Solve the problem of sound noise in Windows7

In WinXP to see high-definition movies, the screen smooth, sound quality is good, but upgrade to Win7, may appear despite the picture does not card, but there is a burst of sound, murmur phenomenon, and upgrade the driver, replace the video player. Because it is normal under WinXP, you can troubleshoot a hardware problem, and even if the upgrade driver has a beep or murmur, there is no driver compatibility issue.

In the Win7 system, Microsoft has given higher priority to multimedia playback files, trying to optimize multimedia (playback) Performance by controlling the CPU, which can optimize HD performance. But for netbooks or lower-profile savings, it can have negative effects, such as a false panic at higher CPU usage or a loud or noisy sound when playing high-definition video.

The solution is to cancel the priority of Win7 video playback by going to Registry Editor, expanding to Hkey_local_machinesystemcurrentcontrolsetservicesaudiosrv, and double-clicking on the right window. DependOnService name, and then delete the "mmcss" value in the dialog box.

Exit Registry Editor, enter "Msconfig" in the Start Menu "Search Programs and Files" box, and switch to the Services tab to locate and cancel the "Multi Media Class Scheduler" service item.

When you click the Apply button, restart your notebook, and then play the HD movie again, there is no longer a problem of slow sound.

Note: Multi Media class Scheduler This service I personally think the simple explanation is: Multimedia Classes Scheduler service (MMCSS) allows multimedia applications to get as much CPU time as possible.

To emphasize, this article is called "Burst sound", "murmur" is not refers to the playback of high-quality MP3 file when the problem arises. However, when playing high quality MP3 files, you can try the same method to solve the problems that occur when you play HD movies.