加拿大外贸
1.We measure the sound pressure with a standard white noise.
2.The measurement is weighted in dBA.
3.The microphone goes directly between the ear cups so that we can simulate the sound pressure on the ear.
Please send us another sample with the dB level at no more than 85dB. So aim for a level of 82dB ± 3.
之前的客户邮件回复说
We tested for many different things on these headphones for kids. To find the frequency curve, we use a real-time audio (RTA) spectrum analyzer, as well as a uni-directional condenser microphone. We use a dB meter against the ear cups to find the peak dB. We also test with white noise as well as high and low frequencies with the dB meter.
We just need the headphones to peak at 85dB because that is the required dB level that headphones can be when selling to children.
请问谁用过a real-time audio (RTA) spectrum analyzer吗？ 客户也在用这个软件IPad 里下载的．
谢谢
评论
不是很清楚哎 不好意思
加拿大电商刚从事这行半年，对电子行业不了解，自己整理了些，算是学习，供大家分享，也请大家补充。我毕竟是个文科生，对这方面知识严重欠缺。 DVD:英文全名是Digital Video Disk, 即数字视频光 加拿大电商昨天我把提单复件发给了客户，今天收到了他回信，如下： Dear Nicholas, please send all shipping documents. We will check B/L copy and we will reply ASAP. Thank you Best Regards .........................................
·中文新闻 澳大利亚致命热浪和雷暴双重天气警告
·中文新闻 传奇足球硬汉马克·卡罗尔表示，他对 NRL 巨星里斯·沃尔什涂指