Skip to main content

再谈声卡识别但不出声的问题

上次在一个关于声卡识别的问题提到了一个关于声卡在设备管理器中能够识别， 但是声音选项中缺说找不到音频设备的问题。

我转的解法是用Plug and Play Software Device Enumerator替换一个已有设备ISAPNP Read Data Port。起初我认为是识别有误，

但后来感到有些不对劲， 觉得那本身是一个正常的系统设备。 虽然能正常工作， 但毕竟不是完美解决方案。 后来再次尝试了上次

也提到的重装Plug and Play Software Device Enumerator的方法：

1.假设windows装在c:\windows下， 将c:\windows\inf\machine.inf, c:\windows\system32\streamci.dll, c:\windows\system32

\drivers\swenum.sys拷到一个临时目录下

2.修改machine.inf，找到[ControlFlags], 把下面一行ExcludeFromSelect=*删去

3.如果现在设备管理器中有Plug and Play Software Device Enumerator， 那么用现在的临时目录给它更新驱动即可，否则依次进

入控制面板->添加硬件， 几次"下一步"后依次选"添加新的硬件设备"，"安装我手动从列表选择的硬件"，"显示所有设备"，"从磁盘

安装", 此时选那个目录， 然后厂商选"(标准系统设备)"， 型号选"Plug and Play Software Device Enumerator", 然后安装便可

。

最后还查到一个解法， 是说在注册表中删除所有swenum的相关项， 然后就能自动识别Plug and Play Software Device Enumerator

了， 不过这个没试过， 不知是否真的可行。
Labels:

Comments

Post a Comment

Popular posts from this blog

Determine Perspective Lines With Off-page Vanishing Point

In perspective drawing, a vanishing point represents a group of parallel lines, in other words, a direction. For any point on the paper, if we want a line towards the same direction (in the 3d space), we simply draw a line through it and the vanishing point. But sometimes the vanishing point is too far away, such that it is outside the paper/canvas. In this example, we have a point P and two perspective lines L1 and L2. The vanishing point VP is naturally the intersection of L1 and L2. The task is to draw a line through P and VP, without having VP on the paper. I am aware of a few traditional solutions: 1. Use extra pieces of paper such that we can extend L1 and L2 until we see VP. 2. Draw everything in a smaller scale, such that we can see both P and VP on the paper. Draw the line and scale everything back. 3. Draw a perspective grid using the Brewer Method. #1 and #2 might be quite practical. #3 may not guarantee a solution, unless we can measure distances/p...
2 comments
Read More »

[转] UTF-8 and Unicode FAQ for Unix/Linux

这几天,这个东西把我搞得很头疼 而且这篇文章好像太大了,blogger自己的发布系统不能发 只好用mail了 //原文 http://www.cl.cam.ac.uk/~mgk25/unicode.html UTF-8 and Unicode FAQ for Unix/Linux by Markus Kuhn This text is a very comprehensive one-stop information resource on how you can use Unicode/UTF-8 on POSIX systems (Linux, Unix). You will find here both introductory information for every user, as well as detailed references for the experienced developer. Unicode has started to replace ASCII, ISO 8859 and EUC at all levels. It enables users to handle not only practically any script and language used on this planet, it also supports a comprehensive set of mathematical and technical symbols to simplify scientific information exchange. With the UTF-8 encoding, Unicode can be used in a convenient and backwards compatible way in environments that were designed entirely around ASCII, like Unix. UTF-8 is the way in which Unicode is used under Unix, Linux, and similar systems. It is now time to make sure that you are well familiar ...
Post a Comment
Read More »

Moving Items Along Bezier Curves with CSS Animation (Part 2: Time Warp)

This is a follow-up of my earlier article.  I realized that there is another way of achieving the same effect. This article has lots of nice examples and explanations, the basic idea is to make very simple @keyframe rules, usually just a linear movement, then use timing function to distort the time, such that the motion path becomes the desired curve. I'd like to call it the "time warp" hack. Demo See the Pen Interactive cubic Bezier curve + CSS animation by Lu Wang ( @coolwanglu ) on CodePen . How does it work? Recall that a cubic Bezier curve is defined by this formula : \[B(t) = (1-t)^3P_0+3(1-t)^2tP_1+3(1-t)t^2P_2+t^3P_3,\ 0 \le t \le 1.\] In the 2D case, \(B(t)\) has two coordinates, \(x(t)\) and \(y(t)\). Define \(x_i\) to the be x coordinate of \(P_i\), then we have: \[x(t) = (1-t)^3x_0+3(1-t)^2tx_1+3(1-t)t^2x_2+t^3x_3,\ 0 \le t \le 1.\] So, for our animated element, we want to make sure that the x coordiante (i.e. the "left" CSS property) is \(...
3 comments
Read More »