算机专业,有J签证和工作许可,未来希望
留在美国发展。我的专业背景和基本情况如下:
Career Summary
Around four year’s experiences of Embedded Software development.
Dynamic and skilled embedded software engineer with diverse
knowledge of designing and implementing embedded Linux or VxWorks system
platforms in various networking environment.
Technical Skills
Proficient in Assembly language, C, C++ and Java
Knowledge in Software development life cycle processes
Experience in Li... 阅读全帖
i*******n
发帖数: 3
9
来自主题: Faculty版 - Transducers 2011 Beijing?
no one in this area?

发帖数: 1
10
来自主题: FleaMarket版 - 继续游街SUPERFOX吴山SHAN WU骗子
San Francisco Bay Area - ‎R & D on Electronics, Haptics and Sensors -
‎Apple
Shan Wu
Phone: +1 408-440-7064 Verizon Wireless - CA
- Proficient in Analog/Mixed-Signal electronics design, Sensors design &
characterization, Human-machine interaction, Prototype bring-up, Data
acquisition & processing, Embedded system, Audio acoustic, 3D Mechanical
design
- Excellent Electrical Engineering and Mechanical Engineering background
with strong skills in Mechatronics and Sensor Design & Integra... 阅读全帖
b*z
发帖数: 48
11
来自主题: HiFi版 - headphone
personal preference
sennheiser the best and most expensive.
sony good.
others don't get them.
recently obtained an HD270 from www.sennheiserusa.com
tech info
transducer: dynamic
ear coupling: circumaural, closed
freq. res.: 12 - 22,000 hz
characteristc @1k hz: 106 db
thd: <.2%
nominal impedance: 64 ohms
connector: 1/8 stereo mini-jack w/ 1/4 adaptor
connection cable: 10ft. single-sided, ofc
weight(w/o cable): 7.7 0z
realy good stuff bringing me terrific enjoyment.
for comments look up www.headwi
D**********s
发帖数: 3139
d******0
发帖数: 22800
13
来自主题: HiFi版 - Phiaton PS200 Earphones - $94.49
on amazon.
http://www.amazon.com/Phiaton-PS-200-Transducers-andTweeter/dp/
I have and love it, and paid for $129 for it.
$95 is way too good to pass! esp in amazon, you could return if you don't
want, risk free. so... I ordered another 2 pairs.
d******0
发帖数: 22800
14
来自主题: HiFi版 - Phiaton PS200 Earphones - $94.49
on amazon.
http://www.amazon.com/Phiaton-PS-200-Transducers-andTweeter/dp/
I have and love it, and paid for $129 for it.
$95 is way too good to pass! esp in amazon, you could return if you don't
want, risk free. so... I ordered another 2 pairs.
s**********t
发帖数: 455
15
好坑。我继续跳。
好的脉冲响应,等同于宽的频域响应。
上面的文章分析得很彻底了,人耳的生理构造能分辨的时域分辨率在5微秒左右,换算
成频域,至少需要40k的频率响应和120分贝的动态范围才能重现5微秒的时域分辨率 (
80k采样频率,20bit)。所以96k/24b 和192k/24b对声场的还原一定比44k/16b 的好。
我们的耳朵和大脑是最牛的hifi。
TO FULLY MEET the requirements of human auditory perception I believe that a
sound system must cover the frequency range of about 15Hz to at least 40kHz
(some say 80kHz or more) with over 120dB dynamic range to properly handle
transient peaks and with a transient time accuracy of a few microseconds at
high frequencie... 阅读全帖
D**********s
发帖数: 3139
16
这个喇叭为了美观易搬运,几乎没有做防尘和防谐振,transducer有老化的问题,一段
时间不听就能感觉出来,另外声音也比较单薄,峰值声压也不够。建议常打理,不买二
手和返修。
W***n
发帖数: 11530
17
Controls Engineer - Allen Bradley /Wind Tunnel /Aerospace
I have a need for a Controls Engineer for a company in the Aerospace engine
testing industry . This is a DIRECT HIRE position. Some international travel
will be required.
