Latency occurs when you listen to a Line-in recording during the recording process in Windows 7

Symptoms

When you record sound input from the Line-in source on a Windows 7-based computer, you may find a one-half to one-second delay when you listen through the speakers to the sound during the recording process.

Consider the following scenario. You are a musician. You plug headphones into the computer and listen to music. Then, you plug a guitar into the microphone jack and enable the microphone sound output so that you can play along with the music. In this case, the computer acts as a mixer. However, on a Windows 7-based computer, the microphone sound (mic in) output has a one-half to one-second delay. 

Cause

This issue is caused by incompatibilities in hardware drivers. Not all drivers expose the hardware loopback. Additionally, since the release of Windows Vista and Windows 7, some Independent Hardware Vendor (IHV) drivers no longer expose the hardware loopback.

Resolution

To resolve this issue, please contact your sound card vendor to update to the latest driver version or to request the addition of this hardware loopback option to the driver.

More Information

If you have an audio driver and codec that exposes the hardware loopback, the hardware loopback is available on the Levels tab of the Speakers device. If you had this option when you used Windows XP, try installing the Windows XP driver in Windows 7.

For the stereo mixer, if the audio driver is exposed, the stereo mixer is available. By default, the stereo mixer is hidden on Windows Vista and on Windows 7. To enable the stereo mixer, right-click in an open area on the Recording tab of the Speakers device, click Show Disabled Devices, right-click Stereo Mix, and then click Enable.
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文書番号:2462986 - 最終更新日: 2011/08/16 - リビジョン: 1

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