美国国家半导体针对便携式及消费电子应用的高性能音频解决方案National Semiconductor

简介：这次研讨会主要从便携式系统应用，便携式DVD、LCD显示器应用，高端LCD显示器应用的方面介绍了使用者的经验以及美国国家半导体的一些参赛可选器件。方便各位参赛者的选用。

问：程先生是否注意到了不久前TI推出的TPA6120A2、OPA4134 国半是否有产品与其相当，请做比较分析
答： I think customer can access our website and download the datasheet, then you can have everything you want.

问：一般来说，在便携式电脑中，由于体积的问题导致音频方面总是存在这样那样的缺陷。那么，我们如何才能使便携式电脑中的播放的声音效果更好，音频技术更为完善呢？
答： Suggest our Boomer product with 3D effect

问：便携式及消费电子中的音频部分主要干扰源有哪些？清除干扰源的主要方法有哪些？
谢谢！
答： High frequency noise, which is come from the MPU operation, slove this issue is separate the digital & analog part by using the PCB layout.

问：如果用LM4809实现LM4889，该注意哪些事项？
谢谢
答： Actually the LM4889 & LM4890 is a pin-to-pin comparable part, only the LM4890 has better THD & PSRR.

问：请问音频解决方案是否包括软件解决方案？
有没有一种合适的互联网上高性能实时音频传输方案？

答： The audio solution not included the software. Depand on the CODEC quality.

问：我比较关心无线数字系统.无线数字家庭影院和传统的有线式优势在哪,劣势和将来的技术发展.
答： Wireless can give a more flexible placement for the end user and this is also the home audio system trend.
It is no need to place and install on the speaker wire. it bring convenient to user.
The sound quality will be depends on any interference a

问：将贵司的音频产品应用到无线公话中须注意到哪些细节？
答： For the GSM application, the maily concern is the PSRR, especialy in 217Hz. The second concern is turn-on time & click pop performance. Surround components also is part of concern.

问：How do you think about class D amplifier
答： it do have some advantage like higher efficiency, need heatsink, but designer should be careful for handling the EMI,noise

问：How to solve S/N question ?
答： We should has a specified S/N for the IC on certain condition.
Of course,for the systematic view., it will also depend on the PCB designing,you can concentrate on the supply trace and the in/out signal path etc.

问：请问美半在LCD电视、高端LCD显示器上具体做了那些应用。那部分采用美半的方案，将提高了产品质量，又保持价格优势？
答： For the LCD appliaction , we did some of soultion kit to customers for a reference, (LM4832 + LM4755, LM4832 + LM4866, LM4832+LM4950, LM4832 + 2.1 channel amplifier). This kind of solution can help our customer to speed up their audio design cycle & im