Sony PCG-F640 Manual

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Connecting an External Microphone
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Connecting an External Microphone
You can enhance the quality of sound input by using an external microphone. 
To connect an external microphone
Use the 
to locate the Microphone connector. Plug the microphone 
cable into this connector.
Make sure your microphone is designed for computer use. The microphone should be 
compliant with the plug-in power microphone.
Connecting a microphone to microphone connector
See the manual that came with your microphone for more information on installation 
and use.
Microphone
to Microphone
(optional)