Responsibilities for the Controls Engineer
designing, implementing, commissioning, and supporting controls,
software, and data acquisition systems
Deliver concept designs, system drawings, parts lists, functional
specifications, software, and reports for the cont... 阅读全帖
v*****e
发帖数: 47
18
本人男,2013年博士毕业于国内某985高校计算机专业,有J签证和工作许可,未来希望
留在美国发展。我的专业背景和基本情况如下:
Career Summary
Around four year’s experiences of Embedded Software development.
Dynamic and skilled embedded software engineer with diverse
knowledge of designing and implementing embedded Linux or VxWorks system
platforms in various networking environment.
Technical Skills
Proficient in Assembly language, C, C++ and Java
Knowledge in Software development life cycle processes
Experience in Li... 阅读全帖
g****p
发帖数: 401
19
Project title: Development of a Photoacoustic Tomography System for Infant
Brain Imaging
Tentative start dates: July 2017
Fund: This position is funded for two years
Project description:
A postdoctoral research position is available in Optical & Photoacoustic
Imaging Research and Analysis (OPIRA) Laboratory. This position is available
to a well-qualified, highly motivated and dynamic young scientist who
wishes to enhance his/her scientific career in a friendly and stimulating
environment. The su... 阅读全帖
C********7
发帖数: 1035
20
来自主题: Immigration版 - (gone)审稿(生物传感器)
关键词:Organic Field Effect Transistor, High-k Dielectric,
transducer, chemical stimulation, Neuronal Cell, in vitro
Impact factor ~ 6
Send me your name, email, affiliation, list of publications,a couple
sentences describing your expertise. Candidate with matching background and
earliest correspondence will be recommended.
a****k
发帖数: 117
x***h
发帖数: 9020
22
anybody interested?
a***e
发帖数: 757
23
来自主题: Immigration版 - [gone] 审稿机会-polymer, gas sensing
“Catalyst-free vapour-phase method for direct integration of gas sensing
nanostructures on polymeric transducing platforms”
今天收到一个影响因子1.5左右的期刊审稿。请把你姓名、official email和个人介绍
站内给我,我负责推荐。感谢关注!
s****g
发帖数: 1028
24
来自主题: WashingtonDC版 - 股票又跌得像屎
Don't want to on this board, but if you can come to one of parties in the
future, I would be happy to demo the home theather (it is a work in progress
) to you.
I need to decide if want to get a new digital projector or retube the older
ones I got.
I am also working on the acoustic of the room right now, turning it into "
golden ratio". That ratio is one which is the room width of 1.6 times the
height and the length being 2.6 times the room height.
Since I can not change the height of the room ... 阅读全帖
T*R
发帖数: 25894
25
来自主题: WashingtonDC版 - 股票又跌得像屎
what do you need tactile transducer for?
m******h
发帖数: 5753
26
来自主题: Fishing版 - 橡皮艇上钓crappie,战果不错
这个很爽啊!
fishfinder 当然可以用了, 不过安装麻烦点,如果你的橡皮艇如果有这个option个装上就简单了。 如果没有, 那么transducer 的安装需要支架。
a***g
发帖数: 2931
27
岸钓时,可不可以用一根长棍子把transducer探到几米远的水处找鱼?
w**s
发帖数: 367
28
来自主题: Fishing版 - 请教方法:怎样去掉epoxy?
Stripper 好像氧化性比较强,有点担心会腐蚀transducer 表面。
m******h
发帖数: 5753
29
来自主题: Fishing版 - 请教方法:怎样去掉epoxy?
transducer应该是金属的吧?
