请教关于电声测试——DECT无绳电话 RLR SLR 测试

jachu

有那位大虾有这方面的资料吗,请指点

jachu

没有回音啊，我还是说清楚一点吧，问题是这样的通过RS232发送一个COMMAND 给DECT 无绳电话，接着电话发出6个不同的frequency需要跟据这些点测试无绳电话的RLR 和SLR.我找到ITU-T中RLR SLR的计算公式如下：
2 General algorithm for loudness rating calculations
The general algorithm for calculation of Loudness Ratings, LRs, is of the form:
LR = –
ïþ
ïý ü
ïî
ïí ì
å=
- 2
1
•log 100.1•m( )
m
10 N
i N
Si Wi (2-1)
where
m = a constant (in the order of 0.2).
The summation is to be performed at frequencies Fi, spaced 1/3 octave apart.
Wi = weighting coefficient (different for the various LRs).
Si = the sensitivity at frequency Fi of the electro-acoustic path under consideration.
NOTES
1 Si is to be determined by the methods described in Recommendations P.64 and P.65 for analogue 2-wire handsets.
Digital sets are measured according to 6/P.66 and hands-free sets according to 6/P.34.
2 One can also use the designation “electro-acoustic loss” Li = –Si.
3 When calculating SLR and RLR, one must only include those parts of the frequency band where an actual signal
transmission can occur in order to ensure that the additivity property of LRs is retained. Therefore, only the frequency band
200-4000 Hz is used.

P.64中Sje如下：
The sending sensitivity of a local telephone system at a specified frequency or in a narrow frequency
band is expressed as follows:
20 log10 dB rel 1 V/Pa
p
V
S
m
J
mJ =
where VJ is the voltage across a 600 ohm termination and pm is the sound pressure at the mouth
reference point. Note that pm must be measured in the absence of the "unknown" handset of the test
item.

对于sending sensitivity Sje上面所是一种，我还看到另一众说法就是SFR，想知道具体应该怎么算啊！！非常感激

jachu

帮忙啊兄弟!
有没有用LABVIEW做过电声测试的啊,测量声压级时如何分析啊

cenfan

先对程序作校准，再做1/3倍频程分析

jarquine

不要指望高人出现，:call: NI

SoundDesign

可使用HEAD acoustics 公司的ACQUA软件系统，专测各种通讯终端的语音品质。包括DECT

jachu

请教Lab view 中如何测量Broad noise Frequence band 100-4000 是所有频点的累加还是?
Lab view 有这样的子VI

[ 本帖最后由 jachu 于 2007-11-5 18:09 编辑 ]

cenfan

直接调用sound and vibration toolkit的子VI，可以完成你要求的所有测试

DHJ1314

咨询：测量耳机声压原理方法（急！！！！）


各位，

请问如何测量耳机Headset声压sound level的简单原理或测试方法呢？？
We would like to design testing methodology to investigate the following items:
1) sound level of the headset during communication
2) sound level received from the headset during communication

JasonChen

Jachu，你有相关测试仪器吗？我推荐一款Malden公司的DSLA测试仪器。对你理解这方面应该很有帮助。

wlh5307

原帖由 DHJ1314 于 2007-12-18 09:41 发表

                               
登录/注册后可看大图

咨询：测量耳机声压原理方法（急！！！！）


各位，

请问如何测量耳机Headset声压sound level的简单原理或测试方法呢？？
We would like to design testing methodology to investigate the following items ...

电声测试还是用B&K吧.

zw1235

B&K枪手。。。不要向每个人都推荐高射炮，也许他需要的仅仅是打个蚊子的东西。

B&K的东西是不错，但是价格超级贵，楼主不妨搜索一下国产电话电声测试仪

wlh5307

原帖由 zw1235 于 2008-9-25 14:29 发表

                               
登录/注册后可看大图

B&K枪手。。。不要向每个人都推荐高射炮，也许他需要的仅仅是打个蚊子的东西。

B&K的东西是不错，但是价格超级贵，楼主不妨搜索一下国产电话电声测试仪

楼上的说话真不中听.楼主问问题,那么多人回答并且给楼主建议都没什么情况,我一提建议就是"枪手"?希望你不要拿进口的和国产的来说事,更不要上升到用进口的就是不爱国的高度.关键还是看用户的测试要求.至于你说的价格问题,只说一句,你不可能花奇瑞车的钱买来宝马开.天下有这种好事吗?
我想你肯定是某个国产品牌的"枪手",想来这里找客户可以,介绍你自己的东西就足够了!!!恕我直言,整天说别人的东西不好来抬高自己的人,他的人品和产品都是垃圾.