应该问题不大,可以先试验一下, 确保没问题再用
A*********r
发帖数: 2115
30
来自主题: Fishing版 - Fish Finder 求推荐
Humminbird 160 PT很多人推荐,送个电池,还有那个transducer是suction cup的。
KV
发帖数: 5728
31
来自主题: Fishing版 - 请教探鱼器fish finder
据说跟扫描频率有关,一定频率之上的,比如200hz,transducer就会有轻微ticking声
音,哪位给解释一下吧。
b**********g
发帖数: 451
32
来自主题: Fishing版 - 请教探鱼器fish finder
人耳范围是20hz到20khz, transducer一般是50-200khz, 想听到还是挺难的。
肯定是连接问题或者质量问题。说本身就该humming实在不靠谱啊
KV
发帖数: 5728
33
来自主题: Fishing版 - 请教探鱼器fish finder
如果在网上搜transducer ticking noise,会有很多类似问题,humminbird和lawrance
等都有,一些人说是firing的声音,频率超过200khz时候会听到firing的声音。
连接或者质量问题不清楚,因为这个是一体的。有明白的给解释一下吧。
c*******g
发帖数: 1996
i****r
发帖数: 1797
35

这个是标准配置吧,特别是fish finder transducer mounted on TM,肯定用一块电池
啊。共享一个恒压源,电流互相基本不影响。如果是MK的比较高级的TM的话,也就是建
议加装一个保护装置来保护TM。
计划更新的那个fish finder有个数据是power output
N*********r
发帖数: 1190
36
渔民们用trolling motor的时候总是方向和快慢不停变化,好一点的model,变方向是个
电机控制的,好一点的model的变速不是用电阻的,是使用Pulse Width Modulation,
把电源高频通通断断的,来调整输出功率。这些应该都影响fishfinder成像。
不过要是成像的fishfinder,transducer好像本来就不推荐mount在船头。
Fishfinder的实际功率是很小的,这好像跟那个雷达道理一样,99.9%以上的时间不工作
,就脉冲那一下使劲。

fishfinder
N*********r
发帖数: 1190
37
transducer最好mount在船肚皮内啊,或者船尾,不要靠近motor
i****r
发帖数: 1797
38
google image: transducer on trolling motor 这个配置是非常普遍的用法,我相信
水流/供电都不会有问题。即使有,也应该是不起眼的,对找鱼不会有影响。
普通的fish finder大多数时候其实就是个depth finder,所以,有些轻微的影响或者
噪声完全可以忽略。当然,如果是nightrunner说得那种带Side Image的成像的真正的
fish finder,就是另外一回事了。
m******h
发帖数: 5753
39
来自主题: Fishing版 - 充气船及fish finder
既然存在就有合理之处, 你的说法有些片面, 你有porta-boata 就说porta-boata最好,其他的就是不好,就是浪费, 这未免一叶障目。 什么船都有利弊, 适合自己的就是好的。
FISH FINDER, 不知道你用不用fishfinder, 用什么fishfinder,$ 100 和 $1000 原
理都一样,差别主要在于功率和分辨率, 低端的对信号处理能力差点, 但一条鱼和2
条鱼还是可以分得开的,但是能分辨品种就得靠使用者自己的经验,根据回声波的形状
和强度判断,
“一条minow和10000条bass在屏幕上看起来是一样地”这样的fishfisnder 真没有见过,
即使是下图这个也可以知道有几条鱼,
淡水 fishfinder 主要是找structure, 海钓找鱼群和海底结构 ,
fishfinder找鱼可以做个试验, 把jig 顺着fishfinder 的transducer 沉下去, 看看能看到什么,

b**s
发帖数: 4571
40
来自主题: Fishing版 - [合集] 充气船及fish finder
☆─────────────────────────────────────☆
wilhelm (荷马) 于 (Wed Mar 21 19:42:04 2012, 美东) 提到:
小弟最近对船好像没什么抵抗力了,与其每次去租船,还不如自己整一条。
还请各位掌船高手给提提建议。
情况如下:
没有TRUCK没有YARD。一个普通的SHEV,后座可以放倒。
钓鱼也就在附近公园的湖里,应该属于风平浪静那种。目标鱼主要是CRAPPIE。
打算弄一条充气船,两/三个人的就可以。关键是要能收起来放进车后备箱。:),也许
根本就没有这种船,那样的话,我也就死心了。
大家有什么经验,是不是一定得配个trolling motor (motor 好办,就是电池麻烦)?
有没有什么特别的牌子,型号可以推荐的?小弟也研究了一下,那种硬底的,虽然好,
可惜好像无法放进车里。
另外准备添个fish finder。 前两天订的humminbird 170被cancel了。索性来这里问问
,因为主要目标鱼是crappie,在湖里钓,有没有什么值得推荐的牌子/型号。
预算现在还不是很清楚,但考虑到是短期投资,也... 阅读全帖
W****i
发帖数: 1314
41
来自主题: Fishing版 - 求岸钓的可靠fishfinder
哈哈
我看可以用小时候做的那种遥控航模船
上面搭载一个transducer
就成了岸钓侦察艇了!
c***3
发帖数: 85
42
来自主题: Fishing版 - 【秋风送爽】跟着饵鱼走
湖水turn over了么,atlanta这边没多冷水翻得厉害,黄的跟泥塘似的,虽然也能上鱼
。。。
楼主分相像transducer mounting呗
b********y
发帖数: 883
43
来自主题: Fishing版 - fishfinder奇怪的问题
用的是Garmin 500c, Transducer装在trolling motor的底部
1.第一张图是trolling motor在80%左右的速度,貌似下面有很多鱼
2.第二张图是trolling motor在20%左右的速度或者停止状态,貌似下面没有鱼
在同一片水域,只要速度降下来,就立即变成第二张图的样子了。这是为什么呢?水里
到底有没有鱼呢?
b********y
发帖数: 883
44
来自主题: Fishing版 - fishfinder奇怪的问题
用的是Garmin 500c, Transducer装在trolling motor的底部
1.第一张图是trolling motor在80%左右的速度,貌似下面有很多鱼
2.第二张图是trolling motor在20%左右的速度或者停止状态,貌似下面没有鱼
在同一片水域,只要速度降下来,就立即变成第二张图的样子了。这是为什么呢?水里
到底有没有鱼呢?
m*******n
发帖数: 5103
45
来自主题: Fishing版 - fishfinder奇怪的问题
以前我有一个简单的手持寻鱼器,同样的问题。它的 transducer 不是贴在船身上,而
是挂在一个悬浮的浮标下,所以与船身或马达的干扰没有关联。但是船一动起来(手划
的船),就会显示下面有鱼,停下来又没了。因为这样,所以我就把它退了。
W****i
发帖数: 1314
46
冬天潮汐河,要么就没鱼,要么就很多,非常多。成千上万。
但是即使坐在鱼群上,上鱼也不快,需要比较精确的presentation。所以每条鱼咬钩的
几率算下来应该是很低的。
我的FF是humminbird 385ci,没有side scan。side scan很好,但是要transduce必须装
水里,kayak上不是很方便。
L*****2
发帖数: 66
47
来自主题: Fishing版 - 在seaeagle 上装fishfinder
定的 seaeagle 8 和 fishfinder 都到了,琢磨着把fishfinder 和 transducer 装在
哪和怎末装。鱼版的朋友能指点一下吗?
h**********i
发帖数: 587
48

老大,http://www.brantpointmarine.com/boats/seaprofolder/seapro235cc.html
这是我那船的官方图貌似。只能钓鱼,干别的坑爹。还没trolling motor回头我还准备
配一个。刚换了个garmin6212 的chartplotter。还得让码头给安新的transducer,估
计又得墨迹老半天。秋天我准备把船搞到crisfield那边。到时候striper好钓,就是大
的不多,一天100条不是问题。
W*******s
发帖数: 18705
49
卡娅上用这个显得大了。4-5寸就可以了,各种牌子的看看,Side Image对卡娅来说是
否重要不清楚,2D声纳为主,注意Screen Resolution,买最高清的。Transducer一般
是Transom船尾用的,你把这个寄回厂家换Trolling Motor上用的,二个是不同的样子
。干扰的问题基本没有,但是,要用二个电磁,TM+Sonar共享一个电磁就会有问题。
Sonar的电磁可以买小块的Portable,一般用一,二天没问题。
u******w
发帖数: 1882
50
我就是觉得屏幕大看得清楚哈,分辨率也高,只要imaging功能上过硬就行。
我搜了一下,还真有trolling motor mount transducer啊,这个相当于一体式就方便
多了!反正我也打算再弄块儿备用电池,否则一块电池没了还得靠人力划回来。
首页 上页 1 2 3 4 下页 末页 (共4